About Company

Grennan Construction is a family-owned and operated roofing and siding contractor serving Oakland County and surrounding areas since 1998. Founded by Fred and Phil Grennan, the company has built a strong reputation for honesty, integrity, and exceptional customer service. Grennan Construction specializes in residential roofing, siding, window installation, gutters, masonry, and exterior remodeling, offering expert solutions tailored to each homeowner's needs. The company is recognized as a James Hardie Elite Preferred Contractor, one of only seven in Michigan, and is committed to using high-quality materials and providing durable, aesthetically pleasing results. Grennan Construction also offers affordable financing options and emphasizes transparent communication, expert craftsmanship, and customer satisfaction throughout every project.

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