Windsor, ON

Building permits in Windsor

Windsor says building permits are required for new construction, additions, alterations, renovations, relocations and many repairs.

Official sources checked Sep. 24, 2026

Permit rules by project

Pick the project that matches your work. These are starting rules for Windsor; property-specific zoning, heritage and trade approvals can still apply.

Sheds & accessory buildings

Depends on scope

Windsor’s main permit page says freestanding structures over 10 m² require a permit, while Ontario’s expanded small-storage-shed exemption can apply to qualifying sheds.

Basement renovations

Confirm with city

Windsor requires permits for many renovations and for basement/main-floor walkouts, but the current main page does not support a blanket yes/no for every basement finishing scope.

Interior alterations

Depends on scope

Windsor requires permits for alterations and renovations that affect regulated building systems or construction; minor repairs can be exempt.

Plumbing / HVAC

Depends on scope

Windsor lists furnace replacements, plumbing/drains and major duct-work changes among permit-required projects; the exact route depends on the trade scope.

Fences

No building permit

Windsor explicitly lists fences as not requiring a building permit, except masonry, concrete and similar fence construction that should be confirmed with the department.

Retaining walls

Confirm with city

Windsor’s permit material identifies retaining walls among designated structures in specified circumstances, but the City does not publish one residential wall-height answer from the current page.

Demolition

Depends on scope

Windsor requires demolition permits for buildings greater than 10 m², with the farm-building exception noted by the city. The broad demolition result stays conditional because smaller/accessory scopes can differ.

Apply or ask Windsor

Use the municipality’s permit office for current forms, fees, drawings and questions about your property.

Windsor Building Department

Phone
519-255-6267 · Detailed permit inquiries; 311 for general information
Hours
Mon–Fri, 8:30 a.m.–4:30 p.m. (except holidays)
Address
350 City Hall Square West, 2nd Floor, Windsor, ON N9A 6S1
Contact the permit office ↗

Your application route

How to apply for a building permit ↗

Windsor uses Cloudpermit for building permit applications, status, payments and inspection requests.

Other approvals

Windsor handles the municipal building/plumbing layer. Electrical work is normally a separate ESA notification/inspection stream, and gas/fuels work is regulated through TSSA/authorized fuels contractors. A building permit does not replace those trade approvals. Province/authority source ↗

Good to know in Windsor

  • The city's examples include decks, garages, wall changes, basement or main-floor walkouts, plumbing, pools and structural changes to windows or doors.
  • Windsor lists decks, porches, sunrooms, garages, additions, structural door/window alterations, most wall additions/removals, plumbing/drain work and swimming pools among common permit projects.
  • The City notes that some minor repairs do not need a building permit and lists ordinary non-masonry fences among no-permit examples.
  • The homeowner can apply, or can authorize a contractor/designer, but the owner is responsible for ensuring the permit is in place before work starts.

Official sources

Use these official links to confirm the current rule for your Windsor property.

View 4 official sources

Sources checked Sep. 24, 2026. Requirements can change; the municipality makes the final permit decision.

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