What a good company looks like
A reliable pressure washing company is easy to verify and easy to understand. It can prove it is insured, it tells you what the job costs before work begins, it explains how it will clean each surface differently, and it has a plan for the dirty water. It also shows you real photos of its own work.
Most bad experiences come from skipping one of these checks. A low quote from someone who cannot answer basic questions often turns into etched concrete, streaked stucco or a surprise charge at the end.
This guide walks through each of those checks and the red flags that should send you elsewhere.
Insurance you can see, not just hear about
Pressure washing involves high-pressure water, ladders or lifts, chemicals near plants and work right next to windows, doors and cars. If something breaks, you want the company's policy to respond, not yours.
Ask for a certificate of insurance and read the dates. Commercial property managers usually require one before anyone sets foot on site, and homeowners should feel just as comfortable asking. A real business will send it without fuss.
Check that the name on the certificate matches the business you are hiring. If a company subcontracts the work, ask whose crew will actually show up and whose policy covers them.
Pricing that makes sense before anyone shows up
You should know how the price is built. Most companies price by area for flat surfaces and by length for fences and gutters. A clear rate lets you check the math yourself. As of October 2026, our calculator lists driveway cleaning at $0.50 per square foot and house washing at $0.35 per square foot of exterior wall, with a $195 minimum per visit.
Whatever the structure, the final number should be agreed before work starts. Be careful with quotes that change once the crew sees the job, vague add-ons for "heavy staining" that were never discussed, or a price that only exists over the phone.
The right method for each surface
Concrete, stucco, wood, clay tile, painted trim and roofs each need a different approach. Concrete can usually take higher pressure with a surface cleaner. Stucco, painted surfaces and roofs are usually soft washed, which means low pressure and a cleaning solution doing the real work. Wood needs care so the grain does not raise.
Ask how they would clean your specific surfaces. If the answer is the same wand and the same pressure for everything, keep looking. Pre-treatment, dwell time and a top-down rinsing order are signs of someone who knows the trade.
A plan for the wash water
In Los Angeles, Municipal Code section 64.70.02 prohibits discharging untreated wash water from paved-surface washing and mobile operations into the storm drain system unless a permit allows it. That matters for every driveway, sidewalk and parking lot job.
A professional should be able to tell you how they will keep dirty water and cleaning solution out of the gutter and storm drains on your property. For businesses this is especially important, since the job happens in a visible, public place.
Reviews and photos of real work
Read reviews for details, not just stars. Look for mentions of showing up on time, the price matching the quote, care around plants and a final walkthrough. A pattern of complaints about damage or surprise charges is worth more than one glowing review.
Ask for photos of jobs similar to yours, such as stucco walls, stamped concrete or a storefront. Stock images of spotless driveways tell you nothing about how a company works.
It also helps to ask how long they expect the job to take and what you need to prepare. Companies that do this work every day can answer both questions quickly, and their answers will tell you whether they have looked closely at your property.
Red flags to walk away from
Door-to-door crews offering a cheap deal today only, no written price, no proof of insurance, promises that every stain will vanish, and plans to blast stucco or wood at full pressure are all reasons to pass. So is anyone who shrugs off where the water goes.
For a deeper list, our guide to questions to ask before hiring a pressure washer covers what good answers sound like. If you want a starting number for comparison, the instant quote on this page gives you one in a minute.
Key points
What a good company looks like
A reliable pressure washing company is easy to verify and easy to understand. It can prove it is insured, it tells you what the job costs before work begins, it explains how it will clean each surface differently, and it has a plan for the dirty water. It also shows you real photos of its own work.
The right method for each surface
Concrete, stucco, wood, clay tile, painted trim and roofs each need a different approach. Concrete can usually take higher pressure with a surface cleaner. Stucco, painted surfaces and roofs are usually soft washed, which means low pressure and a cleaning solution doing the real work. Wood needs care so the grain does not raise.