What Baton Rouge homeowners pay to have a deck cleaned, how size, material, and Louisiana's humidity-fed mildew move the price, and why a wood deck needs low-pressure soft washing instead of a hard blast.
Most deck cleaning jobs around Baton Rouge land somewhere between about 150 dollars for a small, open deck and 450 dollars or more for a large, multi-level or heavily shaded one, which works out to roughly 1 to 3 dollars per square foot. There is no single flat rate, because the price follows the deck's size, what it is built from, how many rails and steps it has, and how much of our Gulf-humidity mildew has settled into the boards. Here is an honest look at what moves the number.
A deck can be a 10-by-12 slab off the back door or a wraparound, two-level structure with built-in benches and a pergola, and those are completely different jobs in time, product, and care. The cost comes from measuring the actual square footage, counting the rails and steps, and seeing how deep the green-black growth has gone, not from a rate card. A crew that quotes one flat figure for any deck sight-unseen is guessing.
Pressure-treated pine and cypress decks are the most common around Baton Rouge and the most involved to clean. Wood is porous, so mildew and algae work down into the grain and the boards have to be soft washed at low pressure and given time for the solution to lift the growth. Composite and PVC decking clean faster because the film sits on a sealed surface and rinses away once a detergent has broken it down, though composite still needs gentle pressure so the cap layer is not marred. Whatever the deck is made of, the slick green-black coating our humidity grows comes off with a cleaning solution rather than raw pressure.
It is tempting to aim a narrow tip at a stained deck and blast it back to bare wood, but on decking that is exactly how the damage happens. High pressure furs the grain, raises splinters, and carves visible wand stripes into the boards, and it can tear out what is left of a stain or sealer. The mildew and algae are living growth, so the right approach is a soft-wash detergent that kills them at the root before a low-pressure rinse carries them off. The deck comes back evenly clean with no striping and the wood intact, ready to re-seal if you choose. We use the same low-pressure care on covered patios and railings on our deck and patio cleaning in Baton Rouge.
Cleaning and sealing are two different steps. A wash removes the mildew, algae, and gray weathering and leaves the wood bright, but it does not protect it. If your deck has never been sealed or the old finish has worn thin, the best time to re-seal is a few dry days after the wash, once the wood has fully dried out. In our climate that drying window matters, because sealing damp wood traps moisture and leads to peeling. You do not have to seal to have a clean deck, but if you want the color to last and the boards to shed our frequent rain, a fresh coat after cleaning is worth budgeting for.
Usually, yes. Adding a deck to a visit already booked for a house wash or driveway spreads the setup, water, and trip charge over more work, so it typically costs less than booking the deck on its own. A deck is also the natural companion to a house wash, since freshly cleaned siding only makes a mildewed deck look worse beside it. If you are unsure whether your wood deck wants a wash or a full soft-wash treatment, our guide to soft washing versus pressure washing walks through the difference.
Because so much depends on size, material, railings, and how much growth has set in, the surest way to know your cost is a quick look or a few photos of the deck, which lets us give upfront, flat pricing before any work begins. Washing before the mildew digs deep into the grain also keeps the price down and the wood in better shape. Get a quote across all of our Baton Rouge pressure washing services.
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