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.
How the Building Permit Process Works
Step-by-step:
Draft detailed renovation plans. Show layout, fixtures, wiring, and changes.
Submit to your municipal building department. Online portals make this easier.
Pay the fee. Depends on size, type, and systems involved.
Wait for approval. Smaller projects = a few business days. Bigger ones take longer.
Pass inspections. Your local building department and the Electrical Safety Authority will check at multiple stages:
After the plumbing rough-in
After electrical systems are installed
Before drywall
Final inspection when work is done
Without approved inspections, you don’t get the green light to move forward.
The Mistake to Avoid
Don’t start demolition before permits are approved.
Cities like Toronto and Ottawa treat this as unauthorized construction. That means fines, delays, or tearing out finished work.
Get your approved plans first.
Permit Details as per Cities in Ontario
Major Cities
GTA (Peel, York, Halton, Toronto, Hamilton)
Each city handles things slightly differently.
Toronto – Interior alterations and most plumbing/electrical work need a permit.
Mississauga – Most renovation projects need a permit; confirm zoning even if no permit is needed.
Brampton – Homeowner guide covers interior alteration requirements and submission package.
Caledon – All applications online; permit reviews against Ontario Building Code and zoning.
Vaughan – Some home renovations require permits; check Building Standards before applying.
Markham – You need a building permit before starting construction/renovation; plumbing may require a separate permit.
Richmond Hill – Online applications for residential alterations/additions.
Newmarket – Most renovation/alteration projects require a permit; governed by the Ontario Building Code.
Oakville – Moving walls or relocating plumbing requires a permit; simple fixture swaps usually don’t.
Burlington – Permits required for most interior renovations; confirm scope with Building Services.
Milton – Building permits required for home renovations; applications are electronic.
Halton Hills – Building Services outlines permit triggers and fees.
Hamilton – Interior renovations require permits when adding or relocating plumbing.
Contact Building Code Services in your area before doing anything.
Ottawa & London
Ottawa – Building permit required for interior renovations, plumbing, and new bathrooms.
London – Permit required for plumbing fixture changes and most interior renovations.
Durham Region
Oshawa – Apply online; building permit includes plumbing where drawings are submitted.
Whitby – Permits required for adding/removing walls and plumbing/drain work.
Ajax – Building + plumbing permits via Online Application Portal; check “home & property renovations.”
Pickering – Interior alterations (adding/removing walls, new/modified plumbing) require a permit.
Clarington – Permits required for structural or plumbing work; check municipal building services for application steps.
Waterloo Region
Kitchener – Separate plumbing/electrical permits are common; check fee by-law and fixture counts before you move anything.
Waterloo – Interior alterations (moving walls/fixtures) generally need a building permit; use the city permit page for costs/timelines.
Cambridge – Altering layout, moving plumbing, or structural/electrical changes typically needs a permit; start with the city permits hub.
Other Ontario Municipalities
Guelph – Residential permits needed for most interior renovations; applications submitted electronically.
Kingston – Building permit required for most renovations; inspection timelines may apply.
Peterborough – Interior demolition/renovation needs a permit; checklist available for additions/renos.
Barrie – Plumbing alterations trigger forms; residential permits cover typical bathroom renos.
Windsor – Permits needed for alterations/renovations; applications online.
Sarnia – Plumbing reviewed by County of Lambton; plumbing fixture form often required.
Niagara Region –
St. Catharines – Permit required for most renovations; includes plumbing work.
Niagara Falls – Online permit process with 2025 fee schedule.
Welland – Building/renovating permits required; basement additions reviewed for radon.
Grimsby – Standard application requirements for interior work.
Northern Ontario –Greater Sudbury – Most plumbing work requires a plumbing permit.
Thunder Bay – Permit needed for basement finishing and adding bathrooms.
North Bay – Permit required before starting most renovations.
Sault Ste. Marie – Permits required for renovations/alterations.
Timmins – Permits required for construction/renovation; reviewed against Ontario Building Code and zoning.
Permit Costs (citywise)
Bathroom renovation permits aren’t the same everywhere in Ontario — each city sets its own fee structure. Here’s a breakdown of current permit costs across major municipalities as of August 2025
| 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. |
| 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 alone is risky.
Experienced Bathroom Contractors understand:
The Building Code Act and local building codes
How to create compliant renovation plans
The full renovation process, including inspections
When electrical permits or demolition permits are required
Plus, most offer a Free Estimate. That alone can save you time and help with budget planning.
Hiring home renovation contractors with years of experience is the best way to avoid missteps.
Why This Matters
Skipping the legal side might seem faster now, but it can hurt you in the long run.
Here’s what happens without the necessary permits:
Insurance companies can deny your claim
Real Estate deals can fall through
Regulatory authorities can order changes or the removal of unapproved work
If you want to protect your home, follow the rules. That means understanding applicable law and the building permit process from day one.
Final Advice
- If your bathroom remodel involves plumbing, electrical work, or square metre changes, get permits
Check with your local building department for project-specific answers
Follow the full approval process, from application to final inspection
Budget for permit costs and potential additional permits
Work with professional contractors who know the system
Following Ontario’s building code might seem like extra work now, but it’s the best way to stay protected.
Before your upcoming renovation, talk to your local officials and get everything in writing. Start smart, stay compliant, and make your home safer in the process.