Local contractor providing radon testing and mitigation along with roofing services. Office is located on E Trilby Rd in Fort Collins with weekday hours.
Homeowners frequently note clear communication, punctual crews, and tidy job sites. Projects are often completed in a single visit when feasible, with guidance on testing before and after mitigation. The team explains options and addresses questions without pressure.
Fort Collins and surrounding Northern Colorado neighborhoods.
Services include: radon testing, passive-to-active mitigation upgrades, full radon mitigation systems, post-install test support, and roofing inspections, repairs, and replacements.
Reviews consistently highlight courteous, on-time crews who explain the process and answer questions thoroughly. Many customers mention efficient installations—often completed in one day—and careful cleanup. Follow-up testing guidance and noticeable reductions in radon levels are recurring themes. Overall satisfaction reflects clear communication from estimate through completion.
Drennen Radon Mitigation team was very professional from the estimate to the challenges of installation. I highly recommend the service. Seth lead the team and made sure all of our concerns were handled to our liking. Ray and Garrett, took care of the electrical and concrete boring and did a fine job. We were very impressed with the whole process all finished in one day. Thank you Drennen!
I hired Drennen to update my passive radon mitigation to an active mitigation with a fan. Both the initial inspector and the technicians were incredibly patient with my questions and explained everything very well. The installation went very quickly and smoothly and the left we with a mitigation test to assess the efficacy of the new system. It was way easier than I expected, though definitely an investment.
Less than 24 hours after Drennen finished updating my radon system, and I couldn’t be happier. It was a true pleasure working with their team. They were on time, courteous, informative, and delivered high-quality work. Everything looks great and is working perfectly.I feel confident that when we complete the post-installation test, we’ll see a noticeable improvement in radon levels, and I can move forward with real peace of mind. Highly recommend!
Drennen installed my radon mitigation system when we purchased our new construction home. I recently contacted them about checking our current level to make sure everything is working as it should. It was easy to get a convenient appointment time, the employees are all very friendly and helpful. I was given options for picking up a test kit or having one of their employees drop it off and set it up. It was great to learn that during radon awareness month they were offering a discount for both options. There were some changes with the appointment drop off/pick up time and Drennen did a great job of communicating throughout. Very pleased with their service.
Fantastic job of radon mitigation installation. The install crew was awesome, fast, and cleaned up afterwards. I couldn't imagine a better installation. After 24 hours my radon levels are below the guideline and I am very happy. Drennen made this whole process a breeze.
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