Grennan Construction

Family-owned since 1998, Grennan Construction provides exterior remodeling from Pontiac for homeowners throughout Oakland County and nearby communities. Window replacement and installation sit alongside its main roofing and siding services. The company installs James Hardie fiber cement siding and vinyl siding, replaces roofs, and provides gutter systems. Additional work includes storm, hail, and wind damage restoration, plus masonry and brickwork repairs. Its approach gives homeowners guidance from the initial inspection and estimate through the final project walkthrough, helping them compare options before work begins. Free estimates are available, and financing includes zero-interest options. The service area names communities such as Auburn Hills, Birmingham, Clarkston, Commerce, Lake Orion, and Bloomfield Hills. Its Pontiac address is 917 Orchard Lake Road. Rated 4.8 from 253 Google reviews, including 227 five-star reviews.