Google reviewers rate Mile High Radon Control five stars based on 159 reviews, with the owner responding to 84 percent of them. Customers frequently cite punctuality, clear communication, and fair pricing for radon mitigation services, including crawl space vapor barriers and system repairs. Many note that the team handles difficult installations professionally and offers honest advice, such as suggesting DIY fixes when appropriate. One lower-rated review criticized the visual appearance of an installation and alleged that the company was defensive when addressing the issue.
Data from Google, last updated October 26, 2026.
Reviews from Google, shown as published (original wording, unedited).
Darren and his team are excellent!! Darren provided prompt customer service and explained everything needed to mitigate our home. Jaden did a stellar job installing our system. Even when our home proved to be a very challenging install with hard cement-like dirt underneath our crawl space, he worked to do the job right. They went above and beyond. Highly recommend!
We were referred to Darren at Mile High Radon Control by our neighbors who had positive experiences with his work. On his first visit to our crawl space, he advised us we had to have the area cleaned out before he could do any work. He referred us to 1-800-Got-Junk who came and did a wonderful job. We notified Darren that the crawl space was now cleaned and ready for mitigation. It was a 2-step process. The first being Brandon Dominguez coming and installing the piping and fan system. After consultation with us he was able to install the system in a location of our preference. He is a great guy, extremely friendly and knowledgeable and worked very efficiently. He also made a small fence adjustment to help our gate close. He was a pleasure to have in our house. Two days later, Tyler came and installed the vapor barrier in the crawl space. Since he spent his time down there, we did not interact too much with him, but the little we he was very nice and also very knowledgeable of his tasks. I would highly recommend Darren, his company and his employees for any radon work you might need.
Hi Jim. Thank you for such positive and detailed review! We are very thankful.
I needed a radon system for a tricky crawlspace/basement. A lot of companies turned me down or gave me an inflated price to not have to deal with it. Darren at Mile Hi worked with me and got the job done! The price was great and so was the quality of the work! Great communication from him and his team. If I ever need another radon system, they will be my first and only call!
Thank you Mike! We really appreciate your kind words. I’m glad you had a great experience with us.
Incredible service, professionalism, and craftsmanship! I wasn't even home, since I had not made the move yet. They were in and out super quickly and these mitigations look absolutely textbook. Almost exactly like their photos on their website!
Thank you Cole! And thank you for trusting us from another state.
It has been awesome working with Darren. Fixed my radon problems at a fair price.
Thank you Denis! We are always grateful when customers take the time to leave us a review.
This should be the ONLY radon company you call! They have great communication, follow through on what they say, give proper advice, and just do an outstanding job overall! As a realtor, i interact with many different companies, & these guys are the ones i used on my personal residence for a reason.
Thank you so much David! It’s always a pleasure for us to be one of your vendors for your team.
Darren and Jimmy are the exact type of contractors you should support. Hired them for radon mitigation in my 1967 Longmont home.The clay under the slab is as hard as granite. Notice the clean cut into the slab in my photo. The obstacle didn’t scare them though, they immediately had solutions and were flexible. Locally owned and operated. I will only recommend Mile High Radon to my residential HVAC clients moving forward.
Cameron thank you for the kind words! We appreciate you taking the time to leave a review.
These guys are amazing, clean install and no cost follow up/replacement for a bad radon fan. Thank you, Darren!
Thank you Kyle! Sorry that fan went bad.
The team worked incredible hard and were fantastic. I have a small basement / crawl space and they did a fantastic job covering everything that was exposed and installing the system. They were super professional, timely, and kind. I do not envy their job! That is hard work. Would absolutely recommend them to anyone needing radon mitigations
Fast, affordable, and professional. They did a superb job!
Thank you so much Mike!