How Mercer Roofing Co Woodland Hills Was Born in Woodland Hills
We didn’t start as a brand experiment or a franchise play. Mercer Roofing opened its Woodland Hills branch because the homeowners here kept telling us the same story: they’d been through roofers who showed up late, left messes behind, or handed them a final bill that looked nothing like the estimate. The San Fernando Valley heat punishes roofs year-round, and by the time most people call someone, they’ve already been disappointed at least once.
Grant Whitlock remembers the job that made him say yes to leading this branch. A homeowner in Winnetka had a roof that three different companies had “fixed” over five years. Each one patched a section, collected a check, and left before the next rain found the next leak. When Grant walked the property, he found layers of mismatched materials, missing flashing, and a valley that had never been properly sealed. The homeowner wasn’t wrong to be skeptical. They’d paid for the same repair three times and still kept a bucket in the hallway every winter.
That’s the moment the decision became clear. Woodland Hills needed a roofer that cuts through the noise with one simple promise: the job gets priced in writing before any work starts, the person who shows up is the person you were told to expect, and the roof gets done right the first time. Not patched. Not papered over. Done once and done right.
We opened our Woodland Hills branch in 2000 as part of the Threshold Group family, and from day one we’ve operated with a single rule: every homeowner gets to know exactly who’s coming to their door before the crew arrives. That’s the standard Grant has held his team to for more than two decades, and it’s why people across the west Valley tell their neighbors to call us.
Grant Whitlock’s Personal Connection to the Roofing Trade
Grant Whitlock got into roofing the way most people find the work they’re meant to do: by accident, and then by obsession. He was nineteen the first time he climbed a ladder on a job site, not because he’d dreamed of roofing, but because a crew was short-handed and he needed the work. What he expected was a paycheck. What he found was something closer to a calling.
There’s a feeling you get standing on a roof at first light in the Valley, before the heat settles in. The air is cool, the world is quiet, and you can see clear to the Santa Monica Mountains from the right ridge in Woodland Hills. Grant talks about that feeling a lot. But what kept him in the trade wasn’t the view. It was the satisfaction of finishing something you can prove. A roof is the most honest structure on a house. If you did it right, the water stays out. If you didn’t, you find out fast. There’s no hiding in roofing.
Early on, Grant learned from the tradesmen already on the crews, watching how the best ones laid shingles square to the edge and flashed a chimney like they were sealing a boat. He learned that the smell of hot asphalt in the afternoon means the material is sealing properly, and that the sound a nail makes when it sets just right through a shingle is a small, sharp click, not a thud. Those details stuck with him. They became the way he judges every roof he walks today.
The craft matters to him personally, not just professionally. He’s the kind of person who, on a day off, will notice a neighbor’s missing ridge cap and mention it. Not to sell a job, but because he can’t not see it. If he weren’t a roofer, he’d probably be a woodworker or a mechanic, something where you fix a real problem with your hands and stand back and see that it’s right. The work itself is what gets him out of bed. That, and the knowledge that when a family in Woodland Hills opens the door to a Mercer roofing crew, they’re letting strangers onto the most important structure they own. He takes that seriously.
Meet Grant Whitlock – The Person Behind Every Job
Grant Whitlock is the Owner and Founder of Mercer Roofing Co Woodland Hills, leading the branch since 2000. He has built his career in the roofing trade across more than two decades of hands-on work in Southern California, from tear-offs and full replacements to leak forensics on homes built in the 1960s and 70s throughout the west Valley. He has worked on nearly every roof system common to this area, including composition shingle, tile, and low-slope builds.
What separates Grant from a technician at a corporate franchise is simple: he still walks the roofs. He’s the one on the ladder measuring slope, checking decking condition, and looking at how the existing flashing was originally installed before he ever puts a number in writing. There’s no dispatcher guessing from a satellite image. He’s seen too many roofs where nobody looked at the actual structure before quoting, and he won’t run a business that way.
Off the roof, Grant is a father and a lifelong student of how buildings work. He reads old construction manuals for fun, the kind with hand-drawn diagrams of valley flashing from the 1950s. He believes that if you understand why a technique was developed, you’ll never skip a step to save ten minutes. His personal commitment is this: every homeowner who calls Mercer Roofing in Woodland Hills gets his honest assessment, his written price, and his name on the work.
Our Promise to Woodland Hills Homeowners
We put the price in writing before any work starts. Not a rough range, not a verbal nod. A written, line-item price that says exactly what we’ll do and what it costs. If something changes, it goes in writing too. No surprise invoices, no “we found additional damage” after the tear-off is already in the dumpster.
We use quality materials, and we tell you what they are. GAF, Atlas, and Tamko shingles all have their place depending on the roof, the slope, and the homeowner’s budget. We explain the trade-offs in plain language and let you choose with your eyes open.
We stand behind the job under Threshold Verified. That’s the Threshold Group standard, and it isn’t a piece of paper. It’s the system that makes sure the person who arrives at your door is background-checked, identity-verified, and the exact person we told you to expect by name and photo before the visit. That promise is not a slogan to us. It’s how we operate, every single time.
Our Credentials
- State-licensed: Every pro working under the Mercer Roofing Co Woodland Hills name is required to hold the licensing their state requires for roofing work.
- Insured & bonded: The branch maintains the coverage required to protect homeowners and their property during a roofing project.
- Threshold Verified: Background check, identity verification, and photo-badge confirmation are completed for every technician before they ever stand at your door.
- Local leadership: Led by Grant Whitlock, who has worked in this market since 2000 and leads the branch day to day.
Why does this matter to you? Because when you hire a roofer, you’re trusting a team to work above your family, your furniture, and everything you own. Licenses mean the work meets state standards. Insurance means you’re protected if property damage happens. And Threshold Verified means you’ll never wonder who’s at the door. These aren’t extras. They’re the floor.
Rooted in Woodland Hills
Our service area covers the full west Valley: Woodland Hills, West Hills, Winnetka, Canoga Park, Tarzana, Encino, Van Nuys, and up through Calabasas, Agoura Hills, Topanga, and Simi Valley. We know which neighborhoods have original 1960s shake roofs hidden under composition shingles, and which hillside homes in Topanga need extra attention to access and underlayment. When a summer Santa Ana hits, we know which streets see the most blown-off ridge caps in Woodland Hills. That local knowledge doesn’t come from a database. It comes from being here, year after year, on the roofs themselves.
Written by Grant Whitlock, Owner at Mercer Roofing Co Woodland Hills, serving Woodland Hills since 2000.