Quick Answer Box: Do you need a demolition permit in Ontario? Yes, in nearly every case. The Building Code Act requires a permit to demolish any building, generally anything over 10 square metres, and farm buildings are usually exempt. In Mississauga, a demolition control permit must be issued first.
What Is a Demolition Permit in Ontario?
Do you need a demolition permit in Ontario? Almost always. A demolition permit is written approval from your municipal building department to take down all or part of a building. It comes from the Building Code Act, 1992 and the Ontario Building Code, but your city or township issues it, sets the fees and adds its own conditions.
Leedway Group is a Mississauga custom home builder serving the Greater Toronto Area, so this guide focuses on what homeowners here should sort out before a tear-down starts. Rules differ from one municipality to the next. A demo permit in Mississauga isn’t the same package as one in Ottawa or Sudbury.
Demolition is also one link in a longer approvals chain. Zoning, heritage status, utilities and the replacement home all come into play. If you’re planning a rebuild, the 2026 Ontario Building Code changes are worth reading alongside this guide.
Do You Need a Demolition Permit in Ontario for a House, Garage or Shed?
Yes, if the structure counts as a building. Under the Building Code Act, that generally means anything larger than 10 square metres (about 108 square feet), or a smaller structure that contains plumbing. Houses, attached garages, additions and large sheds all qualify. Your local building department has the final say.
When You Need a Permit to Demolish
A permit to demolish covers partial work too. Municipal guides across Ontario, including Guelph/Eramosa’s, say the rule applies to any building or part of a building that would need a building permit. Taking off a rear addition counts. Pulling down a 9-square-metre garden shed with no plumbing usually doesn’t.
Starting early is expensive. Ottawa, for example, charges a non-refundable administrative surcharge under Building Bylaw 2014-220, on top of any penalties under the Building Code Act. Other municipalities have their own consequences.
Demolition Requirements Before You Apply
Most municipalities ask for a similar core package. Expect some version of the following:
- An owner authorization form if a designer or contractor applies on your behalf
- A site plan showing each building labelled as either to be demolished or to remain, with property lines and easements
- A utility sign-off confirming services are disconnected
- Clearances under Applicable Law, such as zoning and heritage rules
- A professional engineer’s involvement if the building is over three storeys or 600 square metres, in municipalities that set this threshold
Heritage status deserves a check before you buy or plan anything. If a building is designated under the Ontario Heritage Act, Greater Sudbury notes that council approval is required before demolition. Look your address up on the local heritage register first.
Asbestos and Hazardous Materials
Older homes can hide asbestos in floor tiles, plaster and insulation. Ontario’s asbestos regulation makes the building owner responsible for having a report prepared on suspect materials before arranging a demolition. The federal government’s asbestos hazard alert from Employment and Social Development Canada explains why. Fibres release when material is cut, drilled or broken, and only a qualified person should handle it.
That page covers federally regulated workplaces, so Ontario’s provincial rules govern your project. The safety principle is the same.
What Does House Demolition in Mississauga Require?
House demolition in Mississauga needs two approvals: a Demolition Control Permit under By-law 0045-2019 and a building permit to demolish. The city won’t issue the demolition permit until the control permit is in place. The by-law applies to all residential properties, so every homeowner in the city goes through it.
The Two-Year Rebuild Rule
The by-law exists to stop residential demolitions before redevelopment plans are ready. Owners sign a declaration acknowledging that the replacement building must be substantially completed by the date on the permit, and that date can’t be less than two years from the day demolition begins. If more than one person is on title, each owner signs.
In practice, that pushes you to settle your rebuild plans first. Comparing options? Our renovation versus rebuild guide walks through the trade-offs.
Size matters too. Demolishing fewer than six dwelling units follows the standard process with no demolition control fee, though rebuild timelines still apply. Six or more units go through ePlans, and rental units may also need a Section 99.1 permit under the city’s Rental Housing Protection By-law.
Documents Mississauga Asks For
For a residential building, Mississauga lists an Applicable Law Form, the Demolition Control Permit Declaration and a Schedule 1 Designer Information form. The declaration needs the stamp of someone authorized to administer oaths, such as a notary or lawyer.
The site plan must be metric and to scale, with a north arrow, the municipal address, the legal description, dimensioned property lines, easements, and landscaped and hard surfaces. Existing buildings get labelled “to be demolished” or “existing to remain.”
One bonus: if a building is destroyed or rendered unusable by demolition, Mississauga notes you may qualify for a property tax reduction under sections 357 and 358 of the Municipal Act. Ask about it early.
How Do You Get a Demo Permit and Hire Demolition Companies in Ontario?
Confirm zoning and heritage status, gather your drawings and clearances, submit the application to your municipality, and wait for the permit before any work begins. Then hire a contractor who follows the approved method. Some municipalities process this alongside your new-build application.
Hiring Demolition Companies in Ontario
Ask every quote to spell out how the crew handles utility disconnections, suspect materials and debris removal. Site restoration matters as well. Municipalities such as The Blue Mountains require the lot to be graded after debris is cleared so it doesn’t settle unevenly or pond, and an inspector confirms the site is clear.
Planning the Replacement Home
A new home needs its own Ontario building permit, separate from the demolition. Some municipalities, Ottawa among them, issue both together when the replacement permit is applied for first. Mississauga’s control process ties the two together as well, so line up designs early. If a custom build is the goal, see how custom home building works with us.
Frequently Asked Questions
1. Do you need a demolition permit in Ontario to remove a shed or garage?
Usually only if it’s larger than 10 square metres (108 square feet) or contains plumbing. Smaller sheds often fall below the Building Code Act’s definition of a building. Municipal bylaws still differ, so confirm with your building department before removing anything near a property line or utility.
2. How much does a demolition permit cost in Ontario?
Each municipality sets its own fees. Greater Sudbury has published a $108 minimum for regular buildings, for example. Mississauga charges no demolition control fee for fewer than six dwelling units. Contractor costs, utility disconnections and asbestos testing are billed separately, so budget for those beyond the permit itself.
3. What happens if you demolish without a permit in Ontario?
You can face penalties under the Building Code Act, plus municipal charges. Ottawa applies a non-refundable administrative surcharge under its Building Bylaw 2014-220. An unpermitted demolition can also complicate your rebuild approvals, since the city expects clearances and inspections to happen in sequence.
4. What documents do you need for a demolition permit in Mississauga?
Residential applicants submit the following:
- Applicable Law Form
- Demolition Control Permit Declaration, signed by each registered owner
- Schedule 1 Designer Information
- A metric site plan marking buildings to be demolished or kept
5. Does a heritage home need special approval to demolish in Ontario?
Yes. A building designated under the Ontario Heritage Act needs council approval before demolition, as Greater Sudbury’s process shows. Check your municipality’s heritage register before purchasing a tear-down. Designation can stop or delay a project that seemed straightforward on paper.
Conclusion
So, do you need a demolition permit in Ontario? Yes, almost always, and in Mississauga you’ll need demolition control approval first. Check your building department’s rules, confirm heritage status, test for asbestos and settle your rebuild plans before anyone touches the structure.
Planning to build on your lot afterward? Talk to our team about your Mississauga or GTA project.
