If you’re planning to repair, replace, or build a roof in Ontario, there’s more to consider than just shingles and materials. Permits and building regulations play a critical role in your roofing project, and ignoring them can lead to costly fines, delays, or even forced removal of unapproved work.
This guide breaks down what homeowners and contractors need to know about roofing permits and legal requirements across Ontario.
1. Do You Need a Roofing Permit in Ontario?
Short answer: It depends on the scope of the work and local bylaws.
When you do need a permit:
- You are replacing or altering the roof structure, such as rafters, trusses, or support beams.
- You’re adding a new roof over an existing one, which may affect load capacity or fire safety.
- You are making additions or extensions to the house involving roof work.
- Your municipality requires permits for re-roofing above a certain square footage.
When you may not need a permit:
- Basic shingle replacement with no structural changes.
- Minor repairs that don’t affect the underlying structure.
- Replacing underlayment or adding insulation within existing roofing limits.
🔍 Important: Each municipality in Ontario has its own rules. Always check with your local building department.
2. Why Permits Matter: Risks of Skipping One
Failing to obtain the proper roofing permit can have serious consequences:
- Stop-work orders issued by inspectors
- Fines or legal penalties
- Issues with home insurance claims
- Problems during resale if unpermitted work is discovered during inspection
Getting the right permit ensures your roof is safe, code-compliant, and backed by documentation that protects you legally.
3. How to Apply for a Roofing Permit in Ontario
Step 1: Contact Your Local Municipality
Each city or township (e.g. Toronto, Ottawa, Mississauga, Barrie) has its own building department. Visit their website or call to confirm permit requirements for your area.
Step 2: Submit Required Documents
These often include:
- Completed building permit application
- Site plan or drawings of the existing and proposed roof structure
- Material details, especially if you’re changing roof type (e.g. asphalt to metal)
Step 3: Pay Permit Fees
Fees vary by municipality and are typically based on:
- Square footage of the project
- Complexity of the work
- Flat rate permit fee (usually $100–$300+)
Step 4: Schedule Inspections
Most projects require one or more inspections (e.g., framing, final). Your permit will list what’s needed and when.
4. Understanding Ontario’s Building Code for Roofs
Ontario’s Building Code sets minimum standards for:
- Roof slope and drainage
- Ventilation and insulation
- Snow load tolerance
- Fire ratings for materials
- Roof covering installation methods
For example:
- In Northern Ontario, roofs must withstand heavier snow loads than in Southern regions.
- New energy efficiency standards may affect insulation and vapor barrier requirements.
If you’re unsure, a certified roofing contractor should be familiar with local and provincial code requirements.
5. What Homeowners Should Ask Their Roofing Contractor
To ensure your contractor is handling permits and compliance properly:
- “Will this job require a permit? If so, who’s applying for it?”
- “Are you familiar with local building codes in [your city]?”
- “Can I see a copy of the permit before work begins?”
- “Will you arrange for inspections if they’re required?”
Reputable roofers should take care of this process—or clearly explain when it’s your responsibility.
6. Special Considerations: Heritage Homes, Condos & HOAs
Heritage or Historic Designations:
- Roofing changes may require additional approvals to preserve original appearance.
- Some materials or styles may be restricted.
Condos or HOAs:
- Even if you don’t need a municipal permit, your condo board or HOA may have separate approval rules.
- Always check bylaws before beginning roof work.
Final Thoughts
Whether you’re re-shingling or building an addition, roofing in Ontario often involves more than just tools and materials—it’s about doing the job legally, safely, and in line with provincial and municipal rules.
Tip: When in doubt, call your city’s building department. A 10-minute phone call can save you from thousands in repairs, fines, or insurance headaches.