How to Get a Building Permit in Ontario (Step-by-Step 2026 Guide)
Getting a building permit in Ontario involves six steps: confirm you need one, hire a BCIN-qualified designer for your permit drawings, submit a complete application to your municipality, respond to plan review comments, receive your permit, and pass construction inspections before occupancy.
Every Ontario municipality follows the same provincial framework under the Building Code Act, but the specific forms, fee schedules, and review timelines vary by city. This guide walks through the process step by step, whether you're a homeowner finishing a basement or a business owner opening a commercial space.
Step 1: Confirm You Need a Permit
Most construction work that changes a building's structure, layout, plumbing, electrical, or mechanical systems requires a building permit in Ontario — including additions, basement apartments, decks attached to the house, garages, and commercial fit-outs.
Cosmetic work like painting, flooring, or cabinetry replacement without structural changes typically does not require a permit, but zoning by-laws still apply. When in doubt, a quick call to your municipal building department or a BCIN-qualified designer resolves the question before you spend money on the wrong path.
Step 2: Hire a BCIN-Qualified Designer
Ontario's Building Code Act requires permit drawings for Part 9 residential buildings to be prepared by a designer holding a Building Code Identification Number (BCIN) — a provincial qualification earned by exam, not a business licence.
Your designer produces the site plan, floor plans, elevations, sections, and construction details your municipality requires. For commercial projects like restaurants and retail fit-outs, or franchise and QSR builds, this step also involves coordinating with structural, mechanical, or fire protection engineers as the project requires.
Step 3: Submit a Complete Application
A complete building permit application includes your permit drawings, a completed application form, any required supporting documents (surveys, energy efficiency forms, conservation authority clearances), and payment of the municipal permit fee.
Incomplete applications are the single biggest cause of delays — when drawings are missing information or don't comply with the Ontario Building Code, the building department returns them with comments and you go to the back of the review queue.
Step 4: Plan Review and Comments
Municipal plan review typically takes 2 to 8 weeks depending on the city and project complexity, during which the building department checks your drawings against the Ontario Building Code and local zoning by-laws.
If the reviewer has questions or requires changes, they issue a comment letter. Your designer responds with revised drawings or clarifications — a process that can repeat more than once on complex projects.
Step 5: Permit Issuance
Once your application passes plan review, the municipality issues your building permit, and construction can legally begin — starting work before this point risks stop-work orders and fines of up to $50,000 for individuals.
Keep your permit and approved drawings on site; inspectors will reference them throughout construction.
Step 6: Inspections and Occupancy
Construction follows a standard inspection sequence — footing, foundation, framing, plumbing and electrical rough-in, insulation, and final — with each stage signed off by a municipal inspector before work continues.
After the final inspection passes, the municipality issues occupancy clearance and your permit is closed.
Typical Timeline by Project Type
| Project Type | Typical Municipal Review Time |
|---|---|
| Deck / basement finishing | 2–4 weeks |
| Home addition / second storey | 4–8 weeks |
| Legal basement apartment / garden suite | 6–12 weeks |
| Commercial fit-out | 6–16 weeks |
Timelines vary by municipality and current workload. See our GTA permit fee and timeline comparison for a city-by-city breakdown.
Get Your Permit Started
Sandhu Design Build handles this entire process for homeowners and business owners across the GTA — from permit drawings through submission, plan review, and inspections. Contact us at (365) 727-7755 for a free consultation.