How much would it cost to convert my detached Ottawa garage into a soundproofed screening room?

Converting a detached Ottawa garage into a properly soundproofed screening room typically costs between $45,000 and $90,000 all-in, depending on the starting condition of the garage, the level of acoustic isolation you need, and how much finish work is involved. The soundproofing component alone — decoupled walls, isolated ceiling, floated floor, sealed HVAC, and proper doors — generally accounts for $20,000 to $40,000 of that total, with the remainder going toward insulation, electrical, HVAC, finishing, and AV rough-ins.Breaking Down the Major CostsThe first major expense is thermal and structural preparation. Most Ottawa garages are uninsulated shells with concrete slab floors, single-layer walls, and minimal electrical service. You will need to bring the space up to habitable standards before any soundproofing begins, which means spray foam or batt insulation in walls and ceiling ($3,000-$6,000), upgraded electrical panel or sub-panel ($1,500-$3,000), and an HVAC solution — either a mini-split heat pump at $3,500-$5,500 installed or ducted heating tied to your home system. Given Ottawa's winters hitting -25°C to -30°C regularly, heating a detached structure efficiently is critical, and a cold-climate rated mini-split like a Mitsubishi Hyper-Heat is the most common choice for garage conversions.For the soundproofing itself, the gold standard is a room-within-a-room approach. This means building completely new stud walls inside the existing garage walls with a 1-inch minimum air gap, using sound isolation clips ($4-$7 each) and hat channel to decouple double layers of 5/8-inch Type X drywall with Green Glue compound between them. Walls alone run $15-$25 per square foot installed. The ceiling gets the same treatment — isolation clips, hat channel, double drywall with Green Glue, and Rockwool Safe'n'Sound packed in the cavities. The floor requires a floated assembly using rubber isolation pads or a product like Kinetics RIM under a new plywood subfloor, typically adding $8-$15 per square foot. Budget approximately $1,500-$3,000 for a solid-core exterior door with proper acoustic seals and threshold, since the garage door opening will need to be permanently framed in and insulated.Do not forget that this level of conversion almost certainly requires a building permit from the City of Ottawa — you are changing the use of the structure, adding habitable space, and altering electrical and mechanical systems. Permit fees typically run $300-$800, and you will need drawings that show compliance with the Ontario Building Code for fire separation, egress, energy efficiency, and structural loads. If your property is in a heritage area like the Glebe or New Edinburgh, expect additional review time and potential restrictions on exterior changes.A realistic budget breakdown for a two-car garage conversion (roughly 400-500 square feet) looks like this: structural and envelope work at $8,000-$15,000, soundproofing assemblies at $20,000-$35,000, HVAC at $4,000-$6,000, electrical at $3,000-$6,000, finishing and trim at $5,000-$10,000, and permits and professional fees at $2,000-$5,000. Add a 10-15% contingency because garage conversions almost always reveal surprises — cracked slabs, insufficient footings, or moisture issues that need addressing before soundproofing goes in.For a project of this scope, professional guidance from the planning stage is essential to avoid costly mistakes. The Ottawa Contractor Directory at justynrookcontracting.com/directory lists experienced renovation and soundproofing professionals who can assess your specific garage and provide accurate quotes for the full conversion.Looking for experienced contractors? The Ottawa Construction Network connects homeowners with qualified professionals:HomeupgradersJC CarpentryRrenovatiosCustom By AriePrism ServicesView all contractors →