Solar panel permits by city | BuildRules

The rule changes by municipality

Start with the city where the property is located.

Burlington, OntarioBurlington lists solar collectors not mounted to buildings with a face area under 5 m² as permit-exempt; other solar installations need project-specific permit review.

The City also publishes a building permit requirements package for solar electric and thermal panels, so building-mounted or larger systems should be treated as permit projects unless confirmed otherwise.

Open Burlington rules

Hamilton, OntarioYes. Hamilton lists solar panels among exterior projects that require a building permit.

The building permit covers construction and structural safety. Electrical approvals remain separate.

Open Hamilton rules

Markham, OntarioMarkham lists ground- or roof-mounted solar photovoltaic panels among housing projects that do not require a building permit.

That exemption is specific to the City’s building-permit list. Electrical work remains outside the municipal building-permit process and other site or heritage conditions may still apply.

Open Markham rules

Mississauga, OntarioYes. Mississauga lists solar panels among projects that require a building permit.

The building permit addresses the construction and structural side of the installation. Electrical approvals are a separate responsibility.

Open Mississauga rules

Oakville, OntarioOakville requires a building permit when the accumulated face area of the solar panels is at least 5 m².

The Town also requires an engineer to assess the supporting building structure for the solar installation.

Open Oakville rules

Toronto, OntarioIt depends on the system. Toronto says rooftop solar greater than 5 m² needs a building permit, while free-standing ground-mounted solar generally does not require a building permit but must follow zoning.

Solar projects can also require Electrical Safety Authority approval and Toronto Hydro interconnection. The permit path is therefore not just a building-code question.

Open Toronto rules

Why BuildRules separates cities

Ontario sets the Building Code. Municipal rules, zoning, processes and project guidance still differ.

We publish a city only after attaching municipal sources to the project answer. Missing coverage stays missing instead of borrowing another city’s rule.