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
General contractor work in San Martin means navigating Santa Clara County’s unincorporated building rules, and the right team changes how smoothly the whole thing runs. We handle additions, remodels, roofs, ADUs, and full interior-to-exterior scopes on the ranch homes and acreage parcels that define this area. Our crews know the county review process, the WUI fire-hardening requirements, and the clay soils that sit under much of San Martin. Call (855) 382-3257 to talk through your project and get a free estimate.
Why Toolbox Contractors Is San Martin’s Preferred General Contractor Company
San Martin homeowners keep calling us because we show up understanding the county’s rules before the first inspection happens. The unincorporated status here changes everything: permits go through Santa Clara County, fire codes lean on defensible space and Class A materials, and former orchard parcels come with soil conditions that a contractor working only in Morgan Hill never sees. We work in San Martin regularly enough to know which projects trigger a geotechnical report and which products satisfy the county on the first submittal.
Our General Contractor team operates as a single point of accountability. One contract covers the kitchen cabinets, the replacement roof, the fence, the paver patio, and the ADU. You are not coordinating five subs and hoping they talk to each other. You are calling one team, and Norm Castellano owns the outcome.
The brand access matters here too. We install Cambria and Caesarstone countertops, PGT impact windows, and GAF roofing systems with the installer credentials those manufacturers require. Homeowners in San Martin researching materials recognize these names, and they want a contractor who can actually spec and install them without a blank stare.
Styles & brands we work with
Construction Company in San Martin
Construction Company work in San Martin usually means additions, structural upgrades, outbuilding construction, and foundation repair on parcels that predate modern building codes. A Home Addition in San Martin typically runs $45,000 – $130,000 depending on the square footage, foundation work, and the county’s WUI review layer. ADU Construction ranges from $90,000 – $220,000, and in San Martin that number often includes septic evaluation, defensible space planning, and soil reports that city projects never see.
WUI Fire-Hardening and Structural Scope
Any exterior assembly we build here has to answer to Santa Clara County’s wildland-urban interface requirements. That means Class A roof coverings, ember-resistant vents, and non-combustible siding choices on many San Martin parcels. We carry GAF and Owens Corning lines certified for these zones, and we document every sign-off so the paper trail is clean.
Foundation Work on Former Orchard Land
The clay-heavy soil under much of San Martin expands and contracts with winter rain and summer heat. When we’re adding square footage, we bring in a geotechnical engineer before the forms go up. It adds time up front and saves a cracked slab and a failed county inspection later.
Remodeling Contractor in San Martin
Remodeling Contractor work in San Martin covers the mid-century ranch homes and farmhouses that dominate the housing stock here. A Kitchen Remodel in San Martin typically runs $14,000 – $45,000. A Bathroom Remodel lands between $9,000 and $28,000. Rooms built in the 1950s and ’60s hide surprises: outdated wiring, undersized headers, and asbestos flooring that has to be abated before anything else happens.
Interior Remodels With Brand-Name Finishes
We spec KraftMaid and Wellborn cabinetry, Kohler and Moen fixtures, and Schluter waterproofing systems on the bath side. San Martin homeowners want materials they can research, not whatever is on sale at the big-box store. We quote the brand, the model, and the line item. No generic “quality materials” language.
Accessory Structures and Guest Units
Lots here are large enough that a garage conversion or standalone guest unit usually makes more sense than a dense addition. Garage conversions run $30,000 – $80,000 in San Martin. We handle the permitting through the county, the WUI review, and the construction under one contract.
Trusted Brands We Service in San Martin
San Martin projects get access to the same brand catalog we run on every Toolbox job: PGT for windows and doors, CGI for coastal-grade impact assemblies, Boral for fire-rated roofing tile and trim, and Tamko for composite roofing options. We keep our San Martin quotes specific to the brand and product line that fits the county’s requirements and your budget. That means no surprise substitutions halfway through the job.
See the difference
Before
After
Before
After
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AfterCommon General Contractor Problems We See in San Martin Homes
- Expansive clay soils cracking foundations and slab additions. Properties off Llagas and along the eastern ranch parcels sit on former orchard ground that moves seasonally. Without a geotechnical report, the county will not sign off, and the cracks show up anyway.
- Non-WUI-rated roofs and vents triggering correction notices. Santa Clara County’s fire code reaches into San Martin differently than in incorporated Morgan Hill. A non-compliant roof assembly gets flagged, and insurers have voided coverage in high-risk wildfire zones over exactly this issue.
- Buried irrigation lines and old well casings uncovered during excavation. Former orchard land hides remnants of the old ag infrastructure. We write change orders for every discovery, so you know the cost before we keep digging, and your draw schedule has the paper trail.
- Outbuildings and barns that were never permitted in the first place. When an older San Martin property changes hands, the county sometimes finds unpermitted accessory structures. We help homeowners bring them into compliance or plan their replacement without derailing the main project.
Pricing for General Contractor in San Martin, CA
San Martin is not a cheap market to build in, and the unincorporated county overlay adds real review time and documentation cost. Here are the numbers we quote most often on this side of the valley:
| Project Type | Typical Range in San Martin |
|---|---|
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Kitchen Remodel | $14,000 – $45,000 |
| Bathroom Remodel | $9,000 – $28,000 |
| Roof Replacement | $8,000 – $20,000 |
What moves the number: whether your parcel sits in the WUI zone, whether the county requires a soils report, and what condition the original structure is in. Every estimate we write is a fixed, line-item quote. Call (855) 382-3257 and we’ll walk the property, check the county requirements, and give you real numbers.
We Also Serve Cities Near San Martin
Our crews run projects throughout South Santa Clara County, so if you are in San Martin or nearby Morgan Hill, Gilroy, Amesti, or Corralitos, we are already working in your area. The county rules shift a bit from one city to the next, and we know which ones apply where.
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
A new roof in San Martin’s wildland-urban interface zones must meet Class A fire-resistance standards, which in practice means fire-rated shingles from GAF, CertainTeed, or Owens Corning, plus ember-resistant vent assemblies. The exact rating depends on your parcel’s fire hazard severity zone designation on the county map. We confirm that designation before we quote a roof, so the spec is right on the first submittal. Call (855) 382-3257 and we’ll check your parcel.
Yes, on nearly every addition we do in San Martin. The county will require a geotechnical report when the parcel sits on expansive clay soils, which covers most of the former orchard ground here. Skipping it means a failed inspection, a stopped job, and likely foundation work that has to be redone. We order the report before we pour anything, and the cost is in the estimate up front. Call (855) 382-3257 for an exact quote on your addition.
We mark and locate what we can before digging, and when the excavator hits old orchard infrastructure, we stop and write a change order before continuing. That means you approve the additional cost, you have the paper trail for the draw schedule, and nothing gets buried in the final invoice that you did not see coming. Call (855) 382-3257 if your property has old ag lines and you want to talk through the plan.
San Martin projects go through Santa Clara County’s building department rather than a city review, so the inspection sequence often includes additional fire code checks, WUI compliance review, and sometimes a site drainage review that Morgan Hill or Gilroy would not impose. We track the county’s current sequence and tell you which inspections are coming next, so you are not surprised by a correction notice. Call (855) 382-3257 to have us manage the whole permit and inspection process.
Documented compliance means you have a paper trail proving the roof assembly, vents, and siding meet the county’s fire-hardening standards at the time of construction. After a wildfire, that paperwork is what keeps an insurance claim moving when the insurer asks whether the structure was built to code. We photograph every layer, file every inspection sign-off, and hand you the record when the job closes. Call (855) 382-3257 and ask us how the documentation will look at the end of your project.
On a one-acre parcel off Llagas Road, our crew rebuilt a 1950s ranch home addition where the original foundation sat on clay-heavy former orchard soil. The county required a geotechnical report and a WUI-compliant roof assembly; we used Class A fire-rated shingles and documented every inspection sign-off so the owner could later file a wildfire insurance claim without dispute over code compliance.
Call (855) 382-3257 to schedule your free estimate in San Martin. Norm Castellano and the Toolbox Contractors team will walk your property, check the county requirements that apply to your parcel, and give you a fixed quote with real brand names and real numbers.
Written by Norm Castellano, Owner at Toolbox Contractors, serving San Martin and South Santa Clara County.