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1 of these companies is based in Ancaster; the others serve Ancaster from towns including Hamilton, Burlington and Oakville.
12 open 24/7 · 18 open weekends · 21 rated 4.5+ · 2 show a licence
Data verified October 16, 2026
Listed for homeowners in and around Ancaster, ON, these 24 companies test for mould and indoor air problems. Listings show what each one states about sampling, lab work and the environmental tests it offers, plus ratings and quotes from public reviews.
The 24 companies on this page are rated from 4.0 to 5.0 across 1,646 reviews; 11 have 50 or more reviews and 21 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), responsiveness (83%) and quality (81%). The topics that come up most in reviews of the companies on this page are "cleanliness", "knowledge" and "price". 12 are open around the clock; 18 are open on Saturdays and 16 on Sundays. The services the companies on this page list most often on their websites are mold removal (3), asbestos abatement (2), commercial inspections (2), fire and smoke damage (2) and general contracting (2). 2 show a licence on their websites and 3 list staff certifications (WETT and IICRC). 9 have ten or more years of experience, the longest 28 years. 13 offer emergency call-outs; 1 offers financing or payment plans; 10 give free estimates; 6 are family- or locally-owned and 1 lists coupons or special offers. We have a website on file for all 24 of the companies on this page; 22 publish a contact page; 17 list a public email and 2 take bookings online. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Not when the first visit ends with a large removal quote attached. You have 24 companies on this page, so getting a second diagnosis is straightforward. Ask each one what it thinks the water source is. Two independent answers that match is the strongest signal you will get.
