Should the builder pay for the final clean or is that the buyer's responsibility in Ontario?

This is one of the most common points of confusion in new home purchases in Ontario, and the answer depends heavily on what your purchase agreement actually says — but there are clear industry norms that can help you understand what to expect.

Who Pays for Post-Construction Cleaning in Ontario New Builds

In Ontario, the builder is generally responsible for delivering the home in a clean, habitable condition before the occupancy permit is issued. Under the Ontario Building Code, a property must be clean and free of construction debris before the City of Ottawa will grant occupancy. This means some level of post-construction cleaning is legally required before you can move in, and it falls on the builder to achieve that threshold. However — and this is an important distinction — "clean enough to pass inspection" and "move-in ready clean" are two very different standards.

What builders typically provide is a rough clean and a basic final clean performed by their own cleaning crew or a subcontractor. This usually covers debris removal, a general wipe-down of surfaces, and basic floor sweeping or vacuuming. What it often does not cover is the kind of thorough, detail-oriented deep clean that a homeowner expects when moving into a brand-new home. Drywall dust in corners, paint overspray on fixtures, grout haze on tile, sticker residue on windows, and fine particulate in HVAC ducts are frequently left behind after a builder's standard clean.

Your Tarion warranty — Ontario's new home warranty program — does not specifically mandate a cleaning standard, but it does require the home to be free of deficiencies at closing. If surfaces are visibly damaged by improper cleaning or if debris has caused damage, that may fall under warranty coverage. It is worth reviewing your Tarion documentation carefully and doing a thorough pre-delivery inspection, or PDI, with a written record of any cleaning-related concerns.

From a practical standpoint, most Ottawa homeowners who have just purchased a new build end up paying for at least one professional post-construction cleaning out of pocket, even when the builder has done their standard clean. This is especially true in winter builds, where Ottawa's extremely dry heating-season air — indoor humidity drops to 15 to 20 percent — causes drywall dust and fine particulate to penetrate every vent, surface, and crevice in the home. HVAC duct cleaning alone, which runs $400 to $800 for a typical Ottawa home, is almost never included in a builder's standard clean but is essential after any winter construction.

A professional post-construction final clean for a new 1,500-square-foot Ottawa home typically costs $1,200 to $1,800. If your builder's clean falls short of your expectations, you have a few options: document the deficiencies in writing during your PDI, request that the builder address specific items before closing, or budget for a professional top-up clean after possession. Many buyers find the latter is simply easier than negotiating with the builder over cleaning standards.

Before closing, always ask your builder directly what their cleaning scope includes and get it in writing. Ask specifically whether HVAC ducts, windows, grout lines, and light fixtures are included. If the answer is vague, assume you will want a professional clean after possession.

If you do end up needing a post-construction cleaning contractor after taking possession, the Ottawa Construction Network directory at justynrookcontracting.com lists local cleaning contractors you can browse and contact directly — a useful starting point for getting a few quotes and comparing what each service includes.