Drywall Built for Toronto Basements
Toronto Drywall Pro is a licensed, bonded, and insured drywall contractor based in Toronto, finishing basements in detached homes, semi-detached houses, and townhouses across the GTA since 2002. Toronto basements are humid, prone to seasonal moisture swings, and code-regulated for fire and acoustic separation from the living space above. Standard 1/2-inch drywall doesn’t belong below grade in this climate. Within a few years, paper-faced panels in a humid basement will absorb moisture and start to grow mold on the back side.
Our residential drywall installation for basements uses moisture-resistant Green Board (and paperless Purple Board for higher mold resistance) below grade and around any mechanicals. We coordinate insulation and vapour-barrier prep with your insulation contractor, install 5/8-inch Type X at the basement-stair separation as Ontario Building Code requires, and finish to Level 4 ready for primer. Level 5 is available for basement apartments and home offices that need a flawless painted surface.
How Much Does Basement Drywall Cost in Toronto? (2026)
- Basement drywall installation (per square foot, installed and finished): $3 to $6
- Moisture-resistant Green Board premium over standard: 20 to 30 percent
- Paperless Purple Board premium for high-mold-risk areas: 35 to 50 percent
- Type X fire separation at basement stair (typical): $800 to $1,800
- Bulkhead framing and finishing (per linear foot): $35 to $70
- Full 800 to 1,200 sq ft basement (framing through Level 4 finish): $4,500 to $9,500
- Legal-suite basement drywall (Peel Region permit-ready): Quoted per project from drawings
- Vapour barrier and insulation coordination: Coordinated with insulation contractor
Most Toronto basement drywall jobs run 7 to 14 working days for framing through paint-ready handover.
Green Board, Purple Board or Type X: Choosing the Right Panel
Green Board. Moisture-resistant paper-faced drywall with green coating and treated paper. Standard for any wall below grade or anywhere humidity will be elevated (bathroom walls, behind sinks, around basement mechanical rooms). Roughly 20 to 30 percent more expensive than standard drywall.
Purple Board. Paperless drywall with a fibreglass mat in place of paper. Much higher mold resistance because mold needs paper to colonize. We recommend Purple Board for basements with known historical moisture issues, such as older rubble and block foundations in pre-war Toronto homes, or any below-grade work where the homeowner specifically wants maximum mold protection.
5/8-inch Type X. Fire-rated drywall, required by Ontario Building Code at the basement-stair separation when the basement is finished and living above is occupied. This is the catch many basement-finishing homeowners don’t know about until inspection. We also use 5/8-inch board on basement ceilings where a fire separation is required (secondary suites) or where joists are spaced 24 inches on centre, because it resists sagging between framing members.
Standard 1/2-inch. Only used above grade and away from any moisture source. Not for basement perimeter walls. On a conventional basement rec room ceiling with joists at 16 inches on centre, 1/2-inch ceiling board is the standard choice.
What Does Ontario Building Code Require in a Finished Basement?
A finished basement in Toronto or anywhere in Ontario needs to meet several specific requirements:
- Vapour barrier continuous on the warm side of insulation (between insulation and drywall in our climate).
- Insulation to R-value compliance per Section 9.36 of Ontario Building Code (typically R-20 in basement walls, R-31 in floor over basement when applicable), using batt, mineral wool, or rigid foam insulation depending on the wall assembly.
- Type X fire separation at the basement stair where it meets the living floor above.
- Moisture-resistant panels below grade.
- Egress windows to code for any sleeping room.
We coordinate with your insulation contractor on items 1 and 2, install items 3 and 4 ourselves, and reference items 1, 2, and 5 in the framing inspection.
Bulkheads, Soffits, and HVAC Ceiling Work
Most Toronto basements have HVAC ducts, beams, and plumbing running below the floor joists. Hiding them takes bulkhead and soffit framing, and that framing has to be drywalled to match the rest of the ceiling.
We frame and finish bulkheads as part of our basement scope. Common bulkhead locations include:
- Along the perimeter under HVAC supply runs
- Around the main beam (often spanning the long axis of the basement)
- Below plumbing drains and waste lines
- Around the panel and water-heater area
A clean basement ceiling depends entirely on whether the bulkhead corners are square, mitered properly, and finished to the same Level 4 standard as the flat ceiling. Toronto Drywall Pro uses one in-house crew for metal stud framing, hanging, drywall taping, and mudding, so the bulkheads, corner bead, and joint compound coats are handled by the same people who framed them. We don’t cut corners on bulkhead work because every visitor’s eye lands on those joints.
Legal Secondary Suites in Brampton, Mississauga and Toronto
Legal-suite basement conversion is one of the most common basement-finishing scopes we see, especially in Brampton and Mississauga detached and semi-detached homes, and in Scarborough bungalows with side-door entrances. A legal secondary suite needs:
- All Type X requirements at the stair separation and around mechanical
- Soundproofing between suites (often a separate acoustic-rated assembly)
- Code-compliant egress for any bedroom
- Proper smoke and CO alarms (your electrician handles this)
We coordinate with Peel Region permit conventions and inspection timing, and with City of Toronto building inspections for suites inside the city.
Serving Homeowners Across the GTA
Across the Greater Toronto Area, with highest volume in Mississauga, Brampton, and Oakville suburban detached homes. Inside the city, we regularly finish basements in North York backsplits and Etobicoke post-war bungalows. We work secondary GTA cities including Vaughan and Markham with 1-2 day scheduling lead.
How We Compare
| Feature | Typical Provider | Toronto Drywall Pro |
|---|---|---|
| Below-grade panels | Standard 1/2-inch board throughout | Green Board or Purple Board on every below-grade wall |
| Crew | Framing, boarding, and taping split across subcontractors | One in-house crew from metal stud framing to Level 4 finish |
| Fire separation | Addressed after a failed inspection | 5/8-inch Type X at the stair separation on every finished basement |
| Experience | Varies | Drywall-only specialist since 2002 |
| Credentials | Varies | Licensed, bonded, and insured |
| Estimate | Lump-sum number | Free on-site estimate with line-item breakdown |
Before You Book: What to Expect
Basement finishing drywall is the process of framing, insulating, and cladding below-grade walls and ceilings with gypsum board to convert an unfinished concrete basement into livable space. It differs from above-grade drywall in that moisture management is critical: below-grade walls require a vapour control layer, moisture-resistant Green Board or Purple Board panels, and proper drainage plane details to prevent mold behind finished walls. Ontario Building Code Part 9 sets minimum insulation requirements and egress window sizing for basement bedrooms. Done correctly, a finished Toronto basement adds 800 to 1,200 sq ft of livable space to a typical detached home.
What Does Basement Finishing Drywall Include?
- Metal stud (steel stud) framing or wood framing on a pressure-treated bottom plate, set away from the foundation wall with a drainage gap
- Vapour control behind all below-grade wall framing (6-mil poly or rigid foam insulation, depending on the wall assembly)
- Batt or mineral wool insulation in wall cavities to meet OBC minimum R-values
- Moisture-resistant Green Board or Purple Board on all below-grade walls
- Standard 1/2-inch drywall on interior partition walls and ceilings
- Drywall taping and mudding with three coats of joint compound, sanded to a Level 4 handover
What Changes the Final Price?
Basement drywall in Toronto runs $3 to $6 per square foot installed and finished in 2026, depending on ceiling height, partition layout, and panel type. A typical 800 to 1,200 sq ft Toronto basement runs $4,500 to $9,500 for full drywall installation including framing and moisture-resistant panels. Finishing only (no framing) runs lower. Every quote starts with a free on-site estimate and a line-item breakdown.
Who Needs Drywall Basement Finishing?
Homeowners converting an unfinished basement into a rental suite, home office, gym, or playroom. Investors adding legal secondary units to increase rental yield. Builders finishing basement suites in new construction townhomes and detached homes across the GTA. Anyone tired of looking at exposed joists and wiring in a basement that could be productive living space.
