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 Alum Rock
A general contractor in Alum Rock handles the full build: permits, subs, materials, inspections, and the punch list at the end. If you’re planning a room addition, an ADU, or a whole-home remodel on an older East San Jose lot, you need someone who knows the unincorporated Alum Rock boundary before the first hammer swings. We’ve been running jobs here long enough to know which parcels answer to Santa Clara County and which answer to City of San Jose. Call (855) 901-7266 for a free estimate on your project.
Why San Mateo Construction Is Alum Rock’s Preferred General Contractor Company
Alum Rock is a small, historic pocket of East San Jose where the housing stock skews older and the lots are tighter than most people expect. That changes how a general contractor has to work. We’ve scoped projects on Alum Rock Avenue homes, on quiet side streets off Kirk Avenue, and on larger parcels closer to the Diablo Range foothills. Each one comes with its own permitting story.
Our owner, Noel Carrington, has built San Mateo Construction around a straightforward promise: one licensed contract, one team responsible for everything. When a homeowner in Alum Rock hires us, they’re not juggling a roofer, a plumber, and a drywall crew. They’re calling one number and getting a single accountable general contractor who manages the full sequence.
We carry relationships with over 50 name-brand suppliers across roofing, windows, cabinetry, countertops, plumbing, siding, hardscaping, and prefab ADU manufacturing. That means we can spec GAF or CertainTeed roofing, Therma-Tru exterior doors, and Cambria or Silestone countertops without sending you to a showroom and saying “good luck.” We walk you through the options, line-item the quote, and keep the whole thing moving.
Styles & brands we work with
Residential General Contractor in Alum Rock
A residential general contractor in Alum Rock takes a project from the first site walk to final inspection and sign-off. Here, that often means working inside the limits of a compact mid-century lot, preserving what can be preserved, and rebuilding what can’t. The typical residential job involves permit acquisition, demo, rough-in for electrical and plumbing, framing, drywall, finishes, and scheduling every inspection so county or city sign-off doesn’t stall the job. A kitchen remodel in Alum Rock runs $14,000 – $45,000 depending on cabinet grade, countertop selection, and how much of the existing layout survives. A bathroom remodel runs $9,000 – $28,000, with walk-in showers landing between $4,500 and $12,000.
Whole-Home Remodels on Older Alum Rock Lots
Many Alum Rock homes were built in the 1950s and 60s, and the systems haven’t all kept up. We routinely find original wiring, outdated drain lines, and foundation cracks that change the scope once walls are opened. That’s not a surprise we hide from, it’s exactly why a whole-home remodel here needs a contractor who plans for those discoveries upfront. We write allowances into the scope so you see what a realistic budget looks like before the first cut.
Room Additions and Garage Conversions
A home addition in Alum Rock typically runs $45,000 – $130,000, and a garage conversion runs $30,000 – $80,000. On the county parcels, these almost always trigger a jurisdiction check first. We verify whether the address falls under Santa Clara County or City of San Jose permitting before we quote, because the wrong permit path adds weeks and re-inspection fees.
Hire a General Contractor in Alum Rock
When you hire a general contractor in Alum Rock, you’re paying for someone to own the entire sequence: planning, permits, materials, labor, inspections, and close-out. That’s what San Mateo Construction does. We quote line-item pricing so you see exactly where money goes, and we hold those numbers unless the site itself changes the scope. ADU construction in Alum Rock runs $90,000 – $220,000 depending on size, site work, and whether the parcel has well and septic constraints. A detached garage or shop can be the most efficient square footage you ever build, but only if the grading, drainage, and setback work is scoped before you see a final number.
Single-Source Accountability from Roofline to Foundation
One contractor, every system. That’s the real advantage here. The same team that re-roofs the house can gut and remodel the kitchen, replace the windows, and pour a paver driveway. In Alum Rock, where lots are tight and schedules are tighter, that coordination matters more than on a sprawling new-build site.
Brand Access Without the Guesswork
We help you choose real, vetted brands, not whatever a supply house happens to have in the yard that week. KraftMaid or Wellborn cabinetry, Cambria or Caesarstone countertops, Kohler or Grohe plumbing fixtures. On larger exterior jobs we spec PGT or Therma-Tru windows and doors, James Hardie siding, and GAF or Owens Corning in Alum Rock roofing. Those are material decisions, not decoration decisions. They’re part of how we quote.
Building on Acreage Around Alum Rock
Alum Rock is an unincorporated pocket of East San Jose where the Santa Clara County and City of San Jose permitting boundary cuts through the neighborhood. On any given block, the same addition can require a county building permit and county inspection sequence rather than a city one. On the larger lots at the foot of the Diablo Range, county rules on wells and septic setbacks govern where a shop or detached ADU can legally sit. That’s not a technicality. That’s the first question we ask.
We scoped a detached ADU and shop behind an older stucco-and-wood-frame house off the Alum Rock Avenue corridor where the lot fell under Santa Clara County rather than San Jose. Before we ever discussed finishes, we confirmed well and septic setbacks and laid out a grading and drainage plan. Our crew ran the rough-in, held the county inspection sign-off at framing and underground, then kept the scope of work, allowances, and any change order in writing so the client could see exactly which line items moved when we hit unexpected soil on the pad. We closed the punch list with the new subfloor in the ADU bath and the load-bearing header tying the shop to the existing structure.
Long material hauls and equipment access on open acreage lots also change the numbers. A lot that looks flat from the road can hide a grade change that needs fill, compaction, and a retaining course before a foundation goes in. We scope that before we quote, not as a change order after the fact.
Trusted Brands We Service in Alum Rock
We don’t show up with a pickup truck and a “we’ll figure it out” attitude. For Alum Rock jobs we stock and order from brands we trust: General Contractor work means the materials are only as good as the installers behind them, so we pair those brands with crews who have installed them for years. Therma-Tru doors hold up to the hot east-side summers, ViewLux windows make sense on tight-lot remodels where sightlines matter, and ECO Window Systems give budget-conscious Alum Rock homeowners a solid mid-tier option. Whatever the system, we get the right material ordered and on site before the crew needs it.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in Alum Rock Homes
- The wrong permit jurisdiction. Pulling a City of San Jose permit on an unincorporated Alum Rock parcel, or the reverse, gets the work flagged and re-inspected. We check county jurisdiction before we quote, because that’s a $1,000-plus mistake on the wrong block.
- Old stucco-and-wood framing hiding surprises. Mid-century Alum Rock homes are full of wall cavities with outdated wiring, settled foundations, and framing that was never meant to carry a second-story load. We plan for discovery, and we show you the allowance line before we open a wall.
- Grading and drainage scoped too late. On larger lots near the Diablo Range, a detached ADU or shop without a grading and drainage plan can get kicked back by county review. We bring that work into the upfront scope, not the change-order log.
- Draw schedules blown by long hauls. Open acreage lots on the east side mean material deliveries eat time and fuel. We sequence deliveries and equipment access before the rough-in starts so the draw schedule doesn’t outpace the work.
Pricing for General Contractor in Alum Rock, CA
Alum Rock pricing tracks San Jose generally, but county-permit parcels and older homes shift the numbers a bit. Here are the ranges we quote most often for General Contractor in Alum Rock projects:
| Project | Typical Range in Alum Rock |
|---|---|
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
What moves the number? Site access, permit path, foundation condition, material grade, and how much of the existing structure stays. We quote line-item so you see the real drivers. Call (855) 901-7266 to schedule a free estimate and get a written scope for your exact address.
We Also Serve Cities Near Alum Rock
Our crews work across East San Jose and the neighboring communities, including Alum Rock, East Foothills, San Jose, Seven Trees, and Buena Vista. If your job is in the 95127 ZIP or a neighboring county pocket, we can usually get a site walk scheduled within a few days.
Serving Alum Rock, CA — Our Local Coverage Area
We’re based in the Alum Rock 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 Alum Rock
Yes. Detached ADU construction in Alum Rock runs $90,000 – $220,000, and the first step is confirming your parcel’s well and septic setbacks under Santa Clara County rules. We scope the grading, drainage, and foundation costs before we quote, so you’re not surprised by a change order once the county reviews the site plan. Call (855) 901-7266 for a site-specific estimate.
County permitting adds a review layer and a different inspection sequence than City of San Jose permits. We verify jurisdiction by your parcel number before we pull anything. That adds some upfront time, usually a few days to two weeks depending on the scope, but it prevents the bigger delay and re-inspection fees that come from pulling the wrong permit. We handle it all under the same contract.
We sequence deliveries and material drops around the rough-in schedule so we’re not paying crews to wait on a truck that’s stuck behind an equipment load. On open acreage lots, we’ll stage materials near the pad and plan vehicular access before the first excavation. The goal is simple: keep the project moving without burning budget on idle time.
We typically schedule site walks in Alum Rock within a few business days, and a written estimate follows within a week for most residential projects. The actual construction start depends on permit lead time, which runs longer on county parcels. Call (855) 901-7266 and we’ll give you a straight answer for your specific address.
We provide a written workmanship warranty on the labor we perform, and the materials carry their own manufacturer warranties from brands like GAF, Therma-Tru, Cambria, James Hardie, and Kohler. We walk you through both sets of terms before you sign. For a project-specific warranty question, call (855) 901-7266.
Your Next Step in Alum Rock
If you own a home in Alum Rock, CA and you’re weighing a remodel, an addition, an ADU, or a garage conversion, the first call is the free one. We’ll walk the site, check the jurisdiction, and give you a written scope with real numbers. No vague allowances, no mystery line items. Call (855) 901-7266 to schedule your free estimate and talk through the project.
Written by Noel Carrington, Owner at San Mateo Construction, serving Alum Rock and the wider Bay Area.