Interior construction covers the structural and layout work inside a home: finishing a basement, removing or adding walls, reframing a floor plan, building additions within the existing envelope, or combining rooms to open up a space. It sits apart from cosmetic renovation work because it usually touches framing, load-bearing elements, electrical and plumbing rough-ins, and permits. Richmond Hill has 6 businesses listed in this category, ranging from small design-build crews to larger outfits that handle full basement or main-floor transformations.
Because this work changes the structure of a house, the stakes are higher than a paint or flooring job. A wall that looks non-load-bearing can still be tied into the roof trusses above it. A basement finish done without a permit can cause problems when you sell. Before you hire, a buyer should look for a few concrete things:
- Permit handling. Ask directly whether the contractor pulls permits for structural changes, egress windows, and basement second units, and whether that's included in the quote or billed separately.
- Trade coordination. Interior construction usually needs an electrician, plumber, and HVAC tech at some point. Find out if these are in-house employees or subcontractors, and who is responsible for scheduling them.
- A real scope of work. A written scope should specify framing dimensions, insulation type and R-value, drywall type (fire-rated where required), and what happens to existing ductwork or plumbing stacks.
- Proof of insurance and WSIB coverage, since structural work carries more liability than surface renovations.
- References from similar jobs, ideally a finished basement or wall removal completed in the last two years, not just a kitchen refresh.
Our scoring weighs verified reviews, how consistently a contractor responds to and resolves customer complaints, how long they've operated in the Richmond Hill area, and the completeness of their licensing and insurance information. It's built to separate contractors with a track record on structural work from those who mostly do smaller cosmetic jobs. You can see exactly how each of the 6 is scored and ranked in the ranked guide to Richmond Hill renovation contractors, and read the full method behind the numbers on our methodology page.
