A Plain-Language Guide to Building Permits, Zoning Approvals, and the Local Rules That Decide What You Can Actually Build
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You have picked the spot, sketched the dimensions, and maybe even priced out the lumber. Then the doubt creeps in: do you actually need a permit for this? It feels like it should be a simple yes or no. The honest answer is that it depends on where you live, what you are building, and how big it is — and the size cut-off you found in one quick search is only half the story.
Here is the part most guides skip. Two completely separate approvals can govern a backyard build. One is the building permit, which confirms your structure meets the safety and construction code. The other is the zoning or development approval, which confirms the structure is even allowed at that spot on your lot. A shed can be small enough to skip a building permit and still be against the rules because of where it sits, how tall it is, or how much of your yard it covers. Small enough to skip a permit is not the same as allowed.
And the final say almost never rests with your province. It rests with your city or town. Provinces write the building code, but municipalities administer it, add their own zoning bylaws, and ultimately decide whether your specific project gets a green light. This guide walks you through the building-permit thresholds in all ten provinces and three territories, explains the rules that apply even when you do not need a permit, and gives you a simple way to confirm your own situation before you spend a dollar.
Before you measure anything, it helps to understand the two doors your project might have to pass through, because people constantly assume they are the same door.
A building permit is about safety and structure. It confirms that your garage or shed is built to the building code — the footings, the framing, the snow loads, the way it stands up to wind and weather. When a structure is small and simple enough, many jurisdictions waive this permit, which is where those familiar size thresholds come from.
A development or zoning permit is about location and use. It confirms that what you want to build is permitted on your particular lot, in your particular zone, at the spot you have chosen. Zoning rules cover how far the structure must sit from your property lines, how tall it can be, and how much of your yard all your buildings can cover combined. This is the approval people forget, and it is the one that trips up the most homeowners. You can be fully exempt from a building permit and still need a development permit, or still be breaking a zoning rule that has nothing to do with how well the shed is built.
The reason this matters is simple: a building-permit exemption never waives your zoning obligations. If you are already thinking about permits for a larger project, the same two-door logic applies to almost everything you might add to your property, which is why it is worth reading up on the broader picture of renovation permits in Canada before you start.
It is natural to assume there is a Canadian building permit rule, the way there is a Canadian standard for so many other things. There is not, and understanding why will save you a lot of confusion.
The foundation is the National Building Code of Canada. The key thing to know is that it is a model code, not a law. The National Research Council of Canada develops and publishes it, but as the National Research Council explains, the model code has no legal force on its own. It only takes effect where a province or territory formally adopts it, and provinces frequently adopt it with their own amendments.
That single fact creates the whole layered system you have to navigate. Your province adopts a version of the building code and sets the baseline rules, including the size below which an accessory building is exempt from a building permit. Then your province hands the day-to-day administration — issuing permits, doing inspections, answering your questions — to municipalities or regional agencies. On top of the building code, your municipality writes its own zoning bylaw, which controls where structures can go and how big they can be. A neighbouring town can have completely different setback distances or lot-coverage limits, even though you are both in the same province.
This is why two identical sheds can be treated differently a few kilometres apart, and it is the same reason a backyard deck can be permit-free in one town and permit-required in the next. When a situation is genuinely borderline, the decision belongs to your local Chief Building Official, whose interpretation of the code is the one that counts. The takeaway is reassuring once you accept it: you do not need to memorize the national picture. You need to know your province's baseline and then confirm the details with your own municipality.
Below is the quick reference, then a short summary for each province and territory. Find your region in the table first to baseline your expectations, then read the detail underneath. Remember that the metric figure is the one that governs; the square-foot conversions are approximate, and the size threshold only tells you about the building permit — your zoning rules apply regardless. The same two-door logic applies to other backyard projects, too; a backyard pool, for instance, comes with its own permit and setback requirements.
In British Columbia, the building code generally exempts a detached accessory building under 10 m², or roughly 107 square feet, from needing a building permit on a single-family lot. The catch is location. The City of Surrey, as one example of how this plays out locally, still requires a permit-free shed to sit at least 1.5 metres from property lines and 3.0 metres from other buildings, and to comply with the zoning bylaw for lot coverage and height. So even your small, code-exempt shed has to land in the right spot.
Alberta works the other way around in how it phrases the rule: you need a building permit once your accessory building is larger than 10 m², about 108 square feet. The City of Edmonton reflects this provincial baseline, and like everywhere else, a structure under that size still has to respect setbacks, and any electrical or plumbing work needs its own permit regardless of the building's footprint. Alberta's system is administered by accredited municipalities and regional services commissions, so your local office is your point of contact.
Saskatchewan exempts residential accessory buildings of 10 m² or less, about 107 square feet, from a building permit. What makes Saskatchewan worth a closer look is that a garage usually needs two approvals rather than one. As the City of Saskatoon sets out, a detached garage typically requires both a building permit, which checks the construction, and a development permit, which checks the zoning. It is the clearest reminder that the building-permit question and the zoning question are separate.
In Manitoba, you need a building permit for an accessory building over 10 m². Smaller sheds and garages may be exempt, but building close to a property line or taller than one storey can still trigger a review, and the City of Winnipeg notes that any structure with electrical service needs an electrical permit even if the building itself does not. Height limits and caps on how much of your lot your buildings can cover apply as well.
Ontario draws a helpful distinction between garages and sheds. A detached garage larger than 10 m² needs a building permit. A one-storey storage shed of 15 m² or less, roughly 161 square feet, that is ancillary to your home and has no plumbing does not. As the City of Ottawa explains, this larger shed exemption reflects a change made to the provincial code in 2022, which raised the old limit. Municipal zoning bylaws — setbacks, lot coverage, and height — still apply everywhere in the province, so confirm those locally before you build.
Quebec is the purest example of the municipality calling the shots. The provincial Construction Code, administered by the Régie du bâtiment du Québec, generally does not regulate small residential accessory buildings, and as the Régie du bâtiment du Québec confirms, you do not need a provincial contractor licence to build your own garden shed. That does not mean you can skip approval, though. Almost every Quebec municipality requires a permit or a certificate of authorization to build a shed or garage, each with its own rules on size, siting, and materials. There is no single provincial number here, so your town hall is the only reliable source.
New Brunswick has the most generous provincial threshold in the country. An accessory building with a total floor area of 55 m² or less, about 592 square feet, that is not intended for sleeping is exempt from a building permit — and that covers most backyard sheds, garages, and the "baby barns" New Brunswickers know well. The Southwest New Brunswick Service Commission is clear, though, that zoning and setback rules still apply, and a development permit may still be required even when a building permit is not.
Nova Scotia exempts accessory buildings of 20 m² or less, about 215 square feet, from a building permit under the Nova Scotia Building Code Regulations. A development permit can still be required, however. In the Halifax area, for instance, a structure under 20 m² typically needs only a development permit, while a building permit kicks in at 20 m² or more, or for anything taller than a single storey. As always, the building-permit exemption does not remove your zoning obligations.
Prince Edward Island sets its exemption at 20 m², or 215.2 square feet. Under the province's Building Codes Act regulations, which adopt the National Building Code of Canada, an accessory building at or below that size does not require a building permit. A development permit may still apply, and depending on where your property sits, your permits may be handled provincially or by a municipality such as Charlottetown.
Newfoundland and Labrador does not set a single provincial size threshold. Instead, accessory-building rules come from municipal development regulations and vary widely from community to community. In St. John's, for example, an accessory building is capped at the lesser of ten per cent of your lot area or three-quarters of your home's footprint, with a height limit, rather than a flat square-metre figure. The practical takeaway is the same one that runs through this whole guide: check with your municipality.
The territories each handle this differently. In Yukon, a residential building permit is required for accessory and storage buildings over 130 square feet, about 12 m², and as the Government of Yukon notes, the territory issues permits outside Whitehorse while the City of Whitehorse issues them within city limits. The Northwest Territories has no territory-wide building code for private construction, so the rules that apply to your shed come from your local municipality, such as Yellowknife. Nunavut takes the opposite approach and applies the National Building Code territory-wide through its Building Code Act, administered by the Office of the Chief Building Official. In all three, your local building office is the authority to confirm with.
This is the section to read even if your shed is comfortably under the size limit, because "no building permit" is not the same as "no rules." A handful of requirements apply almost everywhere, regardless of how small your structure is.
Setbacks come first. Every municipality sets minimum distances your structure must keep from property lines, and often from other buildings on your lot. Build too close and you can be ordered to move or remove the structure even if it never needed a building permit. Height limits and lot-coverage caps come next: most zoning bylaws restrict how tall an accessory building can be and how much of your yard all your buildings can occupy combined, so a permit-free shed can still push you over a coverage limit.
Then there are utilities. The moment you add electrical wiring or plumbing, you almost always need a separate electrical or plumbing permit, no matter how small the building is. Running power to a backyard workshop, for example, is its own approval with its own inspection — the same way a panel upgrade or major electrical change requires sign-off from your provincial electrical authority. Finally, watch for overlay rules: heritage districts, floodplains, and conservation-authority lands can add an extra layer of approval that has nothing to do with the size of your shed.
Before you order materials, take ten minutes to confirm five things with your municipality: whether your municipality issues your permits or a regional office does, whether your project needs a building permit at its size, what the zoning bylaw requires for setbacks, height, and lot coverage, whether any overlay rules such as heritage or floodplain designations apply to your lot, and whether you will need a separate electrical or plumbing permit. Get the answer in writing or note who you spoke with, so you have a record before the first board is cut.
It is tempting to assume a small structure will fly under the radar, and sometimes it does for a while. The risk is that the consequences tend to arrive at the worst possible moment, and they can cost far more than the permit ever would have.
If a municipality discovers unpermitted work, it can issue an order to comply or a stop-work order, and in some cases require you to remove the structure entirely — even a finished, well-built one. There can be fines, and there can be the expense and frustration of applying for a permit after the fact, sometimes with the structure already in the ground. The quieter risks show up later. An insurer can dispute a claim involving an unpermitted structure, and unpermitted work has a way of surfacing during a home sale, when buyers and their lawyers ask for paperwork you may not have. Anyone who has navigated the approvals for a legal secondary suite knows how much smoother the process is when the permits are in order from the start.
Building without a required permit can lead to fines, a stop-work order, or an order to remove the structure, and it can create problems with your home insurance and during a future sale. A short conversation with your local building department before you start is the cheapest insurance you will ever buy.
None of this is meant to scare you off a project you are excited about. Most backyard sheds and many garages are entirely achievable, and a great number of them are small enough to skip the building permit altogether. The goal is simply to make sure that the structure you build is one you can keep, enjoy, and pass along with confidence. A quick call to your municipality turns all of this uncertainty into a clear, short list of what you actually need.
About the Author
Angela Nightingale is the Senior Editor at Homeowner.ca with two decades of experience in digital publishing and content strategy. She has owned two homes, taken on her share of DIY projects, and learned what most guides fail to mention. She writes from the belief that the best home guidance comes from people who have lived through the decisions — and her goal is always to leave readers feeling confident, not overwhelmed.
It depends on your province and municipality, because there is no national rule. The building-permit exemption is commonly around 10 m² (about 107 square feet) in British Columbia, Alberta, Saskatchewan, and Manitoba, rises to 15 m² for storage sheds in Ontario and 20 m² in Nova Scotia and Prince Edward Island, and reaches 55 m² in New Brunswick. Quebec and Newfoundland and Labrador leave it to the municipality. Even under the exemption, zoning rules still apply.
Usually the same rules apply as for a shed you build yourself, because permits are based on the structure's size, location, and use rather than how it was assembled. A prefab shed over your province's exemption size will generally still need a building permit, and the zoning rules apply either way.
In most provinces a detached garage is large enough to exceed the building-permit exemption, so a permit is typically required. In several provinces, a garage also needs a separate development or zoning permit. Confirm both with your municipality before you start.
Almost always, yes. Adding electrical wiring or plumbing generally requires its own electrical or plumbing permit and inspection, no matter how small the structure is, even when the shed itself is exempt from a building permit.
A building permit confirms your structure meets the construction and safety code. A development or zoning permit confirms the structure is allowed at that location under your municipal bylaw, covering things like setbacks, height, and lot coverage. A project can need one, both, or occasionally neither.
Yes. If a structure breaks a zoning rule or was built without a required permit, a municipality can order changes or removal, even for a finished building. That is why it is worth confirming the rules before you build rather than after.
Yes. Setbacks are a zoning requirement, not a building-permit requirement, so they apply even when your shed is too small to need a building permit. Building too close to a property line is one of the most common reasons homeowners are ordered to move a structure.
They can. Some rural and unincorporated areas have different thresholds, are administered by a provincial or regional office rather than a city, and may have larger setbacks or their own overlay rules. Check with whichever authority issues permits for your specific property.
Your local Chief Building Official. The province sets the baseline code, but the municipality administers it and makes the final determination for borderline cases, which is why confirming locally is always the right last step.
