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.

Rated 4.8 (1200+ Reviews)

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.
Rated 4.8 (1200+ Reviews)

Nearly 30 Years of In-House Multi-Trade Mastery

No Guesswork. Just Irrefutable Proof.

Grandmark Home Improvements

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.

  • X-Ray Tech Technology
  • Video Proof on Every Job
  • Financing Experts

Unlock 0% Financing & X-Ray Precision for Your Project.

Protect Your Home and Budget with Pre-Approved Financing & Precision X-Ray Inspections.

100% Diagnostic Accuracy. Real Results from Local Homeowners

SERVICE AREAS

Proudly Serving the Central Valley & Beyond

Grandmark Brand

North Valley & Capital Region

  • Sacramento

  • Stockton

  • Modesto

Central Valley

  • Fresno

  • Clovis

  • Visalia

  • Merced

South Valley

  • Bakersfield

  • Tulare

 

Frequently Asked Questions

Why do you use X-Ray technology for inspections?

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.

Do I really need a full roof replacement?
Do you handle large commercial properties?
If you find a problem, can you fix it the same day?