About Us

As a family-owned and operated company servicing Oakland County and the surrounding areas, Grennan Construction has earned a reputation for honesty and integrity. 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 – allowing us to offer the solution that is best suited for you.

A Message From Our Owner Fred:

Recent Projects


  • Mr. SokerBerkley, MI 48072

    I bought the roof inspection from Angie's List because of their reviews and reputation. They inspected the garage, the roof on my house and attic. They found that my roof was in pretty good shape except for the flashing around my chimney which was just tar. They gave me an estimate to fix the issue and came back within a week or two and fixed that. Very easy to work with.

  • Mr. BowlingHowell, MI

    "Very pleased with knowledge of craft and materials to be used. The crew was excellent. Would highly recommend.Very professional."

  • Mr. & Mrs. Rahja Waterford, MI

    "We have had our roof done & blown-in attic insulation & we are completely satisfied with both jobs. We are so happy to deal with an honest company & you will definitely be called back for any home improvements we make. It is our pleasure to know Fred. Thank you for such great work & please use us as a reference. We will totally recommend you. I can't say enough!"

  • Mr. ThomasOxford, MI

    "The whole crew worked their tails off to finish before the rain started. They worked until after dark, to wrap up the job."

  • Mr. RClarkston, MI

    "Prompt, professional and courteous service received. We were very impressed with our phone calls being returned the same day, plus the contractor showed up on time. That level of service is very difficult to find. I highly recommend Grennan Construction for your roofing needs."

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