Mould Remediation in the GTA and surrounding areas
Is a Hidden Moisture Problem Threatening Your Home and Health?
Mould is never just a surface issue—it is always the direct result of a moisture problem that has gone undetected. In basements across the GTA and surrounding areas, where high humidity, poor insulation, or minor foundation cracks create the perfect breeding ground, mould can spread quickly behind drywall and under floorboards.
At Supreme Basements, we don’t just wipe away the visible stains. We identify the source of the moisture, safely contain the area, and completely eliminate the mould to restore healthy, clean air to your home.
Why Professional Mould Remediation Matters
Properly removing mould (remediating) is imperative to prevent cross-contamination. Scraping or spraying mould without professional equipment can actually release millions of airborne spores, spreading the danger to other parts of your property.
Our professional restoration experts follow a strict, certified protocol to ensure your basement is safe for your family.
Our Core Safeguards:
- Certified Remediation: Identification, strict containment, and removal of mould from indoor spaces to restore optimal air quality.
- Commercial-Grade HEPA Filtration: We deploy heavy-duty HEPA air scrubbers on every single project, capturing up to 98% of airborne particulate matter and mould spores.
- Air Quality Testing Options: Want absolute peace of mind? We offer advanced air quality testing options so you can rest easy knowing your home’s air is safe from invisible hazards.
- Prevention Strategies: As basement specialists, we don’t just clean up the mess. We provide actionable structural recommendations to ensure the moisture—and the mould—never returns.
The Supreme 5-Step Mould Removal Process
Our specialists safely assess the extent of the damage. Before any removal begins, we completely seal off the affected areas with heavy-duty plastic sheeting and negative-pressure zones to isolate the spores.
We run commercial-grade HEPA filters and vacuums continuously throughout the remediation process. This cleans the air in real-time and prevents toxic cross-contamination into your upper living areas.
Infested materials that cannot be salvaged (like damaged drywall or insulation) are carefully bagged and removed. Remaining structural surfaces are thoroughly scrubbed.
We apply naturally sourced antimicrobial cleaning products. These specialized treatments are designed to kill subsurface mould spores and clear away stubborn surface staining without introducing harsh, toxic chemicals into your home.
Once the area is certified clean, we look at the root cause. Whether you need foundation repair, a new sump pump, or updated insulation, we provide a blueprint to keep your basement permanently dry.
Enhance Your System with Aprilaire Dehumidification
True moisture control doesn’t stop at sealing out liquid water managing indoor humidity is just as vital for a healthy home. We offer professional Aprilaire dehumidifier installations to actively manage moisture levels post-waterproofing. This creates a powerful secondary defence system against mould growth, musty odours, and humidity damage. Protect your home in the GTA and surrounding areas from every angle.
Why Choose Supreme Basements?
We are a fully integrated team of property restoration and basement professionals. From structural foundation repairs and waterproofing to complete mould removal, we tackle the difficult jobs from start to finish.
- Locally Owned & Operated – Serving the GTA and surrounding areas with deep knowledge of local housing structures.
- Fully Uniformed & Background-Checked – Our experienced team arrives on time, every time, and respects your home.
- Certified & Fully Insured – We strictly adhere to industry safety standards to protect your property value and your health.
- No Harsh Chemicals – We prioritize treatments that are highly effective against mould but completely safe for your kids and pets.
Real Reviews. Real People.
ReviewsPosted on Google Jake TremblettMay 12, 2026Trustindex verifies that the original source of the review is Google. Great experience dealing with Cory, Sami, Josh and the rest of their crew! They helped with all of our waterproofing needs and carried out the work with absolute professionalism.Posted on Google Rachel EnglandApril 2, 2026Trustindex verifies that the original source of the review is Google. Super friendly, efficient and work was well done! Thank you Garneel and Josh!Posted on Google Rick GaultMarch 20, 2026Trustindex verifies that the original source of the review is Google. Great experience from start to finish Highly recommend for your crawl space Special thanks to Gurneel and JoshPosted on Google Andrew FolkeringaFebruary 27, 2026Trustindex verifies that the original source of the review is Google. The entire process was seamless. They left the job site was left as if they were never there. Deana was a joy to deal with scheduling and Sami, Gurneel and Carlos were very pleasant to deal with during the repairs. Would highly recommend!Posted on Google Joao Pedro Monteiro Garcia D'avilaFebruary 25, 2026Trustindex verifies that the original source of the review is Google. Extremely pleased with Supreme Basement Solutions. The initial customer service from Deana was very helpful. Once I scheduled an initial assessment, everything from obtaining a quote to finishing the job was excellent. Gurneel, Carlos and Semi did a very thorough job.Posted on Google steve hartFebruary 20, 2026Trustindex verifies that the original source of the review is Google. The whole Supreme experience was , well “ Supreme” . The explanation of what needed to be done was clear, and Sammy was amazing. Job very well done.Posted on Google Mary Ann PinsonneaultFebruary 13, 2026Trustindex verifies that the original source of the review is Google. Good workers. Got the job done efficiently and showed great care by covering the floor all the way to the work area. Would definitely recommend them for your basement needsPosted on Google Paolo FerlisiDecember 19, 2025Trustindex verifies that the original source of the review is Google. For a stressful situation, Cory made the entire process light and simple. After examining the area where water was entering, he explained 3 different scenarios. He went over the procedures, timeframes and costs involved for each one. We immediately got a good vibe that he is an honest professional. We took a few days and decided to go with Supreme and we are happy that we did. Sami and Josh were very respectful of our pets and property and I think they get that it's a stressful time for the owners. They were all business. Sami explained everything that was going to happen step by step. He even called me downstairs a couple of times to explain what he was doing. (I left them to their work so I wasn't in their way) Both Sami and Josh cleaned up when the job was completed to the point where you wouldn't have know they were there. We are both happy with the work performed by Sami and Josh and we are grateful for Cory and Supreme Basement Solutions. Thank YouPosted on Google Mary CollinsNovember 7, 2025Trustindex verifies that the original source of the review is Google. We contacted Supreme Basement Solutions to assist with our crawl space area. Supreme did an excellent job. Workers went above and beyond to complete the job to our satisfaction. Would definitely contact them again for further services and would highly recommend them.
What Triggers Basement Mould in the GTA and surrounding areas?
Understanding where the moisture comes from is half the battle. Our team frequently fixes mould caused by:
Basement Flooding & Seepage:
High water tables or heavy storms in the GTA and surrounding areas push water through foundation cracks.
Poor Basement Insulation:
Cold concrete walls meeting warm indoor air create hidden condensation behind your drywall.
Sump Pump or Plumbing Failures:
Even a minor, slow pipe leak behind a basement wall can trigger toxic black mould within 24 to 48 hours.
Don't Wait Until it Spreads. Get a Free Assessment.
If you smell a musty odour, see dark staining, or have recently dealt with a damp basement, take action before the damage worsens.