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...Our workmanship is never noticed 😉
Real Costs. Local Examples. What affects the price. And when to get a professional quote.
By Jud Menshal | Oct 6 2026 | Mold Removal | 12 min read
Mold removal in Ottawa typically costs anywhere from $9 to $14 per square foot for larger remediation projects, with minimum charges of approximately $620 - $1,200 for smaller jobs.
This guide explains the major factors that affect mold removal cost, with real examples from Ottawa homes.
For most residential projects in Ottawa, mold removal costs approximately $9-$14 per square foot for larger jobs. Smaller project may have higher per-square-foot costs due to setup, containment and cleanup requirements.
Project Size
Typical Cost Per Sq. Ft.
Larger projects (e.g. 100+ sq. ft.)
$9 - $14
Medium projects (e.g. 30-100 sq. ft.)
$14 - $25
Small projects
$620 - $1200 minimum
Most mold removal projects have a minimum charge of approximately $620 - $1200, even if the affected area is small. This is because setup, containment, HEPA filtration, cleanup and decontamination can consume most of a day.
The final cost depends on several factors, including:
One of the biggest factors affecting cost is the level of containment required. Larger or higher risk projects require more materials, equipment, labour and decontamination procedure.
Attic mold removal costs in Ottawa typically range from $1,500 - $8,000, depending on the size of the affected area, insulation, accessibility and containment requirements. Keep in mind this does not include the potential need to replace insulation or framing, if disposed.
Learn more about attic mold removal costs →
Basement mold removal cost starts at $620 for a minor affected area. Costs vary based on the extent of the mold, affected materials (drywall, framing, flooring) and moisture source. Unfortunately, where carpet is involved, the affected portion must be cut out if contaminated.
Learn more about basement mold removal costs →
Black Mold removal costs are often higher due to increased containment, specialized procedures and the potential for widespread contamination.
Learn more about black mold removal costs →
Removal of mouldy drywall beings between $620 and $1200. If more mold is discovered, the price increases accordingly until all mould has been cut out. The cost of drywall repair depends on the amount of mouldy drywall cut out. Drywall repair costs (including painting) start at $500 for a 1 square foot area and increase from there.
Learn more about drywall repair costs →
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Yes, mold testing will add to the cost. Especially, if air air or surface samples are required, since this requires manual labour, and lab fees. When mold is suspected and cannot be found or where black mold is suspected and requires additional containment measures, mold testing is recommended.
Learn more about mold testing costs →
Yes, if it was caused by a sudden and accidental event (such as a burst pipe). If mold has formed due to an ongoing moisture issue or due to neglect, the orblem is generally not covered. It also depends on the source. As an example, sewer backups generally require additional coverage.
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Mold removal quotes can vary significantly between contractors due to differences in containment methods, equipment, experience, materials and what is included (or excluded) in the scope of work. Always check references and reviews before hiring a contractor.
Learn more about PatchBoys mold Reviews →
There are 3 main types of mold removal. These are Level 1, Level 2 and Level 3.
🟩 1. Limited Containment (Level 1 / “Minor Containment”)
Used for: Small jobs — less than 10 ft² (≈ 1 m²) of mold.
Setup:
👉 The goal: isolate the immediate area so disturbed spores don’t migrate to clean zones.
Examples of Level 1 Mold Work:
For safe mold handling, compliance with proper mold removal protocols and regulatory safety guidelines is essential.
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🟨 2. Moderate Containment (Level 2)
Used for: Medium-sized contamination — 10–100 ft² (≈ 1–10 m²).
Setup:
-4 air changes per hour minimum.
-Air exhausted outdoors via HEPA air scrubber.
👉 This prevents airborne spores from entering adjacent rooms or HVAC systems.
Examples of Level 2 Mold Work:
/peanutbutter-seo-ottawa-copy3/images/Mold-remediation-in-basement.jpg "Type 2 Mold removal in ottawa cost")
🟥 3. Full Containment (Level 3 / “Critical Containment”)
Used for: Large or high-risk projects — over 100 ft² (≈ 10 m²) or any mold in HVAC, hospitals, schools, or occupied dwellings.
Setup:
-Clean room → Shower → Dirty room → Work area (in large commercial projects).
-Workers change PPE and bag waste before exiting.
👉 Mandatory for attic, crawlspace, or full-basement remediation where multiple materials are impacted.
Examples of Level 3 Mold Work:
Attic & Crawlspaces: Disturbing Due to High spore concentration, negative pressure constros issues and unconditionsed / hard to seal spaces, these must be done under level 3.
Because these apaces are connected to the home's air pressure zones and often move to toward the home, the air must be better controlled. Especially when you consider the fact that the the mold colonies are largest and oldest in these areas. Without proper containment, these can travel through soffit vents, light fixtures, HVAC and unsealed penetrations.
Full Basement Remediation: Where multiple materials are impacted, this containment level must be used.
PatchBoyz goes above and beyond government regulations by using negative air on all mould removal jobs. It is a secondary measure that takes little time to set up and provides additional protection and peace of mind.
If you're concerned and believe you may need mold removal services, we invite you to contact us for a free, no obligation quote. The removal and Disposal in Ottawa is something we're happy to spend time on the phone with you for. We believe that the best way to help people remain calm about the issue is through education. This is one of the reasons we've made so many videos about it here. Above all, remember that Mold is toxic and very hazardous.
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If you choose to have a third party test your home before doing work with us, it is important that the environmental consultant truly have knowledge in full project execution and understand the full scope of what you're looking to have done. Otherwise, the result is that the client ends up with insufficient tests or insufficient amounts of samples and require the consultant to come back and a separate report to be created, ultimately costing the client more money.
In other scenarios, lack of care as described above can lead to an entire project being put on hold in order to perform more testing and then a project increasing exponentially once it is discovered that an additional material, such as plaster, popcorn ceiling or tile, is discovered to be mouldy.
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Article By
Jud Menshal | 📚
Jud is a 14 year Asbestos Removal Type 3 & Supervisor certified remediation technician with additional experience and certifications in Mold, Lead and Finishing. He holds all mandatory safety credentials important for running a safe project site.
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