Drywalling a basement in Ottawa costs roughly $6,500 to $13,000 for a typical 800–1,000 square foot space in 2026 — that is about $2.60 to $4.25 per square foot of board supplied, hung, taped and finished to Level 4. If you also need framing and insulation before the board goes up, add approximately $9 to $18 per square foot of floor area, bringing a 900 sq ft basement to roughly $17,000–$29,000 for framed, insulated and drywalled walls and ceiling. Basements cost more per square foot than upper floors because of low headroom, concrete-fastened framing, bulkheads over ducts and beams, and the ...
Basement drywall is priced on board area, which in a basement usually works out to about 2.5 to 3 times the floor area once perimeter walls, partitions, the ceiling and bulkheads are counted. For a 600 sq ft basement — common in older Ottawa semis and townhomes — expect roughly $4,500–$8,500 for drywall only. An 800 sq ft basement typically runs $6,000–$11,000, a 1,000 sq ft basement $7,500–$13,000, and a large 1,400 sq ft suburban basement in Barrhaven or Orléans $10,500–$18,000. Those ranges assume standard 7'6" to 8' ceilings, straightforward rectangular layouts and Level 4 finishing. Every partition wall for a bathroom, bedroom, storage room or mechanical enclosure adds board area on both faces, so a heavily divided basement can cost 30–40% more than an open recreation-room layout of the same floor size. Ask contractors to state the board square footage they measured so you can sanity-check their number against your plan.
A drywall basement ceiling costs roughly $4.00–$6.00 per square foot finished and looks best, but buries access to plumbing and wiring. A suspended acoustic ceiling runs about $6–$11 per square foot installed and keeps mechanical access open — a genuine advantage under older Ottawa plumbing.
Drywall is the last step in the wall assembly, and in Ottawa basements the layers underneath drive most of the total cost. A code-compliant basement wall typically includes a moisture break against the concrete, rigid foam or spray foam continuous insulation, a 2x4 stud wall, batt insulation where used, and an air/vapour control layer detailed correctly for a below-grade wall. In 2026 Ottawa pricing, framing runs about $4–$8 per square foot of wall, rigid foam $2.50–$5 per square foot, and closed-cell spray foam $4.50–$8 per square foot of wall area. Electrical rough-in for a finished basement typically costs $3,500–$8,000, and plumbing rough-in for a basement bathroom $4,000–$10,000. Every one of these must be inspected before drywall closes the walls. Any contractor who offers to board over un-inspected framing, wiring or plumbing is exposing you to having the drywall torn back off — a completely avoidable and expensive mistake.
Basements have specific material rules that affect both cost and safety. Moisture- and mould-resistant board is standard in basement bathrooms, laundry rooms and along any wall with a history of dampness; it costs about $10–$15 more per sheet than regular board and is cheap insurance below grade. Where a basement includes a furnace or mechanical room, and in any shared wall or ceiling separating a secondary dwelling unit, the Ontario Building Code requires rated assemblies typically built with 5/8" Type X fire-rated board — often with resilient channel and specific fastener patterns that must be followed exactly to maintain the rating. Sound control is a common upgrade: adding a second layer of board with a damping compound, or resilient channel with mineral wool in the joist bays, adds roughly $2.50–$5.00 per square foot but makes a basement bedroom or home theatre far more livable. Never board over active water intrusion — solve the source first, or the drywall will fail.
If you are creating a secondary dwelling unit, fire separation, egress windows and smoke-alarm interconnection requirements apply, and inspections are stricter. Those requirements change the drywall spec and can add several thousand dollars, so establish the intended use before pricing the job.
Finishing a basement in Ottawa requires a building permit whenever you are framing new walls, adding a bathroom, altering plumbing or electrical, or creating a new bedroom or dwelling unit. Permit fees for a basement finish typically fall in the several-hundred-dollar range depending on area, and the City reviews your layout for ceiling height, egress, and fire separations. Electrical work is governed separately by the Electrical Safety Authority, which requires its own notification and inspection regardless of the building permit. The practical sequence is: permit issued, framing complete, plumbing rough-in inspected, ESA electrical rough-in inspected, insulation and vapour barrier inspected, and only then drywall. Booking drywall delivery before those sign-offs is the most common scheduling error in Ottawa basement projects. Allow two to five weeks from application to permit issuance depending on season and complexity, and build inspection wait times into your project schedule rather than assuming same-week availability.
There are legitimate ways to trim basement drywall costs. Keeping the layout open and minimizing partition walls reduces board area directly. Choosing a suspended ceiling in the mechanical zone while drywalling the main recreation area gets you a clean look plus access where it matters. Doing your own demolition of an old, damaged basement finish can save $1,200–$3,000 in labour and disposal — Ottawa junk-removal bins run about $350–$600. Scheduling in late fall or winter, the slower season for Ottawa drywall crews, can shave 5–10% off labour quotes. What you should not cut: the vapour and air control detailing, moisture-resistant board in wet areas, fire-rated assemblies, or the inspections. Homeowners who hang their own board to save labour frequently find that taping and finishing to a professional standard is the hard part; hiring out taping while hanging yourself is often the better trade-off, and most Ottawa finishers will quote that scope.
In 2026, drywalling a typical 800–1,000 square foot Ottawa basement costs about $6,500–$13,000 for supply, hanging, taping and Level 4 finishing. That works out to roughly $2.60–$4.25 per square foot of board area, which is usually 2.5 to 3 times the floor area.
Framing, insulation and drywall together run about $9–$18 per square foot of basement floor area in Ottawa, so a 900 square foot basement typically lands between $17,000 and $29,000 for walls and ceiling. Electrical, plumbing, flooring, doors and trim are additional.
You need a City of Ottawa building permit if you are framing new walls, adding a bathroom, creating a bedroom or dwelling unit, or altering plumbing or electrical. Electrical work also requires a separate Electrical Safety Authority notification and inspection. Rough-in inspections must pass before drywall is installed.
Use moisture- and mould-resistant board in bathrooms, laundry areas and any wall prone to dampness, and 5/8" Type X fire-rated board where the code requires a rated assembly, such as around a furnace room or separating a secondary dwelling unit. Regular board is acceptable in dry living areas.
Drywall costs about $4.00–$6.00 per square foot finished and gives the cleanest look, but it seals off pipes and wiring. A suspended acoustic ceiling costs about $6–$11 per square foot and keeps mechanical access open, which is often worth it in older Ottawa homes.
For an average Ottawa basement, hanging takes two to three days and taping, mudding and sanding adds another four to seven days because each compound coat must dry fully. Plan on roughly one and a half to two weeks from first sheet to paint-ready, longer in humid conditions.