Three checks before we draw a single wall.
The rear yard setback for your zone sets how deep the addition can go. We measure your lot before proposing a footprint.
Some zones also limit how much of the lot buildings can cover. An addition can meet setback and still exceed coverage, so we check both.
Footings here are commonly founded to about 1.5 m to get below frost depth, which sets the excavation scope before framing starts.
Ottawa’s new Zoning By-law (2026-50) sets the rear yard setback in most urban neighbourhood zones at 25 percent of lot depth, never less than 6 m. That number decides how deep a rear addition or home extension can go before it needs a variance. We measure your specific lot and confirm the number before a design is worth paying for, rather than drawing a room and finding out later that it does not fit.
A single-room project is priced as a full-project total; a larger extension is priced per square foot.
$50,000-$100,000
A bedroom, office, or similar single new room
Design, permit, foundation, framing and finishing included
Full-project total, not a per-square-foot estimate
Sized to your confirmed rear-yard setback
$325-$475 per sq ft
Multi-room rear or side extension
Structural and foundation work priced by scope
Matched roofline and exterior finish
Itemised quote after a measured site visit
This Kanata project added a ground-floor room across the back of a two-storey home. The new walls are framed the full width of the house, with door and window openings in place, and the new foundation is wrapped and protected along the outside.
We confirm your rear-yard setback and lot coverage against the Zoning By-law before proposing a footprint.
Drawings sized to the confirmed setback, with egress and structural requirements built in from the start.
Permit application submitted, then footings excavated to clear local frost depth.
Framing, exterior finish matched to the existing house, and interior finishing to completion.
Reviews given to us directly by clients.
Home Additions Experts Ottawa built a beautiful family-room addition for our home. The team communicated clearly, stayed organized, and made sure the new space blended perfectly with the original house.
We hired them to add an extra bedroom and bathroom to our Ottawa home. The workmanship was excellent, and the team kept us informed throughout the entire project. We are very pleased with the finished space.
The team managed our home addition professionally from the initial planning stage through construction. They answered our questions, respected our property, and delivered a result that exceeded our expectations.
Ask to see your rear yard measurement compared against the setback rule for your zone, not a general statement that 'it should fit.'
Footings here are commonly founded to about 1.5 m to clear frost. Ask what depth is specified and why, especially if your lot has known drainage issues.
If you want the flexibility to use the new room as a bedroom later, ask whether it's being designed with a code-sized egress window and closet now, since retrofitting one later is far more disruptive.
Ask for the specific permit fee estimate for your project, in writing, rather than a rough guess.
As deep as the rear yard setback shown above allows for your lot depth and zone. We measure your property and give you the real number rather than a rule of thumb.
Often yes, if the new room does not need a bathroom. A bedroom addition still needs a code-sized egress window under the Ontario Building Code regardless of plumbing.
We use the terms for the same kind of project: new ground-floor square footage added to the existing house, whether it is a single room or a multi-room extension. Pricing shifts from a full-project total to a per-square-foot rate as the project gets larger.
Yes, design and permit work is part of the project and priced on its own line in your quote.