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Bonny Gibson 10 out of 10

April 13, 2021

Excellent service and I would not hesitate to recommend Thomson Roof Treatment

Scott Connors 10 out of 10

April 12, 2021

Doug is the man. Don’t want him to retire

Pat Wiedeman 10 out of 10

April 10, 2021

Employees were hard working, diligent in their tasks and did a great job cleaning up. The team went the extra mile to clean algae off our fascia boards which really improved the look of our home. I would definitely recommend this company.

Denise Cumming 10 out of 10

April 10, 2021

I am very impressed with the work done by an extremely nice person

Henry Kuyvenhoven 9 out of 10

April 8, 2021

They guarantee their work and I like the way they keep you informed of when the work needs to be done and when they will be coming.

Keith Dixon 10 out of 10

April 7, 2021

Basically the previous job on our roof has endured well, and the present job went smoothly and efficiently and on budget.

Darrin Crozier 9 out of 10

April 7, 2021

Great customer service, the technician actually did the roof above my garage when he was doing my neighbors roof, not knowing I would book my roof 2 months later.

Pam Terry 10 out of 10

April 6, 2021

Client didn’t leave any feedback

Pat Doyle 10 out of 10

April 4, 2021

Arrived early and started on the roof right away. Also nice that the was no mess to clean up after they were finished.

Paul Smith 10 out of 10

April 1, 2021

First of all Thomson was recommended to by my neighbours. It was refreshingly easy to receive an estimate, book the service, and receive a timely call to schedule the work. The crew showed up as scheduled, efficiently and safely completed the work, answered my questions concerning the condition of my roof and gutters, and left … Continued

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

Click for the BBB Business Review of this Roof Cleaning & Stain Removal in Victoria BC

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!