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.
About Us
Specializing in the intersection of Roof, Solar, and AC since 1995
- X-Ray Precision: Pinpoint invisible damage.
- No Outsourcing: Only trusted, in-house experts.
- Total Solutions: Roof, HVAC, Solar-Integrated.
Nearly 30 Years of In-House Multi-Trade Mastery
No Guesswork. Just Irrefutable Proof.
In 1995, we decided to be different. We aren't a General Contractor juggling random sub-contractors. We are Interlinked Specialists. For over three decades, we have mastered the technical intersection where these systems meet. We realized that to provide a truly leak-proof roof, we had to be experts in the AC units that sit on them, the solar panels that anchor to them, and the wood rot that hides beneath them.
100% Diagnostic Accuracy. Real Results from Local Homeowners
SERVICE AREAS
Proudly Serving the Central Valley & Beyond
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 and guesswork, which often leads to unnecessary full replacements. Our X-Ray and thermal diagnostic tools allow us to see the invisible—like hidden moisture tracking under shingles or failing internal AC components—so we guarantee 100% repair accuracy and save you money.