Bellingham, Washington · Whatcom County

Bellingham Roofing & Exterior Contractor

Roofing, siding, gutters, windows, decks and skylights for Bellingham homes and properties — backed by 35+ years of local experience and a team that understands what Northwest Washington weather does to the outside of a home.

Downtown Bellingham Washington and Bellingham Bay
35+ Years in Business
10,000+ Projects Completed
GAF Master Elite Contractor
A+ BBB Rating
25 Bellingham Neighborhoods
We Actually Work Here

Bellingham is not a generic roofing market

A shaded roof near Whatcom Falls can behave very differently from a newer roof in Cordata or a wind-exposed home closer to the bay. Tree cover, roof pitch, moss, old flashing, attic ventilation, gutters, skylights and how quickly the roof dries all matter.

That is why we look at the entire exterior system instead of treating every problem like a shingle problem. Water can enter at a roof penetration, move behind siding, overflow a gutter, leak around a skylight, or show up inside the house far from where it started.

Moss & shade

Shaded roof slopes and tree-covered lots stay damp longer. Moss can lift shingle edges, trap moisture and hide deterioration underneath.

Trees & drainage

Needles, leaves and debris fill gutters and valleys. Once water stops moving where it should, fascia, siding and roof edges start taking the damage.

Older housing

Older Bellingham homes often deserve extra attention around decking, chimneys, ventilation, flashing, windows and previous remodel work.

Something does not look right?

Call us or send the details through the estimate form. We’ll help you figure out what the next step should be.

What We Do

Complete exterior work for Bellingham homes and buildings

Topside is more than a roofing company. We work on the exterior systems that protect the structure and move water away from it.

Roofing

Repair, replacement and long-term roof care for residential and commercial properties.

Roof Replacement · Roof Repair · Emergency Leaks · Residential Roofing · Commercial Roofing · Metal Roofing

Roof Maintenance

Help with the moss, debris and small problems that shorten the life of Northwest Washington roofs.

Moss Maintenance · Cleaning · Inspections · Condition Reports · Preventive Repairs

Siding & Windows

Exterior wall and opening systems need to be flashed and detailed correctly to keep water outside.

Siding · Replacement Windows · Exterior Trim · Water-Shedding Details

Gutters & Skylights

Two areas that cause a surprising amount of water trouble when they are ignored or installed poorly.

Gutters · Downspouts · Leaf Protection · Skylight Installation · Skylight Replacement

Decks

Deck construction and repair with attention to the places where decks connect back into the house.

Deck Repair · Rebuilds · New Decks · Waterproofing Details

Inspections

Useful when you are planning work, troubleshooting a problem, buying, selling or documenting roof condition.

Roof Condition · Leak Investigation · Storm Damage · Planning

Commercial Exterior Work

Roofing and exterior help for businesses, property owners, managers and light-commercial buildings.

Roofing · Repairs · Maintenance · Exterior Improvements

Financing Available

Larger exterior projects do not always need to be paid for all at once. Ask us about financing options when planning the work.

Not sure which service you need?

You do not have to diagnose it yourself. Tell us what you are seeing and we’ll help point the project in the right direction.

Heavy moss growth on a Bellingham area roof
Moss, Moisture & Roof Life

Moss is more than a cosmetic problem

Heavy moss can lift shingle edges, hold moisture against the roof and make it difficult to see the condition underneath. The right response depends on how established it is and what shape the roofing system is already in.

Some roofs need maintenance. Some need targeted repairs. Others are far enough along that replacement is the more sensible investment.

Look beyond the green stuff Shingles, valleys, flashing, drainage and the roof deck tell us much more than the moss alone.
Repair when repair makes sense A roof with useful life left should not automatically become a replacement project.
Plan around Northwest weather Material, ventilation, drainage and timing all matter in a climate where roofs spend a lot of time damp.
Why Topside

The credentials matter. What we do with them matters more.

Homeowners see plenty of contractors claiming quality workmanship. We would rather show why Topside is different.

GAF Master Elite Qualifying GAF roofing systems may be eligible for enhanced manufacturer warranty options, including Golden Pledge.
35+ years local Decades of work in Whatcom County means we have seen what lasts here and what tends to create problems later.
Complete exterior work Roofing, siding, gutters, windows, decks and skylights can be evaluated as one connected exterior system.
Clear recommendations We explain the condition, the scope and the options so you know what the project actually involves.
Property protection Staging, cleanup, nail pickup and protecting landscaping matter just as much as what happens on the roof.
Follow-through Customers repeatedly mention communication, cleanup and final inspection when reviewing Topside.
Bellingham Alive Best of the Northwest Gold 2025
GAF Master Elite Contractor
BBB A Plus Rating
Gutters & Water Control

The roof only works if the water has somewhere to go

Bellingham trees are great until needles, leaves and moss fill the gutters. Overflowing water can soak fascia, stain siding, damage roof edges and dump water where you do not want it.

When we look at a roofing or exterior problem, drainage is part of the picture. Sometimes the roof is the problem. Sometimes the gutter system is making a smaller problem much worse.

Leaves in a gutter and moss on a Northwest Washington roof
All 25 Neighborhoods

Find your part of Bellingham

A roof in Edgemoor and a roof in Cordata can face very different conditions. Older construction, hillside exposure, mature trees, shade and newer development all change what we pay attention to.

Older & historic Bellingham

These areas include many of Bellingham’s older homes, remodels and established streets. We pay extra attention to old decking, chimneys, previous roof layers, flashing, ventilation and exterior wall details.

Lettered Streets Columbia York South Hill Fairhaven Sunnyland City Center Cornwall Park
Tree cover, shade & moss pressure

Mature trees and shaded slopes keep roofs wet longer and put more debris into valleys and gutters. Moss, drainage and roof ventilation deserve close attention.

Sehome Whatcom Falls Silver Beach Samish South Edgemoor Alabama Hill
Newer development & mixed housing

Newer construction still has its own roofing questions: ventilation, roof geometry, storm exposure, gutters and how well all the exterior details were integrated when the house was built.

Cordata Barkley King Mountain Meridian Irongate Puget
North, west & university areas

These areas include a mix of home ages, lot types and roof styles. Inspection matters more than assumptions — especially when additions and previous remodels have changed the original roof system.

Birchwood Happy Valley Roosevelt WWU
How It Works

What working with Topside looks like

The goal is to understand the problem, explain the options and make the project predictable before work begins.

Tell us what is going on

Leak, moss, missing shingles, old roof, gutter trouble, siding damage or a larger exterior project.

We inspect the property

Roof surfaces, flashing, penetrations, gutters, drainage and other relevant exterior details are evaluated.

We explain what we find

You get a recommendation based on the condition and the scope — repair, maintenance, replacement or a larger exterior plan.

We review the options

Materials, warranty choices, project scope and any issues that may change the work are discussed before scheduling.

We do the work

Property protection, installation details and daily cleanup are part of the project — not afterthoughts.

We finish it properly

Final review, cleanup and follow-up help make sure the project is completed the way it was supposed to be.

What Bellingham Says

Reviews from our customers

★★★★★

“Work began promptly and was completed in three days, including a thorough cleanup. Every aspect of the work was professional, thorough and cost effective.”

Christine Alesi Google review · Roofing
★★★★★

“Scheduling was quick, they were out on time, completed it in under a day, and a foreman came back to make sure everything was water tight.”

Lampworx Google review · Skylight installation
★★★★★

“Topside stood out immediately. Their representative was thorough and professional, and the installation crew worked quickly, stayed friendly, and did a fantastic job.”

Kelly Lynch Google review · Roof replacement

Based in Bellingham

Topside Roofing & Siding
161 E Horton Rd
Bellingham, WA 98226

Serving Northwest Washington

Bellingham and Whatcom County, plus Skagit, Island and San Juan Counties.

Need help now?

The fastest way to reach Topside is to call the office or submit the estimate form with the project details.

Questions

Bellingham roofing & exterior questions

How do I know whether my roof needs repair or replacement?

Isolated problems can often be repaired. Repeated leaks, widespread shingle deterioration, soft decking, heavy moss damage or multiple problem areas may make replacement the better long-term option. The condition of the actual roof matters more than age alone.

Does moss mean I need a new roof?

No. Light moss can be a maintenance issue. Heavy, established moss may have already affected shingle edges or hidden damage underneath, which is why the roof should be evaluated before deciding what to do.

Can Topside help with an active roof leak?

Yes. Call (360) 752-2220. Move belongings away from the leak, safely contain water inside the home and avoid climbing onto a wet roof yourself.

Does Topside only do roofing?

No. Topside also works on siding, gutters, windows, decks, skylights, roof maintenance, inspections and other exterior projects.

What is the advantage of a GAF Master Elite contractor?

Qualifying GAF roofing projects may be eligible for enhanced manufacturer warranty options that are available through GAF Master Elite contractors, including Golden Pledge.

Do you work outside Bellingham?

Yes. Topside serves Whatcom County as well as Skagit, Island and San Juan Counties.

Do you provide free estimates?

Yes. Call (360) 752-2220 or use the estimate form to tell us about the project.

Have a roof or exterior project in Bellingham?

Tell us what you are seeing. We’ll help you understand the problem, the options and the right next step.