Old houses, salt air, and two centuries of moisture
Mold, Water Damage & Painting in Portsmouth, NH
Portsmouth has some of the oldest housing stock in the country — Federal and colonial homes around the South End, converted condos downtown, and apartments above the Market Square storefronts. Coastal humidity and 200-year-old framing make moisture a year-round conversation here, not a seasonal one.
What we see in Portsmouth buildings
Most of Portsmouth's historic housing was built long before vapor barriers existed, and a lot of it still sits on fieldstone or rubble foundations that wick groundwater straight through. Add a coastal summer where dew points hold in the 60s for weeks and basements, crawlspaces, and knee walls stay damp long enough for mold to establish. Downtown condo conversions bring the opposite problem: modern insulation packed into an old envelope, trapping moisture inside walls that were designed to breathe. Both situations produce the same call — a musty smell nobody can source.
What we do in Portsmouth
Mold Remediation
Containment and removal in old basements, crawlspaces, and knee walls — with the water source found and fixed first, because cleaning mold above an active leak just buys a few months.
More about mold remediationWater Damage Recovery
Burst pipes and ice dams hit Portsmouth's older plumbing hard. We extract, dry to measured moisture content, and document the whole thing for your insurer.
More about water damage recoveryInterior Painting
Plaster walls, original trim, and settled framing need prep that most crews skip. We patch, prime, and cut in by hand — and can follow with air treatment so the space isn't full of dust and VOCs when you move back in.
More about interior paintingAir Quality Treatment
HEPA scrubbing and humidity control for damp basements and tight condo conversions, with before-and-after readings you can keep on file.
More about air quality treatmentPortsmouth homeowners and property managers ask us
Why does my Portsmouth basement smell musty every summer?
Coastal dew points sit high from June through September, and older fieldstone or rubble foundations wick groundwater continuously. Warm humid air hitting cool basement walls condenses, and that moisture is enough to support mold growth on joists, boxes, and stored contents even with no visible leak. The fix is usually moisture control — drying, humidity management, and sealing the source — not just cleaning what you can see.
Do you work on historic homes in the South End?
Yes. Older Portsmouth homes need a different approach than new construction — plaster instead of drywall, original trim worth preserving, and framing that has moved over two centuries. We prep and work around those realities rather than through them.
How fast can you get to Portsmouth?
We're based at 89 Elm Street in Epping, roughly 20 minutes out. For quotes and walkthroughs we can usually be on site within a few days, and we schedule painting and turnover work within about a week.
Got a moisture, mold, or painting question in Portsmouth?
We do free phone consultations. Tell us what you are seeing and we will tell you straight whether it needs a professional or not.