Mold Inspection & Testing in Sarnia & Lambton County
Musty smell but nothing visible? Unexplained allergies indoors? Buying or selling a home? Get facts before you get quotes.
scienceBook an Inspection — +1 249-451-9964When Testing Makes Sense (and When It Doesn't)
We'll be straight with you: if you can see a large patch of mold and you know where the water came from, you don't need a test — you need remediation. Testing earns its money in the situations where you can't see the problem:
- Musty odour with no visible source — mold hidden inside wall cavities, under flooring, or in a crawlspace.
- Health symptoms that improve when you leave the house — congestion, headaches or asthma flare-ups that ease at work or on vacation.
- Real estate transactions — buyers wanting certainty before waiving conditions; sellers wanting documentation that an old issue was resolved.
- Landlord/tenant disputes — an independent lab report settles arguments that opinions can't.
- Post-remediation verification — proof the cleanup actually worked before walls are closed back up.
- After a flood or leak that "seemed fine" — moisture meters find the damp materials your eyes can't.
What a Proper Mold Inspection Includes
Visual inspection
The full property — basement, attic, bathrooms, plumbing, windows and exterior grading. In Lambton's older and shoreline homes we focus on stone foundations, crawlspaces and attic ventilation.
Moisture readings
Pin and pinless meters on suspect walls, floors and framing — mold needs water, so we follow the moisture.
Thermal imaging
Where useful, to spot temperature anomalies that indicate hidden dampness behind finished surfaces.
Air sampling
Indoor air samples compared against an outdoor baseline, analyzed by an independent accredited lab. Elevated spore counts indoors tell us there's a source, even when it's hidden.
Surface sampling
Tape or swab samples when we need to confirm whether a stain is mold and what species it is.
A written report
Photos, readings, lab results — and most importantly, what to do next. If remediation is warranted, you'll know the scope. If it isn't, we'll say so.
Independent Answers, No Sales Pressure
The dirty secret of "free mold inspections" is that a company that only makes money on removal has every incentive to find a removal job. Our inspection is a paid, standalone service that stands on its own: if your musty smell turns out to be a dead mouse in a duct or condensation you can fix with a $60 dehumidifier setting, that's what the report will say.
verified Rush service for real estate deadlines
Standard lab turnaround is 3–5 business days; rush processing is available when a closing date is on the line.
Common Hidden-Mold Situations in Lambton Homes
The finished basement that flooded "years ago." Dried on the surface, wet in the wall cavity. Mold grows quietly behind vapour barrier and drywall until the smell gives it away.
Attic mold found during a roof quote or home sale. Usually a bathroom fan venting into the attic, or blocked soffit vents — common across Sarnia's postwar housing.
Shoreline cottage conversions. Bright's Grove, Point Edward and Forest homes winterized without moisture design grow mold inside newly finished walls within a couple of winters.
Crawlspaces under additions and older rural farmhouses — bare earth floors breathing humidity into the house all summer.
Mold Testing FAQs
How much does mold testing cost in Sarnia?expand_more
A visual inspection with moisture readings typically runs $200–$400. Air sampling adds lab fees — usually $100–$150 per sample, with 2–3 samples (including the outdoor control) being typical. You'll get exact pricing before we book.
How long do lab results take?expand_more
Standard turnaround is 3–5 business days. Rush service is available for real estate deadlines.
Can you test the air in just one room?expand_more
Yes, though we always take an outdoor control sample too — indoor counts only mean something compared against what's naturally in the air outside that day.
If you find mold, do you have to report it to anyone?expand_more
No. The report is yours. Homeowners aren't required to report residential mold findings to any Ontario authority — what you do with the results is your decision.
Book Your Mold Inspection
Lab-backed answers and a written plan — before anyone quotes you a dollar figure for removal.
Stop Guessing. Get a Real Answer.
Lab-backed mold inspection across Sarnia and all of Lambton County.
scienceCall +1 249-451-9964