About Grennan Construction
Grennan Construction, a family-owned and operated Exterior Remodeling company specializing in roofing and siding, is based in Pontiac, MI. Our business model is a welcome change from the typical contracting company. We have built our business on our ability to take an unbiased, consultative approach to help homeowners understand the important details of making a successful construction investment. Educating homeowners on the entire process – from the initial inspection and estimate to the completed project.