We feel strongly about supporting our community and causes near and dear to our hearts.
Habitat for Humanity
American Foundation for
American Brain Tumor Association
Volunteers Assisting the Disabled (VAD)
Waterford Christmas In Action
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Since 1988 we have been serving our community by providing the best roofing and siding services in Oakland County. Today, sign up to receive monthly updates, home maintenance advice, and special deals available only through our email newsletter.
Trust. Integrity. Professionalism. Quality.
As a family-owned and operated company servicing Oakland County and the surrounding areas, Grennan Construction has earned a reputation for honesty and integrity. Fair business practices, quality workmanship, and superior customer service are some of the key reasons we stand apart from other companies.
Founded in 1998 by Fred and Phil Grennan, Grennan Construction takes great pride in providing what many people feel is the best customer service in the business. We will take the time to get to know you and what you want and need in a home improvement project, which allows us to offer the solution that is best suited for you.
Employees of our licensed and insured company will treat you like family – providing a free estimate and delivering prompt, courteous, and honest service. We will take pride in protecting your property – treating it as if it was our own. We are professional, neat, and efficient. We will follow-up your project with a comprehensive customer satisfaction survey to ensure that we fulfilled every commitment and that you are 100% satisfied with the end result.
Schedule an appointment with one of our project consultants to evaluate your situation and answer any questions you may have. Our highly-trained staff will locate and repair the most difficult leaks, install a complete roof, and meet all of your siding, window, insulation, gutter, and drywall needs. We require no deposit (on most projects), and no payment is due until your project is completed and you are satisfied! We guarantee all materials and the quality of our work.
To be the premier construction company in our market, providing the highest quality and most cost-effective services, while earning the customer loyalty that ensures the longevity of our company through repeat and referral business.
To help home and business owners make educated decisions regarding their construction projects and to maximize the value of those projects by completing them with trust, integrity, professionalism, and quality, while delivering exceptional customer service.
GET TO KNOW
FRED GRENNAN, OWNER
Fred started in the construction industry in 1998 as a subcontractor. Unlike most subcontractors, however, Fred wasn’t just a guy with tools and a truck. His tremendous work ethic and dedication to providing top-notch quality and customer service set him apart. Fred quickly earned the high praises of homeowners, his crew, and other industry professionals. These praises, and the steadfast guidance of his father, Phil, convinced Fred he was ready to take the leap from subcontractor to contractor.
With over 17 years of experience, Fred Grennan has redefined what it means to be a contractor in the construction industry. The owner and operator of Grennan Construction has built his business by building relationships. Be it a customer, employee, or product representative, Fred takes the time to get to know everyone. He strives to find the best possible solution for all parties involved, so win-win situations are always Fred’s goal. Customers often comment on Fred’s trustworthiness, professionalism, and his natural ability to treat everyone like family.
Employees of our licensed and insured company will treat you like family – providing a free estimate and delivering prompt, courteous, and honest service.
Field Technician Supervisor
Assistant Project Manager