How Often Should You Pressure Wash Your House?
Most houses should be pressure washed (or soft washed) every 1 to 2 years. Homes in shady, humid or heavily treed areas often need it annually, while exposed, sunny homes can sometimes stretch a little longer. The right interval depends on your siding, your surroundings and how quickly green and black growth returns.
Signs Your House Needs Washing
You don't have to track the calendar — your house will tell you. Walk the perimeter and look for:
- Green algae or black streaks on siding, especially on the north and shaded sides
- A chalky, dull film that dulls the color of your siding
- Dark "tiger stripes" running down gutters
- Spiderwebs, wasp nests and dirt collecting under eaves
- Slippery green film on the porch, steps or walkways
If you can see growth from the curb, it's time.
What Changes the Timeline
Shade and trees
Surfaces that stay damp grow algae fastest. A home tucked under mature trees may need annual washing, while a sun-exposed home dries quickly and stays cleaner longer.
Siding material
Vinyl and painted surfaces show streaking sooner and should be soft washed, not blasted. Brick and stone are more forgiving but still trap mildew in shaded spots.
Surroundings
Nearby fields, lots of landscaping, sprinklers hitting the siding, and high humidity all speed up organic growth.
The Michigan Factor
Southeast Michigan's mix of humid summers, heavy tree cover and long damp shoulder seasons is friendly to algae and mildew. For most homes here, an annual or every-other-year soft wash keeps siding bright and stops growth before it stains permanently. The best window to wash is late spring through early fall, when temperatures stay safely above freezing — spring is especially popular for clearing winter grime and pollen.
Not sure where your home lands? Tell us your city and siding type and we'll give you an honest recommendation with a free quote. We serve Northville, Novi, Plymouth, Canton and Livonia.
Frequently Asked Questions
Most houses need washing every 1–2 years. Shady, humid or heavily treed homes may need it annually; exposed sunny homes can go a little longer.
Late spring through early fall, when temperatures stay above freezing. Spring is popular for clearing winter grime and pollen.
Yes — too-frequent or too-high pressure wears paint, caulk and soft materials. A soft wash on a 1–2 year cycle is gentler and lasts longer.