comparisons

How to Choose a Radon Mitigation Contractor

· Updated April 13, 2026

Radon mitigation is a home improvement investment that affects your family’s long-term health. Choosing the right contractor makes the difference between a system that works for decades and one that underperforms or fails inspection. Here’s what to look for.

Start With Certification

The most important credential for a radon mitigation contractor is certification from a recognized national organization. Two programs dominate:

  • NRPP (National Radon Proficiency Program) — administered by the National Radon Safety Board (NRSB). Requires testing, continuing education, and proof of appropriate insurance.
  • NRSB (National Radon Safety Board) — also issues certifications directly; some professionals hold credentials from both programs.

Many states also have their own licensing requirements. In states with mandatory licensure, only hire contractors who hold the applicable state credential. You can verify certification status through the NRPP and NRSB online lookup tools.

Red flag: Any contractor who cannot provide a certification number or dismisses the importance of certification. Radon mitigation is not a specialty where experience alone substitutes for verified credentials.

Get Multiple Quotes

Prices for residential mitigation typically range from $800 to $2,500 depending on the foundation type, system complexity, and local market. Get at least two or three quotes before committing. Be cautious of quotes that are dramatically lower than others — they may reflect an inadequate system design or inexperienced installation.

A detailed written quote should include:

  • Foundation diagnostic inspection
  • Number of suction points proposed
  • Fan model and specifications
  • Pipe routing description (interior vs. exterior)
  • Post-mitigation testing (whether included or separate)
  • Warranty terms

Ask These Questions

Before hiring, ask prospective contractors:

  1. Are you certified through NRPP or NRSB? Get the certification number.
  2. Are you licensed in this state? Required in many states.
  3. How many suction points are you proposing and why? The answer should be based on a diagnostic pressure field extension test, not a guess.
  4. What fan model will you install? Reputable brands include Festa, RadonAway, and Fantech. The fan should be sized for your home.
  5. What warranty do you offer? One year on labor is common; some contractors offer longer.
  6. Will you include post-mitigation testing? Many contractors include a short-term test kit. If not, budget $20 to $30 for one.
  7. What does your liability insurance cover? Make sure they carry general liability insurance in case of property damage during installation.

Watch for These Red Flags

  • No written quote or contract — reputable contractors provide a written agreement before starting.
  • No post-installation test offered or recommended — any competent contractor should verify their system is working.
  • Fan installed inside the living space — radon fans should always exhaust to the exterior above the roofline. A fan in a basement or living area is a code violation and health hazard.
  • No diagnostic testing proposed — proper installation starts with a pressure field extension test to confirm sub-slab communication. Skipping this step is a sign of a shortcut mentality.
  • Guaranteeing levels below a specific number without inspection — no honest contractor can guarantee a final level without knowing your foundation’s characteristics.

Verify References and Reviews

Ask for two or three references from recent radon mitigation jobs, specifically homeowners with similar foundation types to yours. Check Google reviews and the Better Business Bureau. For real estate transactions, ask your real estate agent or inspector for contractor recommendations — they see the results of local contractors’ work regularly.

Understand the Warranty

A well-installed system can last 10 to 20 years or more. The fan is the component most likely to need eventual replacement — most radon fans carry a 5-year manufacturer warranty. Ask whether the contractor will service the system if the fan fails after the first year. Some contractors offer extended service agreements.

Find certified radon mitigation contractors in your area and request quotes to compare pricing and credentials.

Frequently Asked Questions

Is radon mitigation worth the cost?

If your home tests at or above 4 pCi/L, absolutely. Radon is the second leading cause of lung cancer after smoking, responsible for about 21,000 deaths per year in the US. A mitigation system ($800-$2,500) reduces radon levels by 80-99% and typically lasts the lifetime of the home with minimal maintenance (fan replacement every 5-10 years).

What radon level requires mitigation?

The EPA recommends mitigation for levels at or above 4 pCi/L and suggests considering it for levels between 2-4 pCi/L. The WHO recommends action at 2.7 pCi/L. There is no known safe level of radon exposure. Any home can have elevated radon regardless of age, construction type, or geographic location — testing is the only way to know.

Why does radon mitigation cost vary by city?

The biggest factors are local labor rates, foundation type, and home size. Homes with slab foundations are typically cheaper to mitigate than those with crawl spaces or basements. Local radon levels, soil permeability, and the number of suction points needed also affect pricing. Areas with higher radon risk often have more competitive pricing due to contractor density.

Find Radon Contractors Near You

Browse verified contractors in your area.

Browse Cities →