Seacoast & Southern NH — Now Booking

Your property,
professionally
clean.

Connor and Gabe show up to every job themselves. No unfamiliar crews, no subcontractors. Fully insured, free quotes, and same-week availability across all of Seacoast NH.

(603) 686-7284

We respond within 1 hour

Get a Free Quote
5.0 ★★★★★ Google Reviews
Connor and Gabe, co-owners of Black Diamond Pressure Washing, Barrington NH

Fully Insured & Licensed

Connor & Gabe, co-owners in Barrington NH

Fully insured
Free estimates
Same-week availability
No subcontractors — ever
Eco-friendly solutions
5.0
Google Rating
Free
Estimates, Always
0
Subcontractors Used
2 Yrs
Serving Seacoast NH

Pressure washing in Seacoast NH

The right clean for every surface, every time.

New Hampshire homes take a beating every year. Between the humidity through summer, the algae and mold that builds up on siding and roofs, and the freeze-thaw cycles that grind grime into concrete driveways, most properties need professional cleaning every one to two years to stay in good shape.

Black Diamond Pressure Washing serves Portsmouth, Dover, Durham, Exeter, Hampton, Barrington, Rochester, and surrounding communities across Seacoast and Southern NH. We use the correct pressure setting and cleaning solution for every surface — soft wash for roofs and siding where high pressure would cause damage, and high-pressure equipment on concrete and asphalt where it belongs.

When you call Black Diamond, you talk to Connor or Gabe directly. They give you a straight price, show up when they say they will, and do not leave until you are happy with the result. That is how they built a 5-star reputation across Seacoast NH and it is how they operate every job.

5.0★
Average Google rating across every completed job
Same week
Availability on most jobs throughout the season
1 hour
Average response time when you call or fill out the form
Free
Estimates — no obligation, no pressure, no exceptions

Services

What we clean.

Every surface has a right way and a wrong way to clean it. We use the right one — and we never cut corners to finish faster.

House soft washing before and after New Hampshire House Washing

01

House & siding soft wash

Low-pressure cleaning that removes algae, mildew, and years of buildup without damaging siding, paint, or caulking. Safe for vinyl, wood, fiber cement, and brick.

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Soft wash roof and siding cleaning Seacoast NH Roof Cleaning

02

Roof soft wash

Eco-friendly solution applied at low pressure removes moss, algae, and black streaks caused by Gloeocapsa magma — without voiding your roof warranty or lifting shingles.

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Driveway and concrete pressure washing in Seacoast NH Driveway Cleaning

03

Driveway & concrete cleaning

High-pressure power washing that lifts oil stains, tire marks, and years of NH road grime from concrete and asphalt. Results visible from the street on the first pass.

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Deck and fence cleaning in Seacoast NH Deck, Fence & Windows

04

Deck, fence & window cleaning

Surface-specific methods that restore wood, vinyl, and metal without damage. Streak-free window finish guaranteed, and deck cleaning that preps the surface for staining.

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Real results

Drag to see the difference.

Every photo is a real property we cleaned in Seacoast NH. No stock images, no filters — just what professional pressure washing actually looks like.

Wood deck before pressure washing in Seacoast NH
Wood deck after pressure washing in Seacoast NH
Wood Deck RestorationBeforeAfter
Deck railing and exterior before soft washing
Deck railing and exterior after soft washing
Deck & Exterior Soft WashBeforeAfter
House siding before soft washing in NH
House siding after soft washing in NH
House Soft WashBeforeAfter
Propane tank and siding before pressure washing
Propane tank and siding after pressure washing
Commercial Pressure WashBeforeAfter

Drag the handle to compare

Gabe soft washing a home exterior in Seacoast NH
2
Years of BD Pressure Washing in Seacoast NH

Why Black Diamond

You get Connor & Gabe —
not a crew you've never met.

We started Black Diamond because we kept hearing the same complaint from homeowners across Seacoast NH. Companies send whoever is available that day. You never know who is showing up or how careful they'll be with your property.

With us, the co-owners show up to every job. Connor has called NH home since 2014, and Gabe grew up in Barrington with New England homes in his bones. That is not a sales line — it is just how we operate, and it is the standard we hold ourselves to on every job.

Right pressure for every surface

Soft wash for roofs and siding. High pressure only on concrete. We will never damage your property to finish faster.

Fully insured, no exceptions

Every job is covered. You never have to wonder what happens if something goes wrong because we handle it before we start.

Eco-friendly cleaning solutions

Safe for your landscaping, kids, pets, and the NH environment. We live here too and that is not a small thing to us.

Honest pricing, always

We give you a straight number before we start and we stick to it. No upsells on the day of the job, no surprise invoices.

How it works

Simple from the first call
to the final rinse.

01

Request a quote

Fill out the form at the bottom of this page or call us directly. We respond same day, usually within the hour — no call centers, no voicemail loops.

02

Get your estimate

Connor or Gabe will give you a straight number before we schedule anything. No upsells, no surprises, no vague ranges. Just an honest price.

03

We show up and clean

We arrive on time with professional equipment. You do not need to be home. We treat your property with care and clean up after ourselves.

04

You love the result

We do a quality check before we leave. If something is not right, we fix it on the spot. That is the Black Diamond guarantee on every job.

Start with a free quote

Same-day response  ·  No obligation  ·  Connor or Gabe picks up

Not happy with the result?
We come back and make it right.

No questions, no hassle, no extra charge. Connor and Gabe stand behind every job personally. That is the Black Diamond guarantee — and it applies to every single property we clean.

Get a Free Quote

Service areas

Serving Seacoast
& Southern NH.

Based in Barrington, we cover Portsmouth, Dover, Exeter, Durham, Hampton, Rochester, and every town in between. If you are not sure whether we reach your area, call us — we probably do.

Check your area
PortsmouthDoverDurhamExeterHamptonBarringtonRochesterStraffordNewmarketLeeNewingtonStrathamGreenlandRyeNorth HamptonRollinsfordSomersworthMadburyFarmingtonMiltonNew DurhamNorthwood

What customers say

Straight from Google.

5.0
★★★★★
5-star Google rating
★★★★★

"I found Black Diamond through a few friends and getting in contact with Connor and Gabe was extremely easy. You could see the pride and care they take in their work — down to the professionalism and time taken into their quote. The house has never looked as good as it does now and we couldn't be happier. I will definitely be referring all of our friends."

Zackary Ridlon

Google Review

★★★★★

"Gabe was the perfect person for the job. He got straight to the point and told me exactly what he was going to do and how much it would cost. 5 stars all the way."

Wyatt Gordon

Google Review

★★★★★

"Exceptional work! Very hard workers and don't stop until the job is done. I recommend to all!"

James Noble

Google Review

★★★★★

"Highly recommend their services, soft wash or pressure wash, they do it right."

Riley Smith

Google Review

Common questions

Everything you
want to know.

We get the same questions a lot — which is fair, because pressure washing covers a lot of ground. Here are honest answers to the ones we hear most. If yours is not here, just call us.

(603) 686-7284
Most New Hampshire homes benefit from professional pressure washing once a year. The combination of humidity, heavy pollen in spring, and algae growth through summer means buildup accumulates quickly — especially on north-facing walls and roofs that stay damp longer. If you notice green or black staining, that is algae and mildew and it is better to remove it before it damages the surface.
Pressure washing uses high-pressure water to clean hard surfaces like driveways, sidewalks, and brick. Soft washing uses a lower-pressure application of eco-friendly cleaning solutions to remove organic growth — algae, mold, mildew, and lichen — from delicate surfaces like roof shingles, painted siding, and wood. Using high pressure on a roof or siding can cause real damage. We use the right method for every surface on your property.
No. Soft washing uses very low water pressure — similar to a garden hose — combined with a cleaning solution. The ARMA (Asphalt Roofing Manufacturers Association) actually recommends low-pressure chemical cleaning, not high-pressure washing, for asphalt shingles. Our process is safe for all standard roofing materials and will not void manufacturer warranties.
Yes. We use eco-friendly, biodegradable cleaning solutions that are safe for your landscaping, lawn, pets, and family. Before we apply any solution near garden beds or plants, we pre-wet them and take precautions to protect them throughout the job. We live in New Hampshire too — taking care of the environment around your home is something we take seriously.
No, you do not need to be home. Most customers are at work when we show up and that is completely fine. We just need access to an outdoor water spigot and the areas to be cleaned. We will send you updates and photos when the job is done so you can see the results before you even get home.
Pricing depends on the size of your property, the services you need, and how much buildup there is. House washing typically starts around a few hundred dollars for a standard single-family home. Roof cleaning, driveway cleaning, and full property packages are priced based on square footage and condition. We give every customer a free, no-obligation quote before any work begins — no pressure, no vague estimates.

Get started today

Book your free
estimate today.

No obligation. Connor or Gabe respond within the hour — guaranteed.

(603) 686-7284

Request your free quote

No spam. No pressure. We will call or text within the hour.