Stittsville, west Ottawa
Home additions in Stittsville
Detached homes on Stittsville's larger lots have room for a rear addition or a sunroom, subject to zoning setbacks. Lots backing onto Poole Creek, Feedmill Creek or a wetland can need Mississippi Valley Conservation Authority approval before the building permit.
Typical rear or side addition, one storey in Stittsville, with HST $122,000 to $163,600 $305 to $409 per sq ft for 400 sq ft
AI imageWhat additions cost in Stittsville
Typical project totals and the price per square foot, with HST, by type of job and finish level, priced for suburban Ottawa. Choose a row to open it in the estimator with Stittsville prices.
| Type of addition | Economy | Mid-range | Premium |
|---|---|---|---|
| Rear or side addition, one storey400 sq ft | $105,700 to $141,600$264 to $354 per sq ft | $122,000 to $163,600$305 to $409 per sq ft | $153,800 to $206,200$385 to $516 per sq ft |
| Second storey700 sq ft | $150,600 to $202,000$215 to $289 per sq ft | $178,200 to $239,000$255 to $341 per sq ft | $233,500 to $313,100$334 to $447 per sq ft |
| Bump-out100 sq ft | $58,100 to $77,900$581 to $779 per sq ft | $65,900 to $88,300$659 to $883 per sq ft | $78,500 to $105,300$785 to $1,053 per sq ft |
Prices are estimates based on published Ottawa and Ontario price guides, checked October 2026. They are not an offer. A firm written quote follows a site visit. Prices for Stittsville include about 2% over central Ottawa for travel and delivery.
Homes in Stittsville
What the local housing means for additions.
The village was founded in the 1850s and rebuilt around the railway after an 1870 fire. Its Main Street core still has 19th-century buildings, and the City adopted a design plan for it in 2015. The suburban subdivisions around it date from the mid-1980s onward, and population growth suggests the largest share was built since 2000.
- Most Stittsville homes appear to be under 40 years old, so original builder-grade kitchens, bathrooms and basements are a typical starting point.
- Older houses near Main Street can need deeper kitchen, bathroom and addition work than the suburban homes around them.
- About 30 percent of townhomes are rented, which supports basement suites and rental-ready updates.
Permits and approvals
What to check in Stittsville before additions work starts. Rules change, so we confirm what applies to your address.
Mississippi Valley Conservation Authority
Poole Creek and Feedmill Creek are tributaries of the Carp River, managed by the Mississippi Valley Conservation Authority. Poole Creek's headwaters are in a provincially significant wetland near Highway 7 and Hazeldean Road. Additions and alterations in a regulated area need an MVCA permit before the building permit, and MVCA approved new Carp tributary hazard maps in July 2026.
Main Street
No heritage conservation district covers Stittsville, but the Stittsville Main Street Community Design Plan guides the corridor, and at least one building on it, Green's Hotel, is individually designated. Exterior work on a designated building needs heritage approval and loses the usual permit exemptions.
Building permits
The City generally requires a building permit to finish a basement, move or remove walls, alter plumbing, add or enlarge windows and doors, and build an addition. Replacing kitchen cabinets without moving plumbing fixtures usually does not need one. Electrical work is inspected separately by the Electrical Safety Authority.
Trees
On urban lots of one hectare or less, the City's Tree Protection By-law requires a permit to remove or injure a distinctive tree, which the current by-law sets at 30 cm or more across at chest height. Footings and trenches near big trees are planned around their roots. The thresholds have changed in recent years, so we check the by-law in force.
Zoning
Additions and larger decks have to meet the zoning setbacks, height and lot coverage for your lot. Most of Ottawa's new Zoning By-law 2026-50 is in force (the parts not under appeal took effect from March 2026), and where a provision is still under appeal the stricter of the old and new rules applies, so we check the rules for your address before design starts.
A sample quote
A typical Ottawa home addition, priced task by task. Open it, then change it to suit a house in Stittsville.
Good to know
How much does a home addition cost in Stittsville?
A mid-range rear or side addition, one storey of about 400 sq ft typically comes to $122,000 to $163,600 with HST, based on published Ottawa and Ontario price guides checked October 2026. With economy finishes the same job is about $105,700 to $141,600; with premium finishes, about $153,800 to $206,200. Size, the state of the house and what you add all move the number, so use the estimator for your own project. A firm quote follows a site visit.
My house backs onto Poole Creek. What does that change?
If your lot is in the Mississippi Valley Conservation Authority's regulated area, an addition or alteration needs an MVCA permit before the City building permit, which MVCA says takes about 30 days. We confirm decks and interior work with MVCA, and check the mapping for your address.
Do you work on the older houses near Main Street?
Yes. Older houses there usually need more investigation before a renovation, so the estimator's older-house allowance is worth switching on, and we check for designated buildings before exterior work.
Planning a home addition in Stittsville?
Price it in the estimator with Stittsville rates, then send it to us. We confirm the numbers on a site visit and follow up with a written quote.