Here’s what most homeowners don’t know:
You can’t just start tearing out walls or reworking plumbing and hope for the best. In Ontario, you probably need a permit to renovate a bathroom.
And yes, even if it feels like a “simple” bathroom remodel.
Whenever your project involves plumbing work, electrical systems, structural changes, or relocating major bathroom fixtures, you must obtain permits. It’s not just red tape. Permits exist to protect your property, your safety, and your wallet.
They also help ensure your renovation complies with the Ontario Building Code, local bylaws, zoning regulations and other applicable regulations.
When Do You Need a Bathroom Renovation Permit?
You need one if you’re doing more than painting or tiling.
Here’s when a permit is required in Ontario:
Moving or removing structural or load-bearing walls
Changing the location of plumbing fixtures such as a toilet, sink, shower, bathtub, or vanity
Running new electrical wiring or changing electrical systems
Installing new outlets, GFCI receptacles, lighting circuits, or modifying existing electrical work
Installing or updating HVAC systems or bathroom ventilation, including a new exhaust fan
Adding a second unit
Increasing the square metres of your home
Installing new windows or doors where structural modifications are required
Any change in the use of a building, such as turning storage space into living space
This applies to all housing types, including detached homes, condos, townhomes, duplexes, and even mobile homes.
Common Bathroom Renovations That Usually Require a Permit
Many homeowners assume they’re only replacing bathroom finishes when they’re actually performing work that requires approval.
Examples include:
Moving a shower to another wall
Relocating a bathtub or toilet
Installing a double vanity that requires new plumbing
Reconfiguring the bathroom layout
Opening walls to install new plumbing or electrical wiring
Replacing water-damaged structural framing or subfloor work caused by long-term moisture damage.
Enlarging the bathroom by removing or moving walls
If your renovation changes the layout or affects plumbing, electrical, ventilation, or structural components, contact your local building department before work begins.
What Work Doesn’t Require a Permit?
Cosmetic changes typically don’t require approval. These are often referred to as permit exemptions because the work doesn’t affect the building’s structure, plumbing, electrical systems, or occupancy. Even so, municipalities may interpret exemptions differently, so always confirm before starting work.
For example:
Replacing a toilet or kitchen sink in the same location
Painting, tiling, flooring, replacing waterproofing membranes beneath tile finishes, and other interior design updates usually don’t require permits unless plumbing, structural components, or electrical systems are altered.
Installing custom cabinetry if you don’t touch plumbing or electrical
Replacing a vanity in the same location without altering plumbing
Swapping light fixtures without changing wiring
Replacing a shower pan where no plumbing relocation is required
Still, always check with your local building department. Rules can vary slightly between municipalities, and what qualifies as cosmetic work may differ depending on the project scope.
Average Cost of a Permit in Ontario
So, how much does a permit cost?
It depends on your location and the size of the construction project.
Standard bathroom permit: $150 to $300
Projects with structural work or second units: $300 to $700
Extra permits for electrical, plumbing, or HVAC: $100 to $200 each
Some municipalities add extra fees for multiple inspections or plan reviews. Always ask upfront before submitting your permit application.
Why the Ontario Building Code Matters
All of this comes back to the Ontario Building Code. It sets the minimum safety standards for construction work throughout the province.
The code covers:
Electrical systems and wiring
Plumbing fixtures, water supply, and drainage systems
Structural framing and fire separation
HVAC systems and ventilation
If your renovation changes the building’s use, affects fire safety, or adds new square metres, the Building Code Act applies. Following it isn’t just a legal requirement. It protects your investment and helps ensure your renovation passes inspections.
Electrical work must also comply with the Ontario Electrical Code and may require inspections from the Electrical Safety Authority (ESA). Plumbing installations must meet current code requirements for drainage, venting, and water supply.
Electrical and Plumbing Safety Requirements
Bathroom renovations involve more than installing attractive fixtures. They also need to meet strict safety standards.
For example:
GFCI outlets are required near sinks to reduce the risk of electric shock.
New electrical wiring must meet the Ontario Electrical Code, including proper grounding and bonding requirements where applicable.
Shower and bathtub installations require approved anti-scald valves.
Plumbing systems must meet current drainage and venting requirements.
Larger renovations may require a rough-in inspection before walls are closed.
Materials and fixtures should comply with applicable CSA plumbing standards where required.
Depending on the scope of plumbing work, additional devices such as a backflow preventer may be required under local plumbing regulations.
Basement bathroom projects may also involve installing a backwater valve where required by local municipal standards.
These inspections help identify problems before drywall is installed, reducing the risk of expensive repairs later.
How the Building Permit Process Works
What You'll Need for Your Permit Application
Before your municipality reviews your project, you’ll usually need to submit a complete building permit application.
Depending on the renovation, this may include:
Detailed renovation drawings
Existing and proposed floor plans
Plumbing fixture locations
Electrical layout
Structural details if walls are being removed
Supporting documents requested by your municipality
Submitting complete information the first time can reduce approval delays and help keep your renovation on schedule.
Step-by-step:
Draft detailed renovation plans. Show layout, fixtures, wiring, and proposed changes.
Submit your building permit application to your municipal building department. Many municipalities now offer online application portals.
Pay the required permit fee. Costs depend on project size, type, and systems involved.
Wait for approval. Permit timelines vary by municipality. Small bathroom renovations may be approved within a few business days, while projects involving structural changes, engineering reviews, or multiple permits can take several weeks. Smaller projects may take only a few business days, while larger renovations may take several weeks.
Pass inspections. Your local building department and the Electrical Safety Authority (ESA), where applicable, will inspect your renovation at different stages, including:
After the plumbing rough-in inspection
During required electrical inspections
Before drywall installation
Final inspection once the project is complete
Without approved inspections, you won’t receive final approval for your renovation.
The Mistake to Avoid
Don’t start demolition before permits are approved.
Cities like Toronto and Ottawa treat this as unauthorized construction. That can lead to fines, project delays, stop-work orders, or even requiring completed work to be removed so inspectors can verify compliance.
Getting your approved plans first is almost always faster and less expensive than fixing permit issues later.
Permit Details as per Cities in Ontario
Major Cities
GTA (Peel, York, Halton, Toronto, Hamilton)
Each municipality has its own building department, fee schedule, and permit application process. While the Ontario Building Code applies across the province, local bylaws and submission requirements can differ.
Toronto – Interior alterations and most plumbing or electrical work require a permit.
Mississauga – Most renovation projects require a permit. Confirm zoning requirements even if a permit isn’t needed.
Brampton – Homeowner guides outline interior alteration requirements and submission packages.
Caledon – Applications are submitted online and reviewed against the Ontario Building Code and local zoning.
Vaughan – Some home renovations require permits. Check Building Standards before applying.
Markham – Building permits are required before construction or renovation begins. Plumbing may require a separate permit.
Richmond Hill – Residential alteration and addition applications can be submitted online.
Newmarket – Most renovation and alteration projects require permits under the Ontario Building Code.
Oakville – Moving walls or relocating plumbing requires a permit. Simple fixture replacements usually don’t.
Burlington – Most interior renovations require permits. Confirm your project scope with Building Services.
Milton – Home renovation permits are required, with electronic application submissions.
Halton Hills – Building Services provides permit triggers, application requirements, and fee schedules.
Hamilton – Interior renovations require permits when adding or relocating plumbing.
Always contact your local Building Code Services department before beginning work, as permit requirements and timelines can vary between municipalities.
Ottawa & London
Ottawa – Building permits are required for interior renovations, plumbing work, and new bathrooms.
London – Permits are required for plumbing fixture relocations and most interior renovations.
Durham Region
Oshawa – Apply online. Building permits generally include plumbing when drawings are submitted.
Whitby – Permits are required for adding or removing walls and plumbing or drain work.
Ajax – Building and plumbing permits are available through the Online Application Portal.
Pickering – Interior alterations involving walls or plumbing require permits.
Clarington – Structural or plumbing work requires permits through Municipal Building Services.
Waterloo Region
Kitchener – Separate plumbing and electrical permits are common. Check fixture counts and fee schedules before relocating plumbing.
Waterloo – Interior alterations involving plumbing fixtures or walls generally require a permit.
Cambridge – Layout changes, plumbing relocation, structural work, and electrical modifications usually require permits.
Niagara Region
St. Catharines – Most renovations involving plumbing require permits.
Niagara Falls – Online permit applications with current municipal fee schedules.
Welland – Residential renovations require permits and additional reviews where applicable.
Grimsby – Interior alterations follow standard building permit application requirements.
Northern Ontario
Greater Sudbury – Most plumbing work requires a plumbing permit.
Thunder Bay – Permits are required when finishing basements or adding bathrooms.
North Bay – Building permits are required before starting most renovations.
Sault Ste. Marie – Renovation and alteration permits are generally required.
Timmins – Renovation applications are reviewed against the Ontario Building Code and local zoning.
Other Ontario Municipalities
Guelph – Most interior residential renovations require permits with electronic submissions.
Kingston – Building permits are required for most renovation projects.
Peterborough – Interior demolition and renovations require permits, with renovation checklists available.
Barrie – Plumbing alterations require additional forms as part of the permit process.
Windsor – Residential alteration permits are available through online applications.
Sarnia – Plumbing is reviewed through the County of Lambton and may require plumbing fixture forms.
Permit Costs (citywise)
Bathroom renovation permit costs aren’t the same across Ontario. Every municipality sets its own fee schedule, minimum charges, and calculation method.
Most cities calculate fees using construction value or floor area, while others use flat rates for residential alterations.
Here are current permit costs across major municipalities as of August 2026.
| Region / City | Permit Costs |
|---|---|
| Toronto | Interior/plumbing/electrical based on construction value; minimum ~$198. |
| Peel – Mississauga | ~$15 per $1,000 construction value; minimum ~$198. |
| Peel – Brampton | ~$15 per $1,000 construction value; minimum ~$198. |
| Peel – Caledon | Value-based; minimum ~$198. |
| York – Vaughan | ~$16.50 per $1,000 construction value; minimum ~$200. |
| York – Markham | ~$16.50 per $1,000 construction value; minimum ~$200. |
| York – Richmond Hill | ~$16.50 per $1,000 construction value; minimum ~$200. |
| York – Newmarket | ~$16.50 per $1,000 construction value; minimum ~$200. |
| Halton – Oakville | $4.90 per m² (interior alterations/basements/finishings). |
| Halton – Burlington | Minimum $377; other fees per schedule. |
| Halton – Milton | $6.42 per m²; minimum $259.02. |
| Halton – Halton Hills | ~$6.00 per m²; minimum ~$250. |
| Hamilton | $4.06 per m² (interior alterations); minimum $291. |
Ottawa & London Permit Costs
| City | Permit Costs |
|---|---|
| Ottawa | $12 per $1,000 construction value (no new GFA); minimum $110. |
| London | $13 per $1,000 construction value; minimum $198. |
| City | Permit Costs |
|---|---|
| Oshawa | 2025 fees frozen at 2024 levels; minimum ~$115 + plumbing fixture fees. |
| Whitby | Minimum $238; additional per-m² rates by class. |
| Ajax | By-law schedule; fees vary by class. |
| Pickering | Minimum $160; per-m² rates by occupancy. |
| Clarington | ~$14 per $1,000 construction value; minimum ~$200. |
| City | Permit Costs |
|---|---|
| Kitchener | $0.37 per sq ft; minimum $95. |
| Waterloo | $0.55 per sq ft; basement bathroom flat fee ~\$313.60. |
| Cambridge | $0.52 per sq ft; minimum $140. |
| City | Permit Costs |
|---|---|
| Niagara Falls | Minimum $239; additional fees by classification. |
| St. Catharines | ~$14 per $1,000 construction value; minimum ~$200. |
| Welland | Flat rates; typical minimum ~\$200 for residential renovations. |
| Grimsby | Standard application; minimum ~\$200 for alterations. |
| City | Permit Costs |
|---|---|
| Guelph | Electronic applications; value- or area-based fees (check schedule). |
| Kingston | $7.10 per m²; minimum $147.55. |
| Barrie | $7.83 per m²; minimum $178.48 (Part 9). |
| Windsor | $1.75 per sq ft (~$18.84/m²) + $500 mechanical per dwelling; minimum $235. |
| Greater Sudbury | ~$12 per $1,000 construction value; minimum ~\$150. |
| Thunder Bay | ~$12 per $1,000 construction value; minimum ~\$150. |
| North Bay | ~$12 per $1,000 construction value; minimum ~\$150. |
| Sault Ste. Marie | ~$12 per $1,000 construction value; minimum ~\$150. |
| Timmins | ~$12 per $1,000 construction value; minimum ~\$150. |
Should You Hire a Contractor?
If this is your first home renovation, trying to manage the entire process yourself can be risky.
If you’re planning a DIY bathroom renovation, remember that you’re still responsible for obtaining permits, arranging inspections, and ensuring the work complies with the Ontario Building Code. Hiring a licensed contractor often makes the process much smoother and reduces the chance of costly mistakes.
Experienced bathroom contractors understand:
The Building Code Act and local building codes
Municipal permit requirements and permit applications
How to prepare compliant renovation plans
The complete renovation process, including required inspections
When electrical permits, plumbing permits, or demolition permits are required
How to coordinate inspections with municipal building departments and the Electrical Safety Authority (ESA)
Many contractors also provide a free estimate, helping you understand both renovation and permit costs before work begins.
Hiring experienced home renovation contractors is one of the easiest ways to avoid delays, failed inspections, and unexpected expenses.
Renovating an Older Home?
If your home is several decades old, your renovation may uncover issues that weren’t visible at the start of the project.
Examples include:
Outdated plumbing materials
Older electrical wiring that doesn’t meet current code
Water damage affecting structural framing
Load-bearing walls that require engineering review
In some situations, a structural engineer may need to review your plans before permits are approved. Homes designated under the Ontario Heritage Act may also require additional approvals before renovations begin.
Why This Matters
Skipping the legal side may seem like it saves time, but it can create much bigger problems later.
Here are some of the potential consequences of completing unpermitted work:
Insurance companies may deny insurance coverage or reject future claims.
Regulatory authorities can issue stop-work orders until permits are obtained.
Municipal inspectors can require completed work to be opened or removed for inspection.
Real estate transactions may be delayed or fall through during a home sale.
Unapproved renovations can reduce resale value and create problems during future inspections.
Following the proper permit process protects both your investment and your family’s safety.
Final Advice
If your bathroom renovation involves plumbing, electrical work, ventilation, structural changes, or relocating fixtures, you’ll likely need permits.
Check with your local building department before starting work, as permit requirements can vary between municipalities.
Follow the complete approval process, from permit application through every required inspection.
Budget for permit fees, inspection costs, and any additional permits your renovation may require.
Work with experienced contractors who understand Ontario’s building permit process and local regulations.
Following the Ontario Building Code may feel like extra work, but it protects your home, helps your renovation pass inspections, and prevents expensive problems later.
Before starting your upcoming renovation, speak with your municipality, confirm the permit requirements for your specific project, and keep all approvals in writing. Taking the time to do it properly now can save you significant time, money, and stress in the future.