Decks
Depends on scopeLaval distinguishes minor repair/maintenance from work that changes building components or configuration; deck/balcony approval depends on the exact location and scope, so the citywide result remains conditional.
Laval, QC
Building permits in Laval
Ville de Laval separates interior and exterior residential renovation guidance and tells homeowners to check whether a permit is required before starting work.
Official sources checked Sep. 28, 2026
Permit rules by project
Pick the project that matches your work. These are starting rules for Laval; property-specific zoning, heritage and trade approvals can still apply.
Sheds & accessory buildings
Depends on scopeLaval requires a permit for an accessory structure with a footprint of at least 18 m². A shed below 18 m² normally does not need a permit, but a PIIA can still trigger approval.
Basement renovations
Depends on scopeLaval’s renovation guidance makes the permit path depend on whether the basement project changes rooms, structure, plumbing or other regulated building elements rather than being simple maintenance.
Secondary suites & ADUs
Permit requiredLaval states that a permit is mandatory to add an additional dwelling in an existing single-family house.
Home additions
Permit requiredLaval requires a permit for a single-family home addition, including examples such as an added storey, attached garage, permanent attached carport, solarium or veranda.
Interior alterations
Depends on scopeLaval’s interior-renovation requirements vary by the work: simple maintenance can be exempt while changes to rooms, structure or regulated systems can require a permit.
Walls / structural work
Depends on scopeStructural changes are not treated as simple maintenance in Laval; the exact permit path depends on the proposed alteration and property conditions.
Pools / hot tubs
Depends on scopeLaval requires authorization for pool installations and for specified spa installations; enclosure and property-specific conditions affect the exact result.
Garages / carports
Permit requiredLaval requires a permit for a detached garage or permanent detached carport.
Plumbing / HVAC
Confirm with cityLaval’s current renovation material identifies regulated plumbing/heating work, but does not expose one blanket citywide yes/no result for every plumbing or HVAC job.
Fences
Depends on scopeLaval generally does not require an authorization certificate for an ordinary fence, but a PIIA or a pool enclosure can change the approval path.
Retaining walls
Permit requiredLaval states that adding or modifying a retaining wall requires an authorization certificate.
Demolition
Depends on scopeLaval requires an authorization certificate for partial or total demolition of a building with a footprint of at least 19 m². Work below 19 m² is generally exempt, but heritage rules can require additional approval.
Apply or ask Laval
Use the municipality’s permit office for current forms, fees, drawings and questions about your property.
Laval Service de l’urbanisme
- Hours
- Mon–Fri, 8:15 a.m.–12 p.m. and 1–5:15 p.m.
- Address
- 1333 boulevard Chomedey, ground floor, Laval, QC H7V 3Z4
Your application route
Open the official permit page ↗Use the official permit page to confirm project requirements, forms, fees and the current application process.
Good to know in Laval
- For interior work, Laval specifically identifies changes to room dimensions, room count or the structure of the home as situations where a permit can be required; adding a dwelling unit also requires a permit.
- Laval states that a cabanon/remise with a footprint of 18 m² or more requires a permit; smaller sheds can be exempt from the permit but still have municipal rules and PIIA exceptions.
- Quebec permit terminology and process can vary by municipality—and in Montréal, by borough. Keep the project description precise and check whether the work calls for a permit, certificate, declaration or provincial trade requirement.
Official sources
Use these official links to confirm the current rule for your Laval property.
View 5 official sources
Sources checked Sep. 28, 2026. Requirements can change; the municipality makes the final permit decision.
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