Sumas, WA · Whatcom County
Roofing in Sumas from a family-owned GAF Master Elite roofer.
Right on the border, Sumas takes the brunt of cold Fraser Valley winds, heavy rain and the occasional flood season. Topside has been replacing and repairing Whatcom County roofs for over 35 years.
- Free inspection and written estimate
- GAF Golden Pledge lifetime warranty available
- Serving Sumas, Nooksack and Everson for 35+ years

Roofing in Sumas
What Fraser Valley weather does to a Sumas roof.
Cold outflow winds from the Fraser Valley hit Sumas first, and the open farmland around town gives that wind plenty of room to build.
Sumas homes
From town homes to farm buildings.
Sumas has a mix of older homes in town and rural properties with shops and barns. Many older roofs have past layers or tired decking. We tear off to the deck, replace anything soft and give you a clean, watertight roof.
On open lots, wind is the main enemy. We pay close attention to edges, ridges and fastening so your roof stays put through winter storms.

Recent work
Roofs our crews have finished.
Real Topside projects from around Northwest Washington.






What's included
Every Topside roof replacement includes:
Full tear-off to the deck
No roofing over old roofing. We remove everything so the deck can be checked.
Decking repair
Soft or rotted plywood is replaced before the new roof goes on.
Underlayment and leak barrier
Synthetic underlayment, plus ice and water leak barrier in valleys and at eaves.
New flashing
Walls, chimneys, skylights and vents get new flashing, not reused metal.
Ventilation check
Ridge and intake venting sized so the attic can dry out in our damp months.
Cleanup and walkthrough
Magnet sweep for nails, all debris hauled away, and a final review with you.
PledgeWarranty
Warranty
A warranty backed by GAF, not just the roofer.
- Lifetime
- Coverage on qualifying GAF shingles and system parts
- 50 years
- Non-prorated coverage for manufacturing defects
- 25–30 yrs
- GAF coverage for installation errors
Available on qualifying complete GAF roof systems installed by a GAF Master Elite contractor.
Reviews
What homeowners say.
“Topside roofing recently installed a new roof for us. They did excellent work; we love it! They promptly responded to all my questions, offered a competitive price, had a hard working crew out here to do the job, picked up after themselves and overall made the process simple.”Kiersten J. · Google review · roof installation
“The team who put on my new roof did a beautiful job. They were friendly, respectful, and professional, and afterwards did a very thorough clean-up of the property.”Sibyl S. · Google review · new roof
Nearby
Also roofing near Sumas.
- Sumas
- Nooksack
- Everson
- Kendall
- Lynden
- Maple Falls
- Bellingham
Sumas roofing questions
Do you serve all of Sumas?
Yes. Topside works across Sumas and the surrounding area, including Nooksack, Everson and Kendall.
Do you do roof repairs too, or only replacements?
Both. If the roof is in good shape and the problem is in one area, a repair may be all you need. See our roof repair page.
How much does a new roof cost in Sumas?
It depends on roof size, pitch, layers, material and what we find under the old roof. We give a free written estimate, and monthly payments are available through our financing partners.
What about moss on my roof?
Moss holds water against the shingles and lifts their edges. We can clean and treat a roof that still has life left, or talk through replacement if the shingles are worn out. See roof maintenance.
Is Topside local?
Yes. Topside is a family-owned roofing company based in Bellingham that has been roofing Northwest Washington since 1989.
Get a free roof estimate in Sumas.
Family-owned, GAF Master Elite, and roofing Whatcom County for over 35 years.
