Our team services Oakland County and the surrounding areas, providing residential roofing, and siding services.

As exterior remodeling experts, we install high quality, long-lasting roofs. Grennan Construction is the leading residential roofing contractor in Oakland County, Michigan, serving the community for over 20 years. We are home to a team of dedicated, professional, roofing installers, that strive for excellence and providing our customers with the best service possible.

photo of a home with a newly installed roof and James Hardie siding #2

West Bloomfield, Michigan

Exterior Remodel

  • Roofing
  • Front Porch Addition
  • James Hardie CedarMill lap siding: Aged Pewter
  • James Hardie NT3 Rough Sawn Trim: White
  • Stone
  • Windows
Grey bungalow in West Bloomfield, Michigan prior to exterior remodel.

Angi super service award for badge 2021.
James Hardie Elite Preferred Contractor Alliance logo.
CertainTeed Select ShingleMaster vector logo
Grennan Construction BBB Business Review
Detroit Best of the Best award for roofing, siding, and windows.



Oxford, Michigan

Exterior Remodel

  • Siding: CertainTeed Monogram- Charcoal Grey PVC wood grain
  • Aluminum trim: White 5”
  • Seamless gutters: White
  • CertainTeed Landmark shingles: Moire Black
Before photo of white house with maroon shutters in Oxford, Michigan.

Exterior Remodel with new roofing, siding, and gutters. Oxford, Michigan.
After photo of a home in Clarkston, Michigan, Grennan Construction completed a Roof replacement using CertainTeed Landmark shingles in the color pewter.

Clarkston, Michigan

Roof Replacement

  • CertainTeed Roof replacement using Landmark shingles in the color pewter
After photo of home in Clarkston, Michigan that Grennan Construction completed a Roof replacement using CertainTeed Landmark shingles in the color pewter.

Highland, Michigan

Exterior Remodel

  • CertainTeed Landmark Pro shingles in the color driftwood MaxDef
  • Anderson 100 series windows – black exterior – white interior
  • Monogram Siding in the color castle stone accented by sterling grey gutters.
Home in Highland, Michigan that Grennan Construction installed new CertainTeed Monogram Siding in the color castle stone accented by sterling grey gutters. CertainTeed Landmark Pro shingles in the color driftwood MaxDef. Anderson 100 series windows – black exterior – white interior

Home in Highland, Michigan that Grennan Construction installed new CertainTeed Monogram Siding in the color castle stone accented by sterling grey gutters. CertainTeed Landmark Pro shingles in the color driftwood MaxDef. Anderson 100 series windows – black exterior – white interior

Roofing Gallery

After roof replacement

Before roof replacement

After roof replacement

After new roofing, siding, and gutters

Before new roofing, siding and gutters

After new gutters

After new addition, roofing, James Hardie siding, windows, and gutters

Before new addition, roofing, James Hardie siding, windows, and gutters

After new gutters


When a roof can account for as much as 40% of the average home’s exterior, many factors weigh into the choice of materials. Some surfaces are more beautiful than others. Some offer greater resilience or endurance. Some are more affordable. But the one roofing surface which offers all those attributes in balance is the asphalt shingle.

Now accounting for about 80% of the residential roof surfacing in the United States, asphalt shingles are measured against a variety of standards that evaluate fire and wind resistance, tear strength, and other key performance indicators.

Asphalt shingles have a glass fiber reinforcing mat manufactured to the shape of the shingle. This mat is then coated with asphalt which contains mineral fillers. The glass fiber mat is not waterproof by itself. Its purpose is for reinforcement. What makes the glass fiber shingle waterproof is the asphalt. However, the asphalt itself will not stick to the mat. For this reason, “fillers” are used. The fillers in the asphalt cling to the glass fibers in the mat. The asphalt then encapsulates the glass fibers, fills all of the little holes and voids in the mat rendering it waterproof. After this cools a bit, adhesive asphalt is used to cover the mat and the ceramic granules are then embedded.

CertainTeed Select ShingleMaster vector logo

Grennan Construction, Oakland Counties leading residential roofing contractor, is proud to install shingles from only the highest-quality manufacturers – such as CertainTeed, GAF and Owens Corning. When your roof is on the line – only the best will do.

With 100's of roofing options to choose from, and quality standards that lead the residential roofing industry, you can rest easily knowing Grennan Construction has you covered.

Example of Grennan Constructions Bronze level roof shingles. Residential roofing company Michigan
Example of Grennan Constructions Silver level roof shingles. Residentail roofing company Michigan.
Example of Grennan Constructions Gold level roof shingles. Residential roofing company Michigan.


The ceramic granules are there for two reasons. The primary reason is to protect the shingles from the sun. The sun’s UV rays are very damaging to asphalt and cause it to deteriorate prematurely. This is one of the reasons that gravel is used on built-up roofs. The second and more obvious reason for the granules is aesthetics. Asphalt shingles are available in a wide variety of colors to match almost any facade or landscape.


Illustration of Phil Grennan holding silver and bronze medals and a gold trophy.


Most people think replacing their roof is simply replacing shingles. However, we want our customers to know better!

Today, effective roofing relies on advanced material technology and an integrated systems approach to protect your biggest asset – your home.

Leak Barrier

Protect your home from wind-driven rain and damaging ice dams with a waterproof leak barrier. A quality leak barrier will help:

  • Create a 100% watertight seal that keeps water out at the most vulnerable areas of your roof (at the eaves and rakes, in valleys, around chimneys, etc.)
  • Protect your home by preventing costly repairs due to wall or ceiling staining
  • Prevent leaks due to water damming in your gutters, wind-driven rain and, here in Michigan, damaging ice dams

Roof Deck Protection

Avoid a buckled, bumpy-looking roof and reduce shingle blow-off with quality roof deck protection. Superior quality roof deck protection can protect and beautify at the same time! Quality roof deck protection:

  • Prevents wind-driven rain (or water from other sources) from infiltrating under your shingles and causing damage to your roof structure or the inside of your home
  • Provides an extra layer of protection between your shingles and your roof deck
  • Lays flatter and will not buckle when installed
  • Helps reduce shingle blow-off by allowing your shingles to lay flatter and more uniformly
Residential roofing contractor

Attic Ventilation

Proper attic ventilation is crucial to a long-lasting roof system. Poor attic ventilation can ruin your insulation, destroy your shingles, and raise your energy bills!

Why Take Risks?

It is estimated that 9 out of 10 homes in North America do not have proper attic ventilation. Why? Because most people are unaware that attic ventilation can impact the longevity of their entire home! In the summer, an improperly ventilated attic can cause heat to build in excess of 160°F. This superheated air eventually penetrates the ceiling insulation into the living area below.

Types of damage that can result include:

  • Premature aging of your roofing system (“fried” shingles)
  • Warping, cracking, or breaking down of wood framing
  • Damage to siding, exterior or interior paint, and wallpaper
  • Higher energy costs

A properly ventilated attic can help reduce the load on your air conditioner by moving the superheated air out of your attic before it builds up and causes damage. In the winter, various household appliances, bathtubs, showers, and cooking vapors can contribute to excess moisture build-up. Improperly ventilated attics will allow this moisture to collect and cling to the underside of the roof. There, it will condense and fall, soaking the attic insulation and reducing its efficiency.

Additional structural damage can include:

  • Roof deck warping and rotting of the wood frame
  • Mildew growth
  • Buckling of shingles and felt

Attics should be properly ventilated to help prevent ice dams in cold northern climates. During the winter, ice and snow on a roof will melt and run down the deck to the cooler eaves. This run-off can re-freeze, creating an ice dam that will trap moisture on the roof. The moisture can eventually back up under the shingles and enter your home – causing hundreds or thousands of dollars of damage to your ceilings and walls. Adequate attic ventilation will reduce the amount of initial melting that occurs on your roof, thereby reducing the chance that ice dams will form.

Proper Attic VentilationProper attic ventilation systems allow a continuous flow of outside air through the attic, protecting the efficiency of the insulation and helping to lower temperatures in the living space. It consists of a balance between air intake (at your eaves or soffits) and air exhaust (at or near your roof ridge).

The FHA (Federal Housing Administration) recommends a minimum of at least 1 square foot of attic ventilation (both intake and exhaust) for every 300 square feet of attic space. For example, if your attic is 900 square feet, you need a total of 3 square feet of ventilation. This amount is generally divided equally between intake and exhaust ventilation (i.e., 1 1/2 feet of each), to insure proper air flow through the attic.

Today, effective roofing relies on advanced material technology and an integrated systems approach to protect your biggest asset – your home.

Roof Cap Shingles

The perfect finishing touch for your new roof should be a distinctive ridge cap shingle. A distinctive roof cap shingle will:

  • Accentuate the natural beauty of your newly installed architectural shingle roof (or even add dimension and depth to a strip shingle roof)
  • Provide a striking and higher quality alternative to using cut-up strip shingles as your ridge cap


Protect your home from fire and damage with a quality membrane system. A quality membrane roofing system will provide long-lasting protection for the low-slope areas of your home (e.g., porches, garages, car ports, sun rooms, etc.) without the danger or hassles associated with conventional roofing products.


Let the sun shine in with a quality skylight! Skylights are the perfect way to add natural light to family rooms, kitchens, bathrooms, or any room that would benefit from the architectural style and luxury of a skylight.

To read more about what roofing services and products we offer follow the link below .

To learn more about our no foolin' roof system and warranty follow the link below.

Can You Install a New Roof in the Winter?

Read our blog about installing your new roofing system in the winter months.



"Did a great job helping devise solutions for problems with a 98-year-old historic home. Carpentry & paint skills excellent! Good communicators. Always knew what to expect."


"I had a masonry job on my late 1920s home and Grennan Construction did an absolutely outstanding job. I would definitely use them again in the future!"


"I've used Grennan Construction for repairs and upgrades to my home and business. Fred and his crew have always done a great job at a reasonable price."

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We proudly serve Auburn Hills, Berkley, Birmingham, Bloomfield Hills, Clawson, Clarkston, Commerce, Davisburg, Farmington Hills, Ferndale, Franklin, Hazel Park, Highland, Holly, Huntington Woods, Lakeville, Leonard, Keego Harbor, Lake Angelus, Metro Detroit, Milford, Madison Heights, New Hudson, Novi, Oak Park, Oakland, Oakland County, Orchard Lake Village, Pleasant Ridge, Pontiac, Rochester, Rochester Hills, Southeast Michigan, Sylvan Lake, South Lyon, Southfield, Union Lake, Walled Lake, Troy, Villages of Franklin, Lake Orion, Ortonville, Oxford, Waterford, White Lake, West Bloomfield, & Wixom.

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