Building permits in City of Mississauga
A complete guide for homeowners.
Understand what permits you need, how to apply, and which other approvals may apply to your renovation project.
When do you need a building permit?
Under the Ontario Building Code, municipal building permits are required for most structural, plumbing, HVAC, and electrical work.
Permit usually required
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Structural changes
Load-bearing walls, foundations, additions
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Plumbing installations or alterations
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HVAC installations or alterations
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Finishing a basement
When it adds habitable space
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Decks above 600 mm
Higher than 24 inches above grade
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Detached structures
Above the municipal size threshold
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New window or door openings
In structural walls
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Fireplace or wood stove installations
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Underpinning
Lowering basement floors
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Demolition
Of buildings or structures
Permit typically not required
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Paint, flooring, non-structural drywall
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Cabinet replacement
No plumbing or electrical changes
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Re-roofing with the same material
No structural changes
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Like-for-like window or door replacement
Within the same opening
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Minor landscaping
That does not alter drainage or grading
Always verify before you start
Exemptions can vary by municipality and project scope. Confirm with Building Division before beginning work.
The City of Mississauga permit process
How to apply for a building permit through Building Division.
Where to apply
Fees, timing & contact
How to apply, step by step
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1
Confirm whether a permit is required
Review the Ontario Building Code permit triggers and check this guide for your specific project type. When in doubt, contact Mississauga's Building Division at 311.
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2
Verify zoning compliance
Check your property's zoning using Mississauga's interactive zoning map (By-law 0225-2007). Confirm setbacks, lot coverage, and height limits before investing in architectural drawings.
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3
Check for heritage designation
Look up your address against Mississauga's heritage property database. If your property is designated or located in a Heritage Conservation District (Meadowvale Village, Old Port Credit), exterior changes need Heritage Planning review.
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4
Confirm Conservation Authority jurisdiction
If your property is near a watercourse, wetland, or flood plain, contact the relevant Conservation Authority (CVC for most of Mississauga, TRCA for eastern areas) before applying for a building permit.
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5
Create an ePlans account
Register for an account on Mississauga's ePlans portal. All building permit applications must be submitted online through this system.
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6
Prepare your application package
Collect the required drawings for your project type: site plan, floor plans, structural drawings where required, and energy efficiency compliance (SB-12) for housing.
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7
Submit through ePlans
Submit your application through ePlans and pay the administration fee. You will receive an email with your project number and instructions to upload drawings and supporting documents.
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8
Book your inspections
Once your permit is issued, book inspections through 311 or the ePlans portal at the construction stages required by your permit.
Other approvals you might need
Beyond the municipal building permit, your project may trigger additional provincial or local approvals.
Common City of Mississauga renovation projects
Typical permit and approval requirements by project type. Individual projects can differ — always verify with Building Division.
| Project | Building | ESA | TSSA | Plumbing | Conservation | Heritage |
|---|---|---|---|---|---|---|
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Basement finishing
Converting an unfinished basement into habitable living space (new walls, ceilings, flooring, and typically new electrical and sometimes plumbing).
|
Required | Required | If applicable | If applicable | No | No |
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Kitchen renovation
Cabinet replacement, countertop swap, and appliance changes with potential plumbing, electrical, or gas modifications.
|
If applicable | If applicable | If applicable | If applicable | No | No |
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Bathroom addition
Adding a new bathroom (typically in a basement or converted space) requiring new plumbing drains, vents, and fixtures.
|
Required | Required | No | Required | No | No |
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Deck (residential)
Building or replacing an exterior deck attached to a house or freestanding.
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If applicable | If applicable | No | No | If applicable | If applicable |
|
Load-bearing wall removal
Removing an interior load-bearing wall (e.g., to open a kitchen to a living area) and installing a beam or header.
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Required | If applicable | No | If applicable | No | If applicable |
|
Addition (single-storey or second-storey)
Adding new habitable space to a home: bump-out, new room, second-storey addition, or sunroom conversion.
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Required | Required | If applicable | If applicable | If applicable | If applicable |
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Window or door replacement
Replacing an existing window or door, or creating a new opening in an exterior wall.
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If applicable | No | No | No | No | If applicable |
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Roof replacement (reroofing)
Replacing an existing roof with the same or different materials (shingle, metal, membrane).
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If applicable | No | No | No | No | If applicable |
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Furnace replacement
Replacing an existing furnace (gas or electric) with a comparable new unit.
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If applicable | If applicable | If applicable | No | No | No |
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Central air conditioning installation
Installing or replacing a central air conditioning system (split system with exterior condenser and interior coil).
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If applicable | Required | No | No | No | No |
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Gas fireplace installation
Installing a new gas fireplace, insert, or stove with associated venting and gas line.
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Required | If applicable | Required | No | No | If applicable |
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Swimming pool (inground)
Installing an inground swimming pool including excavation, shell, equipment pad, and required fencing.
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Required | Required | If applicable | Required | If applicable | No |
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Fence
Installing or replacing a residential fence along a property line.
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Varies | No | No | No | If applicable | If applicable |
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Detached garage or large shed
Building a detached accessory structure such as a garage, large shed, or workshop.
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If applicable | If applicable | No | No | If applicable | If applicable |
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Basement underpinning (lowering floors)
Lowering an existing basement floor by excavating and extending the foundation downward in sections.
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Required | If applicable | No | If applicable | No | If applicable |
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Solar panel installation
Installing a rooftop or ground-mount photovoltaic (PV) system with inverter and electrical interconnection.
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Required | Required | No | No | No | If applicable |
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Electric vehicle (EV) charger installation
Installing a Level 2 (240V) EV charging station in a garage, driveway, or parking area.
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No | Required | No | No | No | No |
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Demolition
Demolishing a building or a significant portion of a building (garage, accessory structure, interior gut).
|
Required | Required | Required | Required | If applicable | If applicable |
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Get free quotesFrequently asked questions
When do I need a building permit in Mississauga?
Under the Ontario Building Code, a permit is typically required for structural changes, additions, finished basements that add habitable space, decks more than 600 mm above grade, new plumbing, HVAC installations, and demolitions. Cosmetic changes like paint, flooring, and like-for-like fixture replacements generally do not. Contact Mississauga's Building Division at 311 to confirm.
How do I apply for a building permit in Mississauga?
Mississauga requires all building permit applications to be submitted online through the ePlans portal. You will need a site plan, floor plans, structural drawings (where required), and energy efficiency compliance documentation for housing.
How long does it take to get a building permit in Mississauga?
Prescreening takes 7-10 business days. Once your application is confirmed complete, statutory review timelines apply: 10 business days for houses, 15 days for small buildings, 20 days for large buildings, and 30 days for complex buildings. Incomplete applications are not subject to these timelines.
What is ePlans and how do I use it?
ePlans is Mississauga's online portal for building permit applications. You create an account, submit your application, pay fees, and upload drawings through the system. The portal also allows you to track your application status and book inspections.
Do I need Conservation Authority approval in Mississauga?
Mississauga is covered by two Conservation Authorities: Credit Valley Conservation (CVC) for most of the city, and TRCA for eastern areas near Etobicoke Creek. If your property is in a regulated area (near a watercourse, wetland, or flood plain), you may need their approval before the city can issue your building permit.
Is my Mississauga property in a Heritage Conservation District?
Mississauga has two established Heritage Conservation Districts: Meadowvale Village (Ontario's first HCD, 1980) and Old Port Credit Village (2004). Streetsville is under study for HCD designation. If your property is designated or in an HCD, exterior alterations need Heritage Planning approval in addition to a building permit.
Do I need an ESA permit for electrical work in Mississauga?
Yes. The Electrical Safety Authority (ESA) requires a notification for all electrical work in Ontario, regardless of municipality. Homeowners can file ESA notifications for work on their own home, or hire a Licensed Electrical Contractor (LEC). This is separate from your municipal permit.
Do I need a TSSA permit for gas work in Mississauga?
Gas work (furnaces, gas fireplaces, gas lines, BBQ hookups) must be performed by a TSSA-certified gas technician with G1 or G2 certification. TSSA-certified contractors handle the regulatory notification and inspection process for you.
Important disclaimers
- This information is for general guidance only and does not constitute legal or professional advice.
- Permit requirements vary by municipality and project. Always confirm with your local building department.
- Information is current as of the date shown. Municipal requirements change - verify before relying on this information.
- RealCraft is not affiliated with any municipal, provincial, or federal government body.
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