Cost of Home Addition in London, ON
Building a new addition to expand living space, including foundation, framing, and finishing
Prices are estimates for London, ON as of 2026. Actual costs vary based on project specifics.
What Affects Home Addition Cost in London?
London is in the Southwestern Ontario region of ON. Local costs are 10% below the Canadian national average, driven by local labour rates, material availability, and demand for skilled trades.
Timeline & Planning
Typical Timeline
3-8 months
Permits
A building permit is typically required in London. Check with your local building department.
Best Time to Book
Foundation work best started in spring after frost
Compare Home Addition Costs Across Cities
| City | Low | Average | High | vs London |
|---|---|---|---|---|
| London, ON | $180 | $315 | $495 | — |
| Winnipeg, MB | $180 | $315 | $495 | 0% |
| St. John's, NL | $180 | $315 | $495 | 0% |
| Quebec City, QC | $176 | $308 | $484 | -2% |
| Laval, QC | $184 | $322 | $506 | +2% |
| Halifax, NS | $184 | $322 | $506 | +2% |
Frequently Asked Questions
How much does home addition cost in London?
In London, home addition typically costs between $180 and $495 per sq ft in 2026. The average homeowner pays around $315 per sq ft.
What factors affect home addition costs in London?
Key factors include: Addition type (bump-out, second storey, lateral), Foundation requirements, Roof tie-in complexity, Municipal zoning restrictions, Matching existing finishes, Engineering and architectural fees. London prices are below the Canadian average due to local labour and material costs.
Do I need a permit for home addition in London?
Yes, home addition typically requires a building permit in London. Contact your local building department for specific requirements and fees.
How do I save money on home addition in London?
Get at least 3 quotes from licensed contractors. Foundation work best started in spring after frost Consider bundling multiple projects. Ask about off-season discounts and whether materials can be sourced more affordably.
How do I find a good contractor in London?
Check reviews on HomeStars, Google, and the Better Business Bureau. Verify licenses and insurance. Ask for references from recent local projects. Never pay more than 10-15% upfront.