Average Renovation Cost per Square Foot in Ontario
You want a rough number for a renovation before you ever call a contractor. The fastest way is to multiply your space by a per-square-foot rate. That gives you a budget range you can plan around.
Most Ontario renovations run $100 to $300 per square foot. The number swings widely based on what you are renovating, the finish level, and whether you change the layout. Here is the breakdown by project type and what shifts the rate.
Renovation Cost per Square Foot in Ontario
| Project type | Cost per square foot |
|---|---|
| Basement finishing (basic) | $40 to $70 |
| Basement finishing (mid to high) | $70 to $140 |
| Bathroom renovation | $300 to $800 |
| Kitchen renovation | $200 to $500 |
| Whole home renovation | $100 to $300 |
| Addition or new build | $300 to $500 |
Kitchens and bathrooms are the most expensive rooms per square foot because of plumbing, electrical, custom cabinetry, and tile work concentrated in small spaces. Basements are the cheapest because they are mostly framing, drywall, and flooring with limited plumbing.
What Pushes the Rate Higher
Plumbing and Electrical Work
The more plumbing and electrical, the higher the cost per square foot. A kitchen has both at high density. A basic basement family room has neither.
Layout Changes
Moving walls, plumbing, or electrical adds cost. Keeping the existing layout is the single biggest way to cut the per-square-foot rate.
Finish Level
Basic, mid-range, and luxury finishes triple the rate. Quartz over laminate, hardwood over vinyl, designer lighting over basic, and custom cabinets over stock all stack up.
Older Homes
Older Oakville homes often need updates behind the walls: outdated wiring, galvanized plumbing, asbestos remediation, or rotted subfloor. A 10 to 15 percent contingency on top of the quote covers most surprises.
How to Use the Rate
Multiply your square footage by the range to get a rough budget, then add 10 to 15 percent for contingency. A 120 square foot bathroom at $400 per square foot is roughly $48,000 before contingency. A 1,000 square foot basement at $70 per square foot is $70,000.
These numbers are starting points, not quotes. The real number depends on your specific space and the choices you make. For room-specific guides, see our breakdowns on kitchen renovation cost, bathroom renovation cost, and basement renovation cost.
Ways to Stay on Budget
- Keep the existing layout.
- Renovate one room at a time instead of a whole house at once.
- Pick mid-range finishes that look premium.
- Refinish or reface where possible (cabinets, hardwood, tubs).
- Schedule the work in fall or winter, when labour rates ease.
- Always carry a 10 to 15 percent contingency.
Cost per Square Foot FAQ
What is the average renovation cost per square foot in Ontario?
Most whole-home renovations run $100 to $300 per square foot. Kitchens and bathrooms run higher, $200 to $800. Basements are lower, $40 to $140.
Why do kitchens and bathrooms cost more per square foot?
They concentrate plumbing, electrical, custom cabinetry, tile, and fixtures in small spaces. A square foot of kitchen has far more work than a square foot of basement family room.
How much should I budget for a whole home renovation?
At $100 to $300 per square foot, a 2,000 square foot home renovation runs $200,000 to $600,000. Specific room mix and finish level shift the number significantly.
Does cost per square foot include labour?
Yes. The per-square-foot rates include labour, materials, and standard finishes. They do not include permits, design fees, or major structural changes.
What is the cheapest way to lower the per-square-foot rate?
Keep the existing layout. Moving plumbing, electrical, or walls adds cost faster than almost any other decision.
The Bottom Line
Use $100 to $300 per square foot as a starting budget for most Ontario renovations. Kitchens and bathrooms cost more, basements cost less. Multiply, add 10 to 15 percent contingency, and call a contractor for a real quote on your space.
Want a real number for your space?
Peace of Mind Interiors gives Oakville homeowners a detailed written quote after a free consultation. 0% financing available. Call (905) 484-7785 or request a free quote.