How Often Should You Pressure Wash Your House in Iowa?

Most Iowa homes need a house wash every one to two years. Our humid summers feed algae, and shaded or tree-lined lots get dirty even faster. The best times to schedule are spring, right after pollen season, or fall, before the first hard freeze. If your north side already looks green, don’t wait.

How often should you wash your house in Iowa?

Every one to two years is the right pace for most homes in the Des Moines metro. That schedule removes algae before it settles in and stains your siding. Some homes in full sun can stretch a little longer. Shaded homes near mature maples and oaks often need a wash every single year.

Here’s a simple rule. If you can see green film, black streaks, or a dull gray haze from the curb, it’s time. Algae you can spot from the street has been growing for months. The longer it sits, the harder it holds on.

Why does siding get dirty so fast in Iowa?

Algae is the main culprit. It’s a living organism that lands on your siding as spores, then feeds on moisture and shade. Iowa’s humid Julys give it everything it needs. That’s why so many homes around Des Moines turn green on the north side first. That wall gets the least sun, so it stays damp the longest. We wrote a full guide on why the north side of your house turns green if you want the details.

A few things speed up the buildup:

• Shade. North-facing walls and anything under big trees stay damp longer, and damp siding grows algae faster.
• Trees close to the house. They drop sap, pollen, and leaf debris that feed the grime.
• Sprinklers hitting the siding. If your irrigation sprays the wall every morning, you’re watering the algae too. Adjust the heads so they only hit grass.
• Tight lot lines. Homes built close together block sun and airflow between them, so those side walls stay green.

Should you pressure wash or soft wash your siding?

Soft wash. Siding should never get blasted with high pressure. A soft wash uses low pressure and a cleaning solution that kills algae at the root, so your siding stays clean longer and nothing gets forced behind the panels. High pressure on vinyl can crack it, strip paint, and push water where it shouldn’t go. We broke down the difference in our soft washing vs. pressure washing guide.

Save the real pressure for concrete. Driveways and sidewalks can take it. Your house wash should feel more like a heavy rain than a fire hose.

When’s the best time of year to wash your house?

Spring and fall are the two best windows in Iowa. In spring, wait until the pollen and cottonwood fluff settle down. Around here, cottonwood usually flies in June, and washing before it’s done means your clean siding catches a fresh coat of fuzz. Late spring through early summer works great.

Fall is the other smart window. Get the wash done after the maples and oaks drop their leaves in late October, but before the first hard freeze. A clean house heading into winter means freeze-thaw cycles aren’t working on months of trapped grime. We wash in a wide range of temps, so there’s more flexibility than most folks think.

How much does a house wash cost?

Most house washes in the Des Moines metro run $250 to $500. The price depends on the size of your home, how many stories it has, and how much buildup we’re removing. A single-story ranch in Urbandale sits at the low end. A big two-story in Waukee with heavy algae lands closer to the top. You can see all our numbers on the pricing page.

“The homes we wash every other year barely take any time. It’s the ones that waited five years that need the extra passes.” — the EverGlow Exteriors crew

What happens if you wait too long?

Algae doesn’t stop at ugly. Left alone for years, it can stain siding so deeply that a normal wash won’t bring back the original color. It also holds moisture against the wall, which is bad news for paint and trim. And if you’re ever selling, green siding is the first thing buyers see from the street. A regular wash is a lot cheaper than early siding repairs.

Common questions