A Toronto residential building permit costs $20 to $25 per square metre of new floor area in 2026, plus a fixed application fee that runs $200 to $500 depending on scope. A typical 400 sq ft addition is $750 to $1,200 in building-permit fees alone, before plumbing, electrical, or heritage permits land on top.
The fee is rarely the issue. The timeline is.
What the permit actually buys
A building permit is the City's confirmation that the proposed work meets the Ontario Building Code, the Toronto Zoning Bylaw, and any overlay regulations (heritage, ravine, tree). The permit itself is a piece of paper. What it represents is a series of plan reviewers and inspectors looking at your project at multiple points and signing off that it is built to code.
For homeowners the value is two things. First, the permit protects your insurance — uninsured permitless work can void your policy on the affected area. Second, the permit creates a record of the work for resale; an addition without a closed permit is a flag in every home inspection from now until the building is demolished.
For contractors, the permit is a check on our own work. The framing inspector is looking at our framing. The plumbing inspector is looking at our drains. We get told if something is wrong before it gets buried in drywall, which is much cheaper than fixing it later.
What triggers a permit
In Toronto, the following almost always require a permit:
- Any structural change. Removing or modifying a load-bearing wall, beaming over an opening, sistering joists, underpinning.
- Any change to the building footprint or roofline. Additions, dormers, decks above 0.6 m grade, new windows or doors that change the opening size.
- Any new plumbing fixture or relocation of an existing fixture. New basement bathroom, relocated kitchen sink.
- Any new circuit or panel work. Handled through a separate ESA electrical permit but functionally the same.
- Any change of use. Converting a basement to a secondary suite, converting a residential building to a mixed-use space, or vice versa.
- Any work in a Heritage Conservation District that affects the exterior. Even paint colour in some HCDs.
The following do not generally require a permit:
- Replacing finishes like-for-like. New paint, new flooring, new tile in the same location, new cabinets in the same layout.
- Replacing fixtures like-for-like. New toilet in the same spot, new vanity in the same spot.
- Roof shingle replacement (but not roof structure changes).
- Furnace and AC replacement (handled by HVAC contractor's TSSA registration, not a building permit).
- Decks under 0.6 m grade and not attached to the house.
The grey area is renovations that touch a lot of finishes and a little bit of mechanical. A bathroom renovation that keeps the toilet, tub, and sink in their existing locations and just changes the finishes does not strictly require a permit. The moment you move the sink eight feet, it does.
How long it takes
Toronto residential permit review runs 4 to 12 weeks in 2026. The variance depends on:
- Scope. A simple alteration permit (no zoning issues, no engineered drawings, no heritage) clears in 4 to 6 weeks. A full new-build or major addition with zoning analysis takes 8 to 12 weeks.
- Zoning compliance. Anything as-of-right is faster. Anything requiring a Committee of Adjustment hearing for a Minor Variance adds 4 to 6 months on top of the permit timeline. The Committee process is separate from the permit and runs first.
- Heritage. Heritage Permit Applications run in parallel with the building permit but require their own City Heritage Office review, which adds 6 to 12 weeks.
- Reviewer load. The City's plan review queue varies seasonally. Spring submissions move slower because everyone files in spring. We sometimes recommend filing in November to clear by February.
We start the permit application in parallel with final design. The structural drawings, mechanical drawings, and zoning analysis are usually ready before the homeowner has finalized finish selections, so the permit can be in review while design continues. By the time the permit is approved, the project is ready to start.
Heritage Permit Applications
If you are in a designated Heritage Conservation District — Cabbagetown, Blythwood Road, the Distillery District, parts of Riverdale and Forest Hill — exterior work requires a Heritage Permit Application separate from the building permit. The application reviews proposed materials, window proportions, roofline changes, paint colour in some districts, and any visible exterior alteration.
The HPA fee runs $400 to $1,200 in 2026 depending on scope. The review timeline runs 6 to 12 weeks. Heritage Permit Applications go to a different group at the City than the building permit, so the two run in parallel rather than sequentially, but the project cannot start until both are approved.
For more on how heritage neighbourhoods change the calculus, see our Toronto location page. For our process generally, see process.
What if your contractor says you don't need one
Be careful. There are three reasons a contractor will tell you a permit is not required when one is:
- They do not know. Some renovators have never pulled a permit and do not know what triggers one. This is the charitable interpretation.
- They cannot get one. The contractor may not be insured, may not have WSIB coverage, or may not have a track record the City will accept on a permit application. The City does not check the contractor's credentials in detail, but the homeowner's name is on the permit and the contractor's name is on the application.
- They want to skip the inspection load. Permits add a week or two of contractor time across the project for scheduling and meeting inspectors. A contractor working without permits is faster and cheaper, until something goes wrong.
If you are told you do not need a permit for work that obviously qualifies — moving plumbing, structural changes, additions — get a second opinion from another contractor or call the City's permit office directly. The number is on toronto.ca; they will tell you in five minutes whether your scope needs a permit.
The risk of doing permitted work without a permit:
- Insurance claims on the affected area can be denied.
- The City can issue a stop work order and require remediation, including opening up finished work for inspection.
- On resale, an unpermitted addition or finished basement is a disclosure issue that affects price and sometimes kills deals.
- For a secondary suite, an unregistered unit has no legal standing as a rental.
We pull permits on every project that requires one. It adds time and a line item, and it is non-negotiable.
Plumbing and electrical permits
Plumbing and electrical permits are separate from the building permit. Plumbing is handled by the City of Toronto plumbing division and runs $250 to $600 depending on fixture count. Electrical is handled by the Electrical Safety Authority (ESA), an independent provincial regulator, and runs $200 to $500 depending on circuit count.
Both permits trigger their own inspections — rough-in (after wiring or piping is in but before drywall) and final (after fixtures are connected). Each inspection is a half-day commitment for the contractor, which is why we schedule them tightly together at framing-completion and project-completion stages.
What to do next
Ask any contractor you are interviewing how many permits they have pulled in the last two years and which Toronto plan reviewers they have worked with. The answers tell you a lot. Then read our piece on finding a general contractor for the broader interview. If you have a project in early stages, the cost calculator factors permit costs into the estimate.
