Top-rated radon detection and reduction specialists.

Get matched with top radon detection and reduction specialists in California, MO

Q: How does radon enter my home?

• <div><p>Radon enters your home when warm air begins to rise and exits through the roof, creating a vacuum that pulls cooler air from under the foundation. Part of that air is radon, which is an invisible, odorless gas that develops naturally when radioactive particles are deep within the ground. Those particles usually come from decaying matter in soil and rocks.</p></div>

Q: What types of radon mitigation systems are available?

• <div><p>Options include sub-slab depressurization, crawlspace ventilation, and sealing cracks. Choose based on home construction and radon levels.</p></div>

Q: What if radon is still high after mitigation?

• <div><p>You'll need to test your home for radon after installing the mitigation system, then again every two years. If radon remains elevated, contact a licensed radon professional, either the contractor who installed the system or a different one, and have them evaluate the system. They may need to make some changes to improve its effectiveness and performance.</p></div>

Q: How much does it cost to replace a radon fan?

• <div><p>The cost to replace a radon fan ranges from $300 to $600 for the fan itself, with installation adding an additional $200 to $500. Overall, the total cost for replacement can range from $500 to $1,100, depending on factors such as the fan model, home size, and local labor rates. If the fan is part of a larger radon mitigation system, the price may be higher.</p></div>

Q: What are the benefits of radon mitigation?

• <div><p>Mitigation reduces radon levels, protecting your health and complying with safety standards.</p></div>

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Verified Reviews for Radon Detection And Reduction pros in California, MO

*The Angi rating for Radon Detection And Reduction companies in California, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.

*The HomeAdvisor rating for Radon Detection And Reduction companies in California, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.

Last update on April 27, 2026

Reviewed in April 2026
Ed was excellent to work with. He was very conscientious and respectful and his work is excellent. Ed put up drywall in 2 rooms and then painted everything to match. We are very pleased with the entire project and we enjoyed meeting Ed. The whole thing started as a surprise flood in my 87...
Frye Family Painting and Drywall Repair
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Reviewed in October 2025
Leroy and crew very professional and knowledgeable. Did a great job on my mobile home roof over. Took there time to make sure everything was lined up installed correctly before they mwould make it permanent. Would hire them again in a minute. Would recommend them to anybody.
Eagle Eye Construction
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Reviewed in October 2025
They did an excellent job. I had two trees near my house that they took down. One was very large and starting to split down the middle only ten feet away from the house.
Show Me Tree & Turf
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Reviewed in June 2024
The owner Daniel is very respectful came to my home gave me a great price and got my drive way and home power washed and looking brand new.
Supreme power washing L.L.C
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Reviewed in May 2024
Hayden is a great guy to work with. Very professional, timely, and trustworthy. Prompt service and hardworking. He can out when he said he would and gave me an estimate, Took a deposit and ordered the materials. Once they came in(took about 3 days) he scheduled when to come out with me. He...
Yoakum construction LLC
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Reviewed in April 2024
I hired them to clean my outbuilding and driveway in the same day and they were able to get both done and look great! For once you get the triangle of good, fast, and decent without having to pick two!
Pure Exterior LLC
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Reviewed in February 2024
Jordan and his assistant did a very good job at every step of the process. Were punctual and cleaned up well. Did all removal, installation and also did a very good job on the trim.
Reimer Renovations
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Reviewed in April 2023
He was prompt and he did outstanding work because he was very conscientious, he did inside rehab on my home and did outside work on my deck, he also put a patio in, pretty good quality.
Cutt's Construction Services
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Reviewed in April 2022
I called Gallegos Exteriors and they came out the same day to measure and give us a quote. We signed the contract on a Thursday. The next day the shingles were delivered and the work was done on Monday. They completely removed the old roof, checked for any damage (there was none) and put on the...
Missouri Metal Roofing, LLC
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Reviewed in February 2022
What they did for me was to raise and level my floors and install a floor joist where there had never been one. My home is 114 years old and has been neglected. After the initial work was done, I wasn't "happy" and had questions about how and why things were done, within 24 hours...
Foundation Recovery Systems
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Find Radon detection and reduction specialists in California

Full Scope Home Inspections

5.0(

)

Serving California, MO and surrounding areas

Approved

In business since 2014

Free estimates

Credit card accepted

"Randall went above and beyond what I thought would be done for a home inspection, was willing to crawl into small spaces. He did a very thorough job, and his report was very detailed, and that's why we appreciate his work."

Response time3 hrs

Response rate93%

Recommended by100%of homeowners

Serving California, MO and surrounding areas

In business since 2020

Free estimates

Credit card accepted

"Great value, very fair price."

Response time3 days

Recommended by100%of homeowners

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Braun's Inspection Consultants

4.7(

)

Serving California, MO and surrounding areas

In business since 2000

Free estimates

Emergency services offered

"James performed the inspection like a real professional."

Recommended by100%of homeowners

Serving California, MO and surrounding areas

In business since 2005

Free estimates

Mid MO Inspectors will provide you or your business with a full service approach to all your inspection needs. Please feel confident in contacting Mid MO Inspectors for your next inspection.

Recommended by100%of homeowners

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Brandsted Property Preservation

New to Angi

Serving California, MO and surrounding areas

In business since 2011

Free estimates

With over 10 years of experience in the home inspection industry, we are the experts you need to take care of your home. We will treat your home as we would treat our own. Give Brandsted Home Inspections a call today. We look forward to working with you.

Response time10 mins

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Radon Detection and Reduction questions, answered by experts

Radon enters your home when warm air begins to rise and exits through the roof, creating a vacuum that pulls cooler air from under the foundation. Part of that air is radon, which is an invisible, odorless gas that develops naturally when radioactive particles are deep within the ground. Those particles usually come from decaying matter in soil and rocks.

Options include sub-slab depressurization, crawlspace ventilation, and sealing cracks. Choose based on home construction and radon levels.

You'll need to test your home for radon after installing the mitigation system, then again every two years. If radon remains elevated, contact a licensed radon professional, either the contractor who installed the system or a different one, and have them evaluate the system. They may need to make some changes to improve its effectiveness and performance.

The cost to replace a radon fan ranges from $300 to $600 for the fan itself, with installation adding an additional $200 to $500. Overall, the total cost for replacement can range from $500 to $1,100, depending on factors such as the fan model, home size, and local labor rates. If the fan is part of a larger radon mitigation system, the price may be higher.

Mitigation reduces radon levels, protecting your health and complying with safety standards.

The California, MO homeowners’ guide to radon detection and reduction services

From average costs to expert advice, get all the answers you need to get your job done.

See all articles

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How Much Does a Radon Mitigation System Cost? [2026 Data]
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How Much Does Radon Testing Cost? [2026 Data]
Find out what impacts radon testing costs, including average prices for DIY kits and professional services, so you can protect your home and budget confidently.
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May 2, 2026May 2, 2026
How to Get Rid of Radon in Your Home
Radon can seep into your home through cracks and small openings. Here's how to get rid of radon and why you need to do it.
Audrey Bruno
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May 2, 2026May 2, 2026
Can a Homeowner Install a Radon Mitigation System?
Can a homeowner install a radon mitigation system? While some parts of the project are fine for DIY, you should leave the meat of the task to a licensed professional.
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•
Apr 10, 2026Apr 10, 2026
What Is Radon Testing?
What is radon testing? Radon testing measures the presence and concentration of radon gas within indoor environments. Read on to learn more.