WHITBY
Professional Engineering, Design & Building Permit Solutions
Engineering & Building Permit Services in Whitby
Deltoid Consulting provides professional engineering, architectural design, and building permit services for residential, commercial, industrial, and institutional projects throughout Whitby, Brooklin, and surrounding communities in Durham Region.
Our multidisciplinary team assists homeowners, property owners, contractors, developers, and businesses with projects ranging from home renovations, load-bearing wall alterations, additions, additional dwelling units, basement entrances, custom homes, decks, garages, sheds, and other accessory structures to restaurants, offices, medical and dental clinics, retail spaces, industrial buildings, and institutional improvements.Our services can include architectural design, structural engineering, HVAC and plumbing design, electrical engineering, grading and site engineering, permit drawings, zoning review, municipal submission coordination, and responses to technical review comments. Depending on the property and scope, approvals may also involve the Town of Whitby Planning and Development Department, Whitby Engineering Services, the Region of Durham, Central Lake Ontario Conservation Authority (CLOCA), Whitby Heritage, the Electrical Safety Authority, or other reviewing agencies.
Engineering & Building Permit Services We Provide in Whitby
We provide coordinated architectural and engineering services for a wide range of residential and non-residential projects throughout Whitby and Durham Region.
Architectural & Building Design
Design drawings for renovations, additions, custom homes, additional dwelling units, below-grade entrances, accessory structures, commercial alterations, changes of use, and other building projects.
Structural Engineering
Structural design for foundations, framing, beams, columns, load-bearing wall alterations, basement entrances, additions, retaining walls, underpinning, equipment support, and other structural modifications.
Building Permit Services
Preparation and coordination of permit drawings, forms, calculations, professional documents, and supporting information for submission to the Town of Whitby.
Civil & Site Engineering
Grading plans, lot-drainage design, proposed elevations, site servicing, storm drainage, erosion and sediment control, and Grading, Servicing and Drainage Permit documentation where required.
Mechanical & Electrical Engineering
HVAC, plumbing, and electrical design and coordination for residential, restaurant, office, clinic, retail, industrial, and institutional projects.
Planning & Development Approvals
Assistance with zoning reviews, minor variances, Committee of Adjustment applications, site plan matters, planning inquiries, and other municipal approvals where applicable.
Engineering Reports & Assessments
Engineering inspections, assessments, reports, and supporting documentation for existing buildings, structural alterations, renovations, and proposed construction.
Common Projects We Assist With in Whitby
Our services support residential, commercial, industrial, and institutional projects throughout Whitby, from interior renovations and structural modifications to new construction, infill development, grading, servicing, and changes of use.
- Home Renovations & Interior Alterations – architectural and engineering design for renovations, basement finishing, wall changes, plumbing modifications, and building-system alterations.
- Load-Bearing Wall Removal – structural assessment and design of beams, posts, columns, connections, foundations, and temporary shoring where required.
- Home Additions & Second-Storey Additions – coordinated architectural, structural, HVAC, grading, and permit drawings for additions and expanded living space.
- Additional Dwelling Units – design for additional residential units within principal dwellings or qualifying accessory structures, including structural, fire-safety, HVAC, plumbing, zoning, access, and servicing considerations.
- Below-Grade Entrances & Walk-Outs – structural and site design for basement entrances, foundation openings, stairs, retaining walls, drainage, grading, and waterproofing.
- Custom Homes & Replacement Dwellings – architectural, structural, mechanical, electrical, grading, servicing, and permit coordination for new residential construction.
- Decks, Garages, Sheds, Cabanas & Accessory Structures – zoning review, site planning, structural design, foundations, framing, stairs, guards, and attachment details.
- Restaurants, Offices, Clinics & Retail Spaces – multidisciplinary permit drawings for tenant improvements, interior renovations, changes of use, accessibility, mechanical and electrical work, and life-safety modifications.
- Industrial & Institutional Projects – architectural and engineering design for additions, alterations, equipment, site servicing, structural modifications, and building-system changes.
- Grading, Drainage & Site Servicing – grading and servicing plans, stormwater considerations, proposed elevations, and coordination with Town and Durham Region requirements.
Whitby Building Permits: Typical projects requiring a building permit include new homes, additions, decks more than 0.6 m above grade, porches, sunrooms, finished basements, garages, plumbing and heating work, structural alterations, basement or main-floor walkouts, additional dwelling units, changes of use, and industrial, commercial, and institutional construction or interior fit-outs.
Featured Engineering & Design Projects in Whitby
These Whitby projects show how Deltoid Consulting coordinated design for a bungalow addition and a restaurant expansion.
23 Ferguson Avenue
Architectural, structural and HVAC design for a second-storey addition, rear extension and basement upgrade to a Whitby bungalow.
View Project →
Shaaz Indian Cuisine
Architectural and engineering design for an expansion on Dundas Street East that combined two units and reconfigured the dining area and commercial kitchen.
View Project →
Whitby Zoning, Official Plan & Property Review
Zoning should be reviewed early because permitted uses, setbacks, lot coverage, building height, parking, accessory structures, additional dwelling units, special exceptions, and property-specific provisions can directly affect a proposed project.
Whitby Zoning By-laws: The Town currently administers three principal zoning by-laws: Zoning By-law 2585 for Downtown Whitby, Zoning By-law 1784 for the former Township of Whitby, and Zoning By-law 5581-05 for the Oak Ridges Moraine. The applicable by-law, zoning map, amendments, and property-specific provisions should be confirmed before design is finalized.
Whitby Zoning
Access the Town’s zoning information, current consolidated zoning by-laws, additional dwelling unit amendments, zoning review information, and property inquiry resources.
Whitby Zoning Map / GeoHub
Use the Town’s interactive mapping resources to help identify zoning and other geographic information associated with a property.
Whitby Official Plan
Review the Town’s current Official Plan consolidation, maps, schedules, and policy direction for growth, land use, and development.
Submit a Planning Inquiry
Request property-specific planning information from the Town before proceeding with design or a formal planning application.
Committee of Adjustment
Review Whitby’s minor variance and consent process when relief from zoning requirements or land division approval may be required.
Comprehensive Zoning By-law Review
Review the Town’s ongoing work to modernize and consolidate its zoning framework.
If a proposed development does not comply with one or more zoning standards, relief through the Committee of Adjustment may be appropriate. If the proposed use or development requires a broader change to the zoning framework, a Zoning By-law Amendment may be required. Official Plan conformity should also be reviewed for planning applications and larger development proposals.
Additional Dwelling Units, Basement Apartments & Garden Suites in Whitby
Whitby has expanded permissions for additional dwelling units (ADUs). Current zoning provisions can permit up to three additional dwelling units on qualifying parcels of urban residential land, for a total of four residential units, subject to the applicable zoning by-law, building type, access, parking, servicing, hazard-land restrictions, Ontario Building Code requirements, and other property-specific conditions.
Whitby Additional Dwelling Units
Review Town information regarding ADUs, zoning amendments, application requirements, registration, and available municipal programs.
Whitby Online Application Portal
Access the Town’s E-Portal for eligible residential building permit and planning submissions.
Structural Design for ADUs
New entrances, enlarged openings, beams, posts, foundation modifications, detached ADU structures, and other structural changes may require professional engineering.
HVAC, Plumbing & Electrical Design
Additional dwelling units can require coordinated heating, ventilation, plumbing, electrical, alarm, and other building-system design.
Whitby ADU Zoning: Current zoning amendments generally allow a maximum of two additional dwelling units within a qualifying principal dwelling plus one within an accessory structure, or up to three additional dwelling units within the principal dwelling where no ADU is located in an accessory structure. Different limitations apply outside the urban area, in the Oak Ridges Moraine, Greenbelt and hazard or environmentally sensitive areas. Property-specific zoning and servicing should be confirmed before design.
Deltoid Consulting can assist with architectural layouts, structural design, HVAC, plumbing, electrical design, zoning review, permit drawings, and municipal submission coordination for basement apartments, secondary suites, detached ADUs, garage suites, and garden-suite type projects where permitted.
Below-Grade Entrances, Basement Renovations & Structural Alterations
A below-grade entrance or basement walk-out can affect the foundation, zoning setbacks, drainage, retaining walls, stairs, guards, waterproofing, and structural support of the existing building. These matters should be coordinated before construction begins.
Whitby Building Permit Requirements
Review the Town’s current permit requirements and documentation for residential alterations, finished basements, below-grade entrances, structural work, and other projects.
Load-Bearing Wall Removal
Structural design may include a new beam, posts or columns, connections, bearing details, foundations, and temporary shoring requirements.
Foundation Openings & Walk-Outs
Engineering review can address foundation-wall openings, lintels or beams, retaining walls, stair construction, frost protection, and structural support around new basement entrances.
Drainage & Grading Coordination
Below-grade construction should address surface drainage, waterproofing, foundation drainage, retaining walls, adjacent grades, and potential impacts on neighbouring properties.
Professional Structural Information: Whitby’s building-permit documentation requirements identify structural drawings and engineered information as applicable technical documents. Below-grade entrance projects can require engineered structural design depending on the proposed foundation and framing modifications.
Home Additions, Decks, Garages, Sheds & Accessory Structures
Residential additions and accessory structures should be reviewed for zoning, structural design, foundations, grading, drainage, mechanical systems, and building-permit requirements before construction.
Home & Second-Storey Additions
Architectural and engineering services can address zoning, floor plans, elevations, structural framing, foundations, HVAC, energy requirements, grading, drainage, and permit documentation.
Decks & Fences
Whitby requires a building permit for decks more than 0.6 m above grade. Zoning, setbacks, foundations, guards, stairs, and structural framing should be reviewed for the proposed deck.
Accessory Structures
Review Town requirements for sheds, detached garages, gazebos, pool houses, and other accessory structures, including zoning and building-permit thresholds.
Existing Building Capacity
Second-storey additions and major additions may require assessment of the existing framing, bearing walls, beams, posts, and foundations for the proposed additional loads.
Accessory Structure Permit Thresholds: Whitby states that an accessory structure other than a shed generally requires a building permit when it is larger than 10 m². A shed accessory to a dwelling generally requires a permit when it is larger than 15 m² and/or more than one storey. Zoning requirements still apply even where a building permit is not required.
Infill Development, Grading, Servicing & Drainage in Whitby
Whitby has a specific Grading, Servicing and Drainage Permit process for applicable infill development. This makes early coordination of grading, servicing, drainage, earthworks, construction access, and municipal requirements particularly important for replacement dwellings, infill homes, additions, and other qualifying projects.
Whitby Infill Development & GSDP
Review the Town’s Grading, Servicing and Drainage Permit process, including pre-screening and circumstances where a GSDP permit is required before a building permit.
Grading & Lot Drainage Design
Site engineering can address proposed elevations, swales, drainage directions, retaining walls, driveway grades, foundation elevations, and impacts on neighbouring properties.
Site Servicing
Water, sanitary, and storm servicing should be coordinated with existing infrastructure, Region of Durham requirements, Town standards, and site conditions.
Construction & Earthworks Coordination
Applicable infill review can address excavation, import or export of fill, drainage during construction, use of public roadways, erosion and sediment control, and protection of municipal infrastructure.
GSDP Before Building Permit: For applicable infill development, the Town states that a Grading, Servicing and Drainage Permit is typically required before applying for a building permit. A pre-screening questionnaire is used to determine whether the project requires a GSDP permit.
New Homes & Residential Building Permits in Whitby
New residential construction requires coordination among architectural design, structural engineering, mechanical systems, energy efficiency, zoning, municipal servicing, grading, drainage, and other applicable approvals.
Residential Building Permits
Whitby’s permit requirements identify architectural drawings, applicable-law documentation and, where required, structural, engineered floor or roof, HVAC, grading, CLOCA, septic, GSDP, and general-review documents.
Residential E-Portal
Eligible residential permit applications can be submitted electronically through Whitby’s E-Portal.
Pre-Approved Model Submission Guide
Builders can review the Town’s requirements for eligible Pre-Approved Model submissions through the E-Portal.
Coordinated Residential Design
Deltoid Consulting can coordinate architectural, structural, HVAC, plumbing, electrical, grading, servicing, and permit documentation according to the project scope.
Commercial, Industrial & Institutional Projects in Whitby
Non-residential projects may require coordinated architectural, structural, mechanical, plumbing, electrical, fire-protection, accessibility, zoning, and life-safety submissions depending on the occupancy, building size, and scope of work.
Restaurants & Food-Service Spaces
Design may include kitchens, exhaust and makeup air, plumbing, electrical systems, accessibility, fire-protection changes, grease-management requirements, and Durham Region Health coordination where applicable.
Medical & Dental Clinics
Coordinated layouts and building-system design may be required for treatment rooms, equipment, plumbing, ventilation, electrical loads, accessibility, life safety, and X-ray equipment approvals where applicable.
Retail & Office Renovations
Permit drawings can address partitions, washrooms, accessibility, HVAC, electrical work, exits, fire separations, signage, and fire-protection modifications.
Industrial Buildings & Units
Engineering may include additions, structural modifications, equipment support, mezzanines, tenant improvements, site servicing, and changes to building systems.
Institutional Projects
Schools, assembly spaces, community facilities, and similar occupancies can require coordinated architectural, structural, mechanical, electrical, accessibility, and life-safety design.
ICI Permit Information
Whitby identifies commercial, industrial, institutional, and mid/high-rise residential applications within its building-permit submission framework.
Change of Use: A change in the use or occupancy of a building, unit, or room can trigger zoning and Ontario Building Code review even where construction is limited. Occupant load, exits, fire separations, accessibility, plumbing fixtures, ventilation, and fire-protection systems should be reviewed before a lease or construction commitment is finalized.
Planning, Minor Variances & Site Plan Approval
Some Whitby projects require approvals under the Planning Act in addition to a building permit. The required planning path depends on the property, proposed use, scale of development, servicing, site modifications, and applicable municipal policies.
Planning Pre-Consultation
Whitby requests pre-consultation before applications such as Official Plan Amendments, Zoning By-law Amendments, draft plans of subdivision, and Site Plan Approval. The Town uses a staged pre-consultation process.
Minor Variances & Consents
The Committee of Adjustment reviews minor variance applications and processes consent or land-severance matters.
Site Plan Approval
Applicable development may require site plan approval addressing building placement, access, parking, landscaping, lighting, grading, drainage, servicing, waste storage, emergency access, and other site matters.
Planning Inquiry
Use the Town’s planning inquiry form to request property-specific planning information before advancing a design or application.
Zoning By-law Amendments
Where the proposed use or development is not permitted by existing zoning, a Zoning By-law Amendment may be required following the applicable planning process.
Official Plan Amendments
Where a proposal does not conform to the Town’s Official Plan, an Official Plan Amendment may be required in addition to other planning approvals.
Site Plan and Building Permit: The Town states that where Site Plan Approval applies, a building permit will not be issued and development cannot proceed until the required site plan has been approved.
Heritage Properties & Heritage Permits in Whitby
Whitby has two established Heritage Conservation Districts: the Brooklin Heritage Conservation District in Downtown Brooklin and the Werden’s Plan Neighbourhood Heritage Conservation District in Downtown Whitby. The Town also maintains a register of individually designated and other listed heritage properties. Renovations, additions, exterior alterations, and other work affecting designated properties may require heritage review and a Heritage Permit in addition to the applicable building, zoning, or planning approvals.
For work in either district, a useful early design step is to review the district plan and property-specific heritage attributes before selecting new windows, exterior cladding, additions, storefront features, or other visible changes. The Town adopted updates to both district plans in April 2026. See the Whitby Heritage Conservation District plans and Heritage Permit guidance.
Whitby Heritage Permits
Review when a Heritage Permit is required and the documentation that may need to accompany an application.
Architectural Drawings for Heritage Work
Drawings can document existing conditions and clearly identify proposed alterations, additions, exterior changes, or other work affecting a designated property.
Site Planning & Additions
Heritage submissions may require site plans showing existing and proposed structures, setbacks, additions, demolition, and the relationship of proposed work to the property.
Coordinated Approval Strategy
Heritage approval should be coordinated with zoning, Committee of Adjustment, site plan, CLOCA, and building-permit requirements where more than one approval applies.
CLOCA, Durham Region & Other Approvals
A Town of Whitby building permit may not be the only approval required. Conservation regulation, Regional water and sewer infrastructure, private sewage systems, electrical work, heritage, roads, and other Applicable Law requirements can involve separate authorities.
Central Lake Ontario Conservation Authority
Projects in or near regulated valleys, streams, wetlands, floodplains, erosion hazards, shorelines, or other regulated areas may require CLOCA review or a development permit.
Durham Region Water & Sewer
New or modified connections to Regional water and sanitary sewer infrastructure may require Region of Durham permits, fees, servicing review, and coordination.
Private Sewage / Septic Systems
Durham Region Health Department is responsible for private sewage-system approvals in Whitby. Building additions and site changes can also require septic review where private services are present.
Electrical Safety Authority
A municipal building permit does not replace an electrical notification or inspection that may be required by the Electrical Safety Authority.
CLOCA Planning Services
Review CLOCA planning, natural-hazard, watershed, and regulatory services for development proposals.
CLOCA Regulated Areas Map
Use CLOCA’s mapping tool as an initial screening resource for properties that may fall within a regulated area.
Durham Water & Sewer Connection Permits
Review Region of Durham requirements for new or modified connections to Regional water and sewer systems.
Durham Septic Systems
Review permit, design, inspection, record-search, and building-addition requirements for properties using private sewage systems.
CLOCA Screening: CLOCA advises that construction of new or enlarged structures, additional dwelling units or uses, placement of fill, alteration of grades, activities near streams, or activities that may interfere with wetlands can require a permit under Ontario Regulation 41/24. Property-specific confirmation should be obtained before construction or site alteration.
Professional Engineering, General Review & Permit Documentation
The level of professional involvement depends on the building, occupancy, size, complexity, and proposed work. Certain projects require design or general review by a professional engineer, architect, or both.
Commitment to General Review
Whitby’s building-permit requirements identify a Commitment to General Review by Architects and Engineers as a document that may be required depending on the project.
Engineering Design
Professional engineering may be required for structural elements, foundations, retaining walls, mechanical systems, electrical systems, civil works, site servicing, grading, and other regulated components.
General Review During Construction
Where required and included in the consultant’s scope, periodic field review is carried out to assess general conformity of the applicable work with the permit documents.
Shop Drawings & Design Changes
Project-specific professional services may include review of delegated-design information, shop drawings, field conditions, technical substitutions, or design changes within the consultant’s discipline.
What to send us for an initial Whitby project review
- Adding a second storey or rear extension? Send the property address, an available survey or site plan, photos of the house and basement framing, and a sketch showing where you want to build. Note any walls you want to remove and any known foundation alterations.
- Renovating or expanding a commercial unit? Send the address and unit number, the current and proposed uses, any landlord or base-building drawings, and a sketch of the intended layout. For a restaurant, include the proposed cooking equipment and any information on the existing exhaust, plumbing and electrical service.
We can use this information to identify what needs to be verified on site and what drawings or reviews may be needed before you apply. Check the Town’s guidance for approvals that may apply to your property. Town of Whitby building permit guidance
Whitby Building Permit Application Process
A well-prepared permit application begins with zoning and project review before drawings are finalized. Whitby accepts many residential permit types through its E-Portal, while other applications use the Town’s current electronic submission procedures.
1
Review the Project & Existing Property
Review the proposed work, existing building and site conditions, survey information, available records, project objectives, and general architectural and engineering requirements.
2
Complete a Zoning & Official Plan Review
Identify the applicable zoning by-law and zone, then review permitted uses, setbacks, lot coverage, height, parking, accessory structures, additional dwelling-unit provisions, exceptions, and other property-specific regulations.
3
Identify Other Required Approvals
Determine whether the proposal requires a minor variance, site plan approval, GSDP permit, heritage permit, CLOCA approval, Durham Region servicing or septic approval, ESA notification, or another Applicable Law clearance.
4
Prepare Architectural & Engineering Drawings
Prepare and coordinate the applicable architectural, structural, HVAC, plumbing, electrical, grading, drainage, servicing, energy-efficiency, and other technical documents.
5
Prepare Forms & Supporting Documents
Coordinate the permit application, Schedule 1 designer information, Applicable Law checklist, authorization, professional commitments, calculations, surveys, approvals, and other project-specific documents.
6
Submit the Permit Application
Eligible residential applications can be submitted through the Whitby E-Portal. Other applications should follow the Town’s current submission route and electronic submission standards.
7
Municipal Review
Town staff review the submission for zoning, applicable law, Ontario Building Code compliance, and completeness. Other Town divisions or agencies may also review the project where required.
8
Respond to Review Comments
Where comments relate to our professional scope, we can revise applicable drawings, calculations, and supporting documents and coordinate the technical response for resubmission.
9
Permit Issuance & Inspections
Outstanding fees and applicable approvals must be addressed before permit issuance. During construction, required municipal inspections and professional general reviews should be coordinated as applicable.
Electronic Submission: Whitby’s E-Portal accepts many residential permit types, including residential alterations and additions, finished basements, below-grade entrances, decks, accessory structures, and additional dwelling units. Commercial, industrial, institutional, demolition, sign, and certain other applications may use different submission routes. Always confirm the current process before submitting.
Whitby Property Due Diligence Before Renovation or Purchase
Before purchasing a property, planning a major renovation, or leasing premises for a new business in Whitby, it is useful to check the property’s municipal history as well as its current zoning. The Town offers a formal Compliance Letter/Zoning Letter process that can identify records relevant to an owner’s proposed work.
Outstanding Permits & Orders
A Town compliance letter can report open or outstanding building permits and outstanding notices or orders. Those records may affect renovation planning, due diligence, and discussions about existing work.
Previous Variances & Unit Registrations
The Town’s compliance information can identify minor variances granted for a property and approved additional dwelling unit registrations. These records are useful when reviewing a proposed addition, basement apartment, or change of use.
Zoning & Heritage Status
Compliance information may confirm the property’s zoning category and, when requested, heritage status. The actual zoning provisions, amendments, and permitted uses still need a separate project-specific review.
Official Whitby Compliance Letter Information
Review the Town’s compliance letter process before buying or changing an existing property. Deltoid can assist with interpreting available records as they relate to a proposed design or building permit application.
A compliance letter is a due-diligence resource, not a substitute for a building permit, detailed zoning analysis, site inspection, or confirmation that existing work complies with the Ontario Building Code.
Exterior Re-Cladding & Building Envelope Changes in Whitby
Replacing exterior finishes may appear to be a cosmetic improvement, but Whitby’s building permit guidance identifies situations in which re-cladding can require a permit. Examples include work on commercial or multi-unit residential buildings, structural changes, significant changes in cladding materials, or changes that affect an exterior wall’s code-related performance.
Why wall assembly design matters: A change from lightweight siding to brick or stone veneer can affect structural support and connections. Alterations to insulation, cladding, or wall composition can also affect fire-resistance, combustibility, spatial separation, and other building-envelope requirements. The permit path and required engineering should be confirmed with the Town based on the actual proposed work.
Deltoid Consulting can assist with structural review, architectural wall details, attachment and support considerations, and coordination of applicable mechanical or other building-system changes. Refer to the Town of Whitby’s building permit guidance for the current re-cladding examples.
Whitby Building, Planning & Development Resources
The following Town of Whitby, Durham Region, and CLOCA resources are useful starting points when planning a renovation, new building, infill project, additional dwelling unit, commercial fit-out, or development application.
Building & Renovating
Town hub for building permits, inspections, ADUs, accessory structures, decks, infill development, heritage, swimming pools, signs, and related requirements.
Building Permits
Review permit types, required documents, technical drawings, external approvals, submission standards, and E-Portal information.
Whitby E-Portal
Online portal for eligible building and planning applications.
Zoning
Access Whitby’s zoning by-laws, amendments, zoning review, and mapping resources.
Zoning / GeoHub Map
Interactive mapping resource for property and zoning research.
Official Plan
Current Official Plan consolidation, maps, schedules, and planning policy.
Planning Inquiry
Submit a property-specific planning question to the Town.
Committee of Adjustment
Minor variance, land severance, consent, hearing, and appeal information.
Planning Pre-Consultation
Review the Town’s staged pre-consultation process for applicable planning applications.
Site Plan Approval
Requirements for applicable development subject to site plan control.
Additional Dwelling Units
Whitby ADU zoning, permit, registration, and program information.
Infill Development / GSDP
Grading, Servicing and Drainage Permit requirements for applicable infill development.
Decks & Fences
Permit and zoning information for decks and municipal requirements for fences.
Accessory Structures
Requirements for sheds, detached garages, gazebos, pool houses, and similar structures.
Swimming Pools
Pool-enclosure permit requirements and related approvals.
Heritage Permits
Permit information for designated heritage properties and Heritage Conservation District properties.
CLOCA Planning & Permits
Conservation planning, regulation, mapping, natural hazard, and development-permit information.
Region of Durham
Regional services and information relevant to water, sewer, roads, health, and other approvals.
Durham Septic Systems
Private sewage-system permits, building-addition review, applications, and septic records.
Town of Whitby Contacts:
Building Services: building@whitby.ca | 905-430-4305
Planning and Development: planning@whitby.ca | 905-430-4306
Building Services: building@whitby.ca | 905-430-4305
Planning and Development: planning@whitby.ca | 905-430-4306
Why Choose Deltoid Consulting for Your Whitby Project?
Our multidisciplinary approach helps coordinate building design, engineering requirements, site conditions, zoning, grading, servicing, and municipal approvals through one professional consulting team.
Coordinated Multidisciplinary Design
Architectural, structural, civil, HVAC, plumbing, and electrical services can be coordinated as required for the project.
Whitby Permit & Approval Support
Preparation and coordination of drawings, calculations, supporting documents, application requirements, and responses to applicable Town review comments.
Zoning, Planning & GSDP Support
Assistance with zoning reviews, minor variances, planning applications, Site Plan matters, grading, servicing, drainage, and other approvals where applicable.
Residential & Commercial Experience
Engineering and design services for homes, additions, ADUs, basement entrances, restaurants, clinics, offices, retail spaces, industrial facilities, institutional buildings, and other projects across Whitby and the GTA.
Frequently Asked Questions
Common questions about engineering, zoning, design, grading, and building permit applications in Whitby.
Do I need a building permit for my project in Whitby?
A building permit is required for many types of construction, including new homes, additions, structural alterations, decks more than 0.6 m above grade, finished basements, below-grade entrances, additional dwelling units, changes of use, and many commercial, industrial, and institutional alterations. The requirement should be confirmed for the specific scope of work.
How do I submit a building permit application in Whitby?
Whitby accepts many residential permit types through its E-Portal. Commercial, industrial, institutional, demolition, sign, and certain other applications may follow different electronic submission procedures. The current route should be confirmed for the specific permit type.
Which zoning by-law applies to my Whitby property?
Whitby currently administers Zoning By-law 2585 for Downtown Whitby, Zoning By-law 1784 for the former Township of Whitby, and Zoning By-law 5581-05 for the Oak Ridges Moraine. The applicable zoning map, amendments, exceptions, and property-specific provisions should be reviewed.
How many dwelling units can be permitted on a residential lot in Whitby?
Current Whitby zoning can permit up to three additional dwelling units on qualifying parcels of urban residential land, for a total of four residential units, subject to the applicable zoning, dwelling type, servicing, access, hazard-land, conservation, and Ontario Building Code requirements. Different limits apply to some lands outside the urban area and within the Oak Ridges Moraine or Greenbelt.
Can I build a detached additional dwelling unit or garden suite in Whitby?
A detached ADU may be permitted on qualifying properties, subject to zoning, building-permit, servicing, access, lot-specific, and conservation requirements. Whitby’s zoning generally limits detached accessory structures containing an ADU to one additional dwelling unit.
Do I need a permit for a separate basement entrance in Whitby?
A below-grade entrance is a building-permit project and can require architectural and engineered structural information, particularly where foundation walls, framing, retaining walls, stairs, or other structural elements are modified.
Can Deltoid Consulting design a load-bearing wall removal?
Yes. Structural design may include the proposed beam, posts or columns, connections, bearing details, foundations, and temporary shoring requirements depending on the existing construction and proposed work.
What is a GSDP permit in Whitby?
GSDP means Grading, Servicing and Drainage Permit. It applies to certain infill development and can address grading changes, servicing, drainage, earthworks, fill movement, construction activity, and work affecting the public right-of-way.
Do I need a GSDP permit before a building permit?
For applicable infill development, Whitby states that a GSDP permit is typically required before applying for a building permit. The Town uses a pre-screening questionnaire to determine whether the permit is required for a specific project.
Do I need a building permit for a deck in Whitby?
Whitby requires a building permit for a deck that is more than 0.6 m above grade. Zoning, setbacks, foundations, guards, stairs, and structural framing requirements also apply.
Do I need a building permit for a shed or detached garage in Whitby?
An accessory structure other than a shed generally requires a building permit when larger than 10 m². A shed accessory to a dwelling generally requires a permit when larger than 15 m² and/or more than one storey. Zoning requirements apply even where a building permit is not required.
Does a home addition in Whitby require a grading plan?
It depends on the property and project. Additions and infill development can require grading and drainage information, and applicable projects may also require a Grading, Servicing and Drainage Permit from Whitby Engineering Services.
Do I need an engineer for a second-storey addition?
A second-storey addition generally requires structural review of the proposed framing and load path. The adequacy of existing walls, beams, posts, and foundations may also need to be assessed for the additional loads.
Do commercial renovations in Whitby require professional drawings?
Depending on the occupancy, building size, construction type, and scope, professional architectural and engineering documents may be required. Mechanical, electrical, plumbing, structural, sprinkler, accessibility, and life-safety information may also apply.
What if my proposed project does not comply with Whitby zoning?
If the proposed use is permitted but one or more development standards are not satisfied, a Minor Variance may be appropriate. A Zoning By-law Amendment may be required where the proposed use or development requires a broader zoning change.
Do I need site plan approval in Whitby?
Some commercial, industrial, institutional, multi-residential, and other development projects are subject to site plan control. Whitby requires pre-consultation for Site Plan Approval, and applicable site plan approval must be obtained before a building permit can be issued.
When is a heritage permit required in Whitby?
A Heritage Permit is required for applicable changes to properties designated under the Ontario Heritage Act, including individually designated properties and properties located within a Heritage Conservation District.
When do I need CLOCA approval?
CLOCA review or a development permit may be required where work is proposed within or near a regulated valley, stream, wetland, floodplain, erosion hazard, shoreline, or other regulated area. Fill placement, grading changes, enlarged structures, and additional dwelling units can also trigger conservation review depending on the property.
Who approves private septic systems in Whitby?
The Region of Durham Health Department administers permits for private sewage systems in Whitby. Properties with septic systems can also require Regional review for additions or other development that may affect the system.
Who approves water and sewer connections in Whitby?
The Region of Durham administers requirements associated with connections to Regional water and sanitary sewer infrastructure. Town building, engineering, plumbing, and site-servicing requirements may also apply.
Can a project require both a Whitby building permit and ESA approval?
Yes. A municipal building permit does not replace an electrical notification or inspection that may be required by the Electrical Safety Authority.
Can Deltoid Consulting respond to Town of Whitby review comments?
Yes. For technical comments related to our professional scope, we can review the comments, revise the applicable drawings and calculations, and coordinate supporting information for resubmission.
Can I request a compliance or zoning letter before purchasing a property in Whitby?
Yes. The Town’s compliance letter process can provide information about outstanding building permits, notices or orders, zoning, previously granted minor variances, and certain additional dwelling unit registrations. The letter can support property due diligence but does not replace a project-specific review.
Does replacing exterior cladding require a Whitby building permit?
It depends on the building and the work. Whitby’s permit guidance identifies re-cladding situations involving commercial or multi-unit residential buildings, structural changes, significant material changes, or effects on wall assembly performance as circumstances where a permit may be required.
Does Deltoid Consulting provide both residential and commercial services in Whitby?
Yes. We provide multidisciplinary architectural and engineering services for homes, additions, ADUs, structural alterations, restaurants, clinics, offices, retail spaces, industrial facilities, institutional buildings, changes of use, and other projects.
Working with Deltoid Consulting in Whitby
Deltoid Consulting provides architectural and engineering design, building permit drawings, zoning reviews, grading and site engineering, GSDP support, and municipal approval coordination for residential, commercial, industrial, and institutional projects throughout Whitby.
Our multidisciplinary team can assist with architectural, structural, civil, mechanical, plumbing, and electrical engineering requirements and coordinate applicable permit and approval requirements with the Town of Whitby, Region of Durham, CLOCA, and other reviewing agencies where required.
Email:
info@deltoidconsulting.com
Phone:
416-427-2720
Service Area: Whitby, Brooklin, Durham Region, and the Greater Toronto Area