Kern County, CA Building Permits, Zoning & Septic Rules

Unincorporated Kern County, California requires a building permit for construction, alteration or repair under the adopted California Building Standards Code, issued by the county's Public Works Building Inspection Division¹. The county's own Zoning Ordinance, Chapter 19 of the Code of Ordinances, governs land use throughout the unincorporated county, but excludes every incorporated city — Bakersfield included²³. Septic systems go through the Kern County Environmental Health Division under the state's OWTS Policy, and about 19.3% of the county's soils are free of severe limits for a conventional drain field⁴⁵.

At a glance

Building permit: Required in unincorporated Kern County; issued by Public Works Building Inspection¹
Zoning: Countywide Zoning Ordinance (Chapter 19) for unincorporated land only; cities are excluded²³
Septic: Permitted by the county's Environmental Health Division, consistent with the state OWTS Policy⁴
Owner-builder: Yes — Kern County provides an owner-builder declaration form for permit applicants building on their own property⁶
Minimum lot size: Set per zoning district; a zone modification can reduce it by up to 15%, more needs a variance⁷
Manufactured/mobile home: Allowed outside parks with conditions: DMV/foundation registration, HCD insignia, 5-ft property-line setback⁸
Tiny home / ADU: Allowed statewide if it meets the ADU definition or an approved classification (manufactured home, RV, etc.)⁹¹⁰

Who to call

Building permits

Kern County Public Works Department — Building Inspection Division

Residential and commercial building permits and inspections for unincorporated Kern County

(661) 862-5100

Public Services Building, 2700 "M" Street, Suite 400, Bakersfield, CA 93301

Zoning

Kern County Planning & Natural Resources Department

Zoning determinations, zone changes/variances, and the Zoning Ordinance (Title 19) for unincorporated Kern County

661-862-5263

[email protected]

Online permits →

Septic permits

Kern County Public Health Services Department — Environmental Health Division

Onsite wastewater treatment system (septic) construction, reconstruction and repair permits for Kern County

(661) 321-3000

1800 Mt. Vernon Avenue, Bakersfield, CA

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

Do you need a building permit in Kern County, California?

Yes, in unincorporated Kern County. The county's Public Works Building Inspection Division requires a permit for erection, construction, enlargement, alteration or repair of buildings under the adopted California Building Standards Code (county Title 17)¹. California law requires that same separate-permit-per-structure rule statewide, so this isn't unique to Kern County — every city and county building department works the same way¹¹. If your parcel sits in a wildland-urban interface area, a separate permit is required for each building or structure regulated by the county's Wildland Urban Interface Code, subject to its own listed exemptions¹². You can build on your own property without a licensed contractor using the county's owner-builder declaration, reflecting the state's Business and Professions Code 7044 exemption, but you'll still need the same building, electrical and plumbing permits⁶.

Who is the Kern County building department, and how do you reach them?

Kern County Public Works' Building Inspection Division issues building permits and performs inspections for unincorporated Kern County; reach them at the Public Services Building, 2700 "M" Street, Suite 400, Bakersfield, CA 93301, phone (661) 862-5100¹³. California law puts this duty on the county: every county building department must enforce the State Building Standards Code within its own jurisdiction, which is why Bakersfield city permits and Kern County unincorporated permits come from two different offices¹⁴. For zoning questions specifically — what you can build where — the Kern County Planning & Natural Resources Department is the right call instead, at 661-862-5263 or [email protected]¹⁵.

Does Kern County have zoning?

Yes, but only for unincorporated land: the Kern County Zoning Ordinance, Chapter 19 of the Code of Ordinances, regulates land use throughout the unincorporated county and explicitly excludes every incorporated city²³. That means a parcel just outside Bakersfield's city limits and one just inside it can be governed by entirely different rules, even though both show up as "Kern County" on a map¹⁶. Base zoning districts regulate a wide range of uses, and a single-family home is allowed by right in residential districts, with the detailed development standards for each district available from the Planning Department¹⁷. Minimum lot sizes are set per zoning district rather than countywide; a zone modification can shrink a lot size by up to 15%, and anything beyond that needs a full variance with filing fees, a plot plan and property-owner approval⁷.

How do septic permits work in Kern County?

Kern County's Environmental Health Division, part of the Public Health Services Department, permits septic systems, consistent with the State Water Board's OWTS (onsite wastewater treatment system) Policy⁴. Statewide, California lets counties run these programs directly as long as local permitting stays consistent with that statewide policy, which is exactly Kern County's setup¹⁸. Soils here are moderate by California standards: about 19.3% of Kern County's soils are free of severe limits for a conventional drain field, meaning plenty of rural parcels can still support a standard system, but a site evaluation before you buy is the only way to know which side of that line your lot falls on⁵. Reach Environmental Health at (661) 321-3000 or 1800 Mt. Vernon Avenue, Bakersfield¹⁹.

Can you live in an RV or tiny home on your land in Kern County?

Not simply by parking an RV on a vacant lot. California treats RVs as temporary lodging, not permanent dwellings, and generally limits RV occupancy to mobilehome parks or special occupancy parks unless a local ordinance says otherwise — and no Kern County ordinance allowing broader RV occupancy was found in the official materials reviewed for this guide²⁰. A tiny home can be occupied in California only if it's approved as one of several defined structure types — a manufactured home, a California Building Code home, factory-built housing, an RV, a park trailer or a camping cabin — and it's illegal to occupy if it doesn't fit one of those categories⁹. A manufactured or mobile home can go on unincorporated Kern County land outside a park, but it must carry a valid vehicle license or go on a permitted foundation and the county tax rolls, carry an HCD insignia, sit at least 5 feet from any property line, and stay to one per parcel unless a second is for an immediate family member living there rent-free⁸. A tiny home built to ADU standards gets ministerial, no-hearing approval under state law, but every local site, building, health, safety and fire requirement still applies, so check with Kern County Planning before you assume you can add one¹⁰.

Building a home in Kern County: the steps, in order

Confirm your parcel's zoning district and minimum lot size with Kern County Planning & Natural Resources before you design anything²⁷.
If you're not on public sewer, get a soil evaluation and apply for your septic permit through the county's Environmental Health Division⁴.
If you need a well, check with the county's local well ordinance enforcement, since California leaves well permitting to local agencies operating under state minimum standards²¹.
Check whether your parcel is in a wildland-urban interface area, since that triggers the county's separate WUI Code permit requirements¹².
Apply for your building permit through Public Works' Building Inspection Division, using the owner-builder declaration if you're building it yourself¹⁶.
If you're dividing the parcel from a larger tract, get your parcel or tentative map approved under the Subdivision Map Act before you can record or sell the new lot²².

What to check before you buy land in Kern County

Septic and soils: about 19.3% of Kern County's soils are free of severe limits for a conventional drain field, so get a site evaluation before you assume any given parcel will pass⁵. Water: outside public-water areas, expect a private well permitted under Kern County's local well ordinance rather than one uniform state process²¹. Fire and climate: Kern County saw severe drought in about 41.5% of recent years and is projected to average roughly 41.6 days a year at or above 100°F by mid-century, so ask whether your specific parcel sits in a wildland-urban interface zone with its own permit rules²³²⁴¹². Federal land: about 31% of Kern County is federal land, which shapes what's actually available to buy in some parts of the county²⁵. Taxes: the effective property tax rate runs about 0.9%, with a median annual bill near $2,833²⁶²⁷. Context: this is a low-density county at about 112 people per square mile, roughly 18 miles from the nearest metro area, genuinely rural once you're off the main corridors²⁸²⁹.

Watch-outs

Kern County's own zoning ordinance and building-regulations documents were only partly accessible during research; minimum dwelling size, lot-coverage standards and any agricultural building exemption were not confirmed for unincorporated Kern County, so verify each directly with Planning & Natural Resources for your specific district before you rely on an assumption¹⁷.
The wildland-urban interface building-permit requirement applies district by district, not countywide; confirm with Public Works whether your specific parcel is inside a designated WUI area before assuming standard permit rules apply¹².
Placing a second mobile home on a parcel outside a mobile home park is not a general right in unincorporated Kern County — it requires zoning authorization and written proof the second occupant is an immediate family member paying no rent⁸.

Sources

Written September 24, 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.

How Kern County scores

Seclusion44100% ev.

Self-Sufficiency13100% ev.

Admin Boringness40100% ev.

Durability37100% ev.

Property Autonomy56100% ev.

Carry Cost57100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$366kTypical home

0.9%Property tax

$10,539Land / acre

8.9"Annual rain

41.5% of yrsSevere drought

41.6 / yr (+19.7)Mid-century 100°F days

110.3 daysMid-century dry spell

0.94" (+4%)Mid-century 1-day rain

1.1×Wildfire change factor

100%Forward climate coverage

$1,203Home insurance / yr

4.3% / yrInsurance growth

1.21%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

1,363,703People within 2 hr

26,686Radius comparison (15 mi)

112.3People / sq mi

31%Federal land

48.1%Land at 15% slope or less

19.3%Septic soil without severe limits

949,333 acWorkable land screen

15.8%Wooded land

25.4 tonsBiomass / forest ac

62.3°FAvg temp

Answers from the rulebook for Kern County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Kern County rules

Building permitLimited
Buildings and structures regulated by the Kern County Wildland Urban Interface Code in unincorporated Kern County
- The requirement applies within a wildland-urban interface area regulated by the Kern County Wildland Urban Interface Code.
- The code states the requirement is subject to listed exemptions.
- A separate permit is required for each building or structure.
“Section 107.2 Permits required. Unless otherwise exempted, no building or structure regulated by this code shall be erected, constructed, altered, repaired, moved, removed, converted, or demolished unless a separate permit for each building or structure has first been obtained from the building official.”
Kern County Code of Building Regulations — Complete PDF ↗Re-checked Sep 24, 2026
InspectionsLimited
Gypsum board installations regulated by the Kern County Building Code in unincorporated Kern County
- The code summary states that inspections are required for all gypsum board installations.
- The same table states that an inspection record card must be kept on the job site.
- Other inspection requirements may depend on the work and applicable code provisions.
“17.08.090 110.3.5 Inspections required for all gypsum board installations”
Kern County Code of Building Regulations — Complete PDF ↗Re-checked Sep 24, 2026
County-wide zoningPresent (with conditions)
Kern County zoning districts and land-use regulation in the unincorporated area of the county.
- The county zoning layer excludes incorporated cities.
- The Kern County Zoning Ordinance is identified as Chapter 19 of the Code of Ordinances.
“The Kern County Zoning layer contains all zoning districts for the county, with the exclusion of the incorporated cities. The Kern County Zoning Ordinance is Chapter 19 of the Code of Ordinances. This title is adopted to promote and protect the public health, safety, and welfare through the orderly regulation of land uses throughout the unincorporated area of the County.”
Planning Documents - Kern County Planning & Natural Resources Dept. ↗Re-checked Sep 24, 2026
Local zoningVaries (with conditions)
Aggregate local zoning across Kern County: county zoning applies in unincorporated areas, while incorporated cities are excluded from the county zoning layer and may have separate municipal controls.
- The county zoning layer expressly excludes incorporated cities.
- This is an aggregate conclusion and does not assert that Kern County administers municipal ordinances.
“The Kern County Zoning layer contains all zoning districts for the county, with the exclusion of the incorporated cities.”
Commercial Zoning Layer - Kern County GIS ↗Re-checked Sep 24, 2026
Zoning districtsPublished (with conditions)
Zoning districts and land-use regulation administered by Kern County Planning and Natural Resources Department in unincorporated Kern County.
- Base zoning districts regulate and control a diversity of land uses.
- Specific uses may be authorized in one district or several districts.
- A single-family residence is authorized by right in residential districts and in commercial and industrial districts when used as a proprietor's quarters.
- A conditional use permit is generally required to authorize a dwelling as the primary use in commercial or industrial districts.
- The source states that the detailed Zoning Ordinance can be ordered or purchased from the Planning Department.
“Base zone districts were established to regulate and control a diversity of land uses. A separate handout is available that describes the various district classifications. The Zoning Ordinance, which contains detailed zoning regulations, can be ordered or purchased at the Planning Department.”
Zone Change ↗Re-checked Sep 24, 2026
Minimum lot sizeDistrict specific (with conditions)
Lot-size standards in Kern County zoning districts in the unincorporated county.
- The County states that the Zoning Ordinance contains development standards for each zone district.
- A zone modification may reduce lot sizes by no more than fifteen percent (15%).
- A variance must be processed for a reduction greater than fifteen percent (15%).
- Applications require payment of filing fees, property-owner approval, justification, a complete legal description, a scaled plot plan, and a completed Hazardous Waste Site Verification Statement.
- The cited page states that lot-size variances or modifications are usually processed as a result of a land-division application.
zone modification maximum lot-size reduction: <= 15 percent
“The Zoning Ordinance lists development standards for each zone district. Relief from strict application of these requirements may be possible through either the ZONE MODIFICATION or ZONE VARIANCE process.”
Zoning Ordinance - Kern County Planning & Natural Resources Dept. ↗Re-checked Sep 24, 2026
Manufactured homesLimited
Occupancy of manufactured/mobile homes on land in unincorporated Kern County outside mobilehome parks and other listed park or camping areas.
- The mobile home and all accessory structures, electrical services and installations, fuel-gas systems, sewage-disposal systems, and water piping must comply with Chapter 17.44 and Kern County Title 19 zoning ordinances.
- More than one mobile home on a parcel requires zoning authorization and written evidence that the second occupant is an immediate family member, with no rent offered or accepted.
- A mobile home or commercial coach must have a valid California vehicle license or, within 30 days, obtain one or be placed on a permitted permanent foundation system and the County tax rolls.
- A mobile home or commercial coach must have an insignia of approval issued by the Department of Housing and Community Development.
- A mobile home, travel-trailer, or mobile-home accessory structure used for habitation must be at least five feet from a property line, subject to the stated post-1990 recessed-mobile-home exception for LPG-related height requirements.
minimum property-line setback for habitation: >= 5 feet (The cited section states no mobile home, travel-trailer, or mobile-home accessory structure being used for habitation may be closer than five feet from a property line.)
“It is unlawful for any person, firm, corporation, owner of the land, or possessor to place or allow to be placed or to occupy a mobile home or to knowingly permit a mobile home to be occupied on land in his possession unless said mobile home and all accessory structures, electrical services and installations, fuel gas systems, sewage disposal systems, and water piping thereto comply with all of the provisions of this chapter in addition to the land use zoning ordinances of the County (Title 19 of this code).”
Kern County Code of Building Regulations, Sections 17.44.050-17.44.070 ↗Re-checked Sep 24, 2026

California rules that apply here

Owner-builder exemptionAvailable (with conditions)
Exemption from California contractor-licensing chapter for an owner-builder who builds or improves a structure on the owner’s property; this does not itself establish exemption from local building permits, inspections, or other code requirements.
- For work personally performed by the owner or performed by the owner’s employees, none of the improvements may be intended or offered for sale, and employee compensation must be wages as their sole compensation.
- For work directly contracted to licensed trade contractors, the owner must directly contract with licensees duly licensed for the respective trades.
- For single-family residential structures under the licensed-contractor arrangement, no more than four structures may be intended or offered for sale in a calendar year; this limitation does not apply if the owner contracts with a general contractor for construction.
- For a homeowner improving a principal residence or its appurtenances, the work must be performed before sale, the homeowner must have actually resided in the residence for the 12 months before completion, and the homeowner must not have used this exemption on more than two structures more than once during any three-year period.
- A nonprofit corporation may qualify when assisting an owner-builder participating in a mutual self-help housing program.
- Sale or offering for sale within one year after completion creates a rebuttable presumption that the structure was undertaken for sale; sale or offering for sale of five or more structures within one year creates a conclusive presumption.
- This is a contractor-licensing exemption and should not be treated as a building-permit exemption.
single-family structures intended or offered for sale: <= 4 structures per calendar year (Does not apply if the owner contracts with a general contractor for construction.) · prior residence occupancy: >= 12 months before completion (Applies to the principal-residence homeowner exemption.) · owner-builder exemption use: <= 2 structures during any three-year period (The statute states the homeowner has not availed himself or herself of the exemption on more than two structures more than once during any three-year period.) · sale presumption period: 1 year after completion (Sale or offering for sale creates a rebuttable presumption; five or more structures creates a conclusive presumption.) · conclusive-presumption threshold: >= 5 structures within one year after completion (Structures sold or offered for sale by the owner-builder.)
“This chapter does not apply to any of the following: (1) An owner who builds or improves a structure on his or her property”
California Business and Professions Code Section 7044 ↗Re-checked Sep 26, 2026
2 more reviewed findings on this topic
- Conditional — Owners who build or improve structures on their own property, and homeowners improving their principal residence or appurtenances, subject to Business and Professions Code section 7044.
  “(a) This chapter does not apply to any of the following: (1) An owner who builds or improves a structure on his or her property”
  California Business and Professions Code Section 7044 ↗Re-checked Sep 26, 2026
- Available (with conditions) — California contractor-licensing requirements for an owner who builds or improves a structure on the owner’s property; this is not stated as an exemption from building permits, inspections, or other code requirements.
  “This chapter does not apply to any of the following: (1) An owner who builds or improves a structure on his or her property”
  California Business and Professions Code section 7044 ↗Re-checked Sep 26, 2026
Building code adoptedAdopted (with conditions)
California Building Standards Code, California Code of Regulations, Title 24, including the 2025 California Building Code and related parts, for buildings and structures subject to the state code.
- The 2025 California Building Standards Code applies to buildings and structures with a permit application date on or after January 1, 2026.
- The applicable local building department or enforcing agency determines how the permit application date is established in a specific jurisdiction.
- The code includes multiple parts, including the California Building Code, California Residential Code, Existing Building Code, Electrical Code, Mechanical Code, Plumbing Code, Energy Code, Wildland-Urban Interface Code, Fire Code, and Green Building Standards Code.
effective date: 2026-01-01 · permit application date: >= 2026-01-01
“The 2025 California Building Standards Code (CBSC), California Code of Regulations (CCR), title 24, will become effective on January 1, 2026, as a result of the 2024 Triennial Code Adoption Cycle. [...] The 2025 CBSC applies to all buildings and structures with a permit application date on or after January 1, 2026.”
Approved Building Standards ↗Re-checked Sep 9, 2026
One more reviewed finding on this topic
- Adopted — California statewide building standards, including residential construction subject to Title 24 of the California Code of Regulations.
  “Except as otherwise specifically provided by law, the building standards adopted and submitted by the department for approval [...] shall be adopted by reference”
  California Health and Safety Code Section 17922 ↗Re-checked Sep 26, 2026
Certificate of occupancyRequired
Completed construction projects within HCAI jurisdiction involving California health facilities.
- The HCAI Compliance Officer issues the project-completion Substantial Compliance or Certificate of Occupancy once required conditions are met.
- The stated examples include delivery of all test reports to the Inspector of Record, clearance of outstanding items, and completion of the Testing, Inspection and Observation Program.
- Once construction is completed, the certificate of occupancy allows the owner to apply to the Department of Health Services for a license to operate the health facility.
“Issues the certificate of occupancy and/or construction final.”
HCAI Standard Project Process ↗Re-checked Sep 26, 2026
Minimum dwelling sizeSpecified
Efficiency units permitted by a California city, county, or city and county.
- The local jurisdiction must adopt an ordinance permitting the efficiency unit.
- Occupancy is limited to no more than two persons.
- The unit may have partial kitchen or bathroom facilities as specified by the local ordinance.
- All other applicable minimum standards under Health and Safety Code Part 1.5 continue to apply.
minimum floor area: >= 150 square feet · maximum occupancy: <= 2 persons
“Notwithstanding Sections 17922, 17958, and 17958.5, a city, county, or city and county may, by ordinance, permit efficiency units for occupancy by no more than two persons which have a minimum floor area of 150 square feet and which may also have partial kitchen or bathroom facilities, as specified by the ordinance.”
California Health and Safety Code Section 17958.1 ↗Re-checked Sep 9, 2026
SetbacksSpecified
Qualifying SB 9 housing developments in single-family residential zones, including development of up to two primary residential units, subject to the cited statutory eligibility requirements and local ministerial review.
- The parcel must be located in a single-family residential zone.
- The project must involve no more than two residential units.
- Objective standards may be applied only if they do not physically preclude the statutory housing objectives, subject to the stated exceptions.
- No setback may be required for an existing structure or a structure constructed in the same location and to the same dimensions as an existing structure.
- For SB 9 projects, side and rear setbacks may not exceed four feet; a local agency may apply a lesser setback, such as 0–4 feet.
- The local agency cannot apply existing side and rear setbacks applicable in the single-family residential zones.
- The four-foot side and rear setback standards are not subject to modification.
- The fact sheet cites Government Code Sections 65852.21(b)(2)(B) and 66411.7(c)(3).
maximum side setback: <= 4 feet (A local agency may choose to apply a lesser setback, including 0–4 feet.) · maximum rear setback: <= 4 feet (A local agency may choose to apply a lesser setback, including 0–4 feet.)
“SB 9 establishes an across-the-board maximum four-foot side and rear setbacks.”
SB 9 Fact Sheet ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- District specific (with conditions) — Building setbacks, side and rear yard requirements, and property line requirements under California's State Housing Law framework.
  “building setback, side and rear yard requirements, and property line requirements are hereby specifically and entirely reserved to the local jurisdictions”
  California Health and Safety Code Section 17922 ↗Re-checked Sep 26, 2026
Living in an RVTemporary only (with conditions)
Occupancy of recreational vehicles as residential units in California.
- RVs are not intended for occupancy as permanent dwellings.
- Unless a local ordinance allows otherwise, RV occupancy generally is limited to mobilehome parks or special occupancy parks governed by the Mobilehome Parks Act or Special Occupancy Parks Act.
- Applicable state or local approval and enforcement requirements depend on the RV's location and classification.
maximum gross area: <= 400 square feet (Measured at maximum horizontal projections; internal living room area must be less than 320 square feet excluding specified built-in equipment and bath/toilet rooms.)
“RVs are not intended for occupancy as a permanent dwelling. [...] Unless otherwise allowed by a local ordinance, RVs generally may be occupied only in mobilehome parks or special occupancy parks”
Information Bulletin 2016-01: Tiny Homes ↗Re-checked Sep 9, 2026
Camping on your landLimited
Camping in units operated by the California Department of Parks and Recreation statewide.
- Camping is confined to areas designated for that purpose.
- Occupancy by the same persons, equipment, or vehicles is generally limited to 30 days in any calendar year in that unit.
- The Department may establish shorter or longer occupancy limits.
- When a shorter seasonal limit applies, the camper must vacate the campsite and may not reregister in the unit until 48 hours have expired, measured from 12:00 noon on the checkout day to 12:00 noon on the second day following.
- A district superintendent may permit one-night camping in a day-use area or portion of one, subject to Department-established fees and vehicle limitations; occupants must vacate by 9:00 a.m. the following morning.
- California State Parks' current reservation policy states that each campground has a consecutive-night limit, requires a 48-hour absence after that limit, and generally has a 30-night annual maximum, subject to individual park policies.
general annual occupancy limit: 30 days per calendar year per unit (The Department may establish shorter or longer limits of occupancy.) · return interval after shorter seasonal limit: 48 hours (Measured from 12:00 noon of the checkout day to 12:00 noon of the second day following.) · one-night camping in day-use area: 1 night (Only if permitted by the district superintendent; occupants must vacate by 9:00 a.m. the following morning.)
“Occupancy by the same persons, equipment, or vehicles of any camping facility is limited to a total of 30 days in any calendar year in that unit.”
California Off-Highway Motor Vehicle Laws 2014 ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Allowed (with conditions) — Temporary camping in California special occupancy parks, including parks containing recreational vehicles, tents, or camping cabins.
  ““Special occupancy park” means a recreational vehicle park, temporary recreational vehicle park, incidental camping area, or tent camp.”
  What is a Mobilehome Park or Special Occupancy Park? ↗Re-checked Sep 26, 2026
Tiny homesAllowed (with conditions)
Occupancy of a structure marketed or described as a tiny home in California.
- The tiny home must comply with applicable standards and be approved as a HUD-Code manufactured home, California Residential or Building Code home, factory-built housing, recreational vehicle, park trailer, or camping cabin.
- The location must be approved for the applicable classification.
- A tiny home that does not fit one of those classifications and does not comply with the California Building Standards Code is a noncomplying structure whose occupancy is illegal.
- Approving and enforcing agencies vary depending on whether the unit is inside or outside a mobilehome or special occupancy park.
park trailer or RV gross area limit: <= 400 square feet (Applicable classification-specific exclusions and standards apply.)
“In order to be occupied, a tiny home must comply with the standards of, and be approved as one of the following types of structures: a HUD-Code manufactured home (MH), California Residential Code or California Building Code home, factory-built housing (FBH), recreational vehicle (RV), park trailer (PT) or camping cabin (CC).”
Information Bulletin 2016-01: Tiny Homes ↗Re-checked Sep 9, 2026
One more reviewed finding on this topic
- Limited — Tiny homes in California that meet the statutory definition of an accessory dwelling unit; the term may describe different structures or vehicles.
  “Possibly. While State ADU Law does not specifically reference “tiny homes,” “tiny home” is an industry term that can mean different structures or vehicles. If the unit meets the definition of an ADU in Government Code section 66313, subdivision (a), it is subject to ADU Law.”
  Accessory Dwelling Unit Handbook, March 2026 ↗Re-checked Sep 24, 2026
Accessory dwellingsAllowed (with conditions)
ADUs and junior ADUs subject to California State ADU Law.
- Approval is ministerial and without discretionary review or a hearing.
- Development standards must be objective and knowable in advance.
- The local permitting agency must determine application completeness and provide written notice within 15 business days.
- If an application is incomplete, the agency must identify missing items and explain how to complete it.
- Local site, building, health, safety, fire, utility, and other applicable requirements continue to apply.
written completeness determination: <= 15 business days (Measured from the permitting agency's receipt of the application.) · final written determination after appeal: <= 60 business days (Applies after receipt of the written appeal.)
“A permit application for an accessory dwelling unit shall be considered and approved ministerially without discretionary review or a hearing [...] A permitting agency shall determine whether an application to create or serve an accessory dwelling unit is complete and provide written notice of this determination to the applicant not later than 15 business days after the permitting agency received the application.”
Accessory Dwelling Unit Handbook March 2026 ↗Re-checked Sep 9, 2026
Who permits septicMixed (with conditions)
California onsite wastewater treatment systems, including septic systems primarily treating domestic wastewater through subsurface disposal.
- The State Water Resources Control Board establishes the statewide OWTS Policy.
- Local agencies, such as county environmental health departments, issue OWTS permits under the statewide policy.
- Local Agency Management Programs may establish locally tailored siting and design standards.
OWTS Policy effective date: 2013-05-13 (Except for Tier 3, local agencies could continue existing permitting programs for 60 months after the effective date.) · Tier 1 maximum flow: <= 3500 gallons per day (Applies to qualifying new or replacement OWTS where no approved LAMP applies.) · Tier 2 maximum flow: <= 10000 gallons per day (Applies under an approved LAMP.)
“The State Water Resources Control Board [...] adopted the OWTS Policy in June 2012. The OWTS Policy authorizes local agencies [...] to issue OWTS permits.”
Onsite Waste Water Treatment Systems ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Mixed (with conditions) — Statewide regulation and management of onsite wastewater treatment systems, commonly known as septic systems.
  “Implementation of the OWTS Policy will be overseen by the State Water Board and the regional water quality control boards”
  Water Quality Control Policy for Siting, Design, Operation and Maintenance of Onsite Wastewater Treatment Systems (OWTS Policy) ↗Re-checked Sep 9, 2026
Septic permitLimited
New, replacement, and corrective-action OWTS in California; existing properly functioning systems may fall under Tier 0 rather than new/replacement permitting requirements.
- Tier 1 applies to qualifying new or replacement OWTS when no Regional Water Board-approved LAMP exists, with a maximum flow of 3,500 gallons per day.
- Tier 2 applies to qualifying new or replacement OWTS under an approved LAMP, with a maximum flow of 10,000 gallons per day.
- Tier 3 applies near impaired surface waters subject to a TMDL, a special LAMP provision, or within 600 feet of a water body listed on OWTS Policy Attachment 2; supplemental treatment may apply.
- Tier 4 applies to systems that are not properly functioning and require corrective action.
- Local agencies issue the permits and local LAMP requirements may differ from Tier 1.
Tier 1 maximum flow: <= 3500 gallons per day (Qualifying new or replacement OWTS without an approved LAMP.) · Tier 2 maximum flow: <= 10000 gallons per day (Qualifying new or replacement OWTS under an approved LAMP.) · Tier 3 water-body setback: <= 600 feet (Applies to a water body listed on OWTS Policy Attachment 2.)
“Tier 1 applies when a Local Agency Management Program (LAMP) has not been approved by the Regional Water Board. Maximum flow rate is 3,500 gpd.”
Onsite Waste Water Treatment Systems ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Required — New and replacement onsite wastewater treatment systems (OWTS), commonly known as septic systems, statewide in California.
  “Every new or replacement septic system requires a permit, either through your local jurisdiction (City or County) OR from the Central Coast Water Board.”
  2023 OWTS Policy ↗Re-checked Sep 26, 2026
Septic inspectionLimited
OWTS in a Tier 3 Advanced Protection Management Program with supplemental treatment components, including systems in specified impaired-water-body areas statewide.
- The requirement applies to OWTS in an Advanced Protection Management Program with supplemental treatment components.
- Ongoing monitoring must follow the OWTS operation and maintenance manual or occur more frequently if required by the local agency or Regional Water Board.
- Where telemetry is not possible, the owner or owner's agent must inspect at least monthly while the system is in use and notify the service provider at least quarterly of observed operating parameters.
- For systems designed to meet disinfection requirements, a service provider must inspect proper operation quarterly while the system is in use unless continuous telemetric monitoring is capable of assessing operation.
- Quarterly effluent sampling and certified-laboratory requirements apply to systems subject to the disinfection provisions.
inspection frequency where telemetry is not possible: per monthly (While the system is in use.) · inspection frequency for disinfection systems: per quarterly (While the system is in use, unless continuous telemetric monitoring is capable of assessing operation.)
“Where telemetry is not possible, the owner or owner’s agent shall inspect the system at least monthly while the system is in use as directed and instructed by a service provider and notify the service provider not less than quarterly of the observed operating parameters of the OWTS. [...] OWTS in an Advanced Protection Management Program designed to meet the disinfection requirements in Section 10.10 shall be inspected for proper operation quarterly while the system is in use by a service provider unless a telemetric monitoring system is capable of continuously assessing the operation of the disinfection system.”
2023 OWTS Policy ↗Re-checked Sep 26, 2026
Well permitRequired
Construction, modification, or destruction of water wells in California.
- The permit is obtained from the applicable local environmental health agency or local water district before construction, modification, or destruction.
- Local enforcing agencies may adopt ordinances that meet or exceed DWR Well Standards.
- If no local well ordinance is adopted, the local enforcing agency must enforce the Statewide Model Well Ordinance.
- Water wells supplying public water systems have additional State Water Resources Control Board Division of Drinking Water certification requirements.
- Water-well construction must be performed by a licensed C-57 Well Drilling Contractor.
“Well owners need to obtain permits from local environmental health agencies or local water districts before construction, modification, or destruction takes place.”
Well Standards ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Limited — Construction, alteration, maintenance, or destruction of water wells, monitoring wells, cathodic protection wells, and geothermal heat exchange wells in California.
  “Permitting and enforcement are carried out by the LEAs, such as the County Department of Environmental Health.”
  Well Standards ↗Re-checked Sep 9, 2026
Mandatory utility hookupSewer (with conditions)
Certain existing OWTS in California Tier 3 impaired-water-body areas that commit to connect to a centralized wastewater collection and treatment system regulated through waste discharge requirements.
- The OWTS must have been constructed and operating, or permitted, on or before the date the nearby water body was added to OWTS Policy Attachment 2.
- The owner must commit by legally binding document to connect to a centralized wastewater collection and treatment system regulated through waste discharge requirements.
- The owner must sign the legally binding document within 48 months after the nearby water body's initial listing on Attachment 2.
- The specified connection date may not extend beyond nine years after the date the nearby water body is added to Attachment 2.
- The rule is an exception to Section 10 requirements for qualifying existing or permitted systems; it is not a general statewide requirement that every property connect to public sewer.
deadline to sign connection commitment: 48 months (Measured from the date the nearby water body is initially listed on Attachment 2.) · maximum time to complete connection: <= 9 years (Measured from the date the nearby water body is added to Attachment 2.)
“The owner must sign the document within forty-eight months of the date that the nearby water body is initially listed on Attachment 2. The specified date for the connection to the centralized community wastewater collection and treatment system shall not extend beyond nine years following the date that the nearby water body is added to Attachment 2.”
2023 OWTS Policy ↗Re-checked Sep 26, 2026
Subdividing landRegulated (with conditions)
Division of land in California that falls within the statutory definition of subdivision, including division for sale, lease, or financing.
- A parcel map is generally required unless a final or parcel map is otherwise required or the preparation is waived by local ordinance.
- Local ordinances may require a tentative map and may establish additional area, improvement, design, drainage, road, sanitary-disposal, water-supply, environmental-protection, and related requirements.
- Certain railroad-right-of-way and governmental or public-utility conveyances are excepted from the parcel-map requirement described in Government Code section 66428(a).
“A parcel map shall be required for subdivisions as to which a final or parcel map is not otherwise required by this chapter, unless the preparation of the parcel map is waived by local ordinance as provided in this section.”
California Government Code Section 66424 ↗Re-checked Sep 9, 2026
Driveway accessRequired
Driveways and driveway connections involving proposed encroachments within, under, or over State highway rights of way.
- The requirement applies to proposed activities related to placement of encroachments within, under, or over State highway rights of way.
- Applications are submitted to the appropriate District Encroachment Permits Office having jurisdictional authority over the site.
- Local or other agency requirements may also apply outside State highway rights of way.
“An encroachment permit must be obtained for all proposed activities related to the placement of encroachments within, under, or over the State highway rights of way.”
Encroachment Permits | Caltrans ↗Re-checked Sep 26, 2026
Permit processPublished (with conditions)
Construction, alteration, repair, movement, improvement, removal, conversion, or demolition of a building or structure in California.
- A separate permit for each building or structure must be obtained from the building official before the work.
- Code requirements vary by city and county; the applicable local building department must be consulted.
“no building or structure may be erected, constructed, enlarged, altered, repaired, moved, improved, removed, converted or demolished unless a separate permit [...] has first been obtained”
Do I need a building permit for my project? ↗Re-checked Sep 9, 2026
Campground & park staysLimited
Occupancy and use of manufactured homes and mobilehomes in California mobilehome parks and other locations subject to HCD jurisdiction.
- HCD administers titling and registration for manufactured homes and mobilehomes.
- HCD-inspected mobilehome parks are subject to health and safety enforcement where local government has not assumed enforcement.
- Manufactured/mobilehome park regulations address construction, use, maintenance, and occupancy.
- Separate local land-use, building, fire, health, and utility requirements may apply.
“MHs may be occupied outside or inside of mobilehome parks and installation and approval for occupancy is governed by the Mobilehome Parks Act (MPA), HSC Sections 18200, et seq., and Title 25, CCR Sections 1000, et seq.”
Manufactured & Mobilehomes ↗Re-checked Sep 26, 2026
2 more reviewed findings on this topic
- Limited — RV and trailer camping at Silver Strand State Beach Campground in the San Diego Coast District.
  “Camping Stay Limits: Applies to persons, equipment, or vehicles and any combination thereof [...] Maximum stay of 30 days per calendar year [...] Maximum 7 consecutive days during peak season (May 15 – September 15) [...] Maximum 14 consecutive days during non-peak season”
  Silver Strand State Beach Campground Rules and Regulations ↗Re-checked Sep 9, 2026
- Limited — Occupancy and use of recreational vehicles in California special occupancy parks and designated RV sections of mobilehome parks.
  “Unless otherwise allowed by a local ordinance, RVs generally may be occupied only in mobilehome parks or special occupancy parks governed by the Mobilehome Parks Act”
  What is a Mobilehome Park or Special Occupancy Park? ↗Re-checked Sep 26, 2026
county zoning authorityGeneral
California county legislative bodies' authority to adopt zoning ordinances regulating buildings, structures, land uses, lots, yards, open space, lot coverage, intensity of use, parking, loading, and setbacks within county jurisdiction, including unincorporated areas.
- The authority is exercised pursuant to Government Code Chapter 4, Zoning Regulations.
- The statute separately authorizes city legislative bodies; incorporated municipalities may exercise their own zoning authority.
- Government Code Section 65850 also lists authority to regulate signs and billboards, building and structure location, height, bulk, number of stories, and size, lot and open-space size and use, lot coverage, intensity of land use, offstreet parking and loading, and building setback lines.
- The cited section states it was amended by Stats. 2017, Ch. 376, Sec. 1, effective January 1, 2018.
“The legislative body of any county or city may, pursuant to this chapter, adopt ordinances that do any of the following:”
California Government Code Section 65850 ↗Re-checked Sep 21, 2026
county building authorityGeneral
California counties administering and enforcing state building standards through county building departments, including residential construction in unincorporated areas.
- Each county must maintain building standards and state building regulations in the office of the building official responsible for administration and enforcement of state building standards.
- The statewide Title 24 standards apply subject to statutory exceptions and any authorized local amendments or local requirements.
- The cited HCD bulletin concerns the 2019 California Building Standards Code and its July 1, 2021 supplement; later code editions may supersede those particular edition dates.
“These codes shall be maintained in the office of the building official responsible for the administration and enforcement of state building standards”
Information Bulletin 2021-02: 2019 California Building Standards Code Supplement ↗Re-checked Sep 26, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Lot coverage — Lot-coverage requirements in unincorporated Kern County.
Agricultural exemption — Agricultural exemptions from Kern County development, building, or zoning requirements.
Short-term rentals — Short-term rental use in Kern County.

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.

Water rights & wells in Kern County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from California’s water agency.

Adjudicated — rights fixed

Water rights here have been fixed by a court. New supply effectively means acquiring an existing right.

Household wellPermit required — restricted

California requires no STATE permit for a domestic well — wells are permitted by the county — but under SGMA a Groundwater Sustainability Agency can meter or restrict new wells in medium/high-priority and critically overdrafted basins, and Executive Order N-7-22 requires counties in those basins to get GSA verification that a new well is consistent with the Groundwater Sustainability Plan before permitting.

Limit: 2 acre-feet/year de minimis under SGMA (Water Code §10721(e)) — largely exempt from GSA metering/fees

California DWR / State Water Board — SGMA de minimis & EO N-7-22 Action 9 FAQ ↗

Antelope Valley Basin — Adjudicatedpartial of county
Final judgment 2015; pumping allocated among parties by the Antelope Valley Watermaster with a ramp-down to safe yield; new appropriation effectively closed. (Distinct from the Sacramento Valley 'Antelope' subbasin in Tehama County.)
California DWR — Adjudicated Areas ↗
Kern County Subbasin — Critically Overdraftedmajority of county
Bakersfield / southern San Joaquin Valley; one of the largest-overdraft subbasins in the state; GSP allocations; new wells subject to GSA review and EO N-7-22.
California DWR Bulletin 118 — Critically Overdrafted Basins ↗
Tehachapi / Cummings / Brite Basins — Adjudicatedlocalized of county
Tehachapi-area basins (adjudicated 1970–1973) under a watermaster; new appropriation effectively closed to new landowners.
California DWR — Adjudicated Areas (Bulletin 118) ↗
Cuyama Valley Basin — Critically Overdraftedpartial of county
Adopted GSP with allocation-based pumping reductions; new agricultural wells effectively curtailed; new wells subject to county permit + EO N-7-22/GSA review.
California DWR Bulletin 118 — Critically Overdrafted Basins ↗
Indian Wells Valley Basin — Critically Overdrafted (Under Adjudication)localized of county
Ridgecrest / China Lake desert basin ~4x overdraft, also in active court adjudication; import-fee framework; effectively closed to new large appropriation.
California DWR Bulletin 118 — Critically Overdrafted Basins ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the California state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Kern County, California

Is Kern County a good place to live off-grid or homestead?

Kern County scores 31/100 on the Bolthole Index, a weak county profile. Watch-outs: weak self-sufficiency basics: only 8.9″ of rain a year, in severe drought 41.5% of years and elevated mid-century heat, water, rain, or wildfire exposure.

Do you need a building permit in Kern County, California?

Kern County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Kern County Environmental Health Division (Public Health Services Department). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Kern County?

Living in an RV on your own land in Kern County is allowed on a temporary basis only: Statewide rule. Occupancy of recreational vehicles as residential units in California. RVs are not intended for occupancy as permanent dwellings. Unless a local ordinance allows otherwise, RV occupancy generally is limited to mobilehome parks or special occupancy parks governed by the Mobilehome Parks Act or Special Occupancy Parks Act. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Kern County, California?

Land in Kern County runs about $10,539 per acre, based on the latest county data.

What is the water situation in Kern County?

Kern County gets about 8.9" of rain a year, with severe drought in roughly 41.5% of years. On water rights, Kern County lies in the Antelope Valley Basin — Adjudicated — Final judgment 2015; pumping allocated among parties by the Antelope Valley Watermaster with a ramp-down to safe yield; new appropriation effectively closed. (Distinct from the Sacramento Valley 'Antelope' subbasin in Tehama County.).

How remote is Kern County?

A typical private-land location has about 26,686 people within 15 miles and 9,069,236 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

Building permits, zoning and septic rules in Kern County, California

At a glance

Who to call

Do you need a building permit in Kern County, California?

Who is the Kern County building department, and how do you reach them?

Does Kern County have zoning?

How do septic permits work in Kern County?

Can you live in an RV or tiny home on your land in Kern County?

Building a home in Kern County: the steps, in order

What to check before you buy land in Kern County

Watch-outs

Sources

Kern County in California

How Kern County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Kern County

Kern County rules

California rules that apply here

Still unanswered

Water rights & wells in Kern County

Living off-grid in Kern County, California

Is Kern County a good place to live off-grid or homestead?

Do you need a building permit in Kern County, California?

Can you live in an RV or tiny home on your land in Kern County?

How much does land cost in Kern County, California?

What is the water situation in Kern County?

How remote is Kern County?

How Kern compares in California