Santa Clara County, California
Hollow Metal Doors & Frames in Sunnyvale, CA
Commercial buildings, schools, healthcare, industrial, and multifamily properties in Sunnyvale 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.
- Licensed & insured
- Fast response
- 5.0 on Google
California CSLB #1025448
Verify on the CSLB siteFully 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 Sunnyvale
Guardian Door LLC provides hollow metal door and frame installation, including fire-rated openings and full hardware sets for Sunnyvale and nearby Santa Clara County communities. Sunnyvale is about 89 miles south of our Sacramento base, in Santa Clara County. We also cover nearby Mountain View, Cupertino, and Los Altos. The complete breakdown is in our hollow metal doors guide.
- Gasketing, coordinators, and thresholds
- Welded and knock-down hollow metal frames
- Hinges, closers, exit devices, and locksets
- Fire-rated door and frame assemblies
- Security and exterior steel doors
- Door-only replacement in sound existing frames
Hollow metal openings we assess in Sunnyvale
- 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 Sunnyvale can be a city department or the county, depending on where the property sits.
- We check 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 Sunnyvale, 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 Sunnyvale, CA. Project locations are labeled where available.
How Hollow Metal Doors Works in Sunnyvale, CA
- 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
Specification and quote
Door gauge, frame type, rating, finish, and the complete hardware schedule are quoted in writing before ordering.
- 3
Fabrication and delivery
Doors and frames are ordered with factory prep and labels for the specified rating and hardware.
- 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
Code verification
Rated openings are checked for self-closing, positive latching, correct clearances, intact labels, and required gasketing.
Hollow Metal Doors in Sunnyvale, CA — FAQs
Can you send a technician to Sunnyvale for hollow metal doors?
Yes. Sunnyvale is inside our Northern California service area, and we dispatch to Sunnyvale and nearby Santa Clara County communities from our Sacramento base. Scheduling depends on the job, so send the address and the problem and we’ll confirm availability.
What is the difference between a welded and a knock-down frame?
A welded frame arrives as one rigid unit and is set before the wall is finished — it's stronger and standard on new construction and masonry. A knock-down frame ships in three pieces and assembles around an existing finished wall, which makes it the usual choice for replacement work.
How far is Sunnyvale from your base?
We dispatch from Sacramento. Sunnyvale is roughly 89 miles south of our base, inside our 100-mile service radius.
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.
What information helps you prepare?
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.
Do you install the hardware too?
Yes — hinges, continuous hinges, closers, exit devices, locksets, thresholds, coordinators, and gasketing, installed to template. On rated openings the hardware is part of what makes the assembly compliant, so it isn't something to leave to another trade.
Explore more
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