Trois-Rivières, QC

Building permits in Trois-Rivières

Trois-Rivières says a construction permit is required for construction, additions or building modifications regardless of project cost.

Official sources checked Sep. 24, 2026

Permit rules by project

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

Decks

Permit required

Trois-Rivières states that a construction permit is mandatory for construction, addition or modification of a building and publishes required documents for patios/galleries.

Basement renovations

Depends on scope

Construction, addition and building modification require a permit in Trois-Rivières, while some minor work can use a declaration or exemption route; basement scope controls the result.

Secondary suites & ADUs

Depends on scope

Trois-Rivières requires municipal authorization through the conditional-use process for an ADU and directs applicants to the citizen permit portal to obtain the required permit.

Interior alterations

Depends on scope

Interior work can require a construction permit when it modifies the building, while some minor work is handled through declaration or exemption routes; scope determines the result.

Garages / carports

Permit required

Trois-Rivières publishes permit requirements and project documentation for garages and carports under its construction-permit process.

Plumbing / HVAC

Depends on scope

Some mechanical installations and alterations are permit work while other minor trade work can follow declaration or separate routes; exact Plumbing/HVAC scope must be confirmed.

Fences

Permit required

Trois-Rivières includes fences, hedges and low walls in its construction-permit project list and specifies documents to provide with the permit application.

Retaining walls

Confirm with city

Trois-Rivières publishes permit material for walls and exterior construction, but the current City page does not give one height-only retaining-wall permit rule.

Apply or ask Trois-Rivières

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

Trois-Rivières Direction de l’aménagement et du développement durable

Hours
Mon–Fri, 8:30 a.m.–12 p.m. and 1–4:30 p.m.
Address
4655 rue Saint-Joseph, C.P. 368, Trois-Rivières, QC G9A 5H3
Contact the permit office ↗

Your application route

Open the official permit page ↗

Use the official permit page to confirm project requirements, forms, fees and the current application process.

Other approvals

Trois-Rivières administers municipal permits/certificates and zoning. Regulated electrical/plumbing/heating/gas trade work also sits within Québec’s provincial contractor-licensing framework, so municipal authorization is not the only compliance layer. Province/authority source ↗

Good to know in Trois-Rivières

  • The city separately provides a declaration-of-work route for certain lighter residential projects that meet its criteria.
  • Quebec municipalities can organize residential approvals differently, with Montréal adding borough-level variation. Confirm the exact permit, certificate, declaration and trade requirements for the project.

Official sources

Use these official links to confirm the current rule for your Trois-Rivières property.

View 2 official sources

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

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