Gloucester, east Ottawa
Home additions in Gloucester
Blossom Park's 1950s bungalows on lots of about 150 by 100 feet have more room for a rear addition than most Ottawa lots. Elsewhere, lots next to the Greenbelt or a creek valley need the survey and any conservation authority rules checked first.
Typical rear or side addition, one storey in Gloucester, with HST $119,800 to $160,700 $300 to $402 per sq ft for 400 sq ft
AI imageWhat additions cost in Gloucester
Typical project totals and the price per square foot, with HST, by type of job and finish level, priced for central Ottawa. Choose a row to open it in the estimator with Gloucester prices.
| Type of addition | Economy | Mid-range | Premium |
|---|---|---|---|
| Rear or side addition, one storey400 sq ft | $103,600 to $139,000$259 to $348 per sq ft | $119,800 to $160,700$300 to $402 per sq ft | $151,000 to $202,400$378 to $506 per sq ft |
| Second storey700 sq ft | $147,900 to $198,300$211 to $283 per sq ft | $174,900 to $234,600$250 to $335 per sq ft | $228,900 to $306,900$327 to $438 per sq ft |
| Bump-out100 sq ft | $56,700 to $76,200$567 to $762 per sq ft | $64,500 to $86,600$645 to $866 per sq ft | $77,500 to $103,800$775 to $1,038 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.
Homes in Gloucester
What the local housing means for additions.
Blossom Park's first lots were sold from 1947, and its 1950s core is mostly bungalows on lots of about 150 by 100 feet. Blackburn Hamlet, a planned community surrounded by Greenbelt land, had its first residents in 1967, and most of its homes date from the 1960s and 1970s. Beacon Hill was built in the 1960s and 1970s and Carson Grove in the early 1970s.
- Kitchens and bathrooms in Blackburn Hamlet, Beacon Hill and Carson Grove are often due for a full redo.
- Blossom Park's large bungalow lots leave room for rear additions.
- Basement suites, and bringing older suites up to code, are worth asking about.
Permits and approvals
What to check in Gloucester before additions work starts. Rules change, so we confirm what applies to your address.
Rideau Valley Conservation Authority
Green's Creek and the other east-end creeks are in the Rideau Valley Conservation Authority's area, and their valleys, slopes and floodplains are regulated. RVCA treats work inside the existing walls, roof and foundation that does not change the use as generally not needing its approval; enlarging the house, changing its use or adding a unit does.
Next to the Greenbelt
Blackburn Hamlet is surrounded by Greenbelt land, Beacon Hill and Pineview have it on their east side and it forms the southern edge of Blossom Park. The National Capital Commission controls the Greenbelt itself, so decks, additions and fences stay within your surveyed lot lines.
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. Houses of this age often have plaster, older wiring or materials that need testing before they come out; the estimator's older-house allowance is a cushion for that.
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 Gloucester.
Good to know
How much does a home addition cost in Gloucester?
A mid-range rear or side addition, one storey of about 400 sq ft typically comes to $119,800 to $160,700 with HST, based on published Ottawa and Ontario price guides checked October 2026. With economy finishes the same job is about $103,600 to $139,000; with premium finishes, about $151,000 to $202,400. 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.
Can I build a deck that backs onto the Greenbelt?
Generally yes, within your own lot and the zoning setbacks. The Greenbelt is controlled by the National Capital Commission, so the deck, stairs and any fence stay inside your surveyed lot lines, and a raised deck needs a City building permit.
Why does the estimator price Gloucester at central Ottawa rates?
Blackburn Hamlet, Beacon Hill, Carson Grove and Blossom Park are inside or surrounded by the Greenbelt, so travel and delivery cost the same as for central Ottawa.
Planning a home addition in Gloucester?
Price it in the estimator with Gloucester rates, then send it to us. We confirm the numbers on a site visit and follow up with a written quote.