Drennen Custom Contracting is a highly trusted local business in Northern Colorado, specializing in radon mitigation, roofing, and custom construction projects. With nearly 50 years of experience, the company has built a solid reputation for quality and reliability. Customers consistently praise their honesty, professionalism, and reasonable pricing. The business offers excellent service, from installing radon systems to addressing complex construction needs. Reviews highlight their promptness and ability to handle unusual circumstances with ease. Clients appreciate that their work complies with State and Federal regulations, ensuring safety and effectiveness. Many customers recommend Drennen Custom Contracting for any construction or mitigation needs, emphasizing their impressive performance and customer satisfaction. The company's friendly, warm, and understanding approach, as well as their commitment to resolving radon issues, have earned them a strong reputation in the community.
Seth thoroughly inspected all my crawl spaces and didn't hesitate to crawl through holes. I was very impressed. I felt like his radon mitigation plan will get the radon numbers as low as possible.
December 2025
Great crew and the install of the Radon Mitigation System was done with care and maintained the esthetic look of the finished basement and garage. I would highly recommend this friendly, honest and professional company.
December 2025
Extremely professional and knowledgeable about the installation of the mitigation system. Very personable and efficient. I highly recommend thia company!
