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Commercial Roofing in Walnut Creek, CA

Commercial roofing is the repair, replacement, and maintenance of flat or low-slope roofs on businesses, warehouses, and multi-unit buildings in Walnut Creek, CA — protecting your structure, inventory, and bottom line for 20–30 years. Whether it's a leak in a Downtown Walnut Creek office or end-of-life wear on a Rossmoor retail center, we assess the roof deck, stop water intrusion, and refit the membrane before small issues become a full tear-off.

Commercial roofs take a beating. Hot, dry summers with occasional hail events and strong afternoon winds age TPO, EPDM, and modified bitumen faster than most owners expect. Winter rain and storm systems are common, and when water seeps through a single lap or wicks along the decking, it erodes insulation and rots the substrate before you ever see a ceiling stain. We start with a full inspection — checking fasteners, flashing, and every seam — then recommend the right call: a targeted repair, a recover with a new membrane over the existing roof, or a complete tear-off and replacement. Cost depends on square footage, material, and how many layers we have to strip. A typical 5,000-square-foot TPO replacement runs $25,000–$45,000 installed, with a 20-year warranty. If you catch a leak early, a repair might run $1,500–$4,000 and buy you years. We don't push replacement when a patch will hold. We tell you what we see, what it will cost, and what we'd do if it were our building.

What's Included

  • Full roof inspection and written assessment with photos
  • Leak detection and repair of membrane, flashing, and seams
  • Recover or overlay with new TPO, EPDM, or modified bitumen
  • Complete tear-off and replacement, including deck repair
  • Re-sealing of all penetrations, drains, and HVAC curbs
  • 20-year workmanship warranty on all installations
  • Signs You Need Commercial Roofing

  • Water stains or drips on ceilings or interior walls after rain
  • Standing water on the roof surface for more than 48 hours
  • Blisters, bubbles, or cracks in the membrane you can see from the ground
  • Granule loss or bare spots on modified bitumen or built-up roofs
  • Visible rust or corrosion around roof penetrations, vents, or HVAC units
  • Our Commercial Roofing Process

  • We schedule a site visit at your convenience and inspect the roof, including seams, flashing, drains, and deck condition.
  • We measure every square and check local weather data to plan for dry, low-wind conditions.
  • We provide a written estimate with material options, timeline, and cost — no surprises.
  • Our crew preps the area, protects entrances and landscaping, and completes the repair or replacement using self-adhered membranes and ring-shank nails.
  • We do a final walkthrough with you, test for leaks, and hand over warranty paperwork.
  • Why Walnut Creek Chooses Walnut Creek Roofers

    Walnut Creek Roofers has serviced commercial roofs across Contra Costa County for over 15 years, with every job backed by a 20-year workmanship warranty.

    Trained Crews

    Our commercial roofing crews use ring-shank nails and self-adhered underlayment on every tear-off, and they're trained to spot rot, decay, and granule loss before it spreads.

    Written Warranties

    Every commercial roofing repair or replacement comes with a written warranty that spells out coverage in plain language—no fine-print surprises. We back our tear-off and overlay work for up to 10 years, and we're local enough to honor it.

    Local Since Day One

    We've worked roofs across Walnut Creek — from Rossmoor to Castle Rock — for years, so we know how hot, dry summers and winter storms hit your commercial roof. That local know-how means fewer callbacks and a roof that lasts.

    Explore Our Other Services

    Commercial Roofing Across Walnut Creek Metro

    We cover commercial roofing throughout Walnut Creek and the surrounding areas, including Downtown Walnut Creek, Rossmoor, Heather Farm, Castle Rock, and Green Valley.

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    Recent Commercial Roofing Projects in Walnut Creek

    Real work, real roofs — a sample of completed jobs

    Completed roofing project
    Roof replacement project
    New roof installation
    Roof repair completed