Drennen Custom Contracting

Drennen Custom Contracting is the leading certified radon mitigator in Northern Colorado. We specialize in real estate transactions and most radon systems can be installed in one day or less.

Drennen Custom Contracting also provides personalized roofing services including estimates, inspections and certifications. Our areas of expertise include hail and wind damage, leaks, full roof replacement or repair, and assistance in working with insurance companies.

We are constantly striving to use the highest standards and best industry practices in all areas of work we do.