DIY vs Professional Pressure Washing in Spokane

What does the DIY route cost?

Renting a gas pressure washer for a day typically runs somewhere in the $50 to $100 range in most markets, and consumer-grade electric units for purchase sit in a comparable band, according to the 2026 cost guides published by Angi and HomeGuide. Treat those as a national ballpark rather than a Spokane rental counter price.

That's not the whole number. Add the surface cleaner attachment, the detergent, the fuel, the deposit, the trip to pick the machine up and the trip to take it back, and most of a Saturday. Compare all of that against a professional estimate. Rental price on its own is not the comparison.

For what the professional side of that comparison looks like by surface, the Spokane pressure washing cost guide lays out the market ranges and the three factors that move them.

Where does DIY go wrong on a Spokane home?

The failures are consistent, and every one of them is pressure applied to the wrong surface.

• Water behind the siding. Spray angled upward under a vinyl lap forces water into the wall cavity, where nobody sees it until there's a stain on the drywall inside.
• Furred wood. Too much pressure on a deck or fence raises the grain, leaving a fuzzy surface that won't take stain evenly and needs sanding to fix.
• Striped concrete. The classic wand-only result. Visible from the street, and the only fix is redoing the whole slab properly.
• Lost roof granules. The expensive one. High pressure on asphalt shingles strips the protective layer, as the roof moss guide explains in full.
• Blown mortar and window seals. Older Spokane brick and aging glazing putty don't take a direct high-pressure hit well.
• The ladder. A pressure wand kicks back. Holding one at full trigger while standing on a ladder is how people end up on the ground.

Which jobs are not worth doing yourself?

Anything where the downside is a repair rather than a redo. That's a short list. The roof, second-story siding, any full house wash, a large driveway you want to look even, and commercial frontage where the result is part of how customers judge the business.

Roofs top the list for two separate reasons. Getting it wrong damages the shingles, and getting up there to do it is the real physical risk in this trade. A wet, mossy slope offers no traction, and Spokane spring mornings are exactly when people want to be up there.

House siding is the subtler one, because the damage is invisible on the day. Water forced behind a lap or into a gap around a window doesn't show up until a stain appears inside, months later. By then nobody connects it to that Saturday afternoon.

How do time and results compare?

Set the estimate aside for a second and count the day. Pickup, setup, learning the machine, the work itself, the second pass on the parts that didn't come clean, breakdown, and return. A full house exterior plus a driveway is not a morning for someone doing it once a year.

The results gap is mostly about knowing which surface takes what. Choosing a tip, setting a distance, mixing detergent, and knowing when a stain is going to lighten rather than disappear are learned things. Old oil in porous concrete will lighten and often won't vanish, and knowing that going in is the difference between a good outcome and a disappointing afternoon.

There's also the question of what happens if it goes wrong. A homeowner who furs a deck owns that sanding job. Work done by a local crew here carries a satisfaction guarantee, which is a different position to be in.