Looking to cost out a single story addition to a 2 story home, no basement required, approx. 20 x 20. Making space for living area, master bedroom with walk-in closet.
In answer to your question, the price in Toronto is roughly $220 per sq. ft.
Prices will be slightly lower in London.
Additional costs will be design, engineering, building permit and fees, and , possible Committee of Adjustment to receive exceptions where you are in abeyance of zoning regulations.
If your back yard has restricted access, this will increase costs.
Look for a reputable design/builder that can steer you through the entire process and has done it many times before.
Check his references.
If it is a basic addition, and by that I mean no kitchen. You are looking at about 85,000.00 to 90,000.00.
As mentioned in the previous post, things like access can drastically effect the costs.
There are many variables, but that is a ball park.
Good luck with it.
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