San Mateo County, California

Hollow Metal Doors & Frames in San Mateo County, CA

Commercial buildings, schools, healthcare, industrial, and multifamily properties in San Mateo County call Guardian Door LLC for hollow metal door and frame installation, including fire-rated openings and full hardware sets. Send the address and the symptoms and we’ll confirm availability.

Get a Quote in San Mateo County (833) 424-3667
  • Licensed & insured
  • Fast response
  • 5.0 on Google

  • California CSLB #1025448

    Verify on the CSLB site

  • Fully insured

    Certificate of insurance on request

  • Commercial & industrial only

    No residential garage doors

  • Based in Sacramento

    Northern California service area

Your Hollow Metal Doors Team in San Mateo County

Guardian Door LLC provides hollow metal door and frame installation, including fire-rated openings and full hardware sets for the listed cities in San Mateo County. San Mateo County coverage includes 11 communities. The closest to our Sacramento base is Daly City; the farthest is Half Moon Bay, about 92 miles out. The complete breakdown is in our hollow metal doors guide.

  • Hinges, closers, exit devices, and locksets
  • Welded and knock-down hollow metal frames
  • Door-only replacement in sound existing frames
  • Security and exterior steel doors
  • Gasketing, coordinators, and thresholds
  • Fire-rated door and frame assemblies

Hollow metal openings we inspect in San Mateo County

  • We start by checking the frame: whether it is plumb and sound, whether its label matches the rating the opening needs, and whether the hardware preps line up.
  • That tells us if the existing frame can stay or needs replacement.
  • Stock sizes and common ratings can arrive quickly; custom sizes, welded frames, and special finishes take longer.
  • Lead time is part of the quote.

Doors, frames, and hardware we install

  • Hollow metal doors, welded and knock-down frames, and the hardware that goes with them — hinges, closers, exit devices, locksets, coordinators, and gasketing — installed to template.
  • On a rated opening the hardware is part of what makes the assembly compliant, so we specify and install it as a set.

Fire-rated openings and local requirements

  • Requirements for a hollow metal opening depend on the specific opening — its fire rating, egress role, accessibility function, and the occupancy of the building.
  • They are set by the building and fire authority with jurisdiction over your address, which in San Mateo County can be a city department or the county, depending on where the property sits.
  • We confirm what applies to your opening before recommending work, and we tell you when a component repair is not the same as a full compliance inspection of the assembly.

Our 5-Step Hollow Metal Doors Process

  • In San Mateo County, our work follows 5 service-specific steps, from opening survey through code verification.
  • The detailed process below explains what each stage covers so you know what to expect before requesting a visit.

Recent Hollow Metal Doors Projects

Photos from Guardian Door job sites across Northern California. Explore examples of the work we offer in San Mateo County, CA. Project locations are labeled where available.

See more Guardian Door projects →

How Hollow Metal Doors Works in San Mateo County, CA

  1. 1

    Opening survey

    We field-measure the opening, confirm wall type and handing, and identify the required fire rating and hardware set from the existing label and use of the space.

  2. 2

    Specification and quote

    Door gauge, frame type, rating, finish, and the complete hardware schedule are quoted in writing before ordering.

  3. 3

    Fabrication and delivery

    Doors and frames are ordered with factory prep and labels for the specified rating and hardware.

  4. 4

    Installation

    Frames are set plumb, square, and anchored to the wall type; doors are hung and the full hardware set installed to template.

  5. 5

    Code verification

    Rated openings are checked for self-closing, positive latching, correct clearances, intact labels, and required gasketing.

Hollow Metal Doors in San Mateo County, CA — FAQs

Do you provide hollow metal doors in San Mateo County?

Yes. San Mateo County is inside our Northern California service area, and we dispatch to the listed cities in San Mateo County from our Sacramento base. Scheduling depends on the job, so send the address and the problem and we’ll confirm availability.

What parts of San Mateo County do you serve?

We currently cover Burlingame, Daly City, Foster City, Half Moon Bay, Menlo Park, Millbrae, Pacifica, Redwood City, San Bruno, San Mateo, and South San Francisco in San Mateo County.

What should I have ready before the visit?

Opening location, size, and handing (or we field-measure); Required fire rating if known, or a photo of the existing frame label; Wall construction — stud, masonry, or existing frame reuse; Hardware needs — panic device, lockset, closer, card reader prep; Whether the opening must stay secured during the swap.

Can you replace just the door and keep the existing frame?

Often yes, when the frame is plumb, sound, and its label is intact and matches the required rating. We verify frame condition and hardware prep locations first — a new door hung in a racked or unrated frame doesn't give you a compliant opening.

How do I know if my door needs to be fire-rated?

Look for a metal label on the hinge edge of the door and on the frame — it states the rating. Rated openings are typically required at stairwells, corridors, occupancy separations, and mechanical rooms. If a label is missing or painted over, the opening usually needs to be re-established as a rated assembly.

What is a hollow metal door?

A hollow metal door is a steel door built from face sheets over an internal core, hung in a steel frame. It's the standard for commercial back-of-house, stairwell, mechanical, and exterior service openings because it takes abuse and is available in fire-rated assemblies.

Ready to schedule hollow metal doors in San Mateo County, CA?

Send the address and what the door is doing. We’ll confirm availability and next steps.

Speak With Our Team (833) 424-3667 david@guardiandoorllc.com

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Cities we serve in San Mateo County

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