What is the cost to add fire-rated drywall enclosures around furnace and water heater rooms in a GTA home?

Fire-rated enclosures around furnace and water heater rooms in the GTA typically cost $1,500-$4,500 for materials and professional installation, depending on room size, existing framing conditions, and whether you're enclosing one appliance or creating a separate mechanical room.

The Ontario Building Code requires fire-rated assemblies around fuel-burning appliances to protect the rest of the home from potential fire spread. This means using 5/8-inch Type X fire-rated drywall on all walls and ceiling surfaces of the enclosure, properly taped and finished to maintain the fire resistance rating. A single gap or improperly finished joint can void the entire fire rating, making this definitively professional territory.

Material costs for a typical 8x10 foot mechanical room enclosure run $800-$1,400, including 5/8-inch Type X drywall ($20-$28 per 4x8 sheet), metal framing if needed ($150-$300), fire-rated joint compound, tape, and screws. You'll need approximately 12-15 sheets of Type X drywall for walls and ceiling. If you're just boxing in a furnace and water heater in an existing basement, the enclosure might be smaller (6x8 feet), reducing material costs to $500-$900.

Professional installation adds $700-$3,100 to the project. The complexity depends heavily on your existing setup. If your furnace and water heater are already in a framed room that just needs drywall, installation is straightforward. However, many GTA homes have appliances sitting openly in the basement, requiring new framing to create the enclosure. This involves building walls around the equipment while maintaining proper clearances for combustion air, service access, and code-required working space.

Critical considerations that affect cost include access panels and ventilation. The enclosure needs a fire-rated access door or removable panel for service work on the equipment. Combustion air requirements mean you cannot simply seal the room — proper ventilation openings must be maintained per manufacturer specifications and Ontario Building Code requirements. Gas-fired equipment needs adequate combustion air, and electric water heaters still need service access.

In older GTA homes, this project often uncovers complications that increase costs. Asbestos-containing materials around old furnaces require professional abatement before proceeding. Electrical panels located near the furnace may need to be relocated to maintain proper clearances. Plumbing or ductwork might need minor modifications to fit within the new enclosure while maintaining code clearances.

Timing affects pricing significantly in the GTA market. Winter projects cost 15-25% more because contractors are busier with heating system emergencies and access to unheated basements is less comfortable for workers. Summer and fall are ideal timing for this type of project.

This work typically requires a building permit because you're creating a new fire-rated assembly. The permit adds $150-$300 to the project cost but ensures the work meets Ontario Building Code requirements and gets properly inspected. Some contractors include permit costs in their quotes; others charge separately.

Never attempt this as a DIY project. Fire-rated assemblies must be installed exactly to manufacturer specifications and Ontario Building Code requirements. Incorrect screw spacing, wrong joint compound, or gaps in the assembly eliminate the fire protection. Insurance companies may deny claims if fire-rated assemblies are improperly installed by non-professionals.

Get quotes from contractors experienced with fire-rated assemblies — not all drywall installers are familiar with the specific requirements for mechanical room enclosures. Ask to see photos of previous fire-rated work and verify they understand combustion air and clearance requirements for your specific equipment.

Need help finding a drywall contractor experienced with fire-rated assemblies? Toronto Drywall Installers can match you with local professionals who understand Ontario Building Code requirements for mechanical room enclosures.