Building permits in City of London
A complete guide for homeowners.
Understand what permits you need, how to apply, and which other approvals may apply to your renovation project.
When do you need a building permit?
Under the Ontario Building Code, municipal building permits are required for most structural, plumbing, HVAC, and electrical work.
Permit usually required
-
Structural changes
Load-bearing walls, foundations, additions
-
Plumbing installations or alterations
-
HVAC installations or alterations
-
Finishing a basement
When it adds habitable space
-
Decks above 600 mm
Higher than 24 inches above grade
-
Detached structures
Above the municipal size threshold
-
New window or door openings
In structural walls
-
Fireplace or wood stove installations
-
Underpinning
Lowering basement floors
-
Demolition
Of buildings or structures
Permit typically not required
-
Paint, flooring, non-structural drywall
-
Cabinet replacement
No plumbing or electrical changes
-
Re-roofing with the same material
No structural changes
-
Like-for-like window or door replacement
Within the same opening
-
Minor landscaping
That does not alter drainage or grading
Always verify before you start
Exemptions can vary by municipality and project scope. Confirm with Development Services - Building Division before beginning work.
The City of London permit process
How to apply for a building permit through Development Services - Building Division.
Where to apply
Fees, timing & contact
How to apply, step by step
-
1
Confirm whether a permit is required
Review the Ontario Building Code permit triggers and check this guide for your specific project type. When in doubt, contact London's Building Division at 519-661-4555.
-
2
Verify zoning compliance
Check your property's zoning using London's interactive CityMap on the Zoning page. Confirm setbacks, lot coverage, and height limits before investing in architectural drawings.
-
3
Check for heritage designation
Look up your address in London's Register of Cultural Heritage Resources. London has seven Heritage Conservation Districts. If your property is designated or in an HCD, exterior changes need Heritage Alteration Permit approval.
-
4
Confirm UTRCA jurisdiction
If your property is near a watercourse, wetland, flood plain, or hazard land, contact the Upper Thames River Conservation Authority (UTRCA) before applying for a building permit.
-
5
Prepare your application package
Collect the required drawings for your project type: site plan, floor plans, structural drawings where required, and energy efficiency compliance (SB-12) for housing.
-
6
Submit through the London Building e-Portal
Create an account on London's Building e-Portal, submit your application and drawings, and pay the applicable fees. Fees are calculated using the Service Index formula in By-law B-7.
-
7
Book your inspections
Once your permit is issued, schedule inspections through the e-Portal or by calling 519-661-4555. Check your permit card for the list of required inspections at each construction stage.
Other approvals you might need
Beyond the municipal building permit, your project may trigger additional provincial or local approvals.
Common City of London renovation projects
Typical permit and approval requirements by project type. Individual projects can differ — always verify with Development Services - Building Division.
| Project | Building | ESA | TSSA | Plumbing | Conservation | Heritage |
|---|---|---|---|---|---|---|
|
Basement finishing
Converting an unfinished basement into habitable living space (new walls, ceilings, flooring, and typically new electrical and sometimes plumbing).
|
Required | Required | If applicable | If applicable | No | No |
|
Kitchen renovation
Cabinet replacement, countertop swap, and appliance changes with potential plumbing, electrical, or gas modifications.
|
If applicable | If applicable | If applicable | If applicable | No | No |
|
Bathroom addition
Adding a new bathroom (typically in a basement or converted space) requiring new plumbing drains, vents, and fixtures.
|
Required | Required | No | Required | No | No |
|
Deck (residential)
Building or replacing an exterior deck attached to a house or freestanding.
|
If applicable | If applicable | No | No | If applicable | If applicable |
|
Load-bearing wall removal
Removing an interior load-bearing wall (e.g., to open a kitchen to a living area) and installing a beam or header.
|
Required | If applicable | No | If applicable | No | If applicable |
|
Addition (single-storey or second-storey)
Adding new habitable space to a home: bump-out, new room, second-storey addition, or sunroom conversion.
|
Required | Required | If applicable | If applicable | If applicable | If applicable |
|
Window or door replacement
Replacing an existing window or door, or creating a new opening in an exterior wall.
|
If applicable | No | No | No | No | If applicable |
|
Roof replacement (reroofing)
Replacing an existing roof with the same or different materials (shingle, metal, membrane).
|
If applicable | No | No | No | No | If applicable |
|
Furnace replacement
Replacing an existing furnace (gas or electric) with a comparable new unit.
|
If applicable | If applicable | If applicable | No | No | No |
|
Central air conditioning installation
Installing or replacing a central air conditioning system (split system with exterior condenser and interior coil).
|
If applicable | Required | No | No | No | No |
|
Gas fireplace installation
Installing a new gas fireplace, insert, or stove with associated venting and gas line.
|
Required | If applicable | Required | No | No | If applicable |
|
Swimming pool (inground)
Installing an inground swimming pool including excavation, shell, equipment pad, and required fencing.
|
Required | Required | If applicable | Required | If applicable | No |
|
Fence
Installing or replacing a residential fence along a property line.
|
Varies | No | No | No | If applicable | If applicable |
|
Detached garage or large shed
Building a detached accessory structure such as a garage, large shed, or workshop.
|
If applicable | If applicable | No | No | If applicable | If applicable |
|
Basement underpinning (lowering floors)
Lowering an existing basement floor by excavating and extending the foundation downward in sections.
|
Required | If applicable | No | If applicable | No | If applicable |
|
Solar panel installation
Installing a rooftop or ground-mount photovoltaic (PV) system with inverter and electrical interconnection.
|
Required | Required | No | No | No | If applicable |
|
Electric vehicle (EV) charger installation
Installing a Level 2 (240V) EV charging station in a garage, driveway, or parking area.
|
No | Required | No | No | No | No |
|
Demolition
Demolishing a building or a significant portion of a building (garage, accessory structure, interior gut).
|
Required | Required | Required | Required | If applicable | If applicable |
Get quotes from City of London pros who handle permits
Skip the guesswork. Connect with verified City of London professionals who understand the permit process and can quote the full scope of your project.
Get free quotesFrequently asked questions
When do I need a building permit in London?
Under the Ontario Building Code, a permit is typically required for structural changes, additions, finished basements that add habitable space, decks more than 600 mm above grade, new plumbing, HVAC installations, and demolitions. Cosmetic changes like paint, flooring, and like-for-like fixture replacements generally do not. Contact London's Building Division at 519-661-4555 to confirm.
How do I apply for a building permit in London?
London accepts online building permit applications through the Building e-Portal. You will need a site plan, floor plans, structural drawings (where required), and energy efficiency compliance documentation for housing. Fees are calculated using the Service Index formula in By-law B-7.
How long does it take to get a building permit in London?
London follows Ontario Building Code statutory review timelines: 10 business days for houses, 15 days for small buildings, 20 days for large buildings, and 30 days for complex buildings. These timelines begin once your application is deemed complete.
What is the Building e-Portal?
London's Building e-Portal is the online system for submitting permit applications, uploading drawings, paying fees, tracking application status, and scheduling inspections. You need to create an account to access the portal.
Do I need UTRCA approval in London?
The Upper Thames River Conservation Authority (UTRCA) regulates development near watercourses, wetlands, flood plains, and hazard lands throughout London. If your property is in a UTRCA-regulated area, you may need their approval before the city can issue your building permit.
Is my London property in a Heritage Conservation District?
London has seven designated Heritage Conservation Districts: Bishop Hellmuth, Blackfriars/Petersville, Downtown, East Woodfield, Old East, West Woodfield, and Wortley Village-Old South. If your property is designated or in an HCD, exterior alterations need a Heritage Alteration Permit in addition to a building permit.
Do I need an ESA permit for electrical work in London?
Yes. The Electrical Safety Authority (ESA) requires a notification for all electrical work in Ontario, regardless of municipality. Homeowners can file ESA notifications for work on their own home, or hire a Licensed Electrical Contractor (LEC). This is separate from your municipal permit.
Do I need a TSSA permit for gas work in London?
Gas work (furnaces, gas fireplaces, gas lines, BBQ hookups) must be performed by a TSSA-certified gas technician with G1 or G2 certification. TSSA-certified contractors handle the regulatory notification and inspection process for you.
Important disclaimers
- This information is for general guidance only and does not constitute legal or professional advice.
- Permit requirements vary by municipality and project. Always confirm with your local building department.
- Information is current as of the date shown. Municipal requirements change - verify before relying on this information.
- RealCraft is not affiliated with any municipal, provincial, or federal government body.
Last verified: