How much does radon mitigation cost in Virginia?

The short answer

Most homes can be fixed for about what other common home repairs cost.^[5] When we checked in October 2026, the Virginia Department of Health's testing page (last updated October 22, 2026) said a typical sub-slab system may cost $800 to $1,200, while crawl spaces or homes with several sections that need mitigating may cost $2,000 or more.^[1] VDH's radon FAQ (last updated December 17, 2025) gives a wider range: a professionally installed system typically costs $800 to $2,500.^[2]

The cost depends on how your home was built and how big the radon problem is.^[1] Before you pay for anything, make sure the problem is real: a single short-term test is a screen, not a diagnosis. Our guide on how to test your home for radon explains the follow-up tests.

What you are paying for

The most common type of system, sub-slab depressurization, does not require major changes to your home.^[1] A contractor runs a suction pipe from under the slab to the outside and fits a fan that draws radon from below the house and releases it outdoors.^[5] The parts are simple. The price is mostly labor, the length and route of the pipe, and the diagnosis that decides how many suction points the house needs.

What pushes the price up or down

• Foundation type. A basement or slab on good gravel is usually the cheapest case. In a crawl space, the most effective method covers the earth floor with a high-density plastic sheet and uses a vent pipe and fan to draw radon from under it,^[5] which takes more material and labor. A house with a basement, a slab addition and a crawl space may need each part treated.
• How air moves under the slab. The number and location of suction pipes depends on how easily air moves in the crushed rock or soil under the slab and on the strength of the radon source; often only a single suction point is needed.^[5]
• Pipe route and fan location. The fan cannot go in or below a living area,^[5] and exhaust pipes must vent above the surface of the roof and 10 feet or more above the ground.^[5] Running the pipe up through a garage and attic costs more labor than a straight run up an outside wall, but it is less visible.
• Electrical work. The fan's electrical connections must meet local electrical codes.^[5] Virginia's radon mitigation contracting specialty does not cover that part of the job: "No electrical, plumbing, gas fitting, or HVAC functions are provided by this specialty."^[6] If the fan needs a new outlet or circuit, expect a licensed electrician on the quote.
• Diagnostics. Many contractors give free estimates but may charge for diagnostic tests^[5] that show how air moves under the floor. Those tests are sometimes necessary, especially when the contractor is unfamiliar with the type of house or expects a difficult job.^[5]
• Finish. Paint, pipe covers, an interior route or a quieter fan add cost.

Cheapest is not always best: the cheaper system may cost more to run and maintain.^[5]

Running costs after installation

Systems that use fans are more effective at reducing radon, but they slightly increase your electric bill, and most systems cause some loss of heated or cooled air.^[5] Plan for the fan, too. Fans may last for five years or more, manufacturer warranties tend not to exceed five years, and the cost of a replacement fan depends on labor and materials.^[5] Never switch the system off to save power; the fan must run continuously for the system to work.^[5]

New homes cost less to protect

If you are building, radon-resistant new construction (RRNC) is far cheaper than a retrofit. According to VDH's RRNC page (last updated November 3, 2023), an RRNC system usually adds less than $1,000 to the cost of the home.^[3] Installing a full system after construction usually costs more, and the piping and fan usually end up on an outside wall.^[3] If a new home with passive piping tests at 4.0 pCi/L or higher, a certified mitigator can convert it to an active system by adding a fan.^[3]

Radon in well water costs extra

Air mitigation does not treat radon in private well water. VDH's radon-in-water page (last updated September 5, 2025) says an activated charcoal filtration system, which generally costs less than $3,000, may be used for well water at 4,000 pCi/L or higher but under 10,000 pCi/L.^[4] The carbon bed should be changed every year, which may be a significant cost.^[4] Above 10,000 pCi/L, an aeration system should be used; these may cost $3,000 to $6,000 and need periodic maintenance and cleaning.^[4]

What to ask for in a written quote

Every quote should name the system type, the number of suction points, the pipe route, the fan model and where it goes, who does any electrical work, the post-installation test, and any promise to reach a set radon level and for how long. EPA suggests the contract include "The total cost of the job, including all taxes and permit fees; how much, if any, is required for a deposit; and when payment is due in full."^[5] Under Virginia law, licensed contractors must give you a written contract for residential work.^[7] Our guide to whether radon mitigation contractors need to be certified in Virginia covers the credentials to check.

Stop and call a pro if

• A long-term test, or the average of two short-term tests, is 4 pCi/L or higher.
• Your house has a crawl space, more than one foundation type, or a sump pit you are unsure about.
• The quote calls for new wiring: that part is for a licensed electrician.
• A private well test shows radon at or above 4,000 pCi/L.
• An existing system's gauge shows it has stopped working.

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