Radon mitigation · testing · system repair

Radon Mitigation in Asheville, NC

We help homeowners in Asheville, West Asheville, Weaverville, Arden, Fletcher, Candler, Black Mountain, and nearby Buncombe and Henderson County areas with radon mitigation systems, crawlspace radon mitigation, testing and retesting, and radon fan repair. Most people call after a home inspection or test kit comes back at or above 4.0 pCi/L — the EPA action level — or in the 2.0–3.9 range when a buyer or family wants the number lower.

You only need the number from your report to call. No diagnosis, no prep — we’ll walk through the rest on the phone.

Talk through your radon number Request a callback

Reading your result

What your radon number means

Every radon report comes down to one figure, measured in picocuries per liter of air. Here’s how to read yours — and what most Asheville homeowners do at each level. For the longer version, including why two tests of the same house can disagree, see Understanding Your Radon Test Result.

Under 2.0

Generally fine as-is

No mitigation needed at this level. Retest every couple of years, after major renovations, or after finishing a basement, since levels shift as a house changes.

2.0 – 3.9

Below the action level, worth a conversation

The EPA suggests considering a fix in this range, and buyers in real-estate deals often request one. Mitigation typically brings these homes well under 2.0.

4.0 +

At or above the EPA action level

Mitigation is recommended at this level. A standard system usually resolves it — most installs are a single day of work. Call to talk through your number →

What we do

Radon services for Asheville homes

Four services cover nearly every radon situation in Western North Carolina, from a first elevated test during a home purchase to a ten-year-old system whose fan has quietly stopped. Each links to a full page explaining the work, when it’s needed, and what affects scope.

Radon Mitigation System Installation

An active sub-slab depressurization system — suction point, sealed piping, and a quiet inline fan venting soil gas above the roofline.

BASEMENTSLAB

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Crawlspace Radon Mitigation

Sub-membrane depressurization for the vented crawlspaces under so many WNC homes — a sealed liner over the soil with suction beneath it.

CRAWLSPACECOMMON IN WNC

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Radon Testing & Retesting

Pre-purchase tests during due diligence, follow-up tests after mitigation, and periodic retests when a home or its use has changed.

PRE-PURCHASEPOST-MITIGATION

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Radon Fan Repair & System Checkups

Fans wear out after years of constant running. If the manometer on your pipe reads level — or the hum has stopped — the system isn’t working.

EXISTING SYSTEMS

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Local conditions

Why Asheville homes test high

Buncombe County sits in EPA Radon Zone 1 — the highest-potential category — and the reasons are built into the mountains and the houses themselves.

Uranium-bearing bedrock. The granite and gneiss under the Blue Ridge releases radon as it breaks down, and the gas rises through soil into whatever sits above it.
Vented crawlspaces everywhere. Older bungalows and mountain homes often sit over exposed soil — a direct path for soil gas into the living space.
Sloped lots and walk-out basements. Hillside construction means more foundation in contact with the ground, often in mixed basement-plus-crawlspace layouts that need a combined fix.
Winter stack effect. Heated air rising through a house pulls soil gas up from below — which is why winter tests often read higher than summer ones in the same home.

None of this means every Asheville home has a radon problem. It means the only way to know is a test — and that an elevated result here is normal, fixable, and not a reflection on the house.

Vented crawlspace under an older Asheville home with brick piers, a bare soil floor, and daylight visible at the foundation vents — The classic WNC crawlspace: bare soil, brick piers, vented to the outside — and open to soil gas.

The process

What happens after you call

No homework on your end. The whole point of the first call is that we do the sorting-out for you.

Tell us the number

From your inspection report or test kit. “Not tested yet” works too.

A few quick questions

Foundation type, rough square footage, whether there’s a sump or crawlspace. Plain language is fine.

Scope discussion

Most homes can be scoped from that conversation. Some layouts need a quick look first — we’ll say so if yours does.

Install, then retest

The system goes in, and a follow-up test confirms the new level so you’re not taking it on faith.

Close-up of a u-tube manometer mounted on a white PVC radon pipe in a basement, with the fluid offset showing the system under suction — The u-tube manometer: offset fluid means the system is pulling. Level fluid means call us.

Pricing

What affects the cost

Radon mitigation isn’t one fixed price, because Asheville homes aren’t one fixed shape. The main drivers: foundation type — and combinations, since basement-plus-crawlspace layouts are common on hillside lots — slab condition, how many suction points the soil requires, pipe routing on a sloped exterior, fan size, and the membrane area in a crawlspace.

None of that is homework for you. It’s what we sort out in the first call, usually in a few minutes. The cost page explains each factor so the conversation makes sense when you have it.

See the cost factors →

Where we work

Service areas

Based around Asheville, covering Buncombe County and nearby communities. Details on each area are on the service areas page.

Asheville West Asheville North Asheville Arden Fletcher Candler Weaverville Woodfin Black Mountain Fairview Swannanoa Leicester Mills River Hendersonville

Common questions

Radon mitigation FAQs

My test came back at 4.2 — do I really need mitigation?

4.2 pCi/L is just over the EPA action level, so yes — mitigation is the recommended fix, and a standard system typically brings a home like that well under 2.0. It’s also worth knowing that radon fluctuates day to day, so a 4.2 isn’t a borderline pass; it’s a snapshot of a level worth addressing. Call with the number and we’ll talk through what a system would involve for your foundation type.

Can I talk with someone if I haven’t tested yet?

Yes. If you suspect radon — a neighbor’s result, a past test, or you’re buying in a Zone 1 county — call anyway. We can talk through testing first, what it involves, and what mitigation would look like if the result comes back elevated, so there are no surprises in either step.

Does mitigation work in homes on crawlspaces?

It does, and it matters here because so many Western North Carolina homes sit on vented crawlspaces. The method is different from a basement system: a heavy sealed membrane goes over the crawlspace soil, and the system draws soil gas from beneath the liner before it can enter the house. Homes with both a basement and a crawlspace usually get a combined approach. The crawlspace mitigation page covers it in full.

Will the system be loud or ugly?

A properly sized radon fan runs at roughly the volume of a quiet bathroom fan, and it’s mounted outside or in unconditioned space — most owners stop noticing it within a week. The piping is routed to be as unobtrusive as the house allows, typically up an exterior side wall or through a garage or closet chase, and vented above the roofline.

Do I need to retest after the system is installed?

Yes — a post-mitigation test is the proof the system works, and it’s a standard part of the job rather than an upsell. After that, the u-tube manometer on the pipe gives you an at-a-glance check anytime: if the fluid is offset, the fan is pulling; if it’s level, call us.

I’m buying a house and the inspection found radon. How fast can this move?

Radon mitigation fits inside most due-diligence timelines. Because the first conversation usually covers what we need — the test number, foundation type, rough size — buyers, sellers, and agents can typically get a scoped mitigation plan quickly enough to negotiate with, and most installations are completed in a single day once scheduled. Call with the report number and your closing timeline and we’ll work within it.