How much does deck and patio power washing cost?

Deck and patio power washing in the Chicago area starts at $180 for decks or patios between 100 and 299 square feet without railings, or $220 with railings. Mid-size surfaces (300–499 sq ft) run $350–$430. Larger areas 700 sq ft and up start at $400–$520. Final price depends on surface type, condition, and railing complexity. Call (224) 394-4494 for a free estimate.

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Deck & patio power washing

Restore your outdoor living space. We safely clean wood decks, composite decking, pavers, brick, and stone patios across Chicago and the suburbs.

Insured & Licensed

Safe Soft-Wash for Decks

4.9 ★ Google Rating

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and receive $25 off your next cleaning

Wood, composite, pavers & stone — we clean them all safely.

Professional-grade equipment — not a store-bought washer.

Ready for summer entertaining — book before the season starts.

Window Washing Expert technician surface cleaning a concrete pool deck patio — Professional surface cleaner on a concrete pool deck — even, streak-free results on large patio areas.

technician power washing a brick and stone paver patio — Brick and stone paver patio cleaning — algae, dirt, and grime removed from joints and surface.

Specialty Service

Why your deck or patio needs professional cleaning

Chicago's humid summers and freeze-thaw winters take a toll on outdoor surfaces. Deck boards turn gray, patios grow slippery algae, and embedded dirt makes your backyard look years older than it is. Regular cleaning is not just cosmetic — it protects your investment and keeps outdoor spaces safe to walk on.

At Window Washing Expert, we are not a guy with a Home Depot pressure washer. We use commercial-grade equipment, eco-friendly detergents, and surface-specific techniques to clean wood, composite, concrete, pavers, brick, and natural stone without causing damage.

Why homeowners trust us for deck & patio cleaning:

✓Remove algae, moss, and mildew that make surfaces slippery and unsafe.
✓Restore the original color of grayed wood and stained pavers.
✓Prepare decks for staining or sealing after cleaning.
✓Extend the lifespan of wood and composite materials.

What We Clean

Buildup and stains we remove from decks & patios

Chicago weather leaves a different mix on every outdoor surface. Here's what we encounter most often — and why each requires the right pressure and detergent.

Algae & Moss

Green and black organic growth on shaded decks and damp patios. Makes surfaces slippery and unsafe — we pre-treat and clean at the correct pressure for your material.

Gray Weathered Wood

UV exposure and moisture turn deck boards dull and gray over time. Professional cleaning restores the natural wood tone and prepares the surface for stain or sealer.

Embedded Dirt & Grime

Foot traffic, pollen, and years of buildup work into porous wood grain and paver joints. We use professional detergents to lift grime before rinsing clean.

Stains & Spills

Grease from grilling, rust from furniture, and food or drink stains on patios. We treat each stain type with the appropriate degreaser or cleaner.

Weeds in Paver Joints

Grass and weeds grow between patio pavers and along walkway edges. We clear joints and restore a clean, uniform look across the full surface.

Pollen & Leaf Tannins

Spring pollen and autumn leaf tannins leave a brown film on decks near trees. We remove seasonal buildup so your outdoor space stays presentable year-round.

Surfaces We Clean

Deck & patio cleaning for every surface type

Wood, composite, concrete, pavers, and stone each need a different approach. We match pressure and detergent to your material.

Wood Decks

Pressure-treated pine, cedar, and hardwood decks need controlled low-pressure cleaning. We clean boards, railings, stairs, and spindles without gouging grain or splintering boards.

✓Pressure-treated pine & cedar
✓Deck railings, stairs & spindles
✓Prep for stain or sealer after cleaning

Composite & Trex Decks

Composite and PVC decking requires soft-wash techniques with manufacturer-safe detergents. High PSI can void warranties and fuzz the surface — we follow composite cleaning guidelines.

✓Trex, TimberTech & similar brands
✓Low-pressure soft-wash method
✓Pergolas & built-in seating areas

Patios & Walkways

Concrete, pavers, brick, and natural stone patios take heavy foot traffic and weather exposure. We remove ground-in dirt, algae in joints, and slippery organic buildup from every hard surface.

✓Concrete & stamped concrete
✓Pavers, brick & natural stone
✓Walkways & pool surrounds

Why you should never DIY deck & patio power washing

Store-bought pressure washers are the leading cause of damaged decks and etched patio surfaces. Here's what goes wrong.

Too much pressure

Homeowners crank PSI to max and gouge softwood boards, raise grain, and fuzz composite decking. Once damaged, boards often need replacement — not just re-cleaning.

Wrong nozzle tip

A zero-degree pinpoint nozzle cuts lines into wood and strips the surface off pavers. We use fan tips and surface cleaners sized for each material — never a single blast point.

Skipping pre-treatment

Blasting algae without detergent just spreads it around and leaves streaks. Professional pre-treatment breaks down organic growth so the final rinse gives an even, lasting clean.

We use the right pressure, nozzle, and chemistry for your surface — backed by a full satisfaction guarantee.

How It Works

From booking to a restored outdoor space

We follow a consistent process on every deck and patio job — no surprises, no hidden charges.

Book appointment

Call or book online. Same or next day usually available.

Inspect & protect

We assess surface type, note problem areas, and protect plants and furniture.

Confirm price

We confirm the final cost before starting. No obligation.

Clean & rinse

Pre-treat, clean at correct PSI, and rinse every surface.

Walkthrough & pay

Not satisfied? We reclean or refund — no questions asked.

Wondering what it will cost? Deck and patio cleaning starts at $180 for smaller surfaces. See the full price chart below.

Transparent Pricing

Deck & patio power washing cost

Real pricing for the Chicago area. No hidden fees — final quote confirmed on-site before we start.

Deck and patio pricing by size

Deck / Patio Size
(sq ft)

Price
No Railing | With Railing

100 – 299$180 | $220
300 – 499$350 | $430
700 and up$400 | $520

✓We power-clean wood and composite decks and concrete, brick, or natural stone patios.
✓Railing add-on applies to deck jobs with spindles, handrails, and stair rails.
✓Heavily soiled or oversized surfaces may vary — we confirm price before starting.

See full power washing pricing on our main page for driveways and siding.

What's included

Pre-treatment & detergentIncluded

Surface-appropriate PSIIncluded

Full rinse & walkthroughIncluded

Every job includes inspection, plant protection where needed, and our satisfaction guarantee. Patio-only jobs use the “no railing” column; deck jobs with railings use the “with railing” price.

Example estimate

350 sq ft wood deck, no railing$350

Deck with railings & stairs$430

200 sq ft concrete patio$180

Typical deck job$350–$430

Every deck and patio is different — call for a precise estimate at no charge.

Coverage

Deck & patio cleaning across Chicagoland

We serve homeowners throughout the North Shore, North Cook County, and Lake County. Select your city for local power washing details.

Northbrook Wilmette Winnetka Lake Forest Arlington Heights Buffalo Grove Schaumburg Barrington Libertyville Grayslake

View all service areas →

FAQ

Deck & patio power washing — common questions

Answers to what homeowners ask most before booking.

Not when done correctly. We use controlled pressure and fan-tip nozzles on wood decks, never a zero-degree tip. Our technicians adjust PSI based on wood type and condition to remove algae and graying without gouging boards or raising grain excessively. DIY pressure washers often cause damage because homeowners use too much pressure or hold the wand too close.

Yes. Composite and Trex-style decking requires a low-pressure soft-wash approach with manufacturer-safe detergents. High pressure can void warranties, fuzz the surface, and strip protective coatings. We follow composite manufacturer guidelines and use soft-wash techniques designed for synthetic deck boards.

Deck and patio power washing in the Chicago area starts at $180 for surfaces between 100 and 299 sq ft (without railings), or $220 with railings. Mid-size areas (300–499 sq ft) run $350–$430. Larger decks and patios 700 sq ft and up start at $400–$520.

See our pricing table above or call (224) 394-4494 for a free estimate on your specific deck or patio.

Most Chicagoland homeowners benefit from deck or patio power washing once every 1–2 years. Shaded decks with heavy algae or moss may need annual cleaning. Patios under trees or in damp areas also accumulate organic growth faster. Regular cleaning prevents slippery surfaces and extends the life of wood and composite materials.

Yes. Algae, moss, and mildew are the most common reasons homeowners call us for deck and patio cleaning. We pre-treat affected areas with biodegradable detergents, then clean at the correct pressure to remove green and black organic growth without damaging the surface. The result is a safer, non-slip outdoor space.

Late spring through early fall is ideal for deck and patio power washing in the Chicago area. Temperatures are warm enough for surfaces to dry properly, and it is the best time to clean before summer entertaining or before applying deck stain or sealer. We work April through October and can often schedule within a few days.

Need more than deck and patio cleaning? We also power wash house siding, driveways, walkways, and commercial exteriors. Visit our main power washing services page for full service details and siding pricing.