OSHAWA
Professional Engineering, Design & Building Permit Solutions
Engineering & Building Permit Services in Oshawa
Deltoid Consulting provides professional architectural design, structural, civil, mechanical, plumbing and electrical engineering, and building permit services for residential, commercial, industrial and institutional projects in Oshawa, Ontario.
From basement apartments, garden suites, below-grade entrances, additions and replacement homes to restaurants, medical and dental clinics, offices, retail units and industrial buildings, our multidisciplinary team coordinates the drawings and technical documents applicable to each project. Services may include zoning review, architectural layouts, structural calculations, HVAC and plumbing design, electrical engineering, grading and site servicing, municipal application coordination and responses to technical comments.
Oshawa projects may involve the City’s Building Services, Planning Services and Engineering Services, plus the Region of Durham, Central Lake Ontario Conservation Authority (CLOCA), Electrical Safety Authority and other agencies. Early review of zoning, servicing, grading and applicable law can reduce redesign and permitting delays.
Engineering & Building Permit Services We Provide in Oshawa
We help coordinate the technical disciplines and municipal documents needed for both residential and non-residential construction projects.
Architectural & Building Design
Plans, elevations, sections and permit documentation for renovations, additions, replacement homes, additional residential units, changes of use and commercial improvements.
Structural Engineering
Structural assessment and design of beams, columns, foundations, retaining walls, underpinning, openings, framing and other load-bearing components.
Building Permit Services
Coordinated permit drawings, forms, engineering calculations and responses to comments from Oshawa Building Services.
Civil & Site Engineering
Grading, stormwater, drainage, erosion control and servicing plans for additions, new dwellings, infill development and non-residential sites.
Mechanical & Electrical Engineering
HVAC, ventilation, plumbing, electrical and building-system design for residential, commercial, industrial and institutional work.
Planning & Development Approvals
Zoning analysis, minor variance support, site plan coordination and planning documentation where required.
Engineering Reports & Assessments
Field inspections, existing-building assessments and technical reports related to proposed alterations and construction.
Common Residential & Commercial Projects in Oshawa
Our projects can range from smaller structural modifications to coordinated design and approvals for complete new buildings.
- Residential renovations and structural alterations: basement finishing, wall removal, joist and beam changes, underpinning and foundation work.
- Additional dwelling units: basement apartments, other accessory apartments and garden suites, subject to Oshawa zoning and building code requirements.
- Below-grade entrances: foundation openings, walk-outs, stairs, retaining walls, drainage and waterproofing considerations.
- Home additions and second-storey additions: architectural, structural, HVAC and grading coordination.
- New and replacement houses: custom residential designs, energy documentation, site plans, lot grading and municipal servicing.
- Decks, garages, sheds, pergolas, cabanas and accessory structures: location, footings, structural framing and permits where required.
- Residential infill and intensification: engineering drawings, grading, erosion control and stormwater reporting tailored to the proposed unit count.
- Restaurants, offices, clinics and retail units: tenant fit-outs, changes of use, ventilation, plumbing, electrical, accessibility and life-safety coordination.
- Industrial and institutional alterations: equipment supports, building additions, building systems, structural alterations and site engineering.
Oshawa Building Permits & Building By-law 33-2009
The City administers construction and demolition permit applications under the Ontario Building Code and its building by-law. The permit scope and supporting documentation depend on the work proposed.
Building By-law: Oshawa Building By-law 33-2009, as amended (including By-law 118-2025 in the linked consolidation), addresses municipal administration of permits. Refer to the current Building By-law PDF and City building permit guidance when preparing a submission.
Building Permit Requirements
Check construction activities that require a permit, common exceptions, forms and supporting information.
Online Application Portal
Apply for supported permit types, review application status and pay applicable fees using the City’s official entry page.
Basement Renovations
Review the City guidance for basement finishing and associated changes to walls, rooms and building systems.
Demolition Permits
Check requirements for building or structure demolition and related documentation.
Permit vs. Zoning: A building permit exemption does not mean an exemption from zoning, grading, heritage, conservation, electrical or other applicable requirements. The City identifies some small detached structures without plumbing as potentially permit-exempt; confirm all conditions for your project.
Oshawa Zoning By-law 60-94 & Property Review
Before design, establish the zoning designation, permitted use and property-specific rules. Setbacks, height, lot coverage, landscaped open space, parking, driveways and exceptions can affect project feasibility.
Oshawa Zoning Information
Overview of how the City regulates land use, building location, height, lot size and parking.
Zoning By-law 60-94
Read the City’s comprehensive zoning by-law, as amended, including definitions, standards and exceptions.
mapOshawa Interactive Map
Identify the zoning of a particular Oshawa property before reviewing the related by-law text.
Committee of Adjustment
Understand minor variance and consent applications where a proposal needs relief or a division of land.
Property-Specific Review: Zoning designations shown online should be checked against the most recent by-law amendments, special provisions and site conditions. A proposal not compliant with a standard may require a minor variance; a prohibited use may require a zoning by-law amendment or other planning process.
Accessory Apartments, Additional Dwelling Units & Garden Suites
Oshawa provides specific municipal guidance for accessory apartments, including units inside an existing home and certain detached accessory buildings. The number and location of units depend on the individual property and the current zoning framework.
Accessory Apartment Requirements
Review Oshawa’s guidance on permitted arrangements, zoning, parking, garden suites and permit application materials.
Garden Suites & Detached Units
Detached accessory dwelling projects must satisfy applicable accessory building and dwelling provisions, including access, height, lot coverage and services.
Basement Conversion
Basement apartments can require fire separations, egress, ventilation, heating, plumbing, structural changes and compliant entrances.
Zoning and Parking Review
Verify parking requirements and driveway or curb-cut limitations rather than assuming requirements from another Durham municipality.
Parking and Access: The City’s accessory apartment guidance includes minimum parking dimensions, required additional parking spaces and rules about direct street access. Changes to curbs or driveways may require Oshawa approval or Durham Region approval on a regional road. Verify current provisions and any applicable exceptions for the property.
Below-Grade Entrances, Basement Renovations & Structural Engineering
A new basement entrance often has interacting structural and civil design requirements. An opening in an existing foundation wall, exterior stairs or excavation can affect the load path, retaining walls, soil support, foundation drainage and setbacks.
Residential Basement Renovations
Review Oshawa information about basement renovation permits and applicable supporting drawings.
Load-Bearing Wall Removal
We can design new steel or engineered wood beams, columns, connections, footings and temporary shoring arrangements as needed.
Foundation Openings & Underpinning
Foundation modifications may involve reinforced openings, waterproofing, structural calculations, excavation support and underpinning design.
Grading & Site Drainage
Exterior walk-outs require appropriate surface drainage and may trigger City engineering or site alteration review.
Home Additions, Decks & Accessory Structures
Residential projects require separate checks for building permits and zoning compliance. Foundations, structural loading, roof drainage and site coverage should be coordinated before construction.
Home Additions & Second Storeys
An addition may require confirmation that the existing framing, walls and foundations can carry new loads.
Decks
Review Oshawa’s deck permit guidance, including when a deck may be exempt and the applicable structural and zoning considerations.
Accessory Structures
Garages, sheds, cabanas, pergolas and related buildings may be subject to setbacks, lot coverage, height, structural and permit requirements.
Pools & Hot Tubs
Pool-related permits, protective barriers, equipment locations and applicable grading should be checked before work starts.
Driveways & Curbs
Driveway changes and curb cuts are subject to City requirements and may affect landscape open space and parking compliance.
Fences & Exterior Work
Check fences and property work separately from building permit requirements, particularly around pools, corner lots and drainage.
Site Alteration By-law 85-2006, Lot Grading & Stormwater Management
Oshawa has a distinct site alteration approval framework. Filling, excavation and grade changes can create drainage impacts even when the associated building work is straightforward.
Site Alteration By-law: Review By-law 85-2006, the City’s landscaping and grading guidance, and current Engineering Design Criteria for project-specific approval and technical requirements.
Residential Infill: 1–3 Units
Oshawa identifies a site plan, engineering or grading information, architectural drawings and a stormwater management report among typical submission materials.
Residential Infill: 4–10 Units
For qualifying infill proposals exempt from site plan agreement, the City identifies site/engineering drawings and stormwater management documentation; consult its Design Criteria Manual.
Pre-Servicing & Fill Operations
Early grading or fill operations may require erosion and sediment control, haul routes, soils management, insurance, securities and applicable CLOCA permissions.
Engineering Design Standards
The City publishes its design criteria, appendices, standard drawings and related sewer and site alteration bylaws.
Lot Grading Plans
Existing and proposed elevations, swales, slopes, drainage directions, foundation elevations, driveway grades and adjacent property impacts.
Stormwater Management
Runoff quantity and quality considerations, storm connections, on-site controls, erosion protection and engineering reports where required.
Erosion & Sediment Control
Construction-phase controls to limit migration of sediment and protect catchbasins, streets and receiving drainage systems.
Retaining Walls & Excavation
Structural and civil coordination for walls, steps, excavation limits, drainage and changes in grade.
New Homes, Replacement Dwellings & Development Engineering
New residential construction may involve a building permit as well as civil engineering submissions, applicable servicing permissions, zoning compliance and external agency clearances.
Custom Homes & Replacement Homes
Coordinated floor plans, elevations, foundations, structural framing, mechanical systems, energy information and permit drawings.
Oshawa Developer Requirements
Municipal developer and builder information for infrastructure, grading, securities and related development procedures.
Design Criteria & Standard Drawings
Review engineering guidance for grading, roads, storm drainage, site servicing and drawings.
Water & Sanitary Connections
Regional requirements may apply for new connections or modifications to watermains and sanitary services.
Commercial, Industrial & Institutional Projects in Oshawa
Interior alterations and changes of use can trigger fire and life-safety, accessibility, zoning, plumbing, ventilation, electrical and structural review even when exterior construction is limited.
Restaurants & Food Service
Architectural layouts, kitchen exhaust and makeup air, plumbing, electrical, accessibility and public-health coordination.
Medical & Dental Clinics
Treatment room layouts, equipment supports, medical plumbing, ventilation, electrical loads, fire safety and accessibility.
Offices & Retail Units
Tenant fit-outs, changes of use, partitions, washrooms, mechanical and electrical work, exits and fire protection.
Industrial Buildings & Equipment
Structural modifications, equipment platforms, mezzanines, alterations and additions, mechanical systems and site improvements.
Schools & Institutional Buildings
Accessibility improvements, renovations, ramps, structural engineering, HVAC and electrical systems.
Signs & Façade Changes
Commercial signs may be subject to separate sign approvals, and certain structural sign installations can require engineered documentation.
Change of Use: An occupancy change may require a building permit and zoning review even without extensive construction. Before leasing space, confirm the proposed use, exits, occupant load, barrier-free access, plumbing fixtures, fire separations and building systems.
Planning Applications, Heritage Properties & Other City Reviews
Some projects need planning decisions or external approvals before a building permit can be issued. These reviews should be identified during feasibility and schematic design.
Development Applications
Information on zoning amendments, site plan matters, planning approvals and supporting studies.
Committee of Adjustment
Minor variances and consent applications where the property and proposal meet the applicable process.
Planning Services
Municipal planning contacts and information about development policy and approvals.
Official Plan & Land Use
Review Oshawa’s municipal planning framework and development application procedures.
Heritage Properties
Designated or listed heritage properties may require heritage review or permission for particular alterations.
Oshawa Executive Airport
Projects in certain airport-influenced areas may require an additional review of applicable land-use and height restrictions.
Durham Region, CLOCA & Other Agency Approvals
Oshawa is part of the Regional Municipality of Durham. Regional services and conservation regulation are distinct from the City’s building permit and zoning processes.
Durham Region Water & Sewer
Regional permits or approvals may be required for connections to water and sanitary sewer infrastructure, depending on project and location.
Central Lake Ontario Conservation Authority
CLOCA-regulated areas may include floodplains, watercourses, valleys, wetlands, shoreline or erosion hazards. Regulated-area mapping is a screening tool, not a permit determination.
Durham Region Health
Food premises and certain other projects may need review by Durham Region public health authorities.
Electrical Safety Authority
A municipal building permit does not replace an ESA electrical notification or inspection where required.
Durham Connection Permits
Regional water and sanitary sewer connection requirements and permits.
Durham As-Built Drawings
Access information about available municipal water, sewer and other regional infrastructure records.
CLOCA Permits & Inquiries
Check the conservation authority’s permit process before undertaking work in a regulated area.
CLOCA Regulation Mapping
Review the authority’s mapping and regulated-area information.
CLOCA Regulated Areas GIS
Explore published spatial mapping as a preliminary screening reference.
Professional Engineering, General Review & Building Permit Documents
Certain projects require a licensed architect, professional engineer or another qualified designer, depending on the building, occupancy, complexity and applicable legal requirements.
Architectural & Engineering Drawings
Discipline-specific drawings, code analysis, details and engineering calculations prepared by the appropriate qualified professionals.
General Review During Construction
Where required and contracted, professionals undertake periodic general review of construction within their respective disciplines.
Design Changes & Field Conditions
Changes to existing construction or design assumptions may require updated details, revised calculations and coordinated permit documents.
Existing Records & Property Information
Existing permit records and other City information may require a formal records request or applicable information process.
Oshawa Building Permit Application Process
A practical submission sequence helps avoid preventable review comments. Requirements and timing depend on the actual project.
1
Define the Scope & Review Existing Conditions
Collect survey information, available drawings, project objectives and details of the existing structure or site.
2
Check Zoning & Property Restrictions
Use mapOshawa and Zoning By-law 60-94 to review use, setbacks, coverage, height, parking and property-specific provisions.
3
Identify Other Permits & Approvals
Determine whether site alteration, minor variance, heritage, CLOCA, Durham servicing, public health, ESA or other approvals apply.
4
Prepare Coordinated Design Documents
Prepare applicable architectural, structural, mechanical, plumbing, electrical, grading, drainage and engineering information.
5
Complete Application Documents
Assemble the construction or demolition application, survey/site plan, owner authorization, supporting reports and professional documentation where required.
6
Submit Through the City Portal
Follow the City’s Application Portal guidance and current digital submission standards.
7
Respond to City Technical Review
Address review comments within the agreed professional scope and coordinate revised documents or supporting information.
8
Obtain Permit & Complete Inspections
After required clearances and fees are addressed, follow permit conditions and arrange inspections and professional general review where applicable.
Submission Tip: Use the City’s current Building Permits page for forms, digital drawing standards, available permit application types and status information. Avoid bookmarking long login URLs containing session-specific parameters.
Official Oshawa Building, Planning & Engineering Resources
These City and regional references help identify requirements; each project should be reviewed against the latest available regulations and amendments.
Building Permits
City permit guidance, submission procedures and application requirements.
Application Portal
Official municipal portal entry page.
Zoning Information
Municipal property zoning guidance and related regulations.
Zoning By-law 60-94
Consolidated zoning by-law reference.
Building By-law 33-2009
Building permit administration, as amended through the linked consolidation.
Interactive City Map
mapOshawa and geographic municipal information.
Accessory Apartments
City guidance for accessory units and garden suites.
Basement Renovations
City information for basement work.
Accessory Structures
City information for sheds, garages and other detached structures.
Decks
Residential deck guidance.
Pools & Hot Tubs
Applicable safety and permit considerations.
Landscaping & Grading
Site alteration and residential infill requirements.
Site Alteration By-law 85-2006
City regulation relating to fill and grade alteration.
Engineering Design Criteria
Design criteria, standard drawings and technical bylaws.
Developer Requirements
Development-related submission and technical resources.
Committee of Adjustment
Minor variances and land consents.
Heritage Properties
Heritage property considerations.
Driveways & Curbs
Driveway access and curb alterations.
Sign Permits
Municipal commercial sign regulations.
Demolitions
Demolition permit guidance.
CLOCA Inquiries & Permits
Conservation permit information.
Durham Water & Sewer Permits
Regional connection permit guidance.
Why Choose Deltoid Consulting for Your Oshawa Project?
Our multidisciplinary approach is designed to coordinate technical design and documentation between disciplines and the relevant approval authorities.
One Coordinated Design Team
Architectural, structural, civil, mechanical, plumbing and electrical services can be integrated into a coordinated submission.
Oshawa-Specific Approval Awareness
Review of local zoning, building permits, grading, infill and engineering requirements for the proposed project.
Residential & Commercial Scope
Experience across additions, ADUs, clinics, restaurants, industrial spaces, offices and structural alterations.
Technical Review Support
We can review and respond to City comments relevant to our contracted scope and revise technical documents as needed.
Frequently Asked Questions About Building Permits in Oshawa
Do I need a building permit for a renovation in Oshawa?
Many structural alterations, additions, new dwelling units and significant building-system changes require permits. Some cosmetic work may be exempt; check the City’s building permit guidance and the project specifics.
How do I apply for a building permit in Oshawa?
The City accepts supported applications through its online Application Portal. Prepare required digital drawings, owner authorization if applicable and supporting documents before submission.
Which zoning by-law applies in Oshawa?
Oshawa uses Zoning By-law 60-94, as amended. Use mapOshawa to identify the property zoning and review applicable provisions and exceptions.
Can I add a basement apartment or garden suite in Oshawa?
Potentially, depending on zoning, dwelling type, access, parking, servicing and building code requirements. The City publishes an accessory apartment guide addressing attached and detached units.
How many parking spaces are required for an accessory apartment?
Oshawa publishes specific parking provisions and direct-access rules for properties with additional units. Confirm the current requirements and any applicable exceptions for the site.
Does a separate basement entrance require an engineer?
A foundation opening, retaining wall, excavation or structural change may need structural engineering and suitable drainage design. The permit requirements depend on the proposed work.
Can I remove a load-bearing wall?
Yes, subject to appropriate structural evaluation and design of replacement beams, posts, connections and supporting foundations where necessary.
Do I need a permit for a deck, shed or garage?
Permit requirements depend on dimensions, height, attachment, use and other conditions. Even a permit-exempt structure must comply with relevant zoning and other regulations.
What is Oshawa Site Alteration By-law 85-2006?
It regulates relevant site alteration activities. Changing grade, importing or exporting fill and some development-related grading may require municipal review or approval.
What grading documents are needed for residential infill?
The City identifies site and engineering drawings and stormwater management documentation for its residential infill categories; requirements depend on project size and site conditions.
Do replacement homes need a grading plan?
Grading and drainage submissions may be necessary, particularly where footprint, elevations, drainage patterns or infill conditions change. Confirm the City’s current engineering requirements.
What if my proposed addition does not meet zoning setbacks?
A minor variance may be an option where the proposal requires relief from a zoning standard. Some proposals may instead require different planning approvals.
Does my project need CLOCA approval?
It may if the property is within a regulated area or the work otherwise triggers conservation requirements. Check the mapping and confirm the permit requirement with CLOCA.
Who handles water and sanitary sewer connections?
The Region of Durham administers permits for applicable connections to regional water and sanitary sewer infrastructure. City permits and engineering reviews may also apply.
Can Deltoid prepare drawings for restaurants and medical clinics?
Yes. We provide coordinated architectural, structural, HVAC, plumbing and electrical design for commercial tenant improvements and changes of use, as required.
What about heritage buildings and airport-related restrictions?
Some properties may have heritage requirements or location-specific airport-related planning constraints that should be checked early in design.
Can Deltoid respond to Oshawa building permit comments?
We can address comments relating to the contracted professional scope, including revisions to relevant drawings, details and calculations.
Does an Oshawa permit replace ESA or public-health approvals?
No. Electrical notifications, health approvals and other applicable approvals may be required separately from a municipal building permit.
Working with Deltoid Consulting in Oshawa
Deltoid Consulting provides architectural and engineering design, building permit drawings, zoning reviews, structural engineering, grading, drainage and site engineering for projects across Oshawa and Durham Region.
Our team can coordinate technical submissions for the City of Oshawa, Region of Durham, CLOCA and other applicable authorities, depending on the project and agreed services.
Email: info@deltoidconsulting.com
Phone: 416-427-2720
Service Area: Oshawa, Durham Region, Greater Toronto Area and Ontario