It’s one of the first questions people ask us: how often does my house actually need washing? The honest answer is that it depends on your siding, your surroundings, and the weather — but there are clear rules of thumb that hold up well here in the Metro East.
The short answer
For most homes in our area, a full exterior soft wash once a year keeps siding, soffits, and trim from building up the green and gray film that dulls a house over time. Some homes can stretch to every 18–24 months. Others — shaded lots, north-facing walls, anything near heavy tree cover — do better on a twice-a-year rhythm.
If you can already see green algae, black streaking, or a chalky haze on your siding, you’re past due. Those aren’t just cosmetic; algae and mildew hold moisture against the surface and slowly work into the material.
What changes the timeline
A few things push a home toward more frequent cleaning:
- Shade and tree cover. Less sun means slower drying, and slow-drying surfaces grow algae faster. Wooded lots in places like Edwardsville and Glen Carbon are classic examples.
- North-facing walls. The side of your house that never gets direct sun is almost always the first to green up.
- Nearby sprinklers or downspouts. Anything that keeps a wall damp accelerates growth.
- Siding color and material. Streaks and film show up far more on white or light vinyl than on darker or textured surfaces.
By surface, not just “the house”
Different parts of your property age on different clocks:
- Siding, soffits, gutters (exterior faces): once a year for most homes. This is a job for soft washing, not high pressure — more on why below.
- Driveways, sidewalks, and patios: every 1–2 years. These collect ground-in dirt, tire marks, and organic staining and genuinely benefit from a surface cleaner pass.
- Roofs: only when black streaks (that’s Gloeocapsa magma, a hardy algae) appear — usually every 2–4 years. A roof soft wash treats it without ever putting pressure on the shingles.
- Decks and fences: every 1–2 years to keep wood from graying and to prep for re-sealing.
Why “more pressure” isn’t the answer
A lot of homeowners assume a dirtier house just needs a stronger blast. On siding, roofs, and wood, high pressure is exactly the wrong tool — it can drive water behind panels, etch surfaces, and strip finishes. The right approach for most of a home’s exterior is a low-pressure soft wash that uses cleaning solution to kill the algae and mildew at the root, so it stays gone longer and the surface never takes a beating. That’s the difference we walk through in soft washing vs. pressure washing.
A simple maintenance rhythm
If you want a set-it-and-forget-it schedule, this works for most Metro East homes:
- Every spring: a full-house soft wash to clear the winter’s growth.
- Every 1–2 years: driveway, walkways, and patio.
- As needed: roof when streaks show; deck and fence before resealing.
Homes with heavy shade can move the house wash to spring and fall. That’s also where a recurring plan pays off — you lock in the schedule and usually a better rate than one-off visits.
Not sure where your house stands?
The easiest way to know is to have someone look at it. We’ll walk the property with you, point out what actually needs attention versus what can wait, and give you a free written estimate with no pressure to book. You can see recent before-and-afters in our gallery or request an estimate here.