Bathroom Remodeling in San Martin, CA
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Bathrooms for Rural and Estate Homes
San Martin is a rural community of about 5.5 square miles between Morgan Hill and Gilroy, from the small-lot core around Monterey Road and San Martin Avenue to the Hayes Lane estates and the CordeValle golf community. Bathroom projects here range from updating farmhouse baths to building large primary suites.
Bathroom Projects
Adding a Bathroom? Check the Septic First
Remodeling an existing bathroom in place is a County building permit. Adding a bathroom or bedroom can change septic requirements, because San Martin drainfields are sized by percolation rate and number of bedrooms.
Septic and wells: most of San Martin has no public water or sewer. County Environmental Health reviews onsite wastewater (septic) systems for new homes, ADUs and both major and minor additions. Drainfields are sized by soil percolation rate and number of bedrooms, and connecting a structure to an existing system requires a pumper report and a 30-minute water test. The San Martin plan prohibits new septic systems in the highly permeable soils along Llagas Creek. Most homes use private or shared wells; the San Martin County Water District serves part of the area east of Monterey Road, and California American Water acquired West San Martin Water Works in 2025.
County Permits
Department of Planning and Development
70 W. Hedding Street, East Wing, 7th Floor, San Jose, CA 95110 · (408) 299-5700
Monday to Thursday 8 a.m. to noon and 1 to 5 p.m.; Fridays limited building services for active permits. Applications go through the County Public Permit Portal. Environmental Health, Roads and Fire Marshal staff are at the permit center on Tuesdays and Thursdays.
County inspections: book through the VuSpex virtual inspection app, the Public Permit Portal or (408) 299-5700; requests before 3 p.m. on a workday get a next-day inspection. Fire Marshal inspections: (408) 341-4420. Request a final inspection on every related permit to close out the project.
Explore More
Other San Martin services: ADUs · Kitchens · Additions · New Homes · San Martin overview
Same service nearby: Morgan Hill · Gilroy
See our bathroom remodeling page.
San Martin Bathroom Remodeling FAQ
Who issues bathroom permits in San Martin?
Santa Clara County Department of Planning and Development.
Does adding a bathroom affect my septic system?
It can. Septic systems are sized by bedrooms and soil, and Environmental Health reviews additions.
How do I get an inspection?
Through VuSpex, the Public Permit Portal or (408) 299-5700, before 3 p.m. for next-day service.
How long does a bathroom remodel take?
A few weeks of construction after materials arrive.