Bolthole Index

Santa Clara County, California

Zoning, building permits and septic rules in San Jose, California

San Jose, California (Santa Clara County) sets its own zoning inside city limits, and the city's Building Division issues building permits for private property.12 Santa Clara County's building permit and zoning rules cover unincorporated land only, so they do not apply to a San Jose address.3 Septic is a separate question: the county Department of Environmental Health permits septic systems county-wide, but we could not confirm it handles addresses inside San Jose, where cesspools are barred wherever the street sewer is practicable.45

At a glance

Building permits
Issued by the City of San Jose Building Division; apply through sjpermits.org2
Zoning
City zoning districts, from OS and A through R-1, R-2, R-M and R-MH6
Height in OS and A districts
35 feet, unless Chapter 20.85 sets another maximum7
Building code
2025 California Residential Code with San Jose amendments8
Cesspools
Barred where connection to the street sewer is practicable5
Junior ADUs
Allowed on single-family lots under state law9
Owner-builder (state law)
Exempt from contractor licensing; permits and inspections still apply10

Who to call

Building permits

City of San Jose Building Division (Planning, Building & Code Enforcement)

Building permits, plan review and inspections for private property inside San Jose city limits

408-535-3555

[email protected]

200 E. Santa Clara St. - Tower, 2nd Floor San José, CA 95113

Online permits →

Planning & zoning

City of San Jose Planning Division (Planning, Building & Code Enforcement)

Zoning questions and planning permits inside San Jose city limits

408-535-3555

[email protected]

200 E. Santa Clara St. Tower, 3rd Floor San José, CA 95113

Online permits →

Septic permits

Santa Clara County Department of Environmental Health (onsite wastewater)

Septic (onsite wastewater treatment system) permits and installation inspections in Santa Clara County; ask whether it covers a given San Jose address

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Off-grid gear

Going off-grid in San Jose means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in San Jose, California?

Yes for building work on private property inside San Jose city limits. The Building Division describes its job as ensuring the safety of buildings on private property by applying California's current building codes to project review and inspection, and it lists the kinds of projects that are subject to a building permit on its building bulletins page.2

Residential construction follows the California Residential Code, 2025 edition, with Title 24 and San Jose amendments.8 Santa Clara County's requirement that construction needs a county building permit applies to unincorporated areas, not to San Jose.3

California's owner-builder exemption covers contractor licensing only, and an owner-builder must still pull all building permits and pass inspections.10 We could not confirm a San Jose-specific owner-builder rule, the permit fee schedule or an agricultural exemption; ask the Building Division.

Who issues building permits in San Jose, and how do you reach them?

The City of San Jose Building Division, part of Planning, Building & Code Enforcement, issues building permits at City Hall. Call 408-535-3555 or email [email protected]; permit status, fees and inspections are handled at sjpermits.org.2

For zoning and planning permits, email [email protected] or call 408-535-3555 and press 1.11

Do not send a San Jose address to the Santa Clara County Department of Planning and Development, which issues building permits for unincorporated land only.3

Does San Jose have zoning, and what does it mean for lot size and height?

Yes. San Jose adopts and administers its own zoning districts, which regulate the location, height and size of buildings and the yards and setbacks around them.1 The code lists districts including OS Open Space, A Agricultural, R-1-RR, R-1-1, R-1-2, R-1-5, R-1-8, R-2, R-M and R-MH, plus commercial, mixed-use, industrial and special districts.6

In the OS and A districts the maximum height is 35 feet unless Chapter 20.85 sets an alternative.7 We could not confirm minimum lot size, lot coverage or minimum dwelling size for the main residential districts, so ask the Planning Division which district your parcel is in and what applies.11

Junior accessory dwelling units on single-family lots are approved under state law provisions.9

How do septic permits work in San Jose?

Santa Clara County's Department of Environmental Health issues permits for new septic systems and repairs, and a permit is required before construction, with Environmental Health clearance needed before a building permit for new development.412 We could not confirm that the county, rather than the city, handles septic inside San Jose limits; ask Environmental Health and the Building Division.13

Inside the city, no privy vault, cesspool or similar sewage reservoir may be maintained where connection to the street sewer is practicable.5 Where no sewer is practicable, expect a site evaluation: only 1% of soils in Santa Clara County rate as not very limited for a conventional drain field.14

Wells in the Santa Clara Valley Water District service area need a Valley Water permit before drilling.15

Can you live in an RV or tiny home in San Jose?

We could not confirm a city rule for living in an RV or tiny home on private land in San Jose, and the county's RV rules apply to unincorporated land only.16 California generally limits RV occupancy to mobilehome parks and special occupancy parks unless a local ordinance allows otherwise.17 A tiny home must be approved as a manufactured home, code-compliant house, factory-built housing, RV, park trailer or camping cabin before anyone lives in it.18 Ask the Planning Division how the city classifies yours.11

Building a home in San Jose: the steps, in order

  1. Ask the Planning Division which zoning district applies and whether your project needs a planning permit.11
  2. Confirm sewer service for the lot; if sewer is not practicable, contact County Environmental Health about a septic permit.513
  3. Apply for the building permit through the Building Division and sjpermits.org; single-family and duplex applicants who struggle with the online process can call 408-535-3555 for an in-person appointment at the permit center.2
  4. Pay fees and schedule inspections at sjpermits.org.2

Watch-outs

  • Santa Clara County's unincorporated-area building, zoning and RV rules do not apply inside San Jose city limits.3
  • Permitting customers in Bay Area cities have been targeted by scammers posing as municipalities; check invoices at sjpermits.org before paying.2
  • We could not confirm septic authority, private well rules, floodplain development permits, short-term rental rules or subdivision requirements inside the city; start with the Planning Division.11

Sources

  1. San José Municipal Code § 20.10.060, Zoning districts established (San Jose), quoted and re-checked
  2. City of San Jose Building Division (Planning, Building & Code Enforcement) (sanjoseca.gov)
  3. Apply for a Building Permit, quoted and re-checked
  4. Onsite Wastewater Treatment System (OWTS), quoted and re-checked
  5. San José Municipal Code § 9.36.130, Privies and cesspools prohibited (San Jose), quoted and re-checked
  6. San José Municipal Code § 20.10.060, Zoning districts established (San Jose), quoted and re-checked
  7. San José Municipal Code § 20.20.200, Development standards (San Jose), quoted and re-checked
  8. San José Municipal Code § 24.01.265, Residential code (San Jose), quoted and re-checked
  9. San José Municipal Code § 20.80.178, Junior accessory dwelling units (San Jose), quoted and re-checked
  10. California Business and Professions Code Section 7044, quoted and re-checked
  11. City of San Jose Planning Division (Planning, Building & Code Enforcement) (sanjoseca.gov)
  12. Other approvals that may be needed for construction, quoted and re-checked
  13. Santa Clara County Department of Environmental Health (onsite wastewater) (deh.santaclaracounty.gov)
  14. 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
  15. Well Permits and Inspections, quoted and re-checked
  16. plandev.santaclaracounty.gov, quoted and re-checked
  17. hcd.ca.gov (California statewide rule), quoted and re-checked
  18. Information Bulletin 2016-01: Tiny Homes (California statewide rule), quoted and re-checked

Written October 10, 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.

Answers from the rulebook for San Jose

San Jose’s own rules

  • Building code adoptedAdopted

    Residential construction inside San José city limits.

    • The city code incorporates the California Residential Code, 2025 edition, with Title 24 and San José Title 24 amendments.
    “"Residential code" means the California Residential Code, or CRC, 2025 edition, based on 2024 International Residential Code promulgated by the International Code Council, including the appendix thereto, together with those omissions, amendments, exceptions and additions thereto as amended in Title 24 of the California Code of Regulations and in this title.”
  • InspectionsLimited

    Nonresidential projects seeking temporary occupancy inside San José city limits.

    • Final inspections must be attempted before a TCO application.
    • If the TCO expires without resolution, occupancy must cease until a renewed TCO or final Certificate of Occupancy is obtained.
    “All required final inspections must have been attempted, although not necessarily passed, before you can apply for temporary occupancy.”
  • Certificate of occupancyLimited

    Temporary or partial occupancy of nonresidential buildings inside San José city limits.

    • A TCO may be granted only if the Inspection Services Division Manager finds that no substantial hazard will result.
    • Each request is evaluated case by case.
    • If the TCO expires before compliance, the premises must be vacated until a renewed TCO or final Certificate of Occupancy is obtained.

    TCO processing fee: 630 USD (An additional $884 Fire Department review fee applies if there is no Fire Department Final.)

    “A Temporary Certificate of Occupancy (TCO) enables occupancy or partial occupancy of a building before the building project is completed. A TCO may be granted for a reasonable timeframe if the Inspection Services Division Manager finds that no substantial hazard will result from such occupancy. Each TCO request is evaluated on a case-by-case basis.”
  • Local zoningPresent

    Land inside San José city limits; the city establishes and administers zoning districts.

    “In order to regulate and restrict the location of residences, professions, businesses, trades, and industries, to regulate and restrict the location, height, and size of buildings and structures hereafter erected, enlarged or altered, and to regulate and determine the area, depth, and width of yards, setback areas, and other open spaces, the following classes of city zoning districts are hereby established, as set forth in Table 20-10:”
  • Zoning districtsPublished

    Zoning districts inside San José city limits, including OS, A, R-1-RR, R-1-1, R-1-2, R-1-5, R-1-8, R-2, R-M, R-MH, commercial, mixed-use, industrial, and special districts listed in the code.

    • Special zoning districts are limited to specific geographic areas as stated in the code.
    “Table 20-10 City Zoning Districts Zoning District Zoning Map Symbol Alternative Zoning Map Symbol OS Open Space OS OS A Agricultural A A”
  • Building heightDistrict specific (with conditions)

    OS Open Space and A Agricultural zoning districts inside San José city limits.

    • An alternative maximum height may be established under Chapter 20.85; where established, that Chapter 20.85 regulation governs and controls.

    maximum height: <= 35 feet (Alternative maximum height under Chapter 20.85.)

    “Maximum Height (Note 1) 35 or established in Chapter 20.85 35 or established in Chapter 20.85”
  • Accessory dwellingsAllowed (with conditions)

    Junior accessory dwelling units on lots with single-family dwellings inside San José city limits.

    • JADUs must comply with California state-law provisions as amended.
    • An ADU is an attached or detached ancillary residential dwelling with complete independent living facilities on the same parcel as the primary dwelling.
    “Pursuant to Section 66333 of the Government Code, or as amended, this Section provides for the streamlined approval of Junior Accessory Dwelling Units. Notwithstanding any other provision of this Title to the contrary, Junior Accessory Dwelling Units, for lots consisting of single-family dwellings, shall comply with State law provisions, as may be amended.”
  • Off-grid sanitationProhibited

    Privy vaults, cesspools, and specified sewage reservoirs on premises inside San José city limits where connection to the street sewer is practicable.

    • Exception applies as provided in San José Municipal Code § 9.36.120.
    “No privy vault, cesspool or reservoir into which any privy, water closet, toilet, stable, sink or other receptacle of sewage or liquid refuse is drained, shall be maintained upon any premises within the city where connection to the street sewer is practicable, except as provided in Section 9.36.120.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask San Jose or Santa Clara County directly.

  • Owner-builder exemption — Owner-builder permitting inside San José city limits.
  • Minimum dwelling size — Minimum dwelling size inside San José city limits.
  • Lot coverage — Lot coverage inside San José city limits.
  • Living in an RV — Long-term or residential recreational-vehicle occupancy on private land inside San José city limits.
  • Camping on your land — Temporary camping on private land inside San José city limits.
11 more unanswered
  • Manufactured homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • Building in a floodplain
  • Short-term rentals
  • Permit fees
  • Permit process

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that San Jose publishes no rule on the point, not that none exists. Santa Clara County’s page lists the county offices to call.

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