Do you need a building permit to renovate in Ontario?
Permits are the part of a renovation people most want to skip, and most regret skipping. Here is exactly when Ontario requires one, and when it does not.
Quick answer
In Ontario you need a building permit for structural changes, additions, new or relocated plumbing and HVAC, finishing a basement, decks above a set height, and any change of use. Cosmetic work such as painting, flooring, cabinet swaps, and like-for-like fixture changes usually does not. Permits are issued by your local municipality under the Ontario Building Code.
OBC
Ontario Building Code
Municipal
Who issues permits
ESA
Electrical permits
Days to weeks
Typical review time
When do you need a building permit in Ontario?
A building permit confirms that work meets the Ontario Building Code, which exists for safety. As a general rule, you need a permit when the work affects the structure, the building envelope, or the plumbing, heating, and electrical systems. Common examples that need a permit include:
- Removing or altering a load-bearing wall, beam, or post
- Building an addition, second storey, or dormer
- Finishing a basement or creating a basement apartment or second unit
- Adding or relocating plumbing fixtures, drains, or gas lines
- New or altered HVAC, furnaces, and ductwork
- Decks more than 24 inches (about 600 mm) above grade, and most attached decks
- Changing the use of a space, for example a garage into living space
- New or enlarged window and door openings that affect structure
What renovations do not need a permit?
Cosmetic and like-for-like work generally does not require a building permit in Ontario. That usually covers:
- Painting, trim, and decorating
- Replacing flooring over the same subfloor
- New kitchen cabinets or countertops in the same layout
- Swapping a toilet, vanity, or faucet in the same spot
- Re-shingling a roof with the same material (in most municipalities)
Always confirm locally. Rules vary by municipality, and condos, heritage properties, and conservation areas have extra requirements. When in doubt, a quick call to your local building department, or to us, settles it before you start.
How does the permit process work?
The path is similar across Ontario municipalities, even if the forms differ:
- Drawings and application. You submit plans that show the work and how it meets the code.
- Review. The municipality reviews the application and may ask for revisions.
- Permit issued. Once approved, you pay the fee and receive the permit.
- Inspections. An inspector checks the work at key stages, such as framing, plumbing, insulation, and final.
- Final sign-off. When the last inspection passes, the permit is closed.
Electrical work is separate. It is permitted and inspected by the Electrical Safety Authority (ESA), not the municipality. A qualified contractor coordinates both so the stages line up.
Renovating and unsure about permits?
We manage the whole permit and inspection process as part of your build. Ask us what your project needs.
Talk to ZeybekHow much do permits cost and how long do they take?
Permit fees in Ontario are usually based on the size or value of the work and commonly range from a few hundred dollars for a small job to a few thousand for an addition or basement. Review times range from same-day for simple over-the-counter permits to several weeks for larger projects that need drawings and engineering. Building the permit timeline into your plan is the best way to avoid a delayed start, which we cover in our renovation timeline guide.
What happens if you skip a required permit?
Working without a required permit is a real risk, not a technicality. The consequences can include:
- Stop-work orders and daily fines
- Being ordered to open up or remove finished work for inspection
- Problems selling the home, since buyers and lawyers ask about permits
- Insurance claims being denied if unpermitted work is involved
A reputable contractor will always permit work that needs it. If someone suggests skipping the permit to save time, treat it as a warning sign, which we explain in our guide on how to choose a contractor in Ontario.
Frequently asked questions
Do I need a permit to finish my basement in Ontario?
Yes. Finishing a basement in Ontario needs a building permit because it involves framing, insulation, electrical, and often new plumbing and egress windows. A basement apartment or second unit has additional code requirements.
Do I need a permit to renovate a bathroom or kitchen?
Not for cosmetic updates in the same layout. You do need permits once you add or move plumbing or electrical, or remove a wall. Electrical work is permitted through the ESA.
Who issues building permits in Ontario?
Your local municipality issues building permits under the Ontario Building Code, and its inspectors sign off the work. Electrical permits come from the Electrical Safety Authority (ESA).
How long does it take to get a building permit in Ontario?
Simple permits can be issued same-day or within a few days, while larger projects that need drawings and engineering can take several weeks. Planning ahead keeps your start date on track.
Can a contractor pull the permit for me?
Yes. An experienced general contractor applies for and manages building, plumbing, and electrical permits and coordinates all inspections, so you do not have to deal with the paperwork yourself.
Zeybek Construction
General contractors, Ontario
Written by the Zeybek team from more than two decades of renovation and construction work across Ontario, from Toronto and the GTA to Kitchener, Waterloo, and beyond. We build kitchens, bathrooms, whole homes, additions, and commercial spaces, and we handle permits and inspections as part of the job.
Related guides
Last updated June 30, 2026. This guide is general information for Ontario homeowners and is not a substitute for a site-specific quote or municipal advice. Costs and rules vary by municipality and project.
Let us handle the permits
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