Grennan Construction

About Us

Grennan Construction is a family-owned roofing and siding company serving homeowners throughout Oakland County, Michigan. Founded on honesty, hard work, and a commitment to doing things the right way, we’ve built our reputation as one of the area’s most trusted exterior remodeling contractors.



For over a decade, our team has helped families protect, update, and transform their homes through high-quality roofing, siding, window installation, and exterior renovation services. Whether you need a complete roof replacement, durable James Hardie siding, or expert guidance on improving your home’s curb appeal, we are here to deliver lasting results.