Inspection Sur Mesure
“They are ultra professional, I left a voicemail and they immediately called me back to advise me that it must be another company.”
Best Mold Inspection & Testing in Longueuil, QC
15 companies listed · 4 in Longueuil · 3 open 24/7 · 11 open weekends · all 15 rated 4.5+
Data verified October 17, 2026
Sylvain Dionne Inspecteur en Bâtiment
“The reports are detailed, rigorous, and Sylvain takes his time to inspect exhaustively and with lots of explanations and supporting photos.”
LCL
“Clear communication, relevant information, very good explanations to all our questions, punctuality and ease of contacting them at all times.”
ACE Laboratoires
“Professional service, attentive to the customer, good advice and fast results.”
Restoration Avenue
“We sought prices and opinions from other companies, but nobody came close to what Restoration avenue had offered us in terms of price and approach.”
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Clic Inspections
“Very fast and professional service, thank you!”
Listed for homeowners in and around Longueuil, QC, these 15 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.
Area overview: Longueuil, QC
4 of the 15 companies we list are based in Longueuil; the other 11 serve Longueuil from towns including Montreal (4 km), Saint-Lambert (4 km) and Verdun (10 km). The companies on this page are rated from 4.5 to 5.0 across 1,741 reviews; 10 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (95%), quality (69%) and responsiveness (61%). The topics that come up most in reviews of the companies on this page are "efficient", "informative" and "price". 3 are open around the clock and 11 are open on weekends. 2 show a licence on their websites. Domain records put 7 websites of the companies on this page at ten or more years old; the oldest dates from 2002. 3 offer emergency call-outs; 1 offers financing or payment plans; 1 gives free estimates and 1 lists coupons or special offers. We have a website on file for all 15 of the companies on this page; 9 publish a contact page; 7 list a public email and 1 takes bookings online. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Is one opinion enough on a damp problem?
Not when the first visit ends with a large removal quote attached. You have 15 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.
MTL Home Inspection: Inspection Maison Montreal
“His professionalism, his thoroughness in his work, his attention to detail and work ethics are all qualities one can appreciate.”
YG Home Inspection Services
“I initially reached out after reading the reviews, and now I understand why they were so high!”
Restornet
“The entire house was fogged to eliminate the mold, and mold patches were treated.”
Louis Noël
“Fast, friendly, thorough, professional response and service, roof inspected with drone.”
Robert Young's Montreal Home Inspection Services Inc.
“He completed a home inspection for me and was very thorough and provided a detailed report afterwards.”
Axxonlab Inc.
“No surprises, no delays, no trying to upsell services for things you didn't anticipate.”
Qualitam Inc
“He was thorough in his investigation and I felt very safe and assured that he would discover any mold problems we were having.”
Polo Inspection/Inspection Polo
“Pierre Polo is an efficient inspector who listens to the needs of his clients.”
Flood Cleaning Montreal
“Thank you for making a difficult situation a little easier.”
Why these companies made our list
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