Thinking about expanding your home? Here’s everything you need to know to correctly plan your home addition project in Toronto, including new regulations, construction costs, and expert advice as of May 2025.
1. Understand Zoning Bylaws and Lot Coverage
Toronto zoning bylaws govern:
- Setbacks (how far your addition must be from property lines)
- Lot coverage (how much of your lot can be built on)
- Maximum height and number of stories
- Parking requirements
Tip: Use Toronto’s Interactive Zoning Map to check your property’s constraints before calling a contractor.
2. Building Permits Are Mandatory
Most home additions in Toronto—including:
- Second-story additions
- Rear or side extensions
- Sunrooms or attached garages
Require a building permit, click on this links to get more information .
Starting April 1, 2025, all new applications must follow the 2024 Ontario Building Code.
Permit Fee Updates (2025):
- Minimum base fee: $198.59
- $17.16 per m²
- Fee increase: +4% (from January 1, 2025)
3. Required Documents for Your Permit
To apply for a Toronto home addition permit, you’ll need:
- Site plan with property lines
- Floor plans (existing & proposed)
- Elevations
- Energy efficiency compliance forms
- Structural or engineering drawings (if needed)
Pro tip: If your addition is under 100 m², apply via the FASTRACK program for quicker approval (within 5 days).
4. Budget Wisely: Construction & Soft Costs
Average Construction Costs (2025):
| Type of Addition | Cost per Sq. Ft. |
|---|---|
| Basic Room | $250–$400 |
| Second Story | $350–$450 |
| Sunroom (piles) | $150–$250 |
| Sunroom (foundation) | $265–$310 |
| Garage Conversion | $200–$300 |
| High-End Additions | Up to $750 |
Soft Costs:
- Architect: $2,500–$4,500
- Road Damage Deposit: $2,642
- Inspection Fees: $85.79/hr
5. Work with Licensed Professionals
Hire a:
- BCIN-qualified designer or architect
- Structural engineer (if required)
- Experienced contractor familiar with Toronto building codes
Where to find help:
Services like Home stars , Reno-assistance, google review can connect you with verified professionals but do not only trust on reviews.
6. Timelines & Living Arrangements
- Planning & permits: 1–3 months
- Construction:
- Basement: 2–4 months
- Second Story: 6–12 months
Plan for temporary living if your renovation will impact the kitchen, bathrooms, or upper floors.
7. Think Long-Term: ROI & Resale
- Additional bedrooms or in-law suites can increase home value by 10–30%
- Legal basement apartments may generate rental income
- Second-story additions preserve backyard space—ideal for Toronto city lots
Final Thoughts
A successful home addition in Toronto starts with knowledge. Every step matters—from understanding zoning rules to budgeting and working with licensed professionals.
Stay informed
Plan ahead
Ensure compliance
to avoid delays and unexpected costs.
Need help planning or pricing your next home addition project in Toronto?
Check Zoning Bylaws
Use the Interactive Zoning Map to confirm what’s allowed on your lot.
Hire Professionals
Work with a BCIN-certified designer, architect, and possibly a structural engineer.
Prepare Application Documents
Includes site plan, floor plans, elevations, energy forms, and structural drawings.
Submit the Permit Application
Apply online or in person to the Toronto Building.
Pay the Permit Fees
Base fee: $198.59 + $17.16 per m² (as of 2025).
Wait for Review & Approval
Standard review: 2–6 weeks
FASTRACK (under 100 m²): ~5 days
Receive Permit & Post On-Site
Permit must be visible on the job site before construction begins.
Schedule Inspections During Construction
At key stages like footing, framing, insulation, and completion.
Fee: $85.79/hr if extra time or re-inspections are required.
Let us know—our team’s here to guide you. We are one of the best contractors for home additions in Toronto .