It’s one of the first questions almost every homeowner asks us: should I renovate what I have, or tear down and start fresh? The honest answer is that it depends on your existing structure, your goals, and your budget — but the current cost picture in Ontario makes the trade-offs clearer than they’ve been in a while.
What a New Custom Build Costs in 2026
Custom home construction in Ontario is running roughly $300 to $600 per square foot for construction alone in most regions outside the GTA core, with mid-range quality builds commonly landing between $340 and $475 per square foot. That’s before land, permits, development charges, and site work — which typically add another 10 to 30 percent on top of the construction number, depending on the lot.
For a 2,500-square-foot home, that puts all-in construction costs somewhere between $750,000 and $1.5 million before you factor in the cost of the land itself — a number that varies enormously between a serviced London lot and a rural or waterfront property near Grand Bend, Tobermory, or Muskoka.
What a Major Renovation Costs
A whole-home renovation is harder to put a single number on than new construction, because so much depends on what’s already there. As a rough planning guide:
- Cosmetic updates (finishes, fixtures, no structural changes): often $50–$150 per square foot
- Mid-scope renovations (some layout changes, updated systems): often $150–$300 per square foot
- Major renovations (structural changes, additions, full mechanical overhauls): can approach or exceed new-build costs per square foot, especially on older homes with unexpected structural or code-compliance surprises
That last point is the one that catches people off guard: a gut renovation on a century home with knob-and-tube wiring, no insulation, and a foundation that needs work can end up costing more per square foot than building new, once every system has to be brought up to current code.
The Real Decision Factors
Cost per square foot is only part of the picture. The renovate-vs-build decision usually comes down to:
- Structural condition: a sound structure with good bones favours renovating. Significant foundation, framing, or moisture issues shift the math toward rebuilding.
- Lot restrictions: on tight urban lots or environmentally sensitive rural and waterfront lots (common around Tobermory and Muskoka), your existing footprint may have grandfathered rights that a new build wouldn’t retain.
- Emotional and family value: especially for cottages, the existing structure often carries decades of family history that a rebuild can’t replicate — this is a real factor, not just a sentimental one, and it belongs in the decision alongside the numbers.
- Timeline: renovations can sometimes be faster than a full build, though a major renovation with permits and structural work can take just as long as new construction.
Getting a Real Number
Every one of these ranges is a planning tool, not a quote. The only way to know what your specific project will cost is a proper assessment of your existing structure (if there is one), your lot, and your goals. That’s the conversation worth having before you commit to either path.
Weighing renovating your current home or cottage against building new? Let’s look at your specific property and figure out which path actually makes sense.