Roof Cleaning & Moss Removal Built for Seattle Roofs
Moss doesn't just make a roof look neglected — it lifts shingles, holds water against them, and shortens the life of the roof you already paid for. We remove it without high pressure, without walking your roof more than we have to, and without the damage a pressure washer leaves behind.
- check_circle From $310 — no hidden add-ons
- check_circle Licensed & insured
- check_circle No high-pressure washing on shingles
- check_circle Seattle & Eastside — roof + gutter in one visit
Moss on the roof? We've often got a slot this week.
Send your address and we'll check availability and send a quote — usually within 1–2 hours during business hours. Same-day and next-day slots open up often.
- schedule Quote in 1–2 hrs
- event_available Same-day & next-day slots
- call Fast, no-pressure callback
How Much Does Roof Cleaning Cost in Seattle?
Most Seattle roof cleanings land between $310 and $750, depending on how much moss has taken hold, how steep the roof is, how easy it is to reach, and whether you add preventive treatment.
- Roof moss removal, single storyfrom $310
- Roof moss removal, two storyfrom $420
- Heavy moss, steep or hard-access rooffrom $640
- Moss prevention treatment (add-on)from $95
- Roof + Gutter Cleaning bundlefrom $410 — save $49
Steep pitch or tight access adds 30–50% to the labor — we tell you that before we start, not after. Every quote is fixed before the first visit. What changes the price: roof size, pitch, moss coverage, roof material, access, and years since the last cleaning.
Why Seattle Roofs Grow Moss (And Yours Will Too)
Moss needs three things: moisture, shade, and something to hold onto. Seattle hands it all three for nine months a year.
Our rain doesn't arrive in storms that dry out by noon — it arrives as weeks of damp. Douglas firs and big-leaf maples shade the north slope of most roofs here all day. And composite shingles have exactly the rough, granular surface moss spores need to anchor.
That's why a roof in Phoenix can go twenty years untouched and a roof in Ballard grows a green carpet in four. It isn't neglect. It's the Pacific Northwest.
The north-facing slope always goes first. If you're seeing green on one side and a clean roof on the other, that's not a coincidence — and it's the earliest sign it's time to act.
What Moss Actually Does to Your Roof
Moss isn't a stain sitting on top of your shingles. It grows under the edges of them.
As it thickens, it acts like a wedge, lifting shingle edges a few millimeters at a time. Water that should run off now has somewhere to sit. It wicks sideways under the shingle, soaks the felt beneath, and freezes there in January — expanding, cracking, loosening the granules that give the shingle its lifespan.
A roof rated for 25 years can lose a third of that. Replacing it costs tens of thousands. Removing the moss costs $310.
That math is the entire argument for roof cleaning, and it's why we treat this as maintenance, not cosmetics.
How Roof Cleaning Works
A careful, no-pressure process that protects the roof while getting the moss genuinely gone.
1. We look before we quote
Pitch, material, moss coverage, access, gutter condition. You get a fixed price before anyone touches the roof.
2. Dry removal first
Loose moss comes off with soft brushes and low-pressure tools. Nothing is scraped, nothing is blasted. Scraping strips granules; blasting drives water under the shingles.
3. Soft wash treatment
A low-pressure application kills what the brushes can't reach — spores, algae, and the black streaks caused by Gloeocapsa magma. The pressure is closer to a garden hose than a pressure washer.
4. Roof blow & gutter clear
The debris we knocked loose has to go somewhere. We clear the roof surface and the gutters so it doesn't end up in your downspouts next week.
5. Optional prevention
A treatment that slows regrowth, plus zinc strips along the ridge if your roof suits them.
block We never pressure wash a roof
Ever. A pressure washer will strip the protective granules off composite shingles in seconds and force water under them. It looks clean for a season and costs you years of roof life. If a contractor offers to pressure wash your shingles, that's the moment to end the conversation.
Moss Removal vs Roof Washing: Which Do You Need?
They're sold as the same thing. They aren't.
Moss removal is what you need when you can see green, three-dimensional growth — cushions of it along shingle edges and in valleys. This is physical removal plus treatment, and it's the more involved job.
Roof washing handles the flat black streaks and general grime that appear without any moss at all. Those streaks are algae, not dirt, and no amount of rinsing removes them. They need a soft wash treatment.
Most Seattle roofs need both. We quote them together because sending a crew twice costs you more than doing it once.
Is Roof Cleaning Safe for My Shingles?
Done correctly, yes — and leaving the moss is the genuinely risky option.
The danger isn't cleaning. It's how it's cleaned. Two things damage a roof: high pressure, and aggressive scraping. We use neither. Our tools are soft brushes and low-pressure application — the same approach used on painted siding.
We also minimize time spent walking on the roof. Foot traffic on warm composite shingles causes its own damage, so we work from ladders and edges wherever the pitch allows.
We're licensed and insured. If someone is going up on your roof, that isn't a detail to skip over — an uninsured contractor's fall becomes the homeowner's problem. Ask us for the certificate. Ask everyone else for it too.
Eco-Friendly Roof Treatment
Everything that comes off your roof lands in your yard. In Seattle, a lot of it ends up in a storm drain that runs to Puget Sound.
We pre-wet and protect plantings before treatment, use the lowest effective concentration rather than the fastest one, and control runoff instead of letting it find the nearest drain. If you have a vegetable bed, a pond, or a slope down to the street, tell us — we plan around it.
Cleaner roof, intact garden, nothing extra in the Sound.
Roof + Gutter: Book Them Together
Cleaning a roof fills the gutters — the moss and debris we remove goes over the edge. So we clear them in the same visit. The crew and ladders are already there, which is why the bundle costs less than booking twice.
- Roof cleaningfrom $310
- Gutter cleaningfrom $149
- Booked separately$459
- Roof + Gutter bundlefrom $410
Roof Cleaning FAQ
How much does roof cleaning cost in Seattle? expand_more
How much is moss removal from a roof? expand_more
Can you clean a roof without damaging it? expand_more
How often should a Seattle roof be cleaned? expand_more
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Do I need to be home? expand_more
Will it kill my plants? expand_more
Do you clean gutters too? expand_more
Your Roof Is Getting Older Every Wet Month
Moss doesn't pause for winter — winter is when it does the most damage. Send us your address and we'll look at pitch, material, and moss coverage, and come back with a fixed price — usually within 1–2 hours during business hours.
Licensed & insured · Seattle & the Eastside · No high pressure, ever
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