Is building an addition more affordable in Ottawa than buying a bigger house right now?
Is building an addition more affordable in Ottawa than buying a bigger house right now?
Many homeowners who need more room ask whether it makes more financial sense to build an addition or sell and buy a bigger house. There is no single answer, and any claim that one option is a fixed percentage cheaper should be treated with caution. The right choice depends on your lot, your house and the prices in your part of the city, so it is worth running the numbers for your own situation.
The cost of building. As broad perspective, a ground-floor family room addition can range from roughly $100,000 to $160,000 depending on size, foundation, finishes and whether plumbing is involved. Treat that as perspective, not a quote. Itemized quotes from a few contractors give you the real figure for your house.
The cost of moving. Buying a larger home means paying the price difference between your current house and the new one, plus the costs that come with every move: Ontario land transfer tax, legal fees, a home inspection, real estate commissions on your sale, and moving costs. A real estate agent and a lawyer can estimate these for the price range you are considering.
What favours building. Your lot is already yours, you keep your neighbourhood and school catchment, and you avoid bidding against other buyers. You can also design the space around how your family actually lives, which a resale house rarely offers.
What favours buying. Building may not make sense if your lot can't fit an addition within your zoning's setbacks, height and lot coverage, if your foundation can't carry the load without costly work, or if the property is designated heritage or in a Heritage Conservation District, where the City must approve the addition. A minor variance from the Committee of Adjustment is possible (the 2026 urban fee totals $3,759), but it adds time and uncertainty to a marginal project.
Resale. How much of an addition's cost you get back at sale depends on the house, the street and the market, and there is no reliable figure to plan on. Build for your own use first.
If you build, make sure the project is permitted. The City's permit list names one- and two-storey additions, and the owner and the contractor are equally responsible for making sure one is obtained. Ask each contractor whether they have WSIB coverage or are exempt. You can browse addition contractors in the Ottawa Construction Network directory at justynrookcontracting.com and compare quotes for your property.
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