Kitchen remodeling
Bathroom remodeling
Home additions & ADU
Roofing
Windows & doors
Driveway & pavers
FenceFree written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across Belmont
A general contractor in Belmont handles the whole build, not just one trade, and costs here run from roughly $5,000 for a small bathroom remodel to $130,000 for a full addition. Belmont’s hillside lots and canyon microclimates mean the materials we specify have to survive salt fog, heavy winter rain, and steep-grade runoff. That’s the difference between a job that lasts and one that rusts out in five years. If you’re planning a kitchen, a deck, an ADU, or a whole-home renovation in Belmont, call us at (855) 901-7266 for a free estimate.
Why San Mateo Construction Is Belmont’s Preferred General Contractor Company
We’ve spent years working Belmont’s sloped parcels, from the flats near Ralston Avenue up into the canyons off Hallmark Drive and Christian Drive. Our crews know which streets can’t take a full-size dumpster, which lots need a debris chute instead of a wheelbarrow, and which hillside permits Belmont’s building department wants before you touch a retaining wall. That local knowledge cuts days off planning and prevents rework.
What separates our approach is the single contract. The same General Contractor team that re-roofs your house can also remodel the kitchen, replace the windows, and pour a paver driveway. One crew, one schedule, one warranty. Belmont homeowners who have tried juggling three separate trades on a sloped lot know what a headache that is.
And the brand access matters. We specify James Hardie siding for fog-exposed elevations, stainless or hot-dip galvanized hardware as standard on decks and fences, and we stock common marine-grade fasteners locally so a hardware issue doesn’t stall a Belmont job for a week.
Styles & brands we work with
Hire a General Contractor in Belmont
Hire a General Contractor in Belmont when the job touches more than one system, your foundation, or your roofline. A single trade can swap a vanity. A general contractor manages structural, exterior, and interior scope under one contract. In Belmont, that often means hillside foundation work, drainage correction, re-roofing, Belmont ECO Window Systems service for window replacement, and a kitchen or bath remodel running concurrently.
What that costs depends on which systems are involved. A bathroom remodel in Belmont typically runs $9,000 to $28,000. A kitchen runs $14,000 to $45,000. An addition starts around $45,000 and can reach $130,000 on a steep lot with foundation piers and retaining work. The coastal-spec materials we default to add roughly 8 to 15 percent over inland pricing, which we’ll explain in detail below.
Whole-Home Coordination
When a Belmont house needs re-roofing, new windows, a kitchen remodel, and drainage work, we sequence them so you’re not living through construction twice. The roofline protection goes on first, then exterior waterproofing, then interior finish work. It’s the opposite of hiring four separate contractors and hoping their schedules line up.
Hillside and Slope-Work Permits
Most Belmont hillside work, deck replacements, retaining walls over three feet, and any drainage alteration require city permits and sometimes geotechnical review. We pull those permits and manage the inspections. A homeowner who skips this on a canyon lot can be ordered to dismantle unpermitted work.
General Contractor Services in Belmont
General Contractor Services in Belmont span from roofline to foundation, which matters here because the fog and hillside runoff attack both ends of that range. We replace roofs, install impact windows, rebuild decks, pour driveways and patios, finish basements, build room additions, and construct ADUs. The same crew that specs a GAF or Owens Corning roof can install the Cambria countertop in the kitchen below it.
Exterior work on Belmont’s salt-fog side of the hill gets a different fastener and flashing spec than interior work on the sunny side. It’s not an upsell. It’s the difference between a deck that lasts twenty years and one that needs a structural repair in six.
Additions and ADU Construction
Belmont’s tight parcels mean most additions go up or into hillsides rather than out. We build conventional stick-framed ADUs and also work with prefab manufacturers like Boxabl and Plant Prefab when the lot access favors modular delivery. A garage conversion in Belmont runs $30,000 to $80,000. A full ADU runs $90,000 to $220,000 depending on slope work and prefab versus stick-built.
Exterior Systems and Hardscape
Paver driveways on Belmont slopes need a sealed joint system and a properly compacted base, or winter runoff will scour the bedding sand and settle the pavers within two seasons. That’s a $7,000 to $18,000 job done correctly with Techo-Bloc or Belgard pavers. Done cheaply, the repair costs more than the original difference.
What happens when you call
- 1
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 Belmont
We’re not tied to a single supplier line, which means we can be honest about what belongs on a Belmont house. James Hardie siding holds up on fog-exposed elevations where cheaper fiber cement swells at the cut edges. We install GAF, CertainTeed, and Owens Corning roofing systems, and we specify stainless or hot-dip galvanized hardware as standard on decks, fences, and railings because we’ve seen what standard zinc-plated connectors look like after three foggy winters in the Belmont Hills. For prefab ADUs, we work with Boxabl and Plant Prefab. We keep common marine-grade fasteners in stock so Belmont customers aren’t waiting on a parts order.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in Belmont Homes
- Rusted deck hardware on fog-side lots. Standard electro-galvanized joist hangers and screws corrode from salt-laden air within a few years, especially on canyons off Hallmark Drive and Christian Drive. We specify hot-dip galvanized hangers and stainless fasteners as the baseline, not the upgrade.
- Retaining wall failures after winter storms. Hillside lots in the Belmont Creek watershed shed water fast, and walls without proper drainage, weep holes, and backfill collapse under hydrostatic pressure. We rebuild them with drainage behind the wall, not just in front of it.
- Pitted and seized window frames. Low-grade aluminum or cheap vinyl frames on the coastal fog side pit, corrode, and seize within a decade. We spec PGT or Therma-Tru units with marine-grade finishes for west-facing Belmont elevations.
- Paver settlement on sloped driveways. Without a sealed joint system and proper base compaction, winter runoff scours the sand bed and the pavers sink and shift. We see this on nearly every sloped driveway we’re called to fix in Belmont.
Pricing for General Contractor in Belmont, CA
Here’s what typical Belmont jobs cost with coastal-spec materials included. The range reflects lot slope, access, and whether we’re correcting a prior failure or building fresh.
| Service | Belmont Price Range |
|---|---|
| Roof Replacement | $8,000 – $20,000 |
| Window Replacement | $4,500 – $15,000 |
| Paver Driveway Installation | $7,000 – $18,000 |
The coastal specification, stainless hardware, marine-grade window frames, sealed paver joints, hot-dip galvanized connectors adds roughly 8 to 15 percent to materials cost on a typical Belmont job. The inland-spec version looks cheaper on the bid, but we’ve replaced decks where that “saved” money became a $15,000 structural repair within seven years. Quotes from us are written, line-itemed, and free. Call (855) 901-7266 to schedule yours.
We Also Serve Cities Near Belmont
Our crews work throughout the Peninsula, including Belmont, San Carlos, Highlands-Baywood Park, San Mateo, and Redwood Shores. If you’re in a nearby city planning a remodel or addition, the same General Contractor team and coastal-spec material standards apply. Call us for a free estimate anywhere along the lower Peninsula.
Serving Belmont, CA — Our Local Coverage Area
We’re based in the Belmont 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 About General Contractor in Belmont
Belmont’s hillside lots sit in the fog belt, and salt-laden ocean air cycles against metal hardware for months at a time, then winter rain saturates it. Standard zinc-plated or electro-galvanized fasteners and hangers corrode through within five to seven years on a fog-side elevation. We specify hot-dip galvanized hangers and stainless steel screws as standard on every Belmont deck, fence, and railing we build or repair. If you’re pricing a deck rebuild in Belmont, call (855) 901-7266 and we’ll walk you through the right hardware spec.
Not always. Houses on the eastern flats near Ralston Avenue get far less fog exposure than canyon lots on the west side of the Belmont Hills. But if your windows face west or southwest into the fog path, marine-grade frames will outlast standard aluminum by a decade or more. We spec PGT or Therma-Tru with coastal finishes on fog-side elevations and standard frames on protected elevations. It keeps costs honest instead of blanket-upgrading every window. For an exact quote on your house, call (855) 901-7266.
Expect to add roughly 8 to 15 percent to the material cost of exterior-facing work, decks, fences, windows, roofing fasteners, and paver joints. That’s the honest price gap between the coastal-spec and the inland-spec version of the same job. The inland-spec bid looks cheaper up front but typically fails within a decade here, and the repair bill erases the savings. We quote both ways so you can see the difference in writing. Call (855) 901-7266 for a free, line-itemed estimate.
Retaining walls over three feet, most deck replacements, and any drainage alteration on a sloped lot require a Belmont building permit, and steeper slopes often need a geotechnical review. We pull all permits and manage the inspections as part of the job. Unpermitted hillside work can be ordered removed by the city, and it’s a common red flag when a Belmont house goes up for sale. If you’re unsure whether your project needs permits, call (855) 901-7266 and we’ll tell you straight.
Yes. We rebuild failed retaining walls with proper drainage behind the wall, weep holes, and compacted backfill, then we often add a surface drainage swale uphill to keep runoff from pooling against the wall in the first place. On a steep lot off Christian Drive, our crew tore out a failing redwood deck whose joist hangers had rusted through from fog and storm cycles, then rebuilt it with hot-dip galvanized hangers, stainless screws, marine-grade flashing tape, and a drainage swale to divert hillside runoff that had been pooling against the foundation. That’s the difference between patching a symptom and fixing the cause. Call (855) 901-7266 for a free drainage assessment.
Written by Noel Carrington, Owner at San Mateo Construction, serving Belmont since 2011.