How much more does soundproof drywall installation cost compared to standard drywall per square foot in the GTA?

Soundproof drywall installation in the GTA costs roughly $3.00-$6.00 more per square foot than standard drywall installation, depending on the specific soundproofing assembly chosen. Standard drywall installation (hanging, taping, and Level 4 finishing) runs about $4.50-$7.50 per square foot in the GTA, while a soundproofed wall assembly comes in at $7.50-$14.00 per square foot — so you're looking at anywhere from a 60% to 100% premium over standard.

The cost difference comes from three sources: more expensive materials, additional labour, and supplementary components that a standard drywall job doesn't require. Let's break down the most common soundproofing approaches and their per-square-foot premium over standard installation.

Green Glue and double drywall is the most popular entry-level soundproofing upgrade. You're adding a second layer of 5/8-inch drywall ($18-$26 per 4x8 sheet, working out to roughly $0.60-$0.80 per square foot) plus Green Glue compound (two tubes per sheet at $18-$25 each, adding approximately $1.10-$1.60 per square foot). Labour to hang the second layer adds about $1.00-$1.50 per square foot. Total premium: $2.70-$3.90 per square foot over a single-layer standard installation. This brings the all-in installed cost to roughly $7.00-$11.00 per square foot.

Resilient channel with double drywall and Green Glue adds the decoupling element for significantly better performance. Resilient channel material costs about $0.40-$0.70 per square foot, and installation adds another $0.50-$1.00 per square foot in labour. Combined with the double drywall and Green Glue costs above, the total premium over standard is $3.60-$5.60 per square foot, putting the all-in cost at $8.00-$13.00 per square foot.

QuietRock specialty drywall (a single board with built-in viscoelastic damping) offers a streamlined alternative. A 4x8 sheet of QuietRock runs $55-$90 versus $14-$20 for standard 1/2-inch drywall — roughly $1.30-$2.20 more per square foot in materials alone. Because it's a single layer, labour is similar to standard drywall hanging, though the boards are heavier and require more care. Total premium: $1.50-$3.00 per square foot over standard, making it the least expensive per square foot but also providing less sound isolation than the double-drywall assemblies. All-in cost: $6.00-$10.00 per square foot.

Beyond the drywall itself, a proper soundproofing project includes costs that don't exist in a standard drywall job. Acoustical caulk for sealing all perimeter joints and penetrations adds $0.30-$0.60 per square foot of treated wall. Mineral wool insulation in the wall cavity (if upgrading from fibreglass or filling previously empty cavities) adds $1.20-$1.80 per square foot. Electrical outlet extensions to accommodate the additional wall thickness run $75-$150 per outlet. Acoustical putty pads for sealing around electrical boxes add $5-$10 per box.

To put this in real-dollar terms for common GTA projects: soundproofing a single party wall in a Toronto semi-detached (approximately 120-150 square feet) runs $1,200-$2,500 more than if you were just replacing the drywall with standard board. Soundproofing an entire room (four walls and ceiling, roughly 500-600 square feet of surface) adds $2,000-$4,500 over a standard drywall job. A full condo unit with multiple party walls and ceiling treatment can add $5,000-$12,000 over the cost of standard drywall renovation.

One important consideration: the labour premium for soundproofing is higher than the material premium because the work requires more precision. Every screw in a resilient channel assembly must hit the channel and not the stud behind it. Every Green Glue application must be consistent. Every perimeter joint must be sealed. Experienced soundproofing installers command higher rates than general drywall hangers because the consequences of poor installation are that the homeowner spent thousands extra and didn't get the sound reduction they paid for.

For accurate pricing on your specific project, browse drywall professionals through the Toronto Construction Network directory at torontoconstructionnetwork.com/directory?trade=insulation.