Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Before
After
Before
After
Before
AfterConstruction Services in San Martin, CA
Construction in San Martin comes with a set of rules most contractors never mention until it’s too late: county permits instead of city permits, private wells and septic systems instead of municipal hookups, and a clay soil that moves under your foundation. We work here every week and we answer the phone when you call, which matters when a county inspector wants a revision and you need answers fast. Call (877) 610-1318 and you’ll get a live person, not a voicemail box.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Why San Martin Homeowners Choose Barrett & Sons Construction
We’re Tom Barrett and our sons run the crews. We don’t dispatch strangers. When you hire us for construction in San Martin, the name on the contract is the same name on the truck that shows up at your gate. Homeowners in the Llagas Creek corridor and over near San Martin Avenue have seen us pull permits through Santa Clara County, coordinate septic and well compliance with Environmental Health, and get inspections signed without drama. Our 90-Day Done Right Promise is written on every contract: if something’s not done right, Tom comes back and makes it right with one call.
Tom Barrett publishes his name, his address, and his license number. Look it up before you sign anything. We’ve been at this since 1998, owner-operated from day one, and every price change arrives as a written change order before work happens. That’s the standard for all construction in San Martin, and we won’t drop it for anyone.
Construction Services We Offer in San Martin
Kitchen Remodeling
A San Martin kitchen often lives inside a ranch home built decades ago, with framing that doesn’t match modern cabinet dimensions. We install KraftMaid and Cambria, pull the county permit, and make sure the wall you want opened isn’t load-bearing in a way the plans didn’t catch. Learn more about our Kitchen Remodeling in San Martin.
Bathroom Remodeling
Bathrooms on well and septic systems need different plumbing considerations than city homes. We plan for your water pressure, your drain layout, and the county’s fixture count rules before we ever open a wall. We use Schluter and Sterling systems that hold up to rural moisture swings. Learn more about our Bathroom Remodeling in San Martin.
Roofing
San Martin roofs face summer heat and winter storms, and many were put on before modern underlayment existed. We install GAF and CertainTeed systems, pull permits, and walk you through what the inspector will check before we start. Learn more about our Roofing in San Martin.
Windows & Doors
The older ranch homes in the 95046 ZIP often have single-pane aluminum frames that leak heat all year. We install Andersen and Marvin windows that fit the opening properly and meet current county energy requirements. Every job gets a written quote, then a written change order if anything shifts. Learn more about our home page for the full list of what we do.
Fence Installation
Rural San Martin properties often need fencing that does double duty: keeping horses in and keeping coyotes out. We set posts deep enough for expansive soil movement and build gates that actually swing after two wet seasons. No guesswork, no wobbly corners.
Driveway & Pavers
Long rural driveways on adobe clay need a base that won’t heave apart when the ground dries out in August. We install Belgard and Techo-Bloc pavers over a compacted section that handles the valley’s wet-dry cycle. We also coordinate with the county on any frontage or drainage requirements.
Home Additions & ADU
San Martin is prime ground for attached additions and detached ADUs because the lots are big and the county’s ADU rules allow real square footage. We handle the county permitting, the septic capacity check, and the construction from foundation to final inspection. If your parcel sits near San Martin Airport, we’ll check FAA Part 77 airspace requirements before you spend money on plans.
Neighborhoods We Serve in San Martin
We work across the entire 95046 ZIP, from the large parcels north of San Martin Avenue down past the airport, and east toward the Llagas Creek corridor. Typical response time for an estimate visit in San Martin is within a couple of business days, depending on the season.
- San Martin Avenue corridor
- Llagas Creek area
- Properties near San Martin Airport (E16)
- Foothill parcels along the eastern edge
- Ranch tracts off Monterey Road
Why San Martin’s Climate & Housing Affect Construction
San Martin sits on the valley floor where Pacheco-series adobe clay runs deep under the topsoil. This clay swells when the winter rains come and shrinks when summer bakes the ground dry. A plain perimeter-slab footing is a known failure risk here, which is why we default to pier-and-grade-beam or post-tension work on additions and ADUs in San Martin. It costs more than the cheapest slab, and it’s the difference between a building that stays square and one that cracks at the corners within five years.
The same clay dictates your grading window. Once the November rains start, the soil turns to a sticky, unworkable mess that can stall foundation and site work for months. If you’re planning an addition, a barn, or a shop building in San Martin, the smart move is to have us look at the site in late summer or early fall so grading and concrete can get done before the ground turns wet. Spring and summer are for building; winter is when we file plans and wait out the mud.
Pricing for Construction in San Martin
Construction costs in San Martin run higher than the nearest city averages for a simple reason: county permitting, septic and well coordination, and clay-soil engineering all add steps that city contractors in other places never deal with. We don’t hide those steps. We write them into your quote as line items, so you see exactly what you’re paying for and why.
- Kitchen remodel in San Martin: typically $45,000-$95,000 depending on layout changes and materials
- Bathroom remodel: typically $22,000-$48,000
- Roof replacement: typically $14,000-$32,000 depending on pitch and square footage
- Windows and doors replacement: typically $850-$2,400 per opening
- Fence installation: typically $38-$75 per linear foot including materials
- Driveway and paver work: typically $14-$28 per square foot
- Home addition or ADU: typically $250-$450 per square foot, with septic upgrades quoted separately
Our published offers apply to San Martin jobs: $40 off any repair over $200, a free second opinion on any written estimate, no trip charge inside the county, and a permanent 10% Senior & Veteran discount. Call (877) 610-1318 for a line-item written estimate.
Service Area - Cities Near San Martin
Beyond San Martin, our crews serve Morgan Hill, Gilroy, Interlaken, and Watsonville. If you’re just over the county line or a few exits up 101, we can still get you a written quote and a straight answer on your project.
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 Construction in San Martin
Yes. San Martin is unincorporated Santa Clara County, so every ADU or addition permit goes through the county’s planning and building department, not a city office. We pull the permit, schedule the inspections, and make sure the final sign-off happens. If your parcel is near San Martin Airport, there may be an FAA Part 77 airspace review before the county issues anything. Call (877) 610-1318 and we’ll tell you what your specific parcel needs before you spend on plans.
Home additions in San Martin typically run $250-$450 per square foot, with well and septic upgrades quoted separately because the county must sign off on capacity before construction. We write every allowance and every price change as a written change order before work happens. Call (877) 610-1318 for an exact quote on your property; estimates are free.
Only if the scope changes, and only in writing. In San Martin, hidden conditions like undocumented septic lines or old undocumented additions can surface after demo starts, and when that happens, you get a written change order with a new price before any further work proceeds. That’s how we’ve operated since 1998. No surprise invoices at the end, ever.
Yes, on every eligible job. Tom Barrett likes the permit inspector because the inspector works for you, not for us. On any job where a permit applies, we pull it and we get the inspection signed. If a previous contractor told you permits were optional, that’s exactly the kind of job we get called to fix.
It depends on the county’s review calendar, which runs slower during the fall and winter, and on the weather window for grading and concrete. A kitchen remodel typically runs 6-10 weeks from demolition to final inspection. An addition or ADU typically runs 4-8 months including county review periods. We’ll give you a written schedule at the estimate and update it as county steps clear. Call (877) 610-1318 to get your project on the calendar.
Contact Barrett & Sons Construction in San Martin
If you’re planning construction in San Martin, start with a real conversation. We’ll send one of our crews to walk your property, look at your well and septic setup, check the soil at your building site, and talk through what the county will ask for. No high-pressure pitch and no mystery numbers. Just a written estimate and a straight answer.
Call (877) 610-1318 to schedule your free estimate in San Martin. A live person answers the phone 24/7, and Tom Barrett stands behind every job with the written 90-Day Done Right Promise.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving San Martin, CA since 1998.
What happens when you call
- 1A real person answersNo phone trees - talk to a local construction pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What San Martin Customers Say
"Tom Barrett was on our job most days himself, not just at the quote and then never again. When something needed deciding there was an actual person to decide it with."
- Rosalie Pemberton"Came back a year later to sort a door that had dropped as the frame settled. No charge and no argument about whether it was covered."
- Thaddeus Oyelowo"Addition over the garage matched the original roofline and brickwork so closely that visitors do not realise it was added. He tracked down the closest brick he could find rather than settling."
- Gideon Stroud