Free on-site gate assessment - hinges, posts, and your LiftMaster or Nice gate operator checked before anything is quoted
The assessment is free and the quote is the invoice.
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AfterFast, Reliable Gate Parts & Welding Across San Mateo
If your gate sags, drags, or won’t close square, the problem almost always traces back to a hinge, a post, a rail, or a weld. Gate parts and welding in San Mateo typically costs between $180 and $1,400 depending on whether we’re reinforcing a fatigued 1960s wrought-iron side gate or cutting out rusted posts at a Mariners Island lagoon property. We’re Gatewood Fence & Gate, locally owned and owner-operated since 2001, with a live person answering every call around the clock. Hal Gatewood has been welding gates on-site across San Mateo’s 94404, 94497, 94401, and 94402 zip codes long enough to know exactly which failure mode you’re dealing with before we even arrive. Call (877) 610-2993 for a free estimate on any repair.
Key Takeaways
- Hinge replacement in San Mateo runs $180-$450 per hinge, including on-site welding and alignment.
- Post replacement, especially with marine-grade stainless in 94404, runs $600-$1,400 per post.
- Custom welding and fabrication for gates in San Mateo starts around $250 and is quoted before any work begins.
- We service FAAC, BFT, Linear, and Viking operators, and stock parts locally for same-week turnaround.
- Every job carries our 90-Day Done Right Promise in writing, plus a free second opinion on any written estimate.
Why Gatewood Fence & Gate Is San Mateo’s Preferred Gate Parts & Welding Company
San Mateo isn’t one city with one gate problem. It’s two. The eastern bay-front neighborhoods in 94403 and 94404, including the Mariners Island lagoon streets, eat standard steel hinge posts and gate frames through salt-air pitting within five to seven years. The western hillsides in 94402, along the Hillsborough line, burn out automated gate motors because slope calibration was never set for the grade. We know the difference because we’ve welded and repaired gates in both conditions across San Mateo for over two decades. Our repair-first approach means we’re in your driveway with a welder and the right stock, not hauling your gate off to some shop you can’t find.
We’re certified to service nine major gate brands, and our crew shows up in uniform, background-checked, and ready to explain what we found before we touch anything. Hal Gatewood’s name is on the shop, the invoice, and the work. That’s the oldest accountability there is. San Mateo homeowners call us because, when a gate sags or a hinge shears, they want a person who knows the difference between a post problem and a panel problem, someone who will fix the post without the panel so they don’t have to fix it twice.
Calls to Gatewood Fence & Gate are answered by a live person, 24/7. Not a voicemail, not a queue. If a gate is hanging off its hinge on a Sunday afternoon in Foster City or a motor overloads at 2 a.m. on a Hillsborough hillside, someone picks up and talks to you. We offer $40 off any repair over $200, no trip charge inside the county, and a permanent 10% discount for seniors and veterans. Every job carries the 90-Day Done Right Promise, in writing, not hedged.
Our Gate Parts & Welding Services in San Mateo
We don’t swap parts that don’t need swapping. Gate Parts & Welding is what we do every day, and we start with the specific failure your gate is showing. A gate sags in the hinge post, not in the middle. So that’s where we start. Here’s how that plays out in San Mateo’s housing stock, from 1940s ranch homes to newer HOA developments in 94403.
Hinge Replacement
San Mateo’s 1940s-1960s ranch homes and post-war bungalows are full of original ornamental wrought-iron side and rear yard gates that are now 60 to 70 years old. Those wrought-iron hinges weren’t built for 70 years of marine-layer moisture cycling. We see fatigue cracks at the hinge post welds, sheared pins, and sag correction needs on nearly every original gate we touch in San Mateo. Hinge replacement runs $180-$450 per hinge in San Mateo, depending on whether we’re working with light-duty residential hardware or heavy-duty ball-bearing hinges, and whether the surrounding steel needs on-site welding reinforcement. We always align the gate and confirm full swing arc before we leave.
Post Replacement
A new post sounds dramatic, but in San Mateo’s 94404 bay-front zip, standard steel posts pitting to structural failure within five to seven years is the norm. Not the exception. We replaced a pair of rust-corroded hinge posts on a swing gate at a Mariners Island lagoon home in 94404. The original mild steel posts had pitted through at the base within six years, so our crew welded in marine-grade stainless replacements with new conformal-coated operator brackets, and then rehung the gate with sag correction to UL 325 photo-eye alignment. Post replacement in San Mateo runs $600-$1,400 per post, including concrete setting, anti-rust bore treatment, and welding the gate back to proper swing geometry.
Rail Repair
Bottom rails on San Mateo gates collect moisture in two ways: direct exposure to fog and bay air in 94404, and runoff from the slope-side topography in 94402. Welding a cracked bottom rail back to a rust-weakened lower frame is usually the right call, especially on ornamental gates where a replacement panel would lose the original look. But if the rail has pitted through in multiple spots, we’ll tell you honestly that repair is a temporary patch, and that a new section welded in from heavier gauge steel will outlast the repair. Rail repair and reinforcement in San Mateo typically runs $250-$700 per rail.
Custom Welding
Custom welding is where San Mateo gates get their second life. We’ve fabricated replacement pickets for 1950s ranch gates, welded French-country scrollwork back onto Hillsborough-facing estate gates, and built complete gate frames from marine-grade stainless for 94404 homeowners who were tired of replacing standard steel every six years. Custom welding in San Mateo starts around $250 for a small repair or bracket reinforcement, and runs up to several thousand for full frame fabrication or major reconstruction. We show you the price in writing before the first arc strikes.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Mateo
We’re certified to service FAAC, BFT, Linear, and Viking operators, among others. That matters in San Mateo because different brands fail differently in this climate. Viking and FAAC solid-state boards don’t love the salt-air particulate in 94404, while BFT and Linear operators installed on steep 94402 driveways often fail from stripped rack and pinion gears caused by improper slope calibration. We stock locally the parts San Mateo customers need most, so you’re not waiting a week for a control board. We weld the operator brackets, align the racks, and service the full swing. Same crew, same invoice, same 90-Day Done Right Promise.
Common Gate Parts & Welding Problems We See in San Mateo Homes
- Salt-air pitting on 94404 steel posts and hinges. Marine air from the bay carries chloride particulate that accelerates rust on mild steel. We see gate posts, hinge pins, and operator brackets that look 30 years old when they’re only six. We quote marine-grade stainless as standard for bay-front San Mateo properties.
- Fatigue cracking on original 1940s-1960s wrought-iron gates. Decades of moisture cycling and daily opening and closing cause micro-cracks at hinge welds on San Mateo’s original ranch gates. Those cracks spread into full rail separations if they’re not welded and braced in time.
- Steep-grade operator failure on 94402 hillsides. Automated driveway gates along San Mateo’s western hills, near the Hillsborough border, sit on significant inclines. If the operator wasn’t calibrated for the grade on installation, the motor overworks every cycle and the rack and pinion strip. Welding the rack mount and recalibrating the operator is a repair, not a replacement.
- HOA and condominium gate code-compliance issues. Newer HOA and condo developments in 94403 and 94404 use automated sliding gates that must comply with California’s UL 325 entrapment-protection sensor requirements. We regularly repair gates that are out of compliance, including re-welding photo-eye brackets and replacing corroded edge sensor mounts.
Pricing for Gate Parts & Welding in San Mateo, CA
Here’s what gate parts and welding actually cost in San Mateo’s market. Hinge replacement: $180-$450 per hinge. Post replacement: $600-$1,400 per post, including excavation, concrete, and welding. Rail repair and reinforcement: $250-$700 per rail. Custom welding: $250 and up, quoted by the job after we see the gate. A typical full gate repair involving two hinges, a post sleeve, and rail reinforcement in San Mateo runs $900-$1,800. These are San Mateo prices, not San Francisco prices with a trip fee attached. We offer a free second opinion on any written estimate, and we’ll beat a written, higher quote for the same scope by $40, taken off at the invoice. The job is quoted and agreed before any work starts, in writing. Call (877) 610-2993 for an exact quote. Estimates are free, and there’s no trip charge inside the county.
We Also Serve Cities Near San Mateo
Our crews work throughout San Mateo County, from the bay-front streets to the Peninsula hills. In addition to San Mateo, we serve Foster City, Belmont, Hillsborough, and Redwood Shores. If you’re in any of those neighboring cities and your gate is sagging, sticking, or sitting open because the motor quit, call us. Dispatch and scheduling for the area are coordinated from our San Francisco Bay Area office, and our local San Mateo crews handle the work on-site.
Serving San Mateo, CA - Our Local Coverage Area
We’re based in the San Mateo area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Gate Parts & Welding in San Mateo
Because the eastern neighborhoods of San Mateo sit directly on the San Francisco Bay shoreline. Chloride particulate from the marine air settles on steel gate hardware and accelerates rust and pitting far beyond what you’d see in Redwood City, which is set back from the water. In 94404, standard mild steel hinges and posts pitting to structural failure within five to seven years is the normal failure timeline, while in Redwood City the same hardware might last twelve or fifteen years. The fix in San Mateo is marine-grade stainless hinges and conformal-coated brackets, which we quote as standard for bay-front properties. Call (877) 610-2993 for a free inspection and a written quote.
Yes, and that’s exactly where our on-site welding approach matters. The original ornamental wrought-iron gates on San Mateo’s ranch homes are part of the house’s character, so we repair them in place. We TIG-weld fatigue cracks, splice in replacement pickets forged to match the original scrollwork, and re-set hinge posts without disturbing the gate’s original proportions. A replacement gate would change the whole house, but a welded repair preserves what’s there. If the damage is too extensive, we’ll tell you to replace instead, because welding rusted iron that’s lost its structural integrity is wasted work. Estimates are free, and the price is set before we start.
Often, yes. When an automated gate is installed on a steep San Mateo hillside without proper slope calibration, the operator works against gravity on every cycle. That constant strain overloads the motor, strips the rack and pinion gears, and eventually fails the operator entirely. Welding is part of the fix because we remove the stripped rack, weld in a new gear track with correct alignment to the motor’s pinion, and add reinforcement brackets at the stress points. Then we recalibrate the operator for the actual grade and check the UL 325 photo-eye alignment. The repair cost in San Mateo usually runs $500-$1,200, a lot less than a new gate system. Call us at (877) 610-2993 and we’ll come look at the grade and the operator.
Yes, that’s exactly right, and it’s the first thing we check on any San Mateo gate repair. A gate sags in the hinge post, not in the middle, because the post is the structural anchor. If the post is rusted through at the base, usually from years of ground moisture or, in 94404, salt-air pitting, then welding the panel or the rail is temporary at best. You’ll fix the panel without the post and you’ll fix it twice. We replace the rusted post first, set it in concrete with anti-rust bore treatment, and only then weld the panel and align the swing. Post replacement plus panel welding in San Mateo runs $600-$1,800 depending on the post condition and the gate’s weight. The quote is in writing before work starts.
It won’t, as long as the welder knows where the sensors live and respects the alignment. When we weld on any automated San Mateo gate, we either shield the photo-eye sensors or remove them and re-mount them to the original spec after the welding is done. The UL 325 standard requires that entrapment-protection sensors be mounted at specific heights and angles, and we re-verify that alignment as part of the repair. If we’re welding new brackets for photo-eyes on a corroded 94403 or 94404 gate, we use stainless or conformal-coated mounts so the new brackets don’t rust out inside a few years. Our 90-Day Done Right Promise covers the sensor mounting, the welds, and the gate operation.
If you live in San Mateo and you’re holding a gate together with hope, call (877) 610-2993. You’ll get a live person on the line, a free estimate in writing before any work starts, and a gate that closes square again. We’re Hal Gatewood’s crew, based in the Bay Area and working in San Mateo every week, with the 90-Day Done Right Promise on every invoice.
Written by Hal Gatewood, Owner at Gatewood Fence & Gate, serving San Mateo since 2001.