Markham, ON

What a home addition actually costs in Markham

Not an estimate. 44 building permits, as declared to the city.

Typical declared cost

$59,950

Most projects fall between$25,000 and $150,000
Permits in this sample44
Permits issued between2025-08-15 and 2026-07-24

Every number here comes from City of Markham open data. When someone applies for a building permit they must declare what the work will cost, and the city publishes it. That is a different thing from a quote, and worth being precise about: a declared value is what the applicant told the city, usually before the final invoice exists. It is the closest honest answer available, and it is not marketing.

Most cost pages on the internet are written by someone who wants the contract. This one is arithmetic on a public register, and you can check it yourself — the source is here.

What would $59,950 of work cost you to carry?

That depends almost entirely on one thing — when your mortgage comes up for renewal. Tell us the month and you get the number. Nothing about your income, your balance or your credit is asked for, because none of it is needed to work this out.

Marjan Alaeddini, Mortgage Alliance, Licence #10530