Our Guarantee & Warranty - Mercer Roofing Co San Diego

The Mercer Roofing Co San Diego Guarantee

Since 2000, every roof we touch in San Diego gets covered by the same simple promise: if the work is not done right within 365 days, we make it right. No fine print, no prorated nonsense, no arguing about what the warranty actually covers. We write the guarantee down and hand it to you before we start. That’s what “we stand behind our work” means at Mercer Roofing Co San Diego, and it’s a promise Grant Whitlock has kept for homeowners from Point Loma to Rancho Bernardo.

Call (619) 810-5520

What’s Covered

• Workmanship for a full year. If any repair fails within 365 days, we come back and fix it free, including the second visit.
• Written guarantee on every repair. You’ll never chase a verbal promise, every repair includes a written guarantee as standard.
• Materials and parts handled correctly. We work with manufacturer-recognized shingle brands including GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral, installed to spec.
• Cleanup done right. We leave your yard, gutters, and walkways cleaner than we found them, nails included.
• Written price before work starts. Always included, never conditional, and the number on the invoice matches the number you approved.
• A technician you can verify at the door. Background-checked, uniformed, and photo-badged under the Threshold Standard, with name and photo sent to you before arrival.

Our Satisfaction Promise

If you’re not satisfied with a repair we’ve completed, call us. A live person answers, 24/7, not a voicemail, not a callback form. We’ll send a technician to inspect the work, and if the repair didn’t hold, the second visit is free. If something was missed or installed incorrectly, we correct it at no charge within the 365-day window. Grant’s rule is that no San Diego homeowner should ever have to fight for what they already paid for. You call, we show up, we make it right. That’s the entire process, and it’s been the process since Mercer Roofing Co San Diego was founded in 2000.

What the Guarantee Does Not Cover

Our guarantee covers workmanship and the integrity of our repairs and installations. It does not cover damage from new storms, falling branches, animals, foot traffic on the roof, or modifications made by others after we leave. If a Santa Ana wind event tears shingles off a section we did not touch, that’s a new repair, not a warranty claim. We’ll still come out and give you a written price before any work starts, and we’ll be honest about whether it falls under the guarantee.

Manufacturer Backing on Materials

We install shingles from GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. Each manufacturer offers its own material warranty, which is separate from Mercer’s workmanship guarantee. When we complete an installation, we provide you with the manufacturer warranty information for your specific shingle product. If a material defect appears, we help you navigate the manufacturer claim process, and we’ll handle the labor to replace defective materials when the manufacturer approves the claim.

Licensed & Insured Backing

A guarantee is only as good as the company that signs it. Mercer Roofing Co San Diego is licensed and insured, which means our promises are enforceable, not aspirational. Insurance protects your property while we work on it, and protects you from liability if something goes wrong. Licensing means the state has verified we meet baseline standards for roofing work. Combined with the Threshold Verified standard every technician meets, you’re dealing with a company that operates behind real credentials. Grant Whitlock has built Mercer Roofing Co San Diego on the principle that paperwork should back up performance, not replace it.

Why San Diego Homeowners Ask About Guarantees

Coastal salt air, intense UV exposure, and seasonal Santa Ana winds all take a toll on San Diego roofs. Homeowners in neighborhoods like Mission Hills, La Jolla, and Chula Vista have seen repairs fail because of improper flashing, skipped underlayment, or the wrong sealant. Our guarantee exists because we know the specific failure points in this climate. We install and repair with attention to decking, flashing, and underlayment, the trade words for the plywood or boards under your shingles, the metal pieces at roof joints, and the water-resistant layer beneath the shingles. Getting these three right is how roofs survive San Diego’s marine layer and dry heat, and covering them for 365 days is how we know we got them right.

How to Start With a Written Price

Every Mercer Roofing Co San Diego project begins the same way: a written price before any work starts, always included, never conditional. We walk the roof, document what we find, and give you the number on paper. You know the cost, the scope, and the guarantee terms before you sign anything. Call (619) 810-5520 to schedule your free estimate. A live person answers, day or night.

Written by Grant Whitlock, Owner at Mercer Roofing Co San Diego, serving San Diego homeowners since 2000.