How much does it cost to add a laundry room in a previously unfinished GTA basement?

Adding a laundry room to a previously unfinished GTA basement typically costs between $5,000 and $15,000, depending on whether plumbing connections already exist and the level of finishing you want. If your basement already has a laundry hookup with hot and cold water supply lines, a drain connection, and a dryer vent, you're looking at the lower end of that range. If plumbing needs to be run from scratch — which means breaking and repairing the concrete floor — costs climb significantly.

The plumbing work is usually the biggest variable. If you're working with an existing rough-in, a licensed plumber can connect the drain, supply lines, and install a utility sink for roughly $1,500 to $3,000. Without any existing plumbing, expect $3,000 to $6,000 or more for new drain lines, which involves cutting through the concrete slab, connecting to the main drain, and potentially installing a sewage ejector pump if the drain line sits below the main sewer connection — that pump alone adds $2,500 to $5,000 installed. All plumbing work in Ontario must be done by a licensed plumber and requires a separate plumbing permit from the City of Toronto or your local municipality.

Beyond plumbing, you'll need to budget for framing and insulation around the laundry area at roughly $3 to $6 per square foot, moisture-resistant or mould-resistant drywall at $24 to $32 per sheet for the mould-resistant variety, and flooring — porcelain tile or luxury vinyl plank are the best choices for a basement laundry room since both handle moisture well. LVP runs $3 to $8 per square foot installed, while porcelain tile costs $8 to $18 per square foot installed. Electrical work for a dedicated 240-volt dryer circuit, a 120-volt washer outlet, and proper lighting will run $1,000 to $2,500 and must be completed by an ESA-Licensed Electrical Contractor.

One detail many GTA homeowners overlook is ventilation. The dryer must vent directly to the exterior — never into the basement space — and the vent run should be as short and straight as possible. Long, convoluted dryer vent runs reduce efficiency and create a fire hazard from lint buildup. If your basement layout puts the laundry room far from an exterior wall, consider a condensing dryer that doesn't require exterior venting, though these cost more upfront. You'll also want a floor drain near the washing machine in case of leaks or overflow, and a backwater valve on the drain connection is strongly recommended to prevent sewage backup during heavy rainfall — something the GTA sees regularly.

Properly waterproofing the laundry area before finishing is essential. A washing machine leak or supply hose failure in a finished basement without proper moisture management can cause thousands of dollars in damage. Consider installing braided stainless steel supply hoses, an automatic shutoff valve, and a leak detection sensor for peace of mind.