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.
We respond within 1 hour
Fully Insured & Licensed
Connor & Gabe, co-owners in Barrington 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.
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 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.
Get a free quote
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.
Get a free quote
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.
Get a free quote
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.
Get a free quoteReal 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.
Drag the handle to compare
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.
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.
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.
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.
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.
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 QuoteService 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 areaWhat customers say
Straight from Google.
"I'd highly recommend Black Diamond Pressure Washing. Connor and Gabe were professional, efficient, and incredibly easy to work with. The clarity of their initial proposal and the final outcome were perfectly aligned. Zero gap between what was promised and what was delivered. What impressed me most was the level of care and attention they showed — it clearly felt personal to them. When they left, you wouldn't have known they were even there, other than how clean the houses looked."
Jesse Antosiewicz
Google Review
"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) 686-7284Get started today
Book your free
estimate today.
No obligation. Connor or Gabe respond within the hour — guaranteed.
(603) 686-7284Request your free quote
No spam. No pressure. We will call or text within the hour.