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Mold Testing in Ontario & Quebec
Looking can’t tell you what’s in your air. An independent lab can. We take the samples, the lab counts what’s there, and you get the numbers in writing.
$550 air test
With inspection and report, before tax
3 to 5 business days
Usual time for lab results
CALA-accredited labs
Independent, to ISO/IEC 17025:2017
15,000+ inspections
Completed since 2005
Last updated: November 3, 2026
Mold testing measures what is in the air or on a surface. An inspector takes the samples, an independent CALA-accredited laboratory counts the spores and identifies the mold types, and you get a written report that compares your indoor air with a sample from outside.
An air test is $550 plus tax, including the visual inspection, the outdoor sample, the lab analysis and the report. Lab results usually take 3 to 5 business days. It’s one of four mold services we offer.
Mold testing costs $550 for a full air test
Prices before tax.
| Option | What it answers | What’s included | Price |
|---|---|---|---|
| Air test | Which molds are in this room’s air, and how much compared with outside? | Visual inspection, 1 indoor sample, free outdoor baseline sample, lab analysis, written report | $550, plus $260 per extra sample |
| Surface (tape lift) sample | Is this stain mold, and what type? | Sample and lab analysis, on request | Ask our team |
| Visual inspection | Where is the moisture, and is there visible growth? | Moisture meter, hygrometer and infrared camera. No lab sample | $95, plus $155 for a written report |
| Virtual inspection | Do I need a test at all? | Video call with an inspector | Free for owners and buyers, $100 for tenants |
Mold testing measures what an inspection can only suspect
The two answer different questions, and most visits use both.
Finds it
Mold inspection
- Where is the moisture coming from?
- Is there growth, and how far has it spread?
- Uses a moisture meter, hygrometer and infrared camera
Measures it Usual pick when you can’t see it
Mold testing
- Which molds are present?
- How much, compared with the air outside?
- Uses samples read by an independent lab
Our mold inspection tells you where to look. A mold test tells you what’s there. The $550 air test includes both.
But a mold test isn’t always the right first step
Myth Every mold problem needs a lab test.
Fact If mold is visible and the cause is obvious, a lab result rarely changes the plan. We’ll tell you so on the call.
Myth A clean air test means there’s no mold.
Fact An air sample describes that room on that day. Growth sealed behind a wall may not show up, which is why we pair samples with moisture readings.
Myth A home test kit gives the same answer.
Fact Mold spores are in every building, so a dish will grow something. A kit can’t compare your air with outdoor air, and it can’t find the water.
People often ask me for a mold test before anything else. Most of the time I want the moisture readings first, because they tell me whether a lab sample will answer your question. If it won’t, I’ll say so and save you the money.
We test homes, workplaces, air and surfaces
Residential Mold Testing
For houses and condos: a visual inspection plus air or surface samples in the rooms that concern you.
- Home buying/selling inspections
- Post-water damage testing
- Health symptom investigations
- Pre-renovation assessments
Commercial Mold Testing
Specialized testing for offices, retail spaces, warehouses, and industrial buildings following workplace safety standards.
- Employee health protection
- Documentation for insurers
- Quoted per building
Air Quality Testing
Professional-grade air sampling to measure mold spores in the rooms that concern you, compared with the air outside.
- Airborne spore counts
- Mold types present
- Free outdoor baseline sample
- Humidity reading
Surface Sampling
Sterile collection and laboratory analysis of samples from walls, floors, ceilings, and other surfaces using advanced techniques.
- Tape lift sampling
- Bulk material analysis
- CALA-accredited labs
So every mold test follows the same five steps
From the first call to a report you can hand to a landlord, insurer or contractor. See our full process.
Talk it through
Tell us what you’re seeing. Urgent jobs are booked for the earliest available visit.
Close the windows
Keep windows closed for 12 to 24 hours before the visit.
Inspect and sample
Visual inspection with moisture and thermal readings, then indoor samples and one outdoor. Usually 2 to 3 hours.
Lab analysis
An independent CALA-accredited lab reads the samples, usually in 3 to 5 business days.
Written report
Lab results, findings and recommendations, with a remediation estimate if needed.
What Our Clients Say
Sarah M.
Ottawa, Ontario
Michel L.
Montreal, Quebec
Jennifer K.
Kingston, Ontario
Mold testing across Ontario and Quebec
Our inspectors come to you. Pick your city for local detail, or see all our service areas.
Ontario 613-701-9893
Ottawa and the eastern Ontario corridor.
Toronto and the GTA 647-693-6858
A free virtual assessment across the GTA, with on-site visits by appointment.
Mold testing questions, answered
How much does mold testing cost?
An air test is $550 plus tax for the first sample. That includes the visual inspection, a free outdoor baseline sample, lab analysis and the written report. Each extra sample is $260 plus tax, so testing two rooms comes to $810. Commercial buildings are quoted per building. Our cost guide covers the wider costs.
How long do mold test results take?
Lab results usually take 3 to 5 business days. That time belongs to the laboratory, and surface samples generally come back faster than a full air count. The inspector shares preliminary findings before leaving, and rush lab analysis is available for an extra fee.
How do I prepare for a mold test?
Keep windows closed for 12 to 24 hours before the visit, so the air we sample is the air you normally live in. Tell us which rooms concern you and when the problem started.
When do I need mold testing?
Testing helps when you smell or suspect mold but cannot see it, when you have symptoms with no visible cause, after water damage, or when you need proof for a landlord, insurer or buyer. It is also worth doing before buying a home. If mold is visible and the cause is obvious, you may not need it.
How accurate are mold test results?
Air samples show the spore count and mold types at that moment, measured by an accredited lab and compared with the outdoor sample. They are reliable for that room on that day. They cannot prove that nothing is growing behind a closed wall, which is why we pair them with moisture readings.
Are home mold test kits worth it?
A kit can show that mold grew on a dish, but mold spores are in every building. A kit cannot tell you the concentration compared with outdoor air or where the moisture is. Our DIY inspection guide shows what you can check yourself.
What happens if the test finds mold?
Your written report explains which areas need attention and why, with a remediation estimate if needed. We do the mold removal too, and a clearance test afterwards confirms the job worked. You can also take the report to any contractor you choose.
Book your mold test
Tell us what you’re seeing, and we’ll tell you whether a test is worth it.
Immediate Contact
Calls answered 24/7 • The earliest available visit • Free consultation
If the test finds mold, we can take it from there
One certified team stays accountable from diagnosis through post-remediation clearance testing.
Certified team
IICRC, NORMI, CRMI and NAMP certified, with over 15,000 inspections since 2005. See our certifications.
The right equipment
Air-O-Cell cassettes, thermal imaging and Tramex moisture meters, calibrated regularly.
Removal when you need it
Our mold removal service works from your report, then a clearance test confirms the job worked.
Guides that go deeper on mold testing
How sampling works and what it costs.