The complete Montreal home inspection company

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Home and Drain inspections, at another level
Prevention CP. is a locally owned business in the Montreal area. We strive for perfection to be the best Montreal home inspection and drain inspection company. With years of experience in the field of home and drain inspections and our immense knowledge of the city we call home, there is no other experience like the Prevention CP experience.

At Prevention CP, prevention is our #1 priority. Whether buying or selling a home, or if you have a problem with the building structure or drainage systems, we are here to serve you at the highest standards.

Inspectors & Admins

Denny Melo - Building Inspector / COO

Denny is the co-founder, lead inspector and chief operating officer of Prevention CP. With well over 7000 building inspections, 17 years of inspection experience and 3 years of carpentry and construction experience, Denny's leadership and knowledge is a massive asset to the Prevention CP team. Denny's work ethic and standards shine beyond your expectations and can be experienced by the other team members of Prevention CP, as Denny personally trained each of our team members to follow his standards, at the very beginning of their inspection careers. Feel free to call us so you too, can experience why Denny's work ethic has made him one of the best and most decorated and popular inspectors in the greater Montreal region!

John S. Onofre - Admin / CEO

John is the co-founder, head of admin and chief executive officer of Prevention CP. John's primary role in Prevention CP is to ensure the proper function and optimization of the company and inspectors. When working with Prevention CP, regardless of the inspector chosen, all clients will benefit from John's knowledge and experience in building inspection, drain inspection, and his experience and knowledge in real estate. Most calls, emails, texts and general client communications pass through John so you will be sure to experience and benefit from his guidance and wisdom!

Normand Despins - Building Inspector

If a human being could be split into two, Normand would be Denny's other half (when were talking about building inspectors of course)! Originally trained by Denny 7 years ago, Normand's work ethic on the field is identical to that of Denny. Customer satisfaction is the name of the game in his mind, all while providing an unparalleled inspection service. His razor sharp eye and unbiased opinion has been guiding his clients, followers and business associates for over 7 years and over 2000 inspections. Feel free to call for Normand and experience what a true building inspection should be!

Samuel D. Asselin - Building Inspector

Sam holds his own in this crazy Montreal metropolitan market. He's been a licensed inspector for over a year and a half and has spent the majority of his time prior to becoming a member of Prevention CP, working for various aeronautic engineering firms in his domain of expertise (mechanical engineering from 2016-2020). When you combine Sam's work ethic, knowledge, natural attention to detail and experience as a mechanical engineer, you get the ultimate inspector. Feel free to call for Sam and experience the perfect combination between old and new school methods, all within his inspection service.

The Prevention CP Experience - Services

Home Inspection

The Prevention CP home inspection experience. An experience like no other inspection company in Québec. All of our building inspectors are InterNACHI Québec certified and follow all guidelines and obligations of the OACIQ.
Condo, home and plex inspection. What to expect?
1. Inspection duration?
-Condos 1-2 hour inspection on average
-Homes 3-4 hour inspection on average
-Duplex/Triplex 4-5 hour inspection on average
2. Average report turnover time is between 24-72 hours.
3. Average report length?
-Condos 30-60 pages on average.
-Homes/Plexes 70-120 pages on average.
4. Inspection costs? Fees vary on size and age of the property, please text/email us for the appropriate quote!
5. Bottom line, we never sacrifice quality and genuinely inspect every property as if it was our own investment. We mean it.

Drain Inspection

The Prevention CP drain inspection experience. An experience like no other drain company in Québec.
What to expect during a drain inspection?
1. Inspection duration?
-45 minutes to 1.5 hours on average depending the scenario
2. Drain inspection report?
-The drain inspection report is provided in PDF form within 24-48h.  A USB key with videos and photos from what we've seen is also included.
3. Inspection costs vary depending on the inspection, please text/email us for the appropriate quote!
4. What can we inspect?
-Sewer lines, french drains, any underground drainage system, anti back flow valves and other drain applications.
5. Bottom line, we have a bunch of fancy equipment with a fancy specialist who's ready to tackle whatever fancy drain diagnostics you need!

Radon Testing

What is radon? Radon is a radioactive gas that forms from uranium present naturally in Earth’s crust. Radon is found in soil, everywhere on Earth’s surface. Levels of radon in the soil can vary greatly from one place to another. Radon can also be present in groundwater.

Is it dangerous? Radon is a toxic and potentially deadly gas that can cause lung cancer if concentration levels reach over 200 Bq/m3 (unit of measure). In the event that radon levels reach over 200 Bq/m3, Health Canada recommends that remedial actions are taken within two years. In the event that radon levels reach over 600 Bq/m3, Health Canada recommends that remedial action be taken within one year.

The diagram on the left taken from the Canadian Cancer Society's Information Package, demonstrates how Radon infiltrates homes.

How would radon enter my home? Radon can infiltrate buildings through dirt floors, cracks in concrete slab or foundation walls, drains, sump pits, crawlspaces, openings around vent pipes and service lines and pipe fittings. For example: faucets can in fact be a point of entry for radon coming from groundwater rich in the gas. Hence, they can contribute to increasing levels of radon in indoor air. Given it is a gas with no smell, taste or color, it is impossible to detect with our senses.

How do I proceed with radon testing? We offer a short term testing solution, preferably used prior to a real estate transaction. The testing duration is 48h-96h. However, we do recommend that if test results show a borderline reading that a long term 3 month to 12 month test be put into action to get a more precise result.

Inspection availability: 24-48h within moment of contact. Contact us for specific availabilities. Emergency situations will always be considered.

Report availability: The entire procedure averages 30 days. (Including shipping and lab testing times)


At Prevention CP, we try and keep things simple.
To book an inspection during office hours, you may send us an email to, call, text or even use our form below!
To book an inspection outside office hours, please send us an email to or use our form below!
Please note that our response time via email & website form is quite rapid in and out of office hours. Take advantage of it!
Our office hours:   Monday-Friday: 9am-5:30pm.   Saturday: 10am-2pm.   Sunday: Closed

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514 449-3185