What interior construction contractors do
Interior construction covers the structural and finishing work inside a home or commercial unit: framing and removing walls, drywall and taping, flooring installation, ceiling work, electrical and plumbing rough-ins tied to a renovation, and finish carpentry like trim, doors, and built-ins. It's the trade you call for a basement buildout, an office fit-out, a kitchen that needs a wall moved, or a full gut renovation before the finishing crews come in. Unlike a general handyman, these contractors typically pull permits, coordinate subtrades, and manage a project from framing through to final inspection.
We're tracking 6 businesses offering this service in Markham.
What to look for before you sign a contract
Ask to see proof of a valid contractor license, WSIB coverage, and liability insurance before any work starts. Get a written scope of work with a fixed price or a clearly explained cost-plus structure, and check whether the quote includes permit fees and disposal costs. A serious contractor will also flag any structural changes that need an engineer's stamp rather than just starting demolition.
How our scoring works
We rank contractors on factors like verified licensing, review consistency, responsiveness, and how well their work history matches the scope of interior projects (structural vs. purely cosmetic). See the full breakdown and ranked list at our best renovation contractors guide for Markham, and read our methodology for how each score is calculated.
