What to Expect From a Professional Pressure Washing Service

Professional pressure washing covers your whole property, but results depend on what you're cleaning and how dirty it is

A pressure washing service typically cleans exterior surfaces using high-pressure water spray—driveways, decks, siding, fences, and sometimes roofs or gutters. The work is straightforward: a technician arrives with equipment, sprays your surfaces, and leaves them noticeably cleaner. What "complete" means in practice varies. Some companies clean everything you ask for in one visit. Others charge extra for certain surfaces, use different pressure levels for different materials, or recommend follow-up treatments for stubborn stains. Before you hire, ask exactly which surfaces the quote covers and whether the price includes all of them or adds charges as the job goes.

The quality of the result depends partly on the dirt itself. Mold, mildew, and algae on a shaded deck may need a gentler approach or a chemical treatment before pressure washing. Concrete stained by oil or rust may require specialized cleaning. A reputable company will tell you upfront if a surface needs something beyond standard pressure washing, and what that costs. If a company promises every stain will vanish under any circumstance, that's a sign to ask more questions or get a second opinion.

Key Takeaways

• A complete pressure washing job should specify which surfaces are included—driveway, deck, siding, fence—and whether any surfaces cost extra.
• Some stains (oil, rust, heavy mold) may need chemical treatment or specialized cleaning in addition to pressure washing, which often costs more.
• Pressure washing can damage certain materials if the pressure is too high, so a professional should adjust settings for wood, vinyl, and painted surfaces.
• Ask whether the quote is a flat rate for the whole property or an hourly rate, and whether travel time or setup fees apply.

What surfaces a typical pressure washing job covers

Most pressure washing companies include driveways, patios, and concrete walkways as standard. These are durable surfaces that tolerate high pressure well. Many also offer deck and fence cleaning, though wood requires lower pressure to avoid splintering or gouging. Siding—whether vinyl, wood, or brick—is often included but may need gentler pressure settings.

Gutters, roof cleaning, and second-story work usually cost extra because they require special equipment, safety measures, or ladder work. Some companies bundle these into a "complete" package; others treat them as add-ons. Ask your quote to break down which surfaces are included in the base price and which are separate. This prevents surprises when the bill arrives.

When pressure washing alone isn't enough

Stubborn stains—rust, oil, heavy mold, or algae—often don't come clean with pressure alone. A professional may recommend a pre-treatment with a chemical cleaner, which sits on the surface for a set time before pressure washing. This adds time and cost but produces better results on heavily soiled surfaces.

Some companies include one pre-treatment in their quote; others charge separately. Mold and mildew on shaded areas like north-facing decks or under trees may also need a follow-up treatment to prevent quick regrowth. Ask whether the company offers this and what it costs. A realistic estimate will mention these possibilities upfront rather than discovering them mid-job.

Pressure settings and material safety

Pressure washers range from about 1,500 PSI (pounds per square inch) for delicate work to 4,000 PSI or higher for concrete. A technician should adjust the pressure for each surface: lower for wood and vinyl, higher for concrete and brick. If a company uses the same pressure on everything, surfaces like wood siding or composite decking can be damaged—splintered, gouged, or stripped of finish.

Before work begins, confirm that the technician knows which surfaces need lower pressure. If you have vinyl siding, composite decking, or painted wood, mention it explicitly. A professional will ask about your home's materials and adjust accordingly. If they don't ask, that's worth noting.

Pricing: flat rate versus hourly

Some companies quote a flat rate for the whole job based on square footage or a site visit. Others charge hourly, which means the final cost depends on how long the work takes. Flat-rate quotes are easier to budget for; hourly rates can climb if the job takes longer than expected—especially if surfaces are dirtier than anticipated or require extra treatments.

Ask whether the quote includes travel time, equipment setup, or cleanup. Some companies factor these into the price; others add them on. A clear quote lists everything included and everything that costs extra, so you know the total before work starts.

What to ask before hiring

Request a written quote that lists each surface being cleaned and the price for each. Ask whether the company is insured and bonded—this protects you if equipment damages your property or someone is injured. Find out how long the work typically takes and whether the company can complete it in one visit or needs multiple days.

Ask about the company's experience with your specific surfaces. If you have a delicate wood deck or historic brick, mention it. A company that regularly works with those materials will know how to clean them without damage. Also ask what happens if you're not satisfied with the results—do they offer touch-ups or a warranty on the work?

Frequently Asked Questions

Will pressure washing damage my deck or siding?

High pressure can splinter wood, crack vinyl, or strip paint if the technician uses the wrong setting. A professional adjusts pressure based on material—lower for wood and vinyl, higher for concrete. Before hiring, confirm the company knows your surfaces and will use appropriate pressure for each.

How long does a complete pressure washing job take?

A typical residential job takes two to four hours depending on property size and how dirty surfaces are. Heavily soiled areas or chemical pre-treatments add time. Ask your contractor for an estimate before they arrive so you can plan your day.

Do I need to do anything to prepare for pressure washing?

Move outdoor furniture, toys, and potted plants out of the way. Close windows and doors. If you have delicate plants near the work area, let the technician know so they can protect them or adjust their approach. Some companies ask you to stay inside during the job for safety.

What if the stains don't come completely clean?

Some stains are permanent—rust in concrete, deep oil marks, or wood discoloration. A professional should tell you upfront if a stain likely won't come out completely. Ask whether a follow-up treatment or specialized cleaning might help, and what that would cost.

How often should I have my property pressure washed?

Driveways and patios typically benefit from pressure washing every one to two years depending on climate and foot traffic. Decks and siding may need it less often. Shaded areas prone to mold may need more frequent cleaning. Your contractor can recommend a schedule based on your property's condition.