Affected area
More surface area changes labour, filtration, materials and disposal.
Ontario cost calculator
Mold removal cost
in Ontario.
A ballpark price. No email required.
Adjust the project type, affected area, visible condition, materials, access and moisture source. You will get an immediate planning range—not a bait price and never a substitute for inspection.
Interactive estimate
Move the inputs.
See the range change.
The calculator uses broad 2026 Ontario and Canadian planning bands. Every input changes the range, and the assumptions stay visible.
Early planning range$2,600–$5,600CAD · before HSTGet an exact written scope
Typical remediation scopeOften 1–3 working days
Range includesTypical containment, HEPA controls, labour, treatment and ordinary disposal.
Planning estimate only. This is not a quote. Hidden growth, testing, reconstruction, asbestos, major leak repairs, permits and specialty access can change the final scope. ASM confirms pricing after an on-site inspection.
Base ranges are adjusted for affected square footage, visible severity, porous-material removal, access and containment, and whether the moisture source is repaired. Results are rounded to the nearest $100 to avoid false precision.
Review every pricing factor ↓Pricing methodology
The five factors
behind the quote.
Material type
Porous drywall and insulation may require removal; framing may be restorable.
Access
Tight attics, occupied rooms and commercial sites require different controls.
Containment
The number and size of work zones shape setup and cleanup.
Moisture repair
Leaks, condensation, ventilation or drying must be addressed for lasting results.
Honest pricing starts with evidence
No bait price.
No mystery scope.
You should know which areas are included, which materials are removed, how containment works, what prevention steps remain and when the project is expected to finish before work begins.
Helpful answers
Mold-removal pricing questions
How much does mold removal cost in Ontario?+
For early planning, small localized professional projects may begin around $500 to $1,500, while attic, basement or multi-material remediation commonly reaches several thousand dollars. Extensive or concealed projects can exceed $10,000. The exact quote depends on inspection.
Why can’t mold remediation be priced from a photo?+
A photo cannot show hidden moisture, contamination behind porous materials, attic access, ventilation defects or how much containment is required. Those conditions materially change the work.
Does a larger visible patch always mean a larger project?+
Not always. A small visible patch can connect to concealed moisture, while broad staining may be limited to an accessible surface. Inspection determines the real extent.
Is the inspection really free?+
ASM offers a free initial inspection for properties in its Ontario service area. Confirm the location and availability when booking.
Verified Google reviews
Priced fairly,
in their words.
Reviews published on GoogleRead them on Google ↗
Amazing people and amazing prices. I listed my house for sale and inspector found mold in my attic. I called a lot of other ppl and they were quoting me 1500$ and up. I called ASM mold removal and they took care of everything for an amazing price. Highly recommend.
Amer from ASM Mold Removal did a fantastic job cleaning my parents' attic. He arrived on short notice, explained everything he did thoroughly, and talked with us through the process. His professionalism and expertise was noticeable immediately. I highly recommend his services.
We had mold removed in our attic. Fast and friendly service with before and after pics. Very reasonably priced compared to others.
Quick, fantastic service. Very professional. I got my certificate right away. Thank you! I would highly recommend them!
Same-day response
Want the exact scope for your property?
Book the free inspection. We’ll review the affected area, explain the cost factors and provide the next step.