Renovations and your appraised value: what actually adds equity
Appraisers value a renovation by what similar renovated homes sell for, not by what it cost, so cost and added value rarely match. Work that adds living space or a legal unit tends to add the most. Since January 15, 2025, adding a secondary suite also unlocks an insured refinance of up to 90% of the finished value, compared with 80% for other renovations.
How appraisers treat renovations
Appraisers following CUSPAP use comparable sales: a renovated kitchen adds what buyers in your area pay for renovated kitchens. Over-improving for the street rarely appraises. For work not yet done, lenders can appraise "as complete" from plans and quotes.
Adding a suite: the 90% refinance
SOR/2012-281 s. 6.1 allows an insured loan to add housing units of up to 90% of the value after completion, with the added amount capped at the cost of the work; the Department of Finance adds a $2,000,000 limit, up to 30-year amortization and at most 4 units, with you or a close relative living in one and no short-term rental. Example: a home worth $1,100,000 once a $240,000 suite is built, with a $600,000 mortgage, could support up to $840,000 in total; a conventional refinance on the same finished value would stop at $880,000.
Paperwork that protects the value
- Permits and final inspections.
- Invoices with dates and scope.
- Before and after photos.
Renovations and your assessment
Assessors update for physical changes on their own timetable; check the next notice's property facts. If the new assessment overshoots similar renovated homes, you can appeal.
Frequently asked questions
Does a renovation increase my property tax?
It can. Assessors pick up permitted work and physical changes (Nova Scotia includes changes made by December 1 in the next roll). A higher assessment means a larger share of tax.
Primary sources
- Appraisal Institute of Canada — What appraisers do (AACI, CRA designations; three approaches). Checked .
- Justice Laws — Eligible Mortgage Loan Regulations (SOR/2012-281), s. 6.1: insured loans to add housing units (effective January 15, 2025). Checked .
- Department of Finance Canada — Mortgage insurance rule changes to help homeowners add secondary suites (effective January 15, 2025). Checked .
- Department of Finance Canada — Fall Economic Statement: refinancing up to 90% to build secondary suites (effective December 10, 2024). Checked .
- Justice Laws — Bank Act, s. 418: 80% limit on uninsured residential loans (including refinances) (effective September 1, 2026). Checked .