Two brothers, the same pattern, one decision
Two brothers, both in the trades, kept seeing the same pattern: homeowners paying good money for roofing and HVAC work, only to face the same problems months later. Leaks that came back. AC systems that never ran right. Contractors who collected the check and disappeared.
The root cause was always the same. Nobody was treating the home as a system. A roofer fixed the roof. An HVAC tech replaced the unit. Nobody connected the two — and the homeowner paid the price every time, usually more than once, since a problem that gets patched instead of diagnosed just resurfaces somewhere else a few months later.
It wasn’t a rare occurrence. It was the pattern — job after job, customer after customer, the same story with different names attached. A leak that came back six months after a “repair.” An AC system that never quite ran right after a replacement, because nobody checked whether the ductwork underneath it was actually sealed. Two separate invoices, two separate companies, and neither one accountable for the gap between them.
We built Grandmark to be the contractor we wished existed. One that treats your roof, air, and comfort as one interconnected system — and stands behind every job with video proof. Most contractors profit from repeat callbacks, whether they mean to or not — a job that isn’t diagnosed properly the first time guarantees a second visit, and a second invoice. We built Grandmark to break that cycle, by treating the real cause instead of the symptom, and standing behind the work long after we leave. Twenty-five years and 1,200+ reviews later, that’s still the entire business model — not growth for its own sake, but the same two brothers’ worth of stubbornness about doing the job right the first time.
The same two brothers, still on the roof
This isn’t a franchise wearing a logo — it’s the same family that started the company, still showing up to jobs, still training every crew member to the same standard. When you call Grandmark, you’re not reaching a call center reading from a script.
What the standard actually means
Every decision — which trades we offer, how we train crews, how we handle a complaint — comes back to three values we’ve held since day one.
We quote what we find, not what we assume
Every recommendation is backed by a video inspection you watch before we start. If we can’t show you why, we don’t recommend it. No phone estimates, no guesswork dressed up as a quote — if a technician can’t point to what they found, on camera, the job doesn’t get quoted that way.
Proof, not promises
Anyone can say they do good work. We put it on camera. Pre-job inspection and post-job completion video on every job — a permanent record of exactly what was done, and why, that’s yours to keep whether you ever need it or not.
One system, one team
Roof, HVAC, and solar are physically connected. We’re the only contractor in Central California that coordinates all three under one team — so nothing gets missed between trades, and no penetration gets sealed by someone who doesn’t roof for a living.
Every job documented, first inspection to final seal
You watch it yourself — roof, ducts, penetrations, solar panels — all on camera, all yours to keep forever. If we can’t show you what we did and why, you don’t pay. That’s not a slogan; it’s the actual policy every technician works under, on every job, regardless of size. A $200 capacitor swap gets the same video documentation as a $20,000 commercial roof replacement, because the standard doesn’t scale down for smaller jobs.
If it comes back, we make it right. No charge.
If we fix it and the same problem comes back, we make it right at no charge. Not because we have to — because we want you to call us back when it’s time for a full replacement. We don’t patch symptoms, we fix causes. This applies to every residential and commercial repair across all 5 California markets — same policy whether it’s a $400 flashing repair or a full HVAC system install. This is why our jobs don’t come back.
What backs the standard up
Anyone can promise quality. These are the third-party standards we’re actually held to — organizations with their own reputations to protect, that don’t just take our word for it either.
GAF Master Elite
Top 3% of roofing contractors in the U.S. — stricter training, stronger warranties, real accountability to a national manufacturer standard. Fewer than 1 in 100 roofers ever qualify.
BOSCH Authorized
Factory-authorized HVAC installation and service, backed by manufacturer-certified technician training — not a self-issued badge, an actual manufacturer relationship.
BBB A+ & CSLB #1030917
Fully licensed and insured in California, Better Business Bureau accredited — verify either one directly, anytime, without taking our word for it.
What homeowners say about the standard
Our house is finally comfortable in the summer. They did the roof and the ducts at the same time — I didn’t even know that was possible. Best decision we’ve made as homeowners.
I’ve had contractors tell me what they did. Grandmark showed me on video. I watched every step of the job myself. That’s the only way I’ll ever hire a contractor again.
They not only did everything they said they would in the estimate, they went above and beyond — and came out on New Year’s Day to do the job.
Read the specifics behind each policy
Pre & Post Video Policy →
Exactly what gets recorded, how it’s delivered, and why it’s non-negotiable on every job.
No-Callback Guarantee →
What’s covered, for how long, and what happens if a problem does come back.
Licenses & Certifications →
Every credential we hold, and how to verify each one directly with the issuing body.
See the standard on your own home
Free video inspection. No pressure. You decide after you see exactly what we see — the same standard, whether it’s a small repair or a full replacement.