Pressure washing in Coeur d'Alene

What a wash costs in Coeur d'Alene

An average home exterior runs $275 to $715, priced from $0.30 per square foot. Most jobs are a half day to a full day. Four things decide where you land in that band.

How many surfaces are on the list. A driveway alone is a short visit. Siding, soffits, two walkways, a patio, a fence and a deck is four setups, four different tips, and two different detergents. Surface count moves the price more than square footage does.

How much is growing. Light dust rinses off. Moss with a root system in the wood grain, or the black algae streaking a north wall, needs a cleaner and real dwell time before anything gets rinsed. That is time on the clock.

Access. A two story wall on a sloped lakeside lot means ladders or a longer wand and a slower pace. Flat lots in the newer parts of Post Falls and Hayden wash faster than the older, tighter lots near downtown.

What has to be protected. Mature plantings, a well head, a lake bank, an unsealed deck below the work. Protection and rinse-down are part of the job and they take time.

Bundling changes the math. A crew already on site with hoses run and plants covered can add the walkway or the back patio for far less than a separate trip would cost, because setup and teardown are a real share of a small job. If the driveway is on your mind at all, put it on the first quote rather than calling back in August.

Our pressure washing page lists the same numbers. Ask for the quote as a fixed price with the surfaces named, so nothing gets discovered later.

Pressure washing prices in Coeur d'Alene, ID

Surface count moves the price more than square footage does, because every change of surface means a different tip, a different pressure and a different cleaner.

Why North Idaho houses get green on one side

Coeur d'Alene winters are wet and dark. November is the wettest month of the year here at around 3.2 inches, humidity in January sits near 84 percent, and January is the cloudiest month at roughly 74 percent overcast. A north-facing wall in that stretch barely dries between rains.

That is the whole explanation for the green film on your north side and the black streaking under the eaves. Algae and moss need moisture and shade, and this town supplies both for five months straight. Lots under heavy conifer cover, and shaded parcels near Lake Coeur d'Alene, Hayden Lake and Hauser Lake, hold it worse than open ground does.

Late summer adds a second layer. Wildfire smoke is a regular part of the Panhandle calendar, and Idaho DEQ has issued air quality advisories covering Kootenai, Benewah, Bonner, Boundary and Shoshone counties. Wildfire ash is alkaline, running around pH 11 to 12 where it piles up outdoors. It lands on siding and on flat concrete, sits through the dry weeks, then the first fall rain drags it down the wall as a caustic film.

Then winter comes back around. Road sand tracks onto driveways and grinds into the concrete. Ice melt leaves a haze. Snowmelt running off cedar or a bark bed puts tannin stains on flat work that will not come out with a hose.

Four different soils, four different chemistries, one house.

That is why a wash here is a cleaning problem rather than a pressure problem, and why the detergent step is the part worth paying for.

What pressure is safe on what

The single most useful thing to know before anyone points a wand at your house is that pressure is matched to the surface, not to the dirt. Here is where the numbers sit.

Heat does work that pressure cannot. Commercial hot water systems run in the 200F to 250F range, and on oil spots or greasy soil, temperature beats pounds per square inch every time.

A bid that does not distinguish between your cedar trim and your concrete driveway usually means one tip is going across both.

Why chemistry beats pressure on siding

Pressure removes what is sitting on top. Chemistry kills what is living in the surface. Those are two different jobs and only one of them keeps the wall clean past next spring.

Moss and algae are not a coating. They have structures down in the wood grain and in the pores of concrete. Blast the visible growth off and the wall looks perfect for a few months, then the same streaks come back in the same places, because nothing that mattered was removed.

Soft washing solves it in the opposite order. A cleaner goes on at low pressure, gets time to work, then everything gets rinsed at a pressure the substrate can take. Dwell time is the active part of that sequence, and it is the step a rushed crew cuts because it looks like standing around.

The detergent also lets you cut the pressure roughly in half on anything delicate. That is the trade every good washer makes on cedar and on aged paint.

We use eco-safe detergents, and the handling that goes with them matters as much as the mix.

• Plants get soaked with clean water before the cleaner goes near them, and rinsed again afterward.
• Light fixtures, outlets, and any gap around a door get covered or taped.
• On lakefront and creekside lots, runoff gets directed to soil rather than to a storm drain or the bank.
• Windows get rinsed, since dried detergent on glass spots worse than the dirt did.

Ask any bidder what they do about the growth rather than what pressure they run. The answer separates people quickly.

How to read a pressure washing quote

These quotes are short, which is exactly why they hide things. Four items should be on the page.

• Every surface, named. Siding, soffits and fascia, front walk, driveway, patio, fence, deck. If it is not written down it is not in the price, and the driveway is the most commonly assumed-but-excluded item on a house wash.
• A detergent step, with dwell. The words "pressure wash" describe a machine, not a method. You want the cleaning step called out separately from the rinse.
• Plant and fixture protection. Pre-wetting, covering, and a final rinse-down.
• Exclusions. Window interiors, gutter interiors, roofs and anything already failing. A quote with no exclusions is a quote that has not been thought through.

Ask how they measured. Pricing starts at $0.30 per square foot here, and you should be able to tell whether the number came from wall area, flat work, or both.

Ask about water. Most crews run off a household spigot, which means your water bill and your pressure. A crew that shows up with a buffer tank is less likely to stall out on a slow well line, and plenty of lots out toward Hauser Lake and Twin Lakes Village are on wells.

Then ask the question that saves arguments later. What is likely to look worse after this, rather than better. Oxidized aluminum and chalking paint can both come out looking uneven once the dirt that was hiding the problem is gone. A washer who tells you that up front is the one to hire.

How the day runs

Half a day to a full day for an average home exterior. The order is fixed for a reason.

1. Walk the house first. Loose siding, split trim, open window gaps, failed caulk at a fixture, screens that should come out. Anything found now is a note, and anything found later is an argument.
2. Protect. Plants soaked, fixtures covered, outlets taped, doors and windows checked shut.
3. Apply cleaner low to high. Going bottom up stops the cleaner from running over dry siding and streaking it.
4. Let it dwell. This is where moss and algae actually die. Keep the surface damp so the cleaner is still working, rather than drying on the wall.
5. Agitate where it is needed. A soft brush on heavy moss at the base of a north wall does more than another 500 psi would.
6. Rinse top down. Pressure matched to the surface, tip angled downward so nothing gets driven up under the laps.
7. Flat work with a surface cleaner. Driveway, walks and patio, in overlapping passes so the slab comes out even.
8. Final rinse and walk it with you. Plants get soaked again, glass gets rinsed, and you look at the result while the crew is still on site.

Two things slow a day down more than dirt does. A slow water supply, which is common on well lots, and a house with a lot of separate small surfaces, since every change of surface means changing the tip and often the cleaner.

Drying comes next and it matters if paint or stain is following. Siding should read under 15 percent on a moisture meter before any coating goes on it, and TWP calls for a minimum of 48 hours of good drying weather after a wash before stain. In July that is quick. In late September, plan on more.

How a wash damages a house

Every one of these is something a machine in the wrong hands does in about four seconds.

Raised grain on cedar. Too much pressure on soft wood tears out the light spring growth and leaves the hard grain standing. The wall goes fuzzy, it holds dirt from then on, and the fix is sanding rather than washing.

Water driven behind the siding. Angling a tip upward under lap siding or into a window head pushes water into the wall cavity. It shows up a week later as a stain on an interior ceiling or a soft spot in drywall, and by then nobody connects it to the wash.

Zebra striping on concrete. A hand wand cuts a narrow band of clean and leaves a shadow beside it. On a driveway, those stripes are permanent until the whole slab gets recut with a surface cleaner.

Blown mortar joints. Old soft mortar on a brick chimney or a foundation face washes out at pressures that feel modest. Replacing it is masonry work.

Dead plantings. Cleaner applied over dry foliage with no pre-soak and no rinse. Established shrubs against a foundation are the usual casualties.

Paint stripped off in sheets. This one is more diagnosis than damage. Sound paint survives a properly matched wash. If it comes off, it was already failing, and the honest response is to stop and reprice the job as exterior painting rather than keep going.

Renting a machine, and where that goes wrong

The rental units at the box stores on Government Way generally run 2,500 to 3,100 psi with a tip set in the box. Look back at the pressure table. That machine is above the safe working range for every siding material on the list, and the tips are the only thing standing between it and damage.

The red zero degree tip should never touch a house. It exists for stripping equipment and cutting through caked material on concrete, and it will cut wood or etch a slab in a single pass.

Two DIY jobs work well here. A driveway with a rented rotary surface cleaner comes out even and is genuinely satisfying. A wood fence at low pressure with a deck cleaner is a good Saturday.

Hand it off when any of these applies.

• Anything above the first floor. A pressurized wand has real reaction force, and reacting to it while standing on a ladder is how people come off ladders.
• Cedar, fiber cement or old paint. The margin between clean and damaged is narrow, and it is not obvious until the wall dries.
• Heavy moss or algae. Without the right cleaner and dwell you are rearranging it, not removing it.
• Runoff that has to be controlled. Lakefront and creekside lots need the water going into soil.

Prepping for stain is its own sequence. Our deck staining page covers the wash and brighten steps that have to happen before any finish goes on.

When to wash, and what it buys you

Once a year covers most Coeur d'Alene homes. Late fall is the slot we like, after smoke season has ended and before the wet months lock in, because that takes the ash and the summer dust off before they sit under five months of moisture.

Spring is the second best option, especially on lots with heavy conifer cover, where needles and pitch pile up over winter.

Two schedules run shorter. Shaded north walls near the water often want attention twice a year, and flat concrete that takes winter road sand does better with a spring pass regardless of when the house was done.

A few things push the interval the other way. Open lots with good sun and wide roof overhangs stay clean longer, and a house whose gutters actually carry water away from the walls will go two years between washes without looking neglected. Growth on siding is usually a drainage story before it is a cleaning story.

Washing before painting is not optional. A coating bonds to the substrate or to whatever is on the substrate, and mildew, chalk, ash and old sprinkler overspray all sit in the second category. That is why a wash is usually built into an exterior repaint scope rather than billed on its own.

Timing matters on the back end too. Wood siding has to come back under 15 percent moisture before paint, and a deck needs at least 48 hours of drying before stain. Washing a house on Friday to paint it Saturday is how a good prep step becomes the reason a job fails.

What a yearly wash actually buys is time on the coating you already paid for. Growth holds moisture against a wall, moisture is what breaks a paint film, and $275 to $715 spent once a year is cheap next to a repaint at $3,850 to $10,400.

Our pressure washing work carries a satisfaction guarantee. If you want a walkthrough and a fixed number, the quote form takes a minute.