How Much Does Mold Removal Cost in Ontario?
Found mold and wondering what it will cost to deal with? Here is an honest breakdown of mold removal pricing in Ontario and what drives the number.
Mold removal cost is one of the first questions homeowners ask, and the honest answer is that it depends on how much mold there is, where it is, and what caused it. This guide gives realistic ranges for Ontario and explains what moves the price so there are no surprises.
Typical mold removal price ranges in Ontario
• Small, contained jobs (a single patch under about one square metre, on a hard surface): roughly $500 to $1,500.
• Medium jobs (one room, drywall and insulation removal, containment and air scrubbing): roughly $1,500 to $4,000.
• Large or whole-basement remediation (extensive growth, multiple rooms, HVAC involvement): roughly $4,000 to $10,000 or more.
These are ballpark figures. Every property is different, which is why a reputable company inspects before quoting rather than pricing over the phone.
What drives the price up or down
• Size and spread: the area affected is the single biggest factor.
• Location: mold inside walls, under floors, or in HVAC ductwork costs more to reach and treat than surface growth.
• Material damage: if drywall, insulation, or flooring must be removed and rebuilt, that adds to the bill.
• The moisture source: remediation that does not fix the leak or flooding behind it will fail, so the cause has to be corrected too.
Why cheap surface cleaning can cost more later
Wiping visible mold with bleach may look like a fix, but it does not address growth inside porous materials or the moisture feeding it. Mold returns, often worse, and the eventual remediation is larger. Proper mold remediation contains the area, removes affected materials, treats surfaces, and verifies the space is clean.
Does insurance cover mold removal?
Sometimes. If the mold resulted from a sudden, covered water event — like a burst pipe — remediation may be covered. Mold from long-term, unaddressed leaks or humidity is usually excluded. Our guide to filing a water damage claim in Ontario explains what insurers look for.
The cheapest mold job is the one you prevent
Because mold is almost always a moisture problem, the lowest lifetime cost comes from stopping water in the first place — fast drying after any leak, and basement waterproofing where groundwater is the issue.