Illustration for Washing a House Before You List It

Listing prep is a short window with a hard deadline. Here’s how to make a wash count.

Why the outside matters

Buyers often meet your house through photos first. The national real estate agents’ trade group ran a survey in 2025. In it, 88% of sellers’ agents said listing photos were much more or more important to their clients. Among buyers’ agents, 73% called listing photos highly important.

The same survey asked what agents most often tell sellers to fix. Decluttering came first at 91%. Cleaning the entire home came next at 88%, then improving curb appeal at 77%. A house wash sits right where “clean” and “curb appeal” overlap.

That survey doesn’t say a wash raises your sale price, and neither will we. What it shows is that agents treat a clean exterior as basic prep, not a luxury.

Book about a week before photos

Our rule of thumb is to book the wash about a week before the photo date. That gives you room for a rain-out and a second visit for missed spots. It also gives everything time to dry.

Photo day is where timing goes wrong. One real estate photographer’s prep list asks for all cleaning and staging to be done before the shoot, ideally the day before. It also says:

  • Don’t wet the driveway. Watering it leaves patches of dry spots and puddles in the pictures. A wet look can be added in editing if you want it.
  • Put hoses away the day before. Moving a hose drips water onto the pavement and leaves puddles.
  • Move the cars. Clear the driveway, and the street in front if you can.

A wash crew on site the morning of the shoot can undo the first two. Streaks or a wand pattern may show up on the driveway afterward. If so, see why driveways get stripes after pressure washing before you ask for a redo.

What to wash and what to skip

One listing photo company’s exterior checklist puts power washing the siding, walkways and windows right next to mowing and hiding trash cans. Here’s how the common jobs stack up when you’re listing soon. If you’re on the buying side, see what an inspection note about algae or mildew means.

Job Before listing photos? Why
Front siding and trim Yes The exterior photo is often the first thing buyers see (HomeJab checklist).
Driveway and front walk Yes, a few days early Must be fully dry by photo day; wet patches photograph badly (photographer prep list).
Windows and sills Yes Dirty windows detract from an otherwise polished exterior (HomeJab checklist).
Patio, deck, retaining walls If they’re in the photos Do them early enough to finish evenly.
Roof soft wash Only with a month or more Algae fades in 2 to 4 weeks; lichen can take 6 to 12 months (Soft Wash Technologies).
New concrete sealer Usually skip Label wants dry concrete, needs 72 hours for water repellency, may darken the surface (DryWay label).

A few of these deserve a closer look.

The roof. A soft wash kills algae, moss and lichen, but it doesn’t remove them on the spot. One equipment maker’s guide says black streaks weather off over about two to four weeks of sun and rain. Lichen can take a month or more to let go. A roof caught halfway through that process may look blotchy in photos. Our guide to roof soft wash results covers what that looks like.

Sealer. It’s a separate project with its own clock. One concrete sealer’s application sheet says the surface must be thoroughly clean and dry. Wait at least 24 hours after rain. Water repellency develops after 72 hours. It also warns the sealed surface may come out slightly darker. If you’re listing soon, a clean, dry driveway is enough.

Plants. The bleach used in soft washing can burn plants if it dries on them. The same equipment maker tells crews to soak every plant before starting and keep watering through the job. Brown shrubs by the front door are a bad trade for clean siding. Ask how the crew protects plants.

Chalky siding. Is your siding older vinyl or painted? Read what chalky vinyl reveals after a wash and how to even it out. Do the finger-rub test first.

DIY or hire it?

People ask this a lot before a sale. Last fall, a homeowner on a pressure washing forum wanted to clean a retaining wall before selling. Their worry was that a first-timer’s job would look half-done. That’s the real risk on a deadline: uneven results.

A pro also makes sense when the house is big or you’re not there. In Southern California, a window cleaner on a trade forum described a client with a three-story beach house. She wanted the driveway pressure washed and the house soft washed before she sold it.

If you live far away, your agent can often coordinate. On a real estate forum, an agent asked how others handle sellers who live far away. One reply said lining up and overseeing the work is part of the job.

Whoever you hire, get a written quote with the surfaces listed. Our house washing cost guide shows typical prices. Our questions to ask a house washing company covers what to check by phone. How we source our numbers: see our methodology.

Sources

Based on 9 sources · How we price