Ontario cost guide
Home Addition Cost in London
Use a London planning range that reflects project size, scope, finish level and a local market factor. Balanced Ontario pricing across renovation categories.
Local planning factor
100%
of the national baseline before project-specific adjustments.
Tax shown separately
HST (13%)
Typical Home Addition planning ranges in London
| Scope | Planning range before tax |
|---|---|
| Planning / smaller scope | $75,000 – $127,600 |
| Typical renovation | $75,100 – $150,200 |
| Complex or premium scope | $112,600 – $225,200 |
These ranges are planning estimates only. Existing conditions, access, permits, material availability and contractor-specific scopes can move the final price.
What can change a Home Addition budget here?
Foundation and structural design
Zoning and permits
Mechanical system extensions
Architectural and engineering scope
Build your project estimate
We will calculate your range before tax and show local tax separately.
Start estimateWhen local contractor coverage is active, your request can be shared with up to five suitable contractors. Otherwise, you can join the market-availability waitlist.
Frequently asked questions
RenoCost uses local planning factors, project size, scope and finish level to produce a starting budget range. Final contractor pricing depends on site conditions, permit needs, access and material choices.
The main range is shown before tax. We also show a separate estimate using HST (13%) so you can plan a more complete budget.
Yes. Submit your project details after the estimate. If local contractor coverage is active, your request can be matched with up to five suitable contractors. If coverage is still expanding, we save your request and notify you when availability improves.
No. It is a planning estimate only. A formal contractor quote requires a review of the property, scope, selections and local requirements.