How to Choose a Pressure Washing Company in Portland

To choose a pressure washing company in Portland, verify an active Oregon CCB license and general liability insurance, confirm they soft wash roofs and siding instead of blasting them, ask how they protect plants and gutters, and compare written quotes that spell out surfaces, method and solutions — not just a single number.

Start with the paperwork — it takes five minutes

Oregon requires contractors working on structures to hold an active license with the Construction Contractors Board. You can look up any CCB number on the state’s site in under a minute and see whether the license is current and whether claims have been filed against it. Ask for that number before the estimate, not after the work.

Then ask for a certificate of general liability insurance. Exterior cleaning happens on ladders, on roofs, on second-story siding, around your landscaping and often within a few feet of a neighbor’s fence. If a hose whips a window or a ladder gouges the trim, insurance decides whether that becomes your problem or theirs.

• Active Oregon CCB license — verify the number yourself
• General liability coverage, with a certificate you can actually read
• Workers’ comp if more than one person will be on your property
• A real local service area, not a national lead-generation phone number

Ask what pressure they will actually use

This is where Portland-area homes get damaged. Composition shingles, cedar shake, vinyl siding, painted wood and stucco should never take high pressure. They need a soft wash — low pressure plus a biodegradable solution that kills moss and algae at the root. Concrete, brick and unsealed pavers are the opposite: those can take real pressure and a surface cleaner for an even finish.

A company that answers “we pressure wash everything” is telling you something useful. So is one that can explain, before ever seeing your house, which surfaces get which treatment and why.

Local experience matters more than you would think

Our climate creates problems a crew from a drier market simply has not practiced on. Moss grows thickest on north-facing slopes and anywhere a Douglas fir or big-leaf maple keeps a roof in shade. Fir needles pack into gutters in a dense mat that will not rinse out. Roofs here can stay damp for weeks at a stretch from November through March, which is exactly why a rinse-only clean fails so fast.

Ask how they handle shaded north-facing sections, whether moss debris gets bagged and hauled or flushed into your beds, and whether they offer a no-regrowth treatment afterward. A company that works Vancouver, WA, Beaverton and Gresham roofs every week will have an immediate, specific answer instead of a vague one.

Questions worth asking before you book

• What solution do you use, and is it safe for plants and pets once it dries?
• Do you pre-wet and rinse the landscaping around the work area?
• Will you walk the roof, or work from ladders and an extension pole?
• Is gutter cleaning included, or billed separately?
• What does the warranty cover if moss comes back in six months?
• Do you bring your own water, or use my spigot?

Red flags worth walking away from

Door knockers with a “we were already in the neighborhood” price that expires today. Quotes given over the phone with no photos, no address lookup and no questions about roof pitch or square footage. Cash only, no written scope of work. Before-and-after photos that clearly are not Pacific Northwest houses. And any bid dramatically under every other bid — that gap is usually the cost of insurance, disposal and honest time on site.

Compare quotes on scope, not just price

A useful quote names the surfaces, the method for each one, what is included — gutter faces, downspouts, debris haul-off — and the price. Two “roof cleaning” bids can differ by hundreds of dollars simply because one includes full moss removal and treatment while the other is a rinse that looks good for a season. If you want a sense of the local range before you start calling, our 2026 Portland roof cleaning cost guide breaks down what pushes the number up or down.

Finally, read reviews for detail. “Great job” tells you nothing. “They tarped the hydrangeas and swept the driveway before leaving” tells you exactly what that crew is like on an ordinary Tuesday.

NW Exterior Solutions has cleaned more than 1,000 Portland-metro homes since 2015 — licensed, insured and soft-wash trained on every roof and siding type in the region. Get a free quote and take 30% off your first service.