How Much Does Roof Cleaning Cost in Lake Stevens, WA? (2026 Guide)
Real 2026 roof cleaning cost in Lake Stevens, WA — price ranges by home size, what drives the number, what our soft wash includes, and how to spot a risky quote.
If you live in Lake Stevens, you already know what a wet winter does to a north-facing roof. By February there’s a green fuzz along the shingle edges, black streaking down the slopes, and maybe a clump of moss growing in a valley where the fir needles pile up. The first question everyone asks me is the same: what’s this going to cost to fix?
Here are honest 2026 numbers for our area, what moves the price up or down, and how to tell a fair quote from one that’s going to cost you a roof.
The short answer
For a typical single-family home in Lake Stevens, a professional roof soft wash runs $299 to about $950, with most homes landing in the $450–$750 range. Larger footprints, steep pitches, and heavy moss push it higher. Small ramblers with light streaking come in at the bottom of the range.
2026 roof cleaning price ranges — Lake Stevens
| Home size & type | Typical price |
|---|---|
| Single-story rambler, ~1,000–1,500 sq ft of roof | $299 – $500 |
| Single-story, larger or cut-up roofline, ~1,500–2,500 sq ft | $450 – $700 |
| Two-story, ~2,000–3,000 sq ft of roof | $650 – $950 |
| Steep-pitch, three-story, or heavy moss, 3,000+ sq ft | $950 – $1,300 |
These are soft wash prices — low pressure, a cleaning treatment that’s left to dwell, then a full rinse. They are not the price of someone running a pressure washer across your shingles, which is cheaper up front and far more expensive later (more on that below).
What actually drives the price
Roof size and layout. More square footage is more product and more time. A simple gable roof is quick; a roof chopped up with dormers, valleys, skylights and multiple levels takes longer to cover safely.
Pitch and access. A walkable 4:12 pitch is straightforward. A steep 9:12 or a three-story wall of roof means roped access, more setup, and more safety gear — that’s real labor and it shows in the quote.
Moss severity. Light black streaking (that’s gloeocapsa algae, not dirt) treats and rinses easily. Thick moss mats with root systems in the shingle seams need a gentler, more patient approach and sometimes a follow-up visit as the dead moss releases over the following weeks. Heavier growth costs more.
Surroundings. Big-leaf maples and Douglas firs directly over the roof mean more debris, more shade, and faster regrowth — some companies price that in.
Add-ons. Most Lake Stevens homeowners bundle a gutter cleaning and a house wash with the roof while we’re already set up on site, which is cheaper per service than booking them separately. If you want the black “tiger stripe” staining taken off the outside of the gutters, that’s our separate gutter brightening service.
What’s included in our roof cleaning
- A walk of the roof and a look in the gutters before we quote, so there are no surprises
- Plants, downspout outlets and landscaping wetted down and protected
- Our in-house roof treatment applied at low pressure and left to dwell — this is what kills the moss, algae and lichen at the root
- A full, careful rinse once the treatment has done its work
- Loosened debris cleared from the roof and out of the gutters
- Done in line with ARMA and shingle-manufacturer cleaning guidelines, so your shingle warranty stays intact
We offer a premium soft wash (the method we recommend for asphalt shingle) and a lower-cost budget powder treatment for homeowners who want the moss killed on a tighter budget. We’ll walk you through both when we quote.
For a broader county-wide breakdown, see our roof cleaning cost guide for Snohomish County.
How to spot a risky quote
- A price far below $299 for a whole roof. Nobody can cover a house roof with treatment, protect the landscaping, and rinse it properly for $150. Something is getting skipped — usually the dwell time or the plant protection.
- The word “pressure” anywhere near your shingles. High pressure blasts the protective granules off asphalt shingle and voids most manufacturer warranties. It looks clean for a season, then the roof ages years in a hurry.
- No proof of license or insurance. In Washington you can verify any contractor through L&I in about thirty seconds. We’re licensed and insured — registration #OLSONLP747MF.
- No before/after work and no reviews. Ours are on our reviews page and in our project gallery.
Frequently asked questions
How long does a roof cleaning take? Most Lake Stevens homes are a single visit of two to four hours. Heavy moss jobs sometimes need a short return trip once the dead growth has fully released.
Will the moss come back? Eventually — this is the Pacific Northwest. A good soft wash keeps a roof clear for roughly two to three years. Keeping the roof and gutters free of debris and trimming back overhanging branches stretches that out.
Do you clean the roof in winter? We can, but late spring and early fall give the treatment the mild, dry-ish conditions it likes. We don’t treat in a hard freeze.
Is soft washing safe for my plants? Yes, when it’s done right. We pre-wet and rinse landscaping before, during and after, and we keep runoff controlled. Washington’s Department of Ecology has good guidance on keeping wash water out of storm drains, and we follow it.
Can you do the gutters and house at the same time? Yes, and it’s cheaper that way. A roof-plus-gutters-plus-house-wash visit is the most common booking we run in Lake Stevens.
Get a firm number for your roof
Every roof is a little different, so the real answer comes from a look at yours. Call or text (425) 446-0547, or send a few photos through our quote form and I’ll get you a firm price — no sales pitch, no pressure.
