If you own a home in Lexington, Columbia, Irmo or anywhere around Lake Murray, you have probably asked how often you should wash your house. There is no single number for every home, but there is a reliable way to work out the right schedule for yours.
In South Carolina the honest answer is usually more often than people expect, because our climate is ideal for the things that stain a house: warmth, humidity, shade and pollen.
Why South Carolina homes get dirty faster
Humidity. Long, warm, damp stretches are exactly what algae and mildew need. Homes near Lake Murray get even more moisture in the air, and it settles on north-facing walls and shaded areas.
Shade. Pines and oaks drop needles, leaves and pollen, and they keep siding and roofs shaded and damp. A wall that rarely sees full sun stays wet longer, which is where green streaks start.
Pollen. Every spring a yellow film settles on everything. It is not harmful on its own, but it holds moisture and gives algae a place to grow. See our guide on spring pollen and your exterior.
Mild winters. Growth slows in cold weather but rarely stops completely in the Midlands.
A good starting point: every one to two years
For many homes in Lexington, Irmo, Red Bank and Chapin, washing the exterior roughly every one to two years keeps buildup manageable. Adjust that using these factors:
- Heavy shade and lots of trees: lean toward yearly, or at least check the shaded sides every year.
- Lake-front or low, damp lots: algae returns faster, so lean toward the shorter end.
- Open, sunny lots: you may stretch toward two years or longer.
- Light-colored siding: shows stains sooner than dark siding.
- Vinyl, painted or stucco siding: all show algae and mildew, and should be cleaned gently.
Signs it is time to wash your house
Skip the calendar and look at the house. These signs mean it is ready:
- Green or black streaks on siding, especially low on the north side.
- A gray or powdery film when you rub your hand on the siding.
- Dark streaks running down the roof.
- Green, slippery patches on the driveway, walkways, steps or deck.
- Dirty window frames and sills, cobwebs and wasp nests under the eaves.
- A “tired” look compared with the neighbors’ homes.
If you see two or three of these, it is time.
How often to clean each part of your home
Not everything needs washing at the same time.
| Surface | Typical frequency |
|---|---|
| House siding | Every 1 to 2 years |
| Roof | When streaks appear; do not wait for it to get severe |
| Driveway and walkways | Every 1 to 2 years, sooner if slippery |
| Decks and fences | Every 1 to 2 years |
| Windows | Once or a few times a year |
| Gutters | At least once a year under pines or oaks |
For details on each, see our pages for house washing, roof soft washing, driveway cleaning, deck cleaning, window cleaning and gutter clean-out.
A seasonal rhythm that works in the Midlands
- Late winter: clear gutters and look over the roof from the ground before the growing season starts.
- After pollen season (late spring): wash siding, clean concrete and do windows last, so everything is fresh for summer.
- Fall: walk around the house and look for green streaks, leaf buildup and anything to fix before winter.
The cost of waiting
Algae and mildew are not only cosmetic. On a roof, growth holds moisture against the shingles. On siding, it keeps surfaces damp and stains can set in. On concrete and decks, it makes surfaces slippery. Cleaning while buildup is light is easier and gentler than waiting until it is heavy and stubborn.
There is curb appeal too. If you plan to sell, refinance or host an event, a fresh wash is one of the simplest ways to make a home look cared for. Our post on cleaning your exterior before selling covers this in more detail.
Best time of year to wash your house
There is no wrong season, but a few times work well:
- Late spring, after the heaviest pollen, gives you a clean look for summer.
- Early fall clears summer growth before winter and holiday guests.
- Before listing a home: schedule a wash a week or two before photos and showings.
We avoid washing in heavy rain or high wind and will tell you if we need to reschedule.
Does washing too often hurt?
Soft washing is gentle, so cleaning every year or two is fine for most surfaces. Frequent high-pressure washing is the thing to avoid, because force can wear down siding, paint and shingles over time. That is one more reason to choose soft washing instead of pressure washing on siding and roofs.
Questions we hear
Can I just rinse the house with a hose? A hose removes loose dust and pollen, which is useful between washes. It will not remove algae or mildew that has taken hold.
Will cleaning more often make the next wash easier? Yes. Light buildup comes off faster and more gently than heavy, stubborn growth.
Does the size of my home change the schedule? Not the schedule, but the job. Bigger and taller homes take longer and are harder to reach safely, which is a good reason to bring in a professional.
How to decide
Walk around your house once a year in good light and look at the north side, the roof, the driveway and the deck. If you see the signs above, it is time. If everything looks fine, wait and check again next year.
Not sure what you are looking at? Send us a photo with a free quote request and we will give you an honest opinion. You can also call (803) 528-1996. We serve Lexington, Irmo, Chapin, Red Bank, Ballentine, Gilbert and Columbia, and we respond within 24 hours.