This guide compares 22 mould removal companies serving Ottawa with contact details, service areas, and public review history. The list opens with Ottawa Site Restoration. 20 carry a sourced public rating, averaging 4.7 stars; the highest-rated is SERVPRO of Ottawa, Vanier at 5.0 stars from 145 Google reviews.
Mould removal in Ottawa is two jobs: remove the mould, and fix the moisture that grew it, or it comes back. Health Canada draws the line for professional help at a single patch larger than three square metres, or mould that returns after cleaning. The companies below remove mould from basements, attics, bathrooms and walls across Ottawa, and each one's Google reviews are on its listing.
Also covers: Mold removal · Mould remediation · Mold remediation · Mould inspection · Mold testing · Basement mould · Attic mould · Black mould
Listed first
A focused Ottawa shortlist. Businesses selected by the directory are listed first. Listings claimed by their owner and showing a rating from a named public source come next; all other positions follow our published rating methodology.
Businesses selected by the directory, then listings claimed by their owner and showing a rating from a named public source, appear first. All other positions follow the selected sort.
ClaimedBarrhaven +8
Junk RemovalOttawa Site Restoration is a junk removal and cleanup crew serving Ottawa and Gatineau: same-day hauling, hoarding cleanup, water and flood damage restoration, mould remediation, demolition and post-construction cleaning. (613) 852-4059.
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Gloucester
5.0(145)on GoogleChecked Oct 2026Mould RemovalSERVPRO of Ottawa, Vanier is a water damage restoration service in Gloucester, Ottawa offering duct cleaning, building restoration and carpet cleaning. Rated 5 from 145 Google reviews.
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PatchBoyz Ottawa Drywall Repair is a dry wall contractor in Ottawa offering asbestos testing and water damage restoration. Rated 4.9 from 245 Google reviews.
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OIES is an environmental consultant in Ottawa offering asbestos testing. Rated 5 from 44 Google reviews.
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HMJ Contracting Inc. is a fence contractor in Ottawa offering asbestos testing, bathroom renovation and kitchen renovation. Rated 5 from 33 Google reviews.
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Restoration Mate Ottawa is a water damage restoration service in Ottawa offering asbestos testing, building restoration and environmental consultant. Rated 5 from 28 Google reviews.
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911 Restoration of Ottawa is a water damage restoration service in Ottawa offering fire damage restoration and waste management. Rated 4.8 from 51 Google reviews.
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MICO Restoration and Abatement Services is a water damage restoration service in Ottawa offering fire damage restoration. Rated 5 from 20 Google reviews.
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RestorePro Ottawa is a water damage restoration service in Ottawa offering asbestos testing and fire damage restoration. Rated 4.8 from 42 Google reviews.
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Ottawa Air Quality Testing GBE Assessments is an environmental consultant in Ottawa. Rated 4.8 from 30 Google reviews.
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Ottawa Mold Removal-Orleans-Kanata is a water damage restoration service in Ottawa offering asbestos testing, environmental consultant and fire damage restoration. Rated 5 from 11 Google reviews.
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Barrhaven +7
5.0(9)on GoogleChecked Sep 2026General Contractors24/7 Remedial Services is an emergency restoration company covering Ottawa and Eastern Ontario, handling water and flood damage, fire and smoke damage, mould remediation, asbestos abatement and odour control, with a dispatcher answering around the clock.
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Asbestos Removal Ottawa - AUCOIN'S is an asbestos testing service in Ottawa offering environmental consultant, environmental health and insulation. Rated 5 from 8 Google reviews.
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First Response is an environmental consultant in Ottawa offering asbestos testing, building restoration and fire damage restoration. Rated 4.6 from 83 Google reviews.
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Lacasse Building Solutions is a water damage restoration service in Ottawa offering fire damage restoration and building restoration. Rated 4.6 from 22 Google reviews.
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Indoor Air Quality Ottawa is an environmental consultant in Ottawa offering asbestos testing, environmental health and home inspection. Rated 4.5 from 34 Google reviews.
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Paul Davis Ottawa is a water damage restoration service in Ottawa offering building restoration and fire damage restoration. Rated 4.4 from 266 Google reviews.
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Nepean
3.5(8)on GoogleChecked Oct 2026Asbestos RemovalCanada's Restoration Services is a water damage restoration service in Nepean, Ottawa offering asbestos testing, building restoration and environmental health. Rated 3.5 from 8 Google reviews.
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Nepean
4.1(45)on GoogleChecked Oct 2026Mould RemovalPuroClean Restoration Ottawa West is a water damage restoration service in Nepean, Ottawa offering fire damage restoration. Rated 4.1 from 45 Google reviews.
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ServiceMaster of Ottawa is a water damage restoration service in Ottawa offering building restoration, carpet cleaning and fire damage restoration. Rated 4 from 42 Google reviews.
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Go Pro Restoration is a water damage restoration service in Ottawa offering asbestos testing, fire damage restoration and painting. Rated 4 from 70 Google reviews.
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Barrhaven +8
General ContractorsRogane Cleaning & Restoration is an Ottawa cleanup and restoration business handling mould cleanup, asbestos abatement, and fire, smoke and soot cleaning, followed by drywall repair and painting.
View Rogane Cleaning & RestorationMould and moisture
Health Canada's guidance treats mould as a moisture problem first. Cleaning it off without finding the leak, the condensation or the flood behind it means cleaning it again.
Health Canada sorts mould by area. One square metre or less is small, and you can clean it with precautions and protective equipment. More than three patches, each smaller, adding up to under three square metres is medium: a professional assessment is recommended, though the cleanup can often be done without one.
A single patch larger than three square metres is large. Health Canada says that needs a professional assessment and a professional cleanup.
Unless the cause of the moisture problem has been identified and solved, mould will reappear. Mould begins to grow within 48 hours in an area with too much moisture, so wet drywall, carpet or insulation after a leak is a two-day race.
Health Canada's mould guide recommends keeping indoor relative humidity between 30% and 50%. Its dust and dust mites page gives 35% to 50%, with better ventilation and less moisture as the way to get there.
When the water is coming through the foundation, the job belongs with basement waterproofing companies in Ottawa, and the mould is the second call.
Buyer guide
What separates a great mould removal company from a cheap quote, and the questions worth asking before you sign.
Health Canada is direct about it: unless the cause of the moisture problem is identified and solved, mould will reappear. A quote that removes mould without naming the leak, the condensation or the flood behind it is a quote for doing the job twice.
Health Canada counts one square metre or less as small, a job you can clean with precautions. More than three patches under three square metres is medium, where a professional assessment is recommended. A single patch over three square metres is large and needs professional assessment and cleanup.
Health Canada does not recommend testing the air for mould, and sets no health-based limit for mould indoors, so a lab number cannot tell you the air is safe. Visible growth, a musty smell or past water damage is what to act on.
Some materials cannot be cleaned. Health Canada says drywall with mould under the paint is removed and replaced, and mouldy carpet and underpad are cut out and thrown away. Ask which materials come out, and who puts the walls back.
Before you hire
Health Canada publishes the size at which it recommends a professional for mould, what to ask one before hiring, and why it does not recommend testing the air, which is the right thing to read before comparing quotes.
Ottawa Service Directory is a listings site, not a regulator: we publish what a business reports about itself, so confirm what applies to your job with the source below and with the business before work starts.
Source: Health Canada: Guide to addressing moisture and mould indoors. Checked 2026-08-24. Rules and thresholds change, so confirm before work starts.
Common questions
Mould Removal by area
For homeowners
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