As an established Realtor in Northern Colorado since 1994, I am constantly dealing with radon issues that can make or break deals. When my personal home tested high on radon, I knew immediately that I would be asking Drennan to do the job. I've worked with out of town companies that other Realtors injected into a transaction and was always dubious that they know what they were doing. Drennan arrived at our home with a TEAM of professionals that genuinely understand the science surrounding radon as well as the way various construction methods interact with it. I couldn't be happier with the process (including scheduling, billing, competency, and courtesy) and will insist my clients allow only Drennan in their homes for evaluation & mitigation work.