Guelph basement permit: when you need one and what to submit
The short answer
Yes. Finishing a basement needs a building permit. City fee: $0.59 per sq ft, minimum $160.
Last verified 2026-10-07 · City of Guelph: Residential interior renovations, City of Guelph Building By-law, fees from July 1, 2026 (PDF), City of Guelph: Additional dwelling units- City fee
- $0.59 per sq ft, minimum $160
- Where to apply
- Guelph Permit and Application System (GPAS)
- Review time
- About 10 business days for most house permits, counted from when you pay the fee.
A single-detached lot can have up to three additional dwelling units, and each has to be registered with the City.
What an application usually includes
Guelph’s checklist has the exact list; apply through Guelph Permit and Application System (GPAS).
- Existing and proposed floor plans with room names and sizes
- Ceiling heights, beams and ducts
- Window details for bedroom escape
- Insulation and energy information, and heating and ventilation where they change
- The application form and the owner or designer declaration
Local quirks
- Replacing the railings on an existing deck or porch needs a permit.
- Large inflatable pools and swim spas count as pools: permit and fence first, water after the inspector's written approval.
- The review clock only starts once the permit fee is paid.
Design your Guelph basement to the Building Code.
The design, drawings and code checks work in Guelph today. Guelph’s own forms aren’t built in yet, so you’ll fill those in on the City’s portal.