pressure-washing

How Much Does Pressure Washing Cost in Tacoma, WA? Moss, Algae, and 2026 Prices

Pressure washing cost in Tacoma, WA for 2026: house, roof moss, driveway, and deck prices, soft wash vs. high pressure, timing, and L&I checks.

How Much Does Pressure Washing Cost in Tacoma, WA? Moss, Algae, and 2026 Prices

Pressure washing a house in Tacoma, WA costs $300 to $650 for most single-family homes in 2026, and roof moss treatment, which is the service Tacoma homeowners call about most, runs $400 to $1,100. Driveways cost $150 to $325, decks $200 to $475, and a full exterior package with siding, roof, driveway, and walks usually lands between $900 and $1,900.

The reason Tacoma prices differ from a drier city is moss. Forty inches of rain a year, mild winters, and heavy shade from Douglas firs and big-leaf maples mean that roofs in the North End, Proctor, and Fircrest grow moss thick enough to lift shingles within a few years, and siding on the north side of every house turns green. Cleaning here is less about blasting dirt and more about killing growth.

House Washing Prices

A single-story rambler with 1,400 to 1,800 square feet of siding, common in South Tacoma, Lakewood, and University Place, runs $300 to $425. A two-story home in the North End or the Stadium District with 2,200 to 2,800 square feet runs $425 to $650, and the large Craftsman and Tudor homes near Wright Park and along North Yakima Avenue can exceed $700.

Cedar siding and painted wood, which are common on Tacoma's older homes, need a gentler wash than vinyl and cost 15% to 25% more. Wood that is washed with high pressure furs up and loses paint, and a company that does a lot of work in the older neighborhoods will know to soft wash it.

The method matters in this climate. Soft washing uses low pressure and a solution of sodium hypochlorite and surfactant to kill algae and mildew, and it keeps a house clean for 18 to 30 months. High pressure on siding removes the surface growth and leaves the spores, and the house is green again by the following spring.

North-facing walls and walls under trees are always the worst. Some Tacoma companies offer a single-side wash for $125 to $225 when only the shaded wall needs it.

Roof Moss Treatment and Cleaning

Roof moss is the biggest exterior maintenance issue for Tacoma homeowners. Moss holds water against the shingles, lifts their edges, and shortens roof life by years, and most roofs in the city need treatment every one to three years.

There are two approaches. Treatment alone applies a moss-killing solution and lets the dead moss wash off over the following months, and it runs $250 to $500 for an average roof. Cleaning plus treatment removes the moss by hand or with low-pressure rinsing, then applies the treatment, and runs $500 to $1,100, and heavy moss on a steep roof can cost more.

Pressure washing a roof is the wrong approach and a good company will refuse to do it. High pressure strips the granules from asphalt shingles and voids the manufacturer warranty. Cedar shake roofs, which are still common in Tacoma's older neighborhoods, need even gentler handling.

Gutter cleaning is usually offered with roof work at $100 to $250 for an average home. Tacoma gutters fill with fir needles year-round, and a company already on the roof can clear them cheaply.

Driveways, Walks, Decks, and Fences

Concrete driveways in Tacoma grow black algae and moss in the shade, and a standard two-car driveway runs $150 to $325 to clean. Long driveways in the North End and in Fircrest can exceed $400. Concrete takes high pressure well, and this is one surface where a pressure wand is the right tool.

Walkways and patios run $75 to $200 depending on size. Exposed aggregate, which is common on mid-century homes in Tacoma, needs care to avoid dislodging stones.

Decks are a big item because the climate is hard on wood. A 300 square foot cedar deck runs $200 to $475 to clean, and most Tacoma decks need a brightener afterward to remove the gray. Sealing adds $1 to $3 per square foot and is worth it, since unsealed wood in the Puget Sound climate goes gray and then soft within a few years.

Fences run $150 to $400 for a typical 100 to 150 foot wood privacy fence. Moss and algae on fences are cosmetic, but a fence that stays wet rots at the base faster.

Why Tacoma Costs What It Does

Labor and insurance costs in Pierce County are high, and pressure washing companies carry general liability insurance to cover broken windows, damaged siding, and dead plants. Companies without insurance quote lower, and if they strip your cedar siding you have no recourse.

Washington requires contractors to register with the Department of Labor and Industries, and pressure washing companies that do anything beyond basic cleaning, such as sealing decks or repairing siding, fall under that registration. Ask for the L&I contractor number and look it up.

Drive time is a factor. Companies based in Tacoma cover Lakewood, University Place, Puyallup, Gig Harbor, and Federal Way, and jobs across the Narrows Bridge or out toward Bonney Lake sometimes carry a trip fee.

The work itself takes longer here. Moss and algae need dwell time for the cleaning solution to work, and a crew that rushes the soft wash gets a house that is green again in six months.

Timing and Frequency in Tacoma

Spring is the busiest season, and companies book out three to five weeks in April and May. Roof moss treatment is most effective in late fall or early spring, when the moss is actively growing and rain will carry the dead material off over the following weeks.

Summer, from July through September, is the dry window for siding and deck work, since the surfaces dry fully and sealing can be done. Fall is a good time for a house wash before the wet season, and some companies discount 10% for October and November work.

Most Tacoma homes need siding washed every 18 months to two years, roofs treated every one to three years, and decks cleaned and sealed every two to three years. Homes under heavy tree cover in the North End, Fircrest, and the west side of University Place are on the short end of every interval.

Pre-listing washing is one of the better returns for sellers. Agents in Pierce County routinely recommend a house wash and roof treatment before photos, because a moss-covered roof reads as a roof that needs replacing.

Hiring a Company in Pierce County

Ask what method they use on each surface. The right answer is soft wash for siding, painted surfaces, and roofs, and higher pressure for concrete only. A company that uses one pressure for everything will damage something.

Ask what moss treatment product they use and whether it is safe for the plants and the storm drains. Tacoma's stormwater rules matter, and some products cannot be allowed to run into the street. Zinc sulfate and sodium hypochlorite solutions are common, and a good company rinses plants before and after and controls runoff.

Ask for a certificate of general liability insurance of $1,000,000 or more and confirm the L&I registration. Get a written quote with each surface itemized and confirm whether gutters and walks are included.

Check reviews from the last six months for mentions of siding damage, dead plants, and whether the moss came back. You can compare pressure washing companies serving Tacoma and Pierce County in our directory, and our blog covers what other home services cost across Washington.

Doing It Yourself

A rented pressure washer from a Tacoma or Lakewood home improvement store costs $70 to $110 per day. For a driveway or a patio, that is a reasonable weekend project.

Roofs are the place to stop. Walking on a wet, mossy roof is one of the most dangerous things a homeowner can do, and applying moss treatment from the ground or a ladder is limited. Professionals use harnesses, roof ladders, and pump sprayers with extension wands.

Siding on a two-story house is also worth hiring out. Ladder falls are common, the chemical mix for a soft wash is easy to get wrong, and cedar siding does not forgive high pressure.

For most Tacoma homeowners, the split that works is renting for flat concrete and hiring out roof and siding, which keeps the annual spend around $500 to $900.

Frequently Asked Questions

How much does it cost to remove moss from a roof in Tacoma?

Treatment alone runs $250 to $500 and cleaning plus treatment runs $500 to $1,100 for an average home. Steep roofs and heavy moss cost more.

How often should I treat my roof for moss in Tacoma?

Every one to three years, with shaded roofs under fir and maple on the short end. Late fall and early spring are the best times.

Will pressure washing damage my cedar siding?

Yes, high pressure furs up cedar and strips paint. Reputable companies soft wash wood siding with low pressure and a cleaning solution.

Do pressure washing companies need a license in Washington?

Companies doing work beyond basic cleaning need to register as contractors with Labor and Industries. Ask for the L&I number and look it up before hiring.

Is it okay to pressure wash my roof myself?

No. High pressure damages asphalt and cedar shingles, and walking a wet mossy roof is a fall risk. Hire a company that uses low-pressure treatment and proper fall protection.