Hunterdon County · 25 of 26 towns NJDEP Tier 1 Action level 4.0 pCi/L Free for homeowners — paid by the crews
Hunterdon RadonTesting & mitigation

Lambertville, City of Lambertville

Crawl space sub-membrane depressurization in Lambertville

Sealed membrane over an open crawl-space floor with suction drawn beneath it. The right system when there is no slab to cut through.

crawl space sub-membrane depressurization in Lambertville usually starts with a number somebody was not expecting.

How this normally comes up

  • A dirt-floored or stone-walled crawl space under an older farmhouse
  • A reading that stays high in a house with no slab to work through
  • A crawl space that smells of soil no matter the season

Why this comes up in Lambertville

The city is largely on a public supply, so a Lambertville job is normally an air-side job — which is not the case a mile inland in West Amwell. That is part of the context any crew working in Lambertville has to design around.

City of Lambertville — the state's own numbers

26% of the 1,422 test results NJDEP holds for City of Lambertville were at or above the 4.0 pCi/L action level — 368 of them. That puts it in Tier 1 — high potential.

A dense, largely 19th century city of row and semi-detached houses on narrow lots, with later building on the higher ground.

Practicalities in Lambertville

Narrow lots, shared and near-shared walls, and steep streets. Access is the defining constraint here.

Any permit for this runs through City of Lambertville. NJDEP radon certification has to be current before a business receives anything from us.

The usual approach

Where there is no slab, the ground itself becomes the barrier. Reinforced membrane is laid over the crawl-space floor, sealed to the walls and around the piers, and a suction point beneath it is piped to a fan. Sealing quality is the whole job here — a membrane taped at the seams and left loose at the wall performs nothing like one properly terminated.

Typical cost in Hunterdon County, NJ

$2,000 – $3,800 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.

Nobody can tell you what yours needs from a description alone, including us.

What we confirm before anyone calls you

This is certified work in New Jersey, not general home improvement. We look up the business on the NJDEP radon register, confirm the mitigation certification is active, and record the date. Insurance is not part of that check, and nothing here should be read as confirming that any business carries liability cover. None of that is an endorsement of their workmanship — get more than one quote.

Never tested, and wondering whether to?

Send us the reading and your town. We'll pass it to certified local crews and get out of the way. Free, and you're not committing to anything.

Get quotes in Lambertville →

Related

What tends to travel with this

Other work in Lambertville

Same ground, different question.

Crawl space sub-membrane depressurization nearby

Neighbouring towns on the same ground.