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Jean Hamilton 10 out of 10

December 12, 2021

10 out of 10

Kevin Park 10 out of 10

November 30, 2021

The Job was done in a timely manner. Efficient & Professional.

Becky Wong 10 out of 10

June 25, 2021

After we replaced replaced our first roof. We have been regular customers. This is our second roof, so we have been a long time customer! And there are two other household that use your services on our street! I will try and time the next time we use your services at the same time as … Continued

Kerry Taylor 10 out of 10

June 25, 2021

Roof looks awesome

Lynda Malpass 10 out of 10

June 23, 2021

I’ve been using your services for a number of years now . I’ve always been very satisfied and have recommended your company to friends and neighbours .

Jan & Frank Beddal 10 out of 10

June 22, 2021

Great customer service and after the treatment is completed the roof always looks refreshed and there is no mess from the gutter cleaning.

Suzie Beber 10 out of 10

June 18, 2021

When Doug arrived for the job, I showed him where the Thrush bird nest was in our Secret Garden. Because there was concern for her nest, Doug went and got his vacuum to use on that section of the roof. I really appreciated that. I also appreciated the careful clean-up!!!!!! A friend saw the end … Continued

Isabel Tipton 10 out of 10

June 11, 2021

They came on time, worked quickly, cleaned up and left the place immaculate.

Jim Nolan 10 out of 10

June 10, 2021

Good reputation!

Steen Jessen 10 out of 10

June 2, 2021

Great product and great service!

Thomson Roof Treatment moss removal, roof cleaning and roof maintenance. Our entire family and staff are committed to meeting the high standards of moss removal and roof maintenance our customers demand. Therefore, we have exceeded client expectations in Victoria BC for over 35 years! As a result, a large percentage of our business for decades has been from repeat customers.

TRT's referrals are mainly from Insurance Companies, Roofing Contractors and Home Inspectors because Thomson Roof Treatment exemplifies the method of regular roof maintenance RCABC recommends.

We deliver you the best service for moss removal in Greater Victoria, Saanich, Esquimalt, View Royal, Sidney, Colwood, Langford, Sooke and the Capital Regional District.

Worksafe BC Certified #282337


Our Mission

Our mission is to provide quality roof care that preserves the life of your roof and improves the look of your home.

Manual Removal

We remove moss by hand that has accumulated and is damaging the roof structure by trapping moisture in the seams of roof shingles and flashing. Doug and his team clean away the loose debris from the roof, clear out your gutters and always tidy up the grounds before they leave your site. Your roof will immediately have more curb appeal!


We gently apply Thomson Roof Treatment! It's a unique non-toxic solution and is safe for pets and your garden. Our treatment saturates the roof shingles and neutralizes any moss, lichen, mold or mildew present. That means all the microscopic spores and root systems are killed immediately and continue to wash away for the coming months of rain. Most importantly, we use a gentle, saturating method of application; we do not use pressure washing, which can damage your roof.


After Thomson Roof Treatment has removed the moss, lichen and mildew from your roof and cleared the gutters so they flow properly- you receive a guarantee! TRT's warranty means that your roof will remain moss, lichen and mildew free for up to 2-years or we will return to make sure that you are satisfied, at no cost to yourself. Doug and his crew assess each roof individually and always provide you with a guarantee in writing.

Get in touch today for a free quote!