About Grandmark Service Company
Central California's Roofing & HVAC Experts
Serving homeowners and businesses across Central California with trusted roofing, HVAC and commercial building solutions.
NEARLY 30 YEARS OF INTEGRATED BUILDING SYSTEM EXPERIENCE
No Guesswork. Just Proven Solutions.
Grandmark Service Company was founded on a simple idea: building systems don’t operate independently, so contractors shouldn’t treat them that way.
Since 1995, our team has specialized in the intersection of roofing, HVAC, and energy systems. By understanding how these components work together, we can diagnose issues more accurately and provide solutions that prevent recurring problems.
Whether it’s identifying hidden roof leaks, diagnosing HVAC performance issues, or managing solar panel removal during roof replacements, our integrated approach allows us to solve problems other contractors often overlook.
Trusted by Homeowners Across California
Grandmark did an amazing job fixing our Roof and Duct work we needed done. Greatly appreciate them and recommend them 10/10 ! Thank you for everything making our home look great
This was our second time using Grandmark for a roof repair. They were able to fit us in very quickly to beat an upcoming rainstorm. Communication was excellent throughout the process, and the crew was courteous and left the work area spotless.
Romelo did a great inspection on my HVAC. He explained the findings to me from the pictures and video. Tune up price is reasonable.
Excellent service from financing to completion of the project. Angel and Antonio are efficient with a great work ethic. Antonio the project manager is communicative and you are given frequent updates until completion of job. Thank you so much I highly recommend Grandmark roofing.
Dave showed up on time. He was professional and quick to assess the roofs leak issues. Presented a fix for the roof and a plan to repair it. Followed through with the fix in a timely manner. Would recommend GrandMark for roofing issues.
Eric went above and beyond today he helped not just with my a/c system but brought me mail to and my Amazon Packages as well now that what I call service.
Dave just came by and gave us a five star estimate, professional and friendly, company estimate this guy Dave wonderful caring person actually cares about people and goes out his way to make sure families are safe. I really trust him with the family home and highly recommend this company .
SERVICE AREAS
Serving Roofing & HVAC Customers Across Central California
Grandmark Service Company provides roofing, HVAC, and commercial building services for homeowners and businesses throughout Central California. Our teams serve cities across the Central Valley and surrounding regions.
North Valley & Capital Region
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Sacramento
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Stockton
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Modesto
Central Valley
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Fresno
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Clovis
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Visalia
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Merced
South Valley
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Bakersfield
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Tulare
Frequently Asked Questions
Most contractors rely on visual inspections alone, which can miss hidden issues. Grandmark uses advanced diagnostic tools to identify problems such as hidden roof leaks, moisture intrusion, failing HVAC components, and insulation issues.
This helps our team recommend the right repair or replacement solution the first time and prevents unnecessary work.