Interior construction covers the structural and finishing work that happens inside a building rather than on its exterior: framing and removing walls, building out basements, finishing offices or retail units, installing drywall, ceilings, flooring, and doing the electrical and mechanical coordination that goes along with it. In Toronto, this trade shows up everywhere from condo renovations and second-unit builds to commercial fit-outs in office towers and storefronts. We're tracking 133 businesses in this category across the city, ranging from small crews handling residential basement or office builds to larger firms set up for multi-unit commercial projects.
Before hiring, ask to see permit history for structural changes (load-bearing walls, egress, fire separations), a written scope with materials specified by brand or grade, and proof of WSIB coverage and liability insurance. A contractor who won't put the scope and payment schedule in writing is a red flag no matter how good the price looks. It also helps to see photos of completed work similar to yours, not just showroom shots.
Our scoring weighs verified license and insurance status, how consistently a contractor delivers on scope and timeline, and patterns in customer feedback over time, rather than a single star average. For the full ranked list with scores and reasoning, see our best interior construction contractors in Toronto guide. Details on how we build these rankings are on our methodology page.
