Unincorporated San Benito County, California requires a building permit for new construction and has its own zoning, with the city of Hollister setting its own zoning inside city limits123. The county's Resource Management Agency issues building permits and administers zoning, while county Environmental Health permits septic systems456. Rural districts carry real minimums: Agricultural Rangeland requires 40 acres per lot7.
At a glance
- Building permit
- Required, issued by the Resource Management Agency's Building Division1
- Zoning
- Yes, countywide in the unincorporated area with AR, AP, R, RT, RR, R-1 and RM districts289
- Minimum lot size
- 40 acres in Agricultural Rangeland, down to 2.5 acres in Rural Transition, and as small as half an acre in some residential districts7
- Septic
- County-issued by Environmental Health; a new system permit runs $85510611
- Owner-builder
- Allowed with a signed owner-builder declaration; you become the responsible party of record1213
- Tiny home
- Allowed outside Hollister as a primary home or ADU, 150 to 400 square feet, meeting a detailed county checklist14
- RV living
- Temporary low-impact camping only (14 nights) in AR, AP, R, RR and RT zones; permanent RV living only in qualifying farmworker housing1516
- Wells
- Permitted through the San Benito County Water District17
Who to call
Building permits
San Benito County Resource Management Agency — Building & Code Enforcement Division
Building permit applications, plan review and inspections for unincorporated San Benito County
2301 Technology Parkway, Hollister, CA 95023
Zoning
San Benito County Resource Management Agency — Planning Division
Zoning applications, variances and subdivision review for unincorporated San Benito County
2301 Technology Parkway, Hollister, CA 95023
Septic permits
San Benito County Environmental Health
Onsite wastewater treatment system (septic) permits, site evaluations and inspections for San Benito County
environmentalhealth@sanbenitocountyca.gov
351 Tres Pinos Rd. C-1, Hollister, CA 95023
Well permits
San Benito County Water District
New and modified well permits and groundwater-protection standards in San Benito County
30 Mansfield Road, Hollister, CA 95023
Contact details are copied from each office’s official page and were checked against it on October 16, 2026.
Off-grid gear
Going off-grid in San Benito County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in San Benito County, California?
San Benito County, California requires a building permit before you build, add onto, alter, move or demolish most structures in the unincorporated county1. The Resource Management Agency's Building Division reviews plans and issues permits under the California Building Code, the International Code Council's model codes and the National Electric Code4. California's own permit statute puts it plainly: no building or structure may be erected, altered, repaired, moved or demolished without a separate permit from the local building official18. San Benito County's own code adopts the 2022 California building, residential and fire codes by reference with local amendments, and we could not confirm a county ordinance adopting the newer 2025 edition, so ask the Building Division which edition applies to your application19. If you remodel, repair or enlarge more than 50% of an existing structure, the county treats the whole structure as new and requires it to meet current code, with added fees20. Inside Hollister, the city runs its own zoning, and the county's rules here cover only unincorporated land3. Owner-builders may pull the permit themselves by signing an owner-builder declaration and becoming the responsible party of record1213.
Who is the San Benito County building department and how do you reach them?
San Benito County's Resource Management Agency (RMA) issues building permits and reviews plans through its Building and Code Enforcement Division4. RMA brings together planning, building, code compliance and public works at 2301 Technology Parkway in Hollister4. The same office and phone line handle the Planning Division, which reviews zoning applications, variances and subdivision maps for the unincorporated county21. The county's Building Permit Application and related forms are posted online, but the page does not lay out the full review, payment and inspection sequence, so ask the Building Division what to expect after you apply22.
Does San Benito County have zoning?
San Benito County zones the entire unincorporated county: every parcel has a base zone, and specific-plan or combining zones can modify the rules28. Districts include Agricultural Rangeland (AR), Agricultural Productive (AP), Rural (R), Rural Transition (RT), Rural Residential (RR), single-family Residential (R-1) and Multifamily Residential (RM)9. Minimum lot sizes are large in the rural zones: 40 acres in AR, 5 acres in AP and R, and 2.5 acres in RT; RR runs 0.5 to 1 acre depending on public sewer and water, and R-1 needs 5,000 square feet, 1 acre or 2.5 acres depending on services, with septic on a well pushing it to 2.5 acres7. Height is capped at 35 feet in AR, AP, R, RT, RR and RM, and 30 feet in R-123. Front setbacks are 30 feet in AR, 25 feet in AP, R, RT and RR, and 20 feet in R-1 and RM; interior side setbacks are 32 feet and rear setbacks 35 feet in the four rural districts24. Residential lot coverage tops out at 40% in RR and R-1 and 60% in RM25. Inside Hollister, the city adopts its own zoning ordinance, which it is currently overhauling, so a mailing address alone will not tell you which rulebook applies326.
How do septic permits work in San Benito County?
Septic systems — formally onsite wastewater treatment systems, or OWTS — fall under San Benito County Environmental Health, which permits new systems, repairs, engineered systems, commercial systems, alternative or innovative systems, and system abandonment1011. Fees are non-refundable and vary by system type: $855 for a new system or major repair, $445 for a minor repair, $980 for an engineered individual system, $1,100 for a commercial system, $2,148 for an alternative or innovative system, and $151 to abandon an old system11. You will need an accurate plot plan showing the system and its 100% expansion area, and you must notify Environmental Health with your installer's name and license number before work begins11. California's statewide OWTS policy sets minimum standards through the State Water Board and regional water boards, but San Benito County Environmental Health administers the permit locally, and its local rules must stay consistent with that statewide policy27. We could not confirm from an official county source whether a separate final inspection is required before a system can be covered, so ask Environmental Health directly when you apply5.
Can you live in an RV or tiny home on your land in San Benito County?
San Benito County allows a tiny home on wheels as a primary residence or accessory dwelling unit on unincorporated land outside Hollister city limits, as long as the zoning district allows a residential dwelling or ADU and the unit meets the county's detailed standards14. Those standards are specific: the tiny home must run between 150 and 400 gross square feet, sit on a paved parking pad with its wheels and undercarriage hidden behind a solid apron, connect to approved water and sewer utilities, and meet either ANSI 119.5 or NFPA 119214. A tiny home on wheels can be towed at up to 14 feet tall, though a home placed permanently on a lot may exceed that height if it still meets local roadway limits14. An ordinary RV is a different case: California generally limits RV occupancy to mobile home parks or special occupancy parks unless a local ordinance says otherwise28. San Benito County's own ordinance allows low-impact camping, including dry RV camping, only in the AR, AP, R, RR and RT zones, and it is temporary only: the sleeping accommodation may not be used for permanent human occupancy, and no camper may stay more than 14 consecutive nights15. The county allows permanent RV occupancy only in a qualifying rural farmworker housing project of at least five farmworkers, with a county license and permits16. We found no county rule letting an owner live full time in a single RV on raw land, so confirm with the Resource Management Agency's Planning Division before you try21. A detached accessory dwelling unit, up to 1,500 square feet, has no minimum size beyond the building code's efficiency-unit standard and needs Environmental Health clearance for water and wastewater29.
How do you build a home in San Benito County, step by step?
- Confirm your parcel's zoning district and minimum lot size with the Resource Management Agency's Planning Division before you buy — San Benito County's rural districts require anywhere from 2.5 to 40 acres depending on the zone217.
- If you are dividing or combining parcels, get your map reviewed under the county's Subdivision Map Act ordinance before you record anything3031.
- Apply for your septic permit with San Benito County Environmental Health and budget for the system-specific fee, from $151 for an abandonment to $2,148 for an alternative or innovative system511.
- If you need a new or modified well, apply through the San Benito County Water District, which coordinates with Environmental Health on groundwater-protection standards3217.
- Submit your building permit application to the Resource Management Agency's Building Division along with your site plan, and expect published engineering and planning fees on top of the permit itself, such as $255 for a C-District review of an existing building or $523 for new construction433.
- If you are putting an agricultural building on a parcel larger than 5 acres, ask the Planning Department about the impact-fee exemption when you file the building permit application; the exemption does not waive the permit itself, and projects that miss it can ask the Board of Supervisors for a reduction, deferral or waiver34.
What should you check before buying land in San Benito County?
San Benito County's nearest metro-scale city is about 36 miles from the county's center, so factor real drive time into daily life if you are not near Hollister35. Land here is not cheap relative to its rural feel: farmland recently priced around $5,362 an acre, and the typical home value is about $771,210, among the higher figures in this county-guide series3637. Water is the county's biggest swing factor — it gets only about 17 inches of rain a year and has been in severe drought roughly 37% of years on record, and any new or modified well needs a San Benito County Water District permit383932. Septic siting deserves real scrutiny here: only about 6% of the county's soil is rated free of severe limits for a conventional drain field, so plan on an engineered or alternative system being the norm rather than the exception, and budget accordingly40. Only about 20% of the county's land sits at 15% slope or less, so a lot of San Benito County is hillier than it looks on a map, and grading and access costs can add up fast41. Property taxes run a typical effective rate around 0.8%, with a median bill near $6,078 a year, reflecting the county's high home values4243.
Watch-outs
- San Benito County's zoning ordinance applies only outside Hollister city limits; the city of Hollister runs its own separate zoning ordinance that it is currently overhauling, so confirm which jurisdiction actually covers your parcel26.
- Driveways onto a State highway need a Caltrans encroachment permit, and we could not confirm San Benito County's own driveway or encroachment permit process, so ask the Resource Management Agency before you plan a new access point444.
- Only about 6% of San Benito County's soil is rated free of severe limits for a conventional septic drain field, so budget for a site evaluation and likely an engineered or alternative system before you commit to a building site40.
- We could not confirm a minimum dwelling size for a primary home in unincorporated San Benito County; only detached accessory dwelling units are stated to have no minimum beyond the efficiency-unit standard, so ask the Resource Management Agency's Planning Division before you design a small home2921.
- The county's building codes cite the 2022 California edition, and we could not confirm a county ordinance adopting the 2025 edition, so ask the Building Division which applies to your application19.
- Residential developments subject to the county's inclusionary-housing in-lieu fees must pay them in full before a certificate of occupancy and final inspection45.
Sources
- codelibrary.amlegal.com (2026 county census)
- 25.03: Zoning Map and Zoning Districts (2026 county census)
- Hollister: Hollister Municipal Code 17.04.030 Residential general development standards (San Benito County), quoted and re-checked
- San Benito County Resource Management Agency — Building & Code Enforcement Division (sanbenitocountyca.gov)
- San Benito County Environmental Health (hhsa.sanbenitocountyca.gov)
- Environmental Health – San Benito County Health and Human Services Agency, quoted and re-checked
- § 25.03.004 Agricultural and Rural Districts, quoted and re-checked
- 25.03: Zoning Map and Zoning Districts, quoted and re-checked
- 25.03: Zoning Map and Zoning Districts, quoted and re-checked
- Environmental Health – San Benito County Health and Human Services Agency (2026 county census)
- Sewage Disposal System Permit Application, quoted and re-checked
- Application for Building Permit — Owner Builder Declaration (2026 county census)
- Application for Building Permit — Owner Builder Declaration, quoted and re-checked
- Tiny Home on Wheels Permit Checklist, quoted and re-checked
- § 25.08.031 Low Impact Camping, quoted and re-checked
- § 25.08.022 Agricultural Employee (Farmworker) Housing, quoted and re-checked
- San Benito County Drought Resilience Plan, quoted and re-checked
- Do I need a building permit for my project? (California statewide rule), quoted and re-checked
- § 21.01.021 Adoption of 2022 California Building Codes, International and Uniform Codes, quoted and re-checked
- codelibrary.amlegal.com, quoted and re-checked
- San Benito County Resource Management Agency — Planning Division (sanbenitocountyca.gov)
- Application, quoted and re-checked
- § 25.03.004 Agricultural and Rural Districts, quoted and re-checked
- § 25.03.004 Agricultural and Rural Districts, quoted and re-checked
- § 25.03.005 Residential Districts, quoted and re-checked
- 25.03: Zoning Map and Zoning Districts, quoted and re-checked
- Water Quality Control Policy for Siting, Design, Operation and Maintenance of Onsite Wastewater Treatment Systems (OWTS Policy) (California statewide rule), quoted and re-checked
- hcd.ca.gov (California statewide rule), quoted and re-checked
- § 25.08.002 Accessory Dwelling Units and Innovative Housing, quoted and re-checked
- § 23.25.002 Subdivisions; Minimum Parcel Size Less Than Five Acres, quoted and re-checked
- California Government Code Section 66424 (California statewide rule), quoted and re-checked
- San Benito County Water District (sbcwd.com)
- Engineering Fees, quoted and re-checked
- § 21.01.111 Exemption Requirements, quoted and re-checked
- Straight-line distance from the county center to the nearest city of 100,000+ people: Bolthole Index county data
- Farmland value per acre (USDA census): Bolthole Index county data
- Typical home value (Zillow): Bolthole Index county data
- Annual precipitation: Bolthole Index county data
- Share of years in severe drought: Bolthole Index county data
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
- Share of land at 15% slope or less: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
- Encroachment Permits | Caltrans (California statewide rule), quoted and re-checked
- § 21.03.008 In-lieu payment and other alternative compliance mechanisms, quoted and re-checked
Written October 16, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.