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 San Martin
For homeowners in San Martin, finding a general contractor who understands unincorporated Santa Clara County is the difference between a smooth project and one stalled at the permit counter. Millwright Builders works across the full built environment of a home, from roofing and structural renovation to kitchen finishes, hardscape, and ADU additions, under one accountable roof. We know Llagas Road ranchettes, the older farmhouse parcels, and the newer custom homes off Highland Avenue. If you’re planning a remodel, addition, or ADU, call us at (866) 925-0334 to schedule a free estimate and we’ll walk your specific parcel through County requirements before anyone swings a hammer.
Why Millwright Builders Is San Martin’s Preferred General Contractor Company
San Martin homeowners hire us because we already know what their property needs. A standard tract home in Morgan Hill plugs into municipal sewer and water. A San Martin ranchette on a private well and septic system does not. That single fact changes how a bathroom addition, kitchen remodel, or ADU gets permitted, sized, and sequenced. Our General Contractor team handles the full scope: framing, rough-in, finishes, exterior work, and the County paperwork that ties it together. Noel Castañeda leads each project with a written scope of work and draw schedule, so owners see exactly what each payment covers before it’s due.
San Martin clients tell us the same thing: they don’t want to coordinate five different subs and then chase down whoever dropped the ball. One contract, one point of accountability, and a builder who can speak fluently about the materials going into the job. From the roofline to the back patio, one contractor, one conversation.
Styles & brands we work with
Licensed General Contractor in San Martin
A Licensed General Contractor in San Martin does more than pull permits. In unincorporated Santa Clara County, the contractor is the party who sequences the work so that County Building/Planning inspections, septic capacity checks, and well-yield tests all line up without killing the schedule. Millwright Builders operates as a licensed general contractor, and when a San Martin homeowner adds a bathroom or converts a garage, we map the inspection milestones before we give you a start date. A permitted home addition in San Martin typically runs $45,000 – $130,000 depending on scope, and an ADU runs $90,000 – $220,000.
Full-Scope Accountability
One license covers interior remodeling, roofing, windows and doors, fencing, and hardscape. That means the framing crew, the roofer, the cabinet installer, and the hardscape crew all answer to the same written scope. Your renovation shouldn’t require you to become a project manager.
County-Savvy Permitting
San Martin parcels are not city parcels. We check jurisdiction before we quote, because pulling the wrong permit stalls the draw schedule. County review for an addition or ADU often includes septic capacity verification and a well-yield test, and we build those timelines into the project plan from day one.
Residential General Contractor in San Martin
A Residential General Contractor in San Martin works on homes that don’t match any single-era template. The housing stock here mixes 1960s ranch-style homes on large lots with newer custom builds and ranchettes on acreage. Homeowners call us for the projects that cross trade lines: a kitchen remodel that leads into a roofline repair, a garage conversion that becomes an ADU, a bathroom update that requires moving rough-in on a septic-served lot. Kitchen remodels in San Martin run $14,000 – $45,000, and bathroom remodels run $9,000 – $28,000.
Builder-Grade Upgrade Sequencing
Newer San Martin homes often come with builder-grade cabinets, laminate counters, and stock light fixtures. We sequence upgrades so warranty-covered items stay covered and the trades you want done right get done once. That often means the kitchen first, then the primary bath, then the exterior.
Room Additions and Garage Conversions
A room addition on a San Martin ranchette is not a suburban bolt-on. Lot grading, drainage for winter runoff, and septic capacity all shape what’s feasible. Garage conversions run $30,000 – $80,000 and frequently trigger the same County reviews that a full ADU does, so we plan for both from the start.
Trusted Brands We Service in San Martin
We specify the brand, explain the trade-off, and stand behind the install. San Martin homeowners choose from a curated network of 50+ established manufacturers across cabinetry, countertops, roofing, windows, doors, plumbing fixtures, fencing, hardscape, siding, and prefab/ADU structures. Roofing material partnerships include GAF, CertainTeed, Owens Corning, and IKO, while countertop sourcing includes Cambria, Silestone, and Caesarstone. For roofing specifically, we also work with Atlas and Boral when the job calls for a specific profile or fire-resistant rating. Built to the material’s standard, not just to code.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in San Martin Homes
- Builder warranty voided by early renovations. Cutting into a load-bearing wall or moving rough-in before the original builder’s one-year walkthrough is documented can void coverage. We sequence upgrades so warranty-covered items stay covered.
- Wrong jurisdiction permits. Treating San Martin like a city job and pulling municipal permits when the parcel is unincorporated County stalls the whole draw schedule. We verify jurisdiction before we quote.
- Septic and well surprises mid-build. Quoting a flat remodel without checking septic capacity or well yield, then discovering mid-build that the added bathroom or ADU can’t legally be served, is a costly and common failure. We check first.
- Drainage problems on sloped rural lots. San Martin’s wet winters send runoff across unpaved and sloped parcels. A remodel or addition that doesn’t address grading and drainage can undermine new work within a season or two.
Pricing for General Contractor in San Martin, CA
San Martin pricing reflects the reality of rural unincorporated construction: permits go through the County, septic and well reviews add soft costs, and material runs sometimes mean longer lead times than a Gilroy customer would see. Here are the ranges we see for the upgrades homeowners ask about most:
| Project | Typical Range in San Martin |
|---|---|
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
| Cabinet Installation | $4,000 – $13,000 |
| Countertop Installation | $2,000 – $6,500 |
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
What moves the number? Septic capacity, well yield, site grading, and whether you’re working within a builder warranty or starting fresh. We give written line-item quotes with fixed pricing and no change orders. Call (866) 925-0334 for a free estimate.
We Also Serve Cities Near San Martin
While this page is written for San Martin homeowners, our crews regularly work in Morgan Hill, Gilroy, Amesti, and Corralitos. The County review process and rural parcel realities carry over into several of those areas, and we’re already familiar with the local planning offices and inspection schedules.
Serving San Martin, CA — Our Local Coverage Area
We’re based in the San Martin 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 San Martin
Start with the kitchen counters and cabinet hardware, then the primary bath vanity and shower trim. Those are the surfaces you touch every day and the ones buyers notice first. A full kitchen remodel in San Martin runs $14,000 – $45,000, but a countertop-only upgrade runs $2,000 – $6,500 if your cabinet boxes are sound. Leave the roof, windows, and structural elements alone unless they’re actually failing, and don’t touch anything load-bearing before the builder’s one-year walkthrough is documented. Call (866) 925-0334 and we’ll walk your home with you.
Not if it’s sequenced correctly. The warranty typically covers the original builder’s work, not damage caused by a later contractor. The risk comes when a remodel cuts into a load-bearing wall, moves rough-in, or alters the building envelope before the builder’s one-year walkthrough is documented. We schedule upgrades to start after the walkthrough, and we photograph and document existing conditions so warranty-covered items stay covered. For an exact scope and schedule, call (866) 925-0334.
San Martin is unincorporated Santa Clara County, so additions and ADUs go through County Building/Planning, not a city planning department. That means the review can include a septic capacity check and a well-yield test if your parcel isn’t on municipal service. We verify jurisdiction and the review path before we quote, because nothing stalls a draw schedule faster than the wrong permit. Call (866) 925-0334 for a free estimate with the permitting path mapped out.
A kitchen or bath remodel in San Martin typically runs 6 to 12 weeks once permits are issued, depending on whether septic or well reviews are triggered. County permit review for a simple remodel can add 2 to 6 weeks, and an ADU or addition can add several months. We build the inspection milestones into the draw schedule so you always know what’s next. Call (866) 925-0334 and we’ll give you a realistic timeline for your scope.
Kitchen countertops and a real backsplash, primary bath vanity replacement, a walk-in shower conversion, and sometimes a paver patio off the back of the house. Those upgrades run $3,500 – $12,000 for the shower, $800 – $3,000 for a vanity, and $3,500 – $11,000 for a paver patio. On a newer ranchette off Llagas Road, we took a builder-grade kitchen to a real working kitchen: rough-in adjustments behind the wall for a relocated island circuit, KraftMaid cabinets, a Cambria quartz top, and a Blanco sink, all pinned to a written scope of work and draw schedule so the owners could see exactly what each draw covered. Before we closed anything up, County inspection sign-off came through on the framing and rough-in, and the punch list was down to touch-up paint by week six. Call (866) 925-0334 to schedule your free estimate.
Written by Noel Castañeda, who leads Millwright Builders serving San Martin and greater Santa Clara County with full-scope residential general contracting.