Mold Remediation Cost in Calgary: Clean It or Hire?
$1,800 to $6,000 for a basement wall
A medium job of about 30 to 50 sq ft. Small jobs run about $500 to $1,500; a whole basement or attic about $3,000 to $15,000 or more. Calgary-area prices read in September 2026.
Calgary-area figures read September 2026 · reviewed 2026-09-28 · how we set these ranges
Where do you stand?
Answer a few yes or no questions to see which step applies to you.
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Check before you pay
Do you need a test first?Usually no
Alberta Health Services says air testing for mould is usually not recommended, especially if you can see it. The size of the area and the material it is on decide the next step. If the home was built before 1990, test drywall mud, ceiling tile or flooring for asbestos before any of it is cut out.
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Size it
Health Canada sizes mould by area, and CMHC says who should clean each size.
SmallOne to three patches, each under 1 m² (10 sq ft). You can clean it yourself if you are in good health.
MediumMore than three patches, or patches between 1 and 3 m² (32 sq ft). CMHC: qualified and trained maintenance staff.
ExtensiveAny patch larger than 3 m². CMHC: qualified and trained mould remediation contractors.
Size bands: Health Canada. Who cleans each size: CMHC.
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What the work costs
Small (under about 10 sq ft) $500 to $1,500 Medium (a basement wall, 30 to 50 sq ft) $1,800 to $6,000 Large (whole basement or attic) $3,000 to $15,000+ We found no Alberta licence or certification for mould remediation contractors and no City of Calgary permit for the work.
Area
The size bands above drive most of the price.
Porous materials
Drywall, carpet and ceiling tiles typically need to be removed rather than cleaned (Alberta Health Services).
The moisture source
Mould can start to grow within 24 to 48 hours on a damp surface (Alberta OHS bulletin BH018). The source has to be fixed or it comes back.
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Check the work
We found no Alberta rule that sets a clearance test for mould, and Health Canada says air test results cannot be used to assess health risks. Agree on a post-remediation check before the work starts: what will be looked at, who looks, and what happens if mould or moisture is still there.
- The moisture source is named and fixed, not only the mould cleaned
- Porous materials that were removed are listed
- A written note of what was checked at the end, and by whom
Calgary and Alberta rules that apply
- We found no Alberta licence or certification for mould remediation contractors, and no City of Calgary permit for the work.
- The OHS Code requires an employer to control workers' exposure to mould through the hierarchy of controls. It sets no mould limit, and neither does Health Canada.
- Built before 1990? Drywall mud, ceiling tiles and flooring can contain asbestos. Test before anything is cut out.
- Any deposit before the work is finished means the business must hold an Alberta prepaid contracting licence. Contracts of $200 or more must be in writing.
Ask before you sign
- What will be removed and what will be cleaned
- How the area will be contained
- How the moisture source will be fixed
- What the post-remediation check involves, and who does it
Do I need bleach?
Health Canada says there is no need to use bleach: clean small areas with water and dish detergent.
Want this done at your place?
Tell us what you found or suspect and we'll get you a real quote from a local Calgary abatement or remediation contractor. We send it out to local contractors for you. Free, no pressure.