Nepean, west Ottawa
Secondary suites in Nepean
A full bungalow basement is one of the easier places to plan a secondary suite, as long as the 1.95 m ceiling height, a separate entrance and the exits work. The City puts no size limit on basement suites, and the work needs a building permit.
Typical secondary suite in Nepean, with HST $102,900 to $138,000 $147 to $197 per sq ft for 700 sq ft
AI imageWhat secondary suites cost in Nepean
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 Nepean prices.
| Typical size | Basic | Mid-range | Premium |
|---|---|---|---|
| Secondary suite700 sq ft | $83,800 to $112,400$120 to $161 per sq ft | $102,900 to $138,000$147 to $197 per sq ft | $131,500 to $176,400$188 to $252 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 Nepean
What the local housing means for secondary suites.
Lynwood Village in Bells Corners, more than 1,700 homes, mostly bungalows, was built from the late 1950s to 1966. Crestview is mainly 1950s and early 1960s bungalows, Parkwood Hills was built from 1959 to 1972, Westcliffe Estates from 1969 with later phases into the 1990s, and Centrepointe from 1984, mostly townhomes with about 1,000 detached houses.
- Kitchens and bathrooms in the 1950s to 1970s neighbourhoods are often original or on their second round, so wiring and plumbing are part of the job.
- Bungalow basements often cover the whole footprint, which can suit a family room or a suite where the ceiling height and exits work.
- Owners of compact bungalows often add space with a rear addition rather than moving.
Permits and approvals
What to check in Nepean before secondary suites work starts. Rules change, so we confirm what applies to your address.
Rideau Valley Conservation Authority
Where a lot is near a creek or valley inside the Rideau Valley Conservation Authority's regulated area, an addition or a new unit needs RVCA approval. 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.
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.
Secondary suites
A suite inside an existing house needs a building permit and has to meet the Building Code for ceiling height, exits, fire separation, windows and alarms, with electrical inspected separately. Basement suites have no size limit, the suite needs its own entrance (not a new door in the front wall), and new parking cannot go in the front yard. On lots with City water and sewer, current rules allow more than one additional unit on most residential lots, so we check what your lot can hold.
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 secondary suite, priced task by task. Open it, then change it to suit a house in Nepean.
Good to know
How much does a secondary suite cost in Nepean?
A mid-range secondary suite of about 700 sq ft typically comes to $102,900 to $138,000 with HST, based on published Ottawa and Ontario price guides checked October 2026. With basic finishes the same job is about $83,800 to $112,400; with premium finishes, about $131,500 to $176,400. 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.
Why does the estimator price Nepean at central Ottawa rates?
Bells Corners, Crestview, Parkwood Hills and Centrepointe are inside or surrounded by the Greenbelt, so travel and delivery cost the same as for central Ottawa.
Planning a secondary suite in Nepean?
Price it in the estimator with Nepean rates, then send it to us. We confirm the numbers on a site visit and follow up with a written quote.