How Much Does House Washing Cost in NH? (2026 Pricing Guide)

Typical house washing prices in NH

For most single-family homes in the NH Seacoast and Southern NH, professional house washing runs between $250 and $550. The range is wide because home size, condition, and the specific surfaces involved vary a lot.

Here's a general breakdown by home size:

Home Size	Typical Price Range
Small (under 1,500 sq ft)	$200–$300
Medium (1,500–2,500 sq ft)	$300–$425
Large (2,500–3,500 sq ft)	$400–$550
Very large / multi-story	$500–$700+

These ranges are for soft washing the exterior siding, soffits, and fascia. Adding gutters, a deck, patio, or fence will increase the total — but bundling often saves on the per-service cost since we're already on-site.

What affects the price?

A few factors move the needle significantly:

• Square footage of siding — The biggest factor. A ranch with 1,200 sq ft of siding costs less than a two-story colonial with 2,800.
• How long since the last cleaning — A home that's been neglected for 5–10 years will have heavier organic buildup that takes more solution and dwell time to treat. First cleanings usually take longer.
• Presence of mold, algae, or oxidation — Heavy biological growth or oxidized vinyl requires additional treatment steps.
• Accessibility — Homes with steep grades, extensive landscaping, or sections that require ladder work take more time.
• Additional surfaces — Gutters, decks, patios, and fences added to the same visit are quoted separately but often at a reduced rate.

What's included in a professional house wash?

A proper house washing job should include more than just rinsing the siding. Here's what you should expect from a professional soft wash:

• Pre-rinse to wet down landscaping and protect plants
• Application of biodegradable soft wash solution to all exterior surfaces
• Treatment of soffits, fascia, window frames, and foundation
• Dwell time to allow the solution to kill mold, mildew, and algae
• Low-pressure rinse to remove solution and debris
• Final rinse of landscaping

Should I just rent a pressure washer?

It's a reasonable question. Pressure washer rentals run $60–$120 for the day. But there are a few things worth understanding before you go that route.

First, pressure washing is the wrong method for most siding. High-pressure water can crack vinyl, warp boards, and force water behind panels — which leads to mold inside your walls and rot in the sheathing. Most vinyl siding manufacturers specifically warn against pressure washing in their care guidelines.

Second, the cleaning solution matters as much as the equipment. Professional soft wash chemicals — specifically designed to kill algae, mold, and mildew — aren't available at the hardware store. Consumer-grade cleaning products simply aren't as effective, which is why DIY pressure washing often produces results that last a season, while a professional soft wash can last 2–3 years.

Third, working at height is one of the most common causes of serious home injury. Professional crews are set up for it safely. If you have a two-story home or hard-to-reach sections, the risk is real.

How often do NH homes need washing?

Most homes in the NH Seacoast and Southern NH benefit from a professional wash every 1–2 years. Homes that are heavily shaded, near trees, or in low-lying areas tend to accumulate mold and algae faster and may need annual cleaning. Homes on open, sunny lots can often go 2–3 years between full washes.

The Seacoast's humid summers are especially favorable to algae and mildew growth. If you notice dark streaks on your siding or soffits, the organic growth is already established and worth addressing before it spreads or causes staining.

What about bundling services?

If you're already having the house washed, it's worth thinking about adding gutter cleaning, driveway cleaning, or deck cleaning to the same visit. We're already on-site and set up, which means the additional cost per service is lower than scheduling each one separately. Most customers who bundle two or three services see a meaningful savings compared to individual visits.

Getting an accurate quote

The most reliable way to know what your specific home will cost is to get a free estimate. At Giani Exterior Services, we provide free on-site quotes — no obligation, no pressure. We look at the home, tell you exactly what's needed, and give you a flat price before any work begins.

Call us at (603) 416-1498 or submit a request online. We serve the NH Seacoast, Southern Maine, and the Lakes Region.