What is the correct order of trades for a basement renovation in Toronto?

The correct order of trades for a GTA basement renovation is: demolition, waterproofing/structural, rough plumbing, rough HVAC, rough electrical, insulation and vapour barrier, inspection, drywall, painting, flooring, finish plumbing, finish electrical, trim and millwork, and final inspections. Getting this sequence wrong causes costly rework — for example, drywalling before the rough-in inspection means tearing out drywall for the inspector to see the framing and wiring behind it.

Here's the trade sequence explained in detail, including why the order matters:

Phase 1: Demolition and preparation. If there's existing finishing, it comes out first. Remove old drywall, insulation, flooring, and any materials that are damaged, mouldy, or in the way of the new layout. This reveals the foundation walls, floor slab, and joists so everyone can assess the actual conditions. A general contractor or dedicated demolition crew handles this, and disposal costs $1,000–$3,000 for a full basement strip-out in the GTA including bin rental.

Phase 2: Waterproofing and structural work. This MUST happen before any finishing trades enter the space. Foundation crack repair, interior or exterior waterproofing, sump pump installation, weeping tile replacement, and underpinning all happen now. If you skip this step and proceed to finishing, you're gambling your entire renovation investment on a foundation that may leak. Structural work like underpinning, beam modifications, or support post relocation also happens at this stage because it requires open access to the foundation and framing.

Phase 3: Framing. Your carpenter or framing crew builds all partition walls, bulkheads around ductwork, closets, and room layouts according to the approved permit drawings. Framing defines every room and must be complete before mechanical trades begin their rough-ins, because the plumber, electrician, and HVAC installer all need to know exactly where walls, ceilings, and soffits will be. If you're cutting the concrete floor for bathroom plumbing, the cut and dig happens at this stage.

Phase 4: Rough plumbing. The plumber goes first among the mechanical trades because drain pipes are the most inflexible — they must maintain proper slope (1/4 inch per foot) and connect to the main stack at fixed points. The plumber installs drain lines, water supply lines, vent stacks, and the backwater valve. If concrete was cut for the bathroom, the plumber completes the underground plumbing and the concrete is poured back before other trades walk on it.

Phase 5: Rough HVAC. The HVAC contractor extends ductwork from the existing trunk line, installs supply and return register boots in each room, and connects any new equipment (mini-splits, HRV connections). HVAC goes after plumbing because ductwork is more flexible in routing and can work around drain pipes, but drain pipes can't easily work around ductwork.

Phase 6: Rough electrical. The ESA-licensed electrician runs all wiring — circuits for outlets, switches, pot lights, bathroom exhaust fan, dedicated appliance circuits, smoke and CO detectors, and the subpanel if needed. Electrical goes last among rough-in trades because wires are the most flexible and can route around pipes and ducts. The electrician also installs all junction boxes and secures wiring to framing.

Phase 7: Insulation, vapour barrier, and inspection. With all rough-ins complete, insulation goes in — spray foam or rigid foam on foundation walls, batt insulation in partition walls, and 6-mil polyethylene vapour barrier on the warm side. Then you call for the rough-in inspection from the City of Toronto Building Division. The inspector verifies framing, plumbing, electrical, HVAC, insulation, and vapour barrier all meet code. Do not install drywall before this inspection — the inspector must see everything behind the walls.

Phase 8 onward: Drywall, paint, flooring, finish trades, trim, and final inspections. Once the rough-in inspection passes, drywall goes up, gets taped and finished, then painted. Flooring is installed after painting (to avoid drips on the floor). Finish plumbing (toilets, sinks, faucets) and finish electrical (switches, outlets, light fixtures) happen after flooring. Trim, baseboards, and doors go last. Then final inspections from the building department and ESA close out the permit.