This is one of the most common questions we get. The short answer for Central Kentucky is every 12 to 24 months for the house itself, more often for some surfaces, less often for others.
The longer answer is, it depends on the house. Here's how to figure out where yours falls.
Why Kentucky Is Worse Than Most Places
Three things stack up to make exterior cleaning more frequent here than in drier climates:
- Humidity that doesn't quit. From late April through October we have humid days more often than not. Siding stays damp longer than it would in a drier climate. Damp siding grows mold, mildew, and algae.
- Mature tree canopy. Older neighborhoods like Chevy Chase, Ashland Park, and Kenwick have huge old oaks and maples shading entire properties. Shade plus humidity equals algae. North-facing walls in those neighborhoods can grow visible green inside a year. We see the same thing in Georgetown, like this house wash in Mallard Point.
- Limestone everywhere. The limestone in our soil and our water gives bacteria like Gloeocapsa magma plenty to feed on. That's the same bacteria that causes black streaks on roofs.
If you live somewhere drier you might get three to five years between washes. In Central Kentucky most homes need it every one to two years.
What Pushes Your House Toward the Faster End
- Heavy tree coverage, especially north and east of the house
- Vinyl or painted wood siding
- Light-colored siding that shows green growth more visibly
- Property near a creek, pond, or low-lying drainage
- HVAC condenser drips along a wall
- Gutters that overflow or drain on siding
What Pushes It Toward the Slower End
- Open lots with full sun exposure
- Brick or stone exteriors (don't grow algae as readily)
- Hardie board (more mildew-resistant than vinyl)
- Higher elevation lots with good airflow
- South-facing exposures that dry quickly after rain
Some homes we wash every spring like clockwork. Others stretch to two years no problem. We'll tell you which one yours is after the first job.
How to Tell It's Time
You don't have to wait for green stripes down the side of the house. By the time you see visible algae the underlying buildup is already months old. Earlier signs to watch for:
- A general dullness or dinginess to the siding even after a rain
- Black or gray streaks under window sills
- Green tint on the lower two to three feet of siding, especially on shaded sides
- Cobwebs and dust accumulation in eaves and corners
- Dirt staining around the foundation where rain splashes up
Walk around the house once each spring after the trees leaf out. If any of those signs are showing up, it's time.
What About the Roof, Gutters, Concrete, and Deck?
Different surfaces, different timelines.
- Roof cleaning: Three to five years on most asphalt shingles in this area. Sooner if it's heavily shaded or near pine trees. We use a soft-wash method that follows the Asphalt Roofing Manufacturers Association guidelines, never pressure washing.
- Gutters: Twice a year minimum. Once after pollen and seeds drop in late spring, once after the leaves come down in late fall.
- Concrete cleaning: Once a year keeps driveways and walkways looking right. Twice a year if you've got heavy tree cover or park multiple vehicles.
- Deck staining: Restain every two to three years on a properly maintained deck. Cleaning between staining isn't usually necessary unless something specific happens.
The Best Time of Year to Schedule
For house washing, May and September are the sweet spots. May gets the winter dirt off before summer humidity locks it in. September gets the summer growth off before it sits all winter under freeze-thaw cycles.
April fills up fast with first-of-season requests. If you want a May slot, calling in March is a good call. October fills up with people trying to get the house clean before holiday hosting.
Why Skipping Maintenance Costs More
The longer you wait, the harder the cleaning gets. Houses that haven't been washed in five to ten years often need two applications because the algae is so thick. The job takes twice as long and costs accordingly.
Worse, surfaces that go neglected too long can develop permanent staining. Painted wood that's grown mold for years sometimes shows ghost staining after cleaning. Concrete that's been sitting under organic buildup can pit and discolor.
Spending a few hundred dollars every year or two is cheaper than letting things go and dealing with permanent damage or premature replacement.
What This Costs in Lexington
House washing in the Lexington area runs between $449 and $850 for most homes. Bigger homes with two or three stories run higher. The price is based on size, height, and how dirty it actually is.
Repeat customers get priority scheduling and we send a reminder when it's been long enough since the last wash.
Call us at 859-312-0704 or send pictures and we can usually quote the same day.
