Grennan Construction

Grennan Construction Grennan Construction, a family-owned and operated Exterior Remodeling company specializing in roofing and siding, is based in Pontiac, MI.

Our business model is a welcome change from the typical contracting company. We have built our business on our ability to take an unbiased, consultative approach to help homeowners understand the important details of making a successful construction investment. Educating homeowners on the entire process – from the initial inspection and estimate to the completed project checklist and walk-through

– provides peace of mind of a project done the right way. Our Mission: To help home and business owners make educated decisions regarding their construction projects and maximize the value of those projects by completing them with trust, integrity, professionalism, and quality while delivering exceptional customer service.

Finished up another James Hardie siding project in Rochester Hills. Really like how the new siding works with the existi...
09/02/2026

Finished up another James Hardie siding project in Rochester Hills. Really like how the new siding works with the existing brick and white trim. Clean look and a big improvement to the exterior.

If you’re thinking about new siding, give Grennan Construction a call. We’d be happy to come out and take a look.

248-462-0224
GrennanConstruction.com

What a transformation!We gave this home a completely new look using James Hardie® Architectural Panels paired with Tamly...
07/31/2026

What a transformation!

We gave this home a completely new look using James Hardie® Architectural Panels paired with Tamlyn trim for a clean, modern exterior.

The combination of large-format fiber cement panels and detailed trim completely changed the character of this home while providing the durability and low-maintenance performance James Hardie is known for.

If you’re thinking about updating your home’s exterior, siding can do a lot more than just replace what’s there. The right design, materials and installation can completely transform your home.

Grennan Construction
Serving Oakland County and Southeast Michigan since 1998.

05/25/2026
Something is VERY wrong in this photo…We saw this on a home right here in Oakland County, Michigan and had to stop and l...
04/08/2026

Something is VERY wrong in this photo…

We saw this on a home right here in Oakland County, Michigan and had to stop and look twice.

👉 Can YOU spot what’s wrong?

Drop your guess below
(No editing your answer after you see someone else’s 😂)

💥 BONUS:
We’ll pick ONE random person in the comments to win a $25 Amazon gift card

⚠️ Hint: This is something that could cause serious problems for the homeowner

We’ll reveal the answer later tonight 👀

If you own a home in Pontiac, Bloomfield, Rochester, Troy, or surrounding areas, this is exactly why proper installation matters.

If you ever want a FREE roof & skylight inspection, we’ve got you covered.

🌐 www.GrennanConstruction.com

Let’s make today a GREAT day!

248-462-0224

Address

917 Orchard Lake Road
Pontiac, MI
48341

Website

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