Deck Power Washing and Staining Cost Guide (2026 Pricing)

Your deck's probably gray right now. Maybe green in the corners. Could be both. If you're somewhere in Cumming, GA or across Forsyth County trying to nail down what this project actually costs before somebody shows up with a pressure washer and a vague estimate, we're going to give you real numbers. We handle these jobs constantly, and deck size drives the price more than almost anything else.

A small 200-square-foot deck off a townhome costs a fraction of what a sprawling 600-square-foot wraparound runs. That gap is real. Homeowners nationally spend between $250 and $1,200 for deck washing and staining combined, with most projects landing somewhere in the middle depending on square footage and condition.

Here's what most cost guides get wrong. They hand you a flat per-square-foot number and call it a day. But a deck that hasn't been touched in four years takes way more labor than one that got cleaned last season. We see this constantly. A homeowner gets a quote based on size alone, then can't figure out why the number shifts once we show up and the wood is gray, fuzzy, and pulling apart at the edges. Size tells part of the story. Condition tells the rest.

Small decks, roughly 100 to 250 square feet, are the simplest jobs. Power washing goes fast. Drying time is predictable. Stain application is straightforward. Often single-day projects. But even a small deck in rough shape can pile on labor hours you wouldn't expect. Last spring we worked a 180-square-foot deck in Cumming where the previous stain had peeled so badly we needed two full cleaning passes before the wood would accept anything new. Size was small. Time was not.

Mid-size decks, 250 to 500 square feet, are the most common project type we handle. This is where variables stack up fast. Multi-level decks fall into this range often, and each level adds complexity. Railings, stairs, built-in benches. They all increase the surface area beyond what the floor plan suggests. A 350-square-foot deck with a full railing system and two stair runs is not the same job as a flat 350-square-foot platform. More time on prep. More stain covering the detail work. Bigger bill.

Large decks, 500 square feet and above, almost always span two days if you do them correctly. The wood needs time to dry thoroughly after washing before stain goes down, and rushing that step on a large surface leads to adhesion problems later. Improper prep is the leading cause of premature stain failure on exterior wood surfaces.

Deck material plays into this too. Pressure-treated pine is the most forgiving and most common around here. Composite decking gets washed but never stained, which changes the scope entirely. Hardwoods like Ipe or Tigerwood require lower pressure settings and specialty stains, affecting both time and material cost. We've worked on a handful of Ipe decks in newer Forsyth County neighborhoods, and the cleaning process alone takes longer because you simply can't blast hardwood the way you would pine.

Square footage on a deck is almost always underestimated. People measure the floor and forget the railings, the fascia boards, the stair stringers. On a 400-square-foot deck with a full perimeter railing and one stair run, the actual stainable surface can easily reach 550 to 600 square feet once you account for all the vertical surfaces. We measure everything before quoting. It's the only way to give you an honest number.

Understanding how size and condition interact gives you a realistic picture before anyone shows up at your door. If you want to see how these factors apply to your specific deck, our deck staining service page walks through what the process looks like from start to finish.

Same mistake. Every spring. Homeowners here in Cumming, GA and across Forsyth County either blast the deck with a pressure washer and call it done, or slap a fresh coat of stain right over a dirty surface. Both shortcuts cost more in the long run than doing the job right the first time. Here's what each approach actually does. And what it doesn't.

Power Washing Alone

Power washing strips mold, mildew, algae, and years of ground-in grime. That matters beyond the cosmetics. Moisture-trapping organic buildup accelerates wood fiber breakdown faster than UV exposure alone. So washing has real protective value.

Most guides skip this part. Power washing opens the wood grain. The fibers swell and lift. Stop there without sealing or staining within a reasonable window — typically 24 to 72 hours depending on humidity — and that open grain becomes a direct pathway for moisture. You've basically prepared the wood to absorb damage instead of repel it. Not great.

We pulled a job last summer on a Cumming neighborhood deck where the homeowner had power washed in April and never followed up. By August, the boards had gray-checked and two of them had started to cup. A simple stain application after washing would've locked that moisture out entirely. Fixable situation. Didn't have to happen at all.

Power washing alone makes sense in exactly one situation: a mid-season rinse on a deck that was properly sealed less than a year ago.

That's it.

Staining Alone

Staining over a dirty or weathered surface is one of the most common deck mistakes we see. The stain bonds to whatever's sitting on top of the wood, not the wood itself. So it bonds to mold spores, oxidized gray fibers, and old failing stain. The new coat looks fine for about one season. Then it peels in sheets.

Georgia's climate makes this worse. Forsyth County gets real humidity swings. Hot and wet summers followed by drier, cooler winters. That expansion and contraction cycle is brutal on a stain layer that never properly bonded. Surface preparation is the single biggest factor in how long an exterior wood finish lasts. Not the product. The prep.

Staining alone without washing first is almost always a waste of money. There's one exception: brand-new pressure-treated lumber installed within the last few weeks that's never been stained. And even then, most installers recommend waiting 30 to 90 days for the wood to dry before applying any finish.

Doing Both Together

This is the approach that actually protects your investment. Wash first. Let the wood dry completely. Then stain. The wash removes everything that would prevent proper adhesion, and the stain penetrates clean, open wood fibers and forms a real bond. The sequence matters as much as the steps themselves.

We've seen homeowners reverse the order. Stain first, then decide to wash. And the pressure washer strips the fresh stain right off. Two days of work and product cost gone in twenty minutes. The order really does matter.

Doing both in the right order extends the time between maintenance cycles. A properly washed and stained deck in Forsyth County's climate holds up noticeably longer before needing a full recoat, compared to a deck that was only partially treated. Decks that receive combined cleaning and sealing treatments are refinished less frequently over a ten-year period than those receiving single-service treatments.

One complete job now beats two partial jobs later. If your deck is past the point where a garden hose and an afternoon feel like the right answer, give us a call and we'll take a look.