How Often Should You Pressure Wash Your Houston Home?

Houston has one of the harshest exterior climates in the country for homes. The combination of year-round humidity, frequent rain, intense sun, pollen, and tree shade means surfaces that would stay clean for years in Phoenix or Denver start showing mildew within months here. The right pressure washing frequency depends on what surface you're dealing with — not the calendar.

This guide breaks down how often each surface on your home actually needs cleaning in the Houston / Gulf Coast climate, based on what we see in 500+ jobs across Memorial, Sugar Land, Katy, Pearland, and Cypress.

Driveways and Concrete: Every 6–12 Months

Concrete driveways and sidewalks are the surfaces that get dirty the fastest in Houston. Within 4–6 months of cleaning, you'll start seeing the early signs: black mildew spots in shaded areas, green algae streaks where water pools, dark tire tracks. By month 12, most untreated driveways have lost their original light gray color entirely.

If your driveway sits in full sun and drains well, 12 months between cleans is usually enough. If it's partially shaded (most Houston driveways are because of the live oaks), drop that to 8–10 months. If you have oil drips or organic debris (leaves, magnolia pods) sitting on it for weeks at a time, 6 months is realistic.

House Siding: Every 12–18 Months

Vertical surfaces stay cleaner longer than horizontal ones because rain rinses them naturally. But Houston humidity still allows algae and mildew to colonize siding, especially on the north and east-facing walls that get less direct sun.

• Hardie / fiber cement siding: 12–15 months. The most common siding in newer Houston subdivisions.
• Painted wood siding: 12 months. Paint film actually hosts more algae than fiber cement.
• Brick exterior: 18–24 months. The mortar joints attract more dirt than the brick itself.
• Stucco: 18 months. Holds dirt deeply, so worth cleaning before it builds up.

Roof: Every 2–3 Years

Houston's asphalt shingle roofs develop the dark vertical streaks you see on so many homes — that's gloeocapsa magma algae, and it feeds on the limestone filler in modern shingles. Once it starts, it spreads about 1 foot per year and gradually shortens shingle lifespan.

The Asphalt Roofing Manufacturers Association (ARMA) recommends a low-pressure soft wash for cleaning. Most Houston homes need this every 2 to 3 years. Houses under heavy tree shade — common in Spring and the Heights — should plan for every 2 years.

Avoid high-pressure cleaning of a roof. It will strip the granules off the shingles, dramatically shortening roof life and likely voiding your manufacturer warranty.

Fences: Every 18–24 Months

Wood fences in Houston (cedar, pine, pressure-treated) age fast. Six months after install they start to gray. By year 2 they're often green or black on the shaded sides.

A wash every 18–24 months keeps them in restoration range — meaning you can wash, brighten, and seal them and they look like new. If you let a fence go 5+ years untouched, it usually needs replacement boards before sealing, which costs significantly more.

Decks and Patios: Annually

Outdoor living areas in Houston need annual cleaning because they combine the worst of both worlds: horizontal surfaces (collect debris) usually with some shade (slower drying = more algae). A spring clean before pool season is the most common timing for Houston homeowners.

Windows: Every 3–6 Months

Window cleaning isn't strictly pressure washing, but it pairs naturally with one. In Houston, pollen season (February–April) and after major storms are the two times exterior windows really need attention.

Pool Decks: Every 6–9 Months

Pool decks are high-priority because algae growth becomes a slip hazard. Travertine, flagstone, and stamped concrete all hold organic film that gets dangerous when wet. Every 6–9 months is appropriate, with a check after fall leaf drop.

Adjust for Your Specific Property

Clean more often if:

• You have heavy tree cover (Memorial, Spring, the Heights)
• You're within a mile of a busy road (extra grime and exhaust film)
• You have a pool (chemical splash + algae proximity)
• You have an HOA that issues compliance letters
• You're listing the house for sale (clean = higher offers)

Clean less often if your home is full-sun, dry, in a newer subdivision with smaller trees, or you've recently applied a surface sealer.

If you're not sure where your home sits on the schedule, the easiest path is a free PrimeStar Wash assessment — we'll tell you exactly which surfaces are due and which can wait. Get a quote here or call 832-329-2641.