Los Angeles County, CA Building Permits, Zoning & Septic

Unincorporated Los Angeles County, California requires building permits and applies Title 22 zoning to land outside its 88 cities¹²³. Public Works Building and Safety handles construction permits through district offices assigned by location⁴. Septic approval comes from the Department of Public Health, and a new system cannot be approved when public sewer is available within 200 feet of the building⁵⁶.

At a glance

Building permit: Required in unincorporated areas; which office handles it depends on your address (use the online Service Locator)⁷
Zoning: Yes; Title 22 zones every parcel outside the county's 88 cities²³
Septic: County-permitted through Public Health's Local Agency Management Program, not Public Works⁵
RV occupancy: Not treated as a permanent home under state rules outside a mobilehome or special occupancy park; no confirmed county exception for private rural land⁸
Manufactured home living: Allowed on a vacant parcel with county approval, as a certified double-wide on a permanent foundation⁹
Owner-builder exemption: Yes, statewide; an Owner-Builder Declaration is required at permit issuance, and resale use is capped¹⁰
Minimum lot size / setbacks: Set by your parcel's specific zone under Title 22; no single countywide number¹¹
Water wells: A local environmental health agency or water district permit is required before construction, modification or destruction¹²

Who to call

Building permits

Los Angeles County Public Works, Building and Safety Division

Building, electrical, mechanical and plumbing permits, plan review and inspections for unincorporated Los Angeles County; this is the division headquarters, but 10 separate district offices actually serve unincorporated communities depending on location

(626) 458-3173

900 S. Fremont Avenue, 3rd Floor, Alhambra, CA 91803

Online permits →

Zoning

Los Angeles County Department of Regional Planning (LA County Planning)

Zoning, land-use review, subdivisions, ADU applications and zoning enforcement for unincorporated Los Angeles County

(213) 974-6411

[email protected]

320 West Temple Street, Los Angeles, CA 90012

Online permits →

Septic permits

LA County Department of Public Health, Environmental Health – Onsite Wastewater Treatment Program

Review and approval of septic (onsite wastewater treatment) system plans, soil evaluations and inspections for unincorporated Los Angeles County under the Local Agency Management Program

(626) 430-5380

5050 Commerce Drive, Baldwin Park, CA 91706

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

Do you need a building permit in unincorporated Los Angeles County?

Unincorporated Los Angeles County requires a permit before you build, add on, alter, move or demolish a structure, or work on its electrical, mechanical or plumbing systems¹⁷. The 2025 California Building Standards Code applies to buildings and structures with a permit application date on or after January 1, 2026¹³. Once you have a permit, request the first inspection within 12 months of issuance and schedule follow-up inspections every 6 months to keep the permit active¹⁴. California's owner-builder exemption can remove the contractor-license requirement in qualifying cases, but it does not remove building permits or inspections¹⁵.

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

Los Angeles County Public Works, Building and Safety Division, issues building permits for unincorporated communities, but it does this through 10 separate district offices rather than one central counter⁴. Start with the county's online Service Locator and your street address or parcel number; it tells you which district office (or, in some areas, which contract-city office) actually handles your permit⁴. The division's headquarters, which oversees plan check, electrical, mechanical/plumbing and grading sections, is at 900 S. Fremont Avenue, 3rd Floor, in Alhambra, with the Building Plan Check line at (626) 458-3173⁴. Apply and track everything, including inspections, through the county's EPIC-LA online system⁴.

Does Los Angeles County have zoning?

Unlike most rural counties, unincorporated Los Angeles County is fully zoned: Title 22 applies to every property, use, building and structure outside the county's 88 cities, and every parcel has a specific zone on file with LA County Planning²¹⁶¹¹³. Minimum lot size, setbacks, height limits and lot coverage are all set at the zone level rather than by one countywide number, so you need to look up your parcel's actual zone before you plan anything¹⁷. Some rural areas also carry supplemental Community Standards Districts on top of the base zoning, adding local rules of their own¹¹. Reach LA County Planning directly to confirm your zone and what it allows before you buy¹⁸.

How do septic permits work in Los Angeles County?

Septic systems in unincorporated Los Angeles County are reviewed and approved by the Department of Public Health's Environmental Health division under its Local Agency Management Program, not by Public Works⁵¹⁹. You must submit an application and get plan approval from the Director before any construction, installation, alteration or repair of an onsite wastewater system begins²⁰. The county won't approve a new septic system, or the repair or replacement of one, if a public sewer is available within 200 feet of the building or proposed building⁶. Soils here are a real constraint: only about 7% of Los Angeles County has no severe limitations for a conventional septic drain field, so a site and soil evaluation is essential before you count on a standard system²¹.

Can you live in an RV, manufactured home or tiny home on your land in Los Angeles County?

California treats RVs as temporary units, not permanent dwellings, and generally limits RV occupancy to mobilehome parks or special occupancy parks unless a local ordinance says otherwise; we could not confirm a Los Angeles County ordinance that allows year-round RV living on raw rural land⁸. A manufactured home is a clearer path: the county allows a certified double-wide manufactured home as a single-family residence on a vacant parcel, provided it goes on a permanent foundation approved by Building & Safety and meets Title 22 development standards⁹. A tiny home must be on an approved location and comply as a recognized type such as a manufactured home, code-built home, factory-built home or RV; we could not confirm a separate Los Angeles County rule for tiny-home occupancy on private land, so ask LA County Planning to classify the unit before purchase²².

How do you build a home in unincorporated Los Angeles County?

Use the county's Service Locator with your address or parcel number to find which of the 10 district offices (or contract-city office) serves your property⁴.
Contact that office to find out whether a plan check is required and what it needs from you⁴.
Apply for your permit through EPIC-LA, LA County's online permitting system, and upload your plans and required attachments⁴.
Pay the plan-review invoice once the county confirms your documents are complete, and wait for approval or a corrections list⁴.
In parallel, apply for your septic (onsite wastewater) plan approval with the Department of Public Health's Environmental Health division before any installation work begins¹⁹²⁰.
Confirm your parcel's zone with LA County Planning so your setbacks, lot coverage and any Community Standards District rules are settled before you finalize your site plan¹⁸¹¹.
Once your permit issues, request your first inspection within 12 months and keep follow-up inspections on a 6-month cadence until the project closes out¹⁴.

What should you check before buying rural land in Los Angeles County?

Only about 31% of Los Angeles County land has a slope of 15% or less, so verify grading, road access and a feasible building pad for the specific parcel²³. Severe drought has occurred in roughly 41% of years, and only about 7% of county soils lack severe limitations for a conventional septic drain field, so investigate both a lawful water source and septic feasibility during due diligence²⁴²¹. California requires a permit from the applicable local environmental health agency or water district before a water well is constructed, modified or destroyed¹². Flood Protection Districts add restrictions on land that Public Works designates as subject to substantial flood hazard, so check the zoning map and ask Public Works about the parcel²⁵. The effective property-tax rate is about 0.7%, and the median annual bill is about $5,438²⁶²⁷.

Watch-outs

We could not confirm a specific Los Angeles County rule on temporary camping on private land, or on tiny-home occupancy outside the recognized manufactured-home/RV/factory-built categories; treat both as open questions and confirm directly with LA County Planning before you rely on either¹⁸.
The county's own driveway-access standard we found applies to shared driveways serving three or more dwelling units, not a typical single-family driveway; ask your district Building and Safety office what applies to a single home's access⁴.
Building and Safety's own pages give slightly different counts of its contract-city offices depending on which page you read; use the Service Locator by address rather than relying on either count⁴.

Sources

Written September 29, 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 Los Angeles County scores

Seclusion17100% ev.

Self-Sufficiency30100% ev.

Admin Boringness41100% ev.

Durability26100% ev.

Property Autonomy56100% ev.

Carry Cost27100% 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 →

$888kTypical home

0.7%Property tax

$21,834Land / acre

15.1"Annual rain

40.8% of yrsSevere drought

19.5 / yr (+12.5)Mid-century 100°F days

105.8 daysMid-century dry spell

2.05" (+3.3%)Mid-century 1-day rain

1.1×Wildfire change factor

100%Forward climate coverage

$1,492Home insurance / yr

4.5% / yrInsurance growth

1.18%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

55,165People within 30 min

18,036,060People within 2 hr

431,257Radius comparison (15 mi)

2,380.6People / sq mi

31.8%Federal land

31.1%Land at 15% slope or less

6.6%Septic soil without severe limits

155,039 acWorkable land screen

17.6 tonsBiomass / forest ac

62.1°FAvg temp

Answers from the rulebook for Los Angeles County

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

Los Angeles County rules

Building permitRequired
Residential construction, additions, alterations, repairs, and other building projects in unincorporated Los Angeles County.
- Los Angeles County Public Works issues permits for properties in unincorporated Los Angeles County.
- Properties outside the County's jurisdiction may be handled by another office.
- The correct permit type and work category depend on the project.
“Before you begin your project, you’ll need the right permit type and work category.”
Building and Safety - LA County Public Works Permits ↗Re-checked Sep 24, 2026
Building code adoptedAdopted (with conditions)
County building-code administration for unincorporated Los Angeles County and County-served contract-city offices.
- The State updates Building Standards Codes every three years.
- The 2023 California Building Standards Codes were implemented by Los Angeles County on January 1, 2023.
- Los Angeles County amended the State code for construction concerns specific to the Southern California region.
- County Building and Safety services also operate through contract-city offices; incorporated municipalities may have additional or different local administration.
- Construction remains subject to the adopted County code and its amendments.
implemented date: 2023-01-01
“The State of California adopts updated Building Standards Codes every three years, and pursuant to that schedule, the updated California Building Standards Codes was implemented on January 1, 2023, in the form of the 2023 Los Angeles County Building Codes.”
Los Angeles County Public Works Fiscal Year 2024-2025 Report ↗Re-checked Sep 24, 2026
InspectionsRequired
Building projects handled by Los Angeles County Public Works in unincorporated Los Angeles County.
- Inspections are used to verify that work matches the permit.
- Examples include general, grading, and final inspections.
- The first inspection must be requested within 12 months of permit issuance.
- Follow-up inspections must be scheduled every 6 months to keep the permit active.
first inspection deadline: 12 months after permit issuance · follow-up inspection interval: 6 months (to keep the permit active)
“Inspections are needed to make sure the work being done matches the permit.”
Building and Safety - LA County Public Works Permits ↗Re-checked Sep 24, 2026
County-wide zoningPresent (with conditions)
All properties, uses, buildings, structures, and land in the unincorporated area of Los Angeles County.
- Title 22 applies to the unincorporated area, not automatically to incorporated municipalities.
- Governmental and quasi-governmental agencies may be exempt from portions of Title 22 under the California Government Code.
- No land may be used and no structure may be constructed, occupied, enlarged, altered, or moved except as permitted in Title 22.
- Title 22 does not relieve a person from complying with other applicable federal, State, or County agency regulations.
- Later amendments and additions to Title 22 are included when the Title is referenced.
“This Title 22 shall apply to all properties within the unincorporated area of Los Angeles County, including all uses, buildings, structures, and land owned by any private person, firm, corporation, or organization, or the County or other federal, State, or local agencies.”
Los Angeles County Code Title 22: Planning and Zoning ↗Re-checked Sep 24, 2026
Local zoningVaries (with conditions)
Aggregate local-zoning status across Los Angeles County, distinguishing County-administered zoning in unincorporated territory from zoning administered by incorporated municipalities.
- The County Title 22 rule is expressly limited to properties in the unincorporated area.
- This aggregate claim does not treat the County as administering each incorporated municipality’s zoning ordinance.
- For unincorporated territory, land use and structures are subject to Title 22 permissions and conditions.
- Governmental and quasi-governmental exemptions and other applicable federal, State, or County regulations may apply.
“Within LA County there are 88 cities, each with their own city council and planning department. The areas that are not part of a city are unincorporated and we are their planning department.”
Los Angeles County Code Title 22: Planning and Zoning ↗Re-checked Sep 24, 2026
Zoning districtsPublished (with conditions)
County zoning districts and supplemental Community Standards Districts in unincorporated Los Angeles County.
- LA County Planning administers zoning for properties outside incorporated cities and in unincorporated Los Angeles County.
- Every property in the County has a specific zone, with details in County Code Title 22.
- County Community Standards Districts supplement countywide zoning and subdivision regulations and apply in specified unincorporated geographic areas.
- Incorporated cities have their own city councils and municipal land-use rules; this claim does not characterize those municipal rules as County-administered.
“Some of the County’s zoning categories are agricultural, residential, commercial, and industrial. Every property in the County has a specific zone.”
Land Use and Zoning - LA County Planning ↗Re-checked Sep 24, 2026
Manufactured homesAllowed (with conditions)
Use of a manufactured home as a single-family residence on a vacant parcel in unincorporated Los Angeles County.
- County approval is required.
- The manufactured home must be a double-wide mobile home certified under the National Mobile Home Construction and Safety Standards Act of 1974.
- It must be placed on a permanent foundation system approved by Building & Safety.
- It must comply with Title 22 Zoning Code development standards.
“A Manufactured home (double-wide mobile home) may be used as single-family residences (house) upon County approval [...]”
FAQs - LA County Planning ↗Re-checked Sep 24, 2026
Accessory dwellingsAllowed (with conditions)
Accessory dwelling units and junior accessory dwelling units in unincorporated Los Angeles County.
- An ADU is a unit with a full kitchen and bathroom accessory to residential use and may be attached or detached.
- A JADU has a maximum size of 500 square feet, must be within the main home, and must have its own exterior access.
- County review and approval procedures apply; County pre-approved plans are available through LA County Planning and Public Works Building & Safety.
- The County ADU ordinance amendment approved in October 2024 became effective August 28, 2025 and updates local standards to comply with State law.
junior ADU maximum size: <= 500 square feet (JADU must be within the main home and have its own exterior access)
“This program makes pre-approved ADU plans available to the public.”
Accessory Dwelling Units - LA County Planning ↗Re-checked Sep 24, 2026
Who permits septicCounty
OWTS review and approval in unincorporated Los Angeles County
- The County Department of Public Health acts under the LAMP.
- The LAMP also applies to contracted cities, but this claim is scoped to unincorporated county areas.
- The page states the effective date as November 1, 2018.
effective date: 2018-11-01
“Effective November 1, 2018, DPH reviews and approves OWTS under the provisions of the LAMP to residents of Unincorporated County areas and contracted cities.”
Local Agency Management Program (LAMP) ↗Re-checked Sep 24, 2026
Septic permitRequired
Construction, installation, alteration, or repair of an OWTS or privy structure in unincorporated Los Angeles County
- An application must be submitted to the Director.
- Plan approval must be received before any work is performed.
- The Director's plan approval is separate from other permit requirements, including Title 28 Plumbing Code permits and renewable operating permits for NOWTS.
- Applications use forms provided by the Director and any required fee is due at application.
“A person proposing to construct, install, alter or repair any onsite wastewater treatment system or part thereof, or a privy structure shall submit an application and receive plan approval from the Director [...] prior to any work being performed.”
New Ordinance Adopted - Local Agency Management Program ↗Re-checked Sep 24, 2026
Mandatory utility hookupSewer (with conditions)
Sanitary sewer availability and OWTS use in unincorporated Los Angeles County
- The County Director shall not issue a permit for a new OWTS, or approve repair, replacement, or evaluation of an existing OWTS, when a public sewer is available within 200 feet of the building or proposed building.
- The source provision addresses OWTS approval restrictions; it does not establish a universal countywide sewer-service connection mandate for every parcel.
public sewer availability distance: <= 200 feet (applies to the building or proposed building)
“The Director shall not issue a permit for a new onsite wastewater treatment system, approve the repair or replacement of an onsite wastewater treatment system, nor approve a project requiring the evaluation of an existing onsite wastewater treatment system if a public sewer is available within two hundred (200) feet of the building or proposed building.”
New Ordinance Adopted - Local Agency Management Program ↗Re-checked Sep 24, 2026
Subdividing landRegulated (with conditions)
Division, design, and use of individual parcels in unincorporated Los Angeles County, including minimum lot size, lot configuration, access, height restrictions, and yard setbacks.
- Subdivision and zoning regulations are implemented through County Titles 21 and 22.
- Specific plans and other applicable land-use regulations may impose additional requirements.
- This claim does not state that incorporated cities are administered by the County.
“Zoning and subdivision regulations govern the division, design and use of individual parcels of land”
Los Angeles County General Plan, Chapter 6: Land Use Element ↗Re-checked Sep 24, 2026
Driveway accessLimited
Driveway access to parking areas serving three or more dwelling units under County Title 22 zoning standards.
- The rule applies to driveways providing access to parking areas serving three or more dwelling units.
- Driveways must be at least 10 feet wide for each direction.
- If paving is required, pavement must be at least 10 feet wide for its entire length, except that a center strip over which vehicle wheels do not normally pass need not be paved.
- Unless modified by the Director of Public Works because of topographical or other conditions, no portion of the driveway may exceed a 20 percent slope.
- Where the slope changes, vehicles must be able to pass without undercarriage interference.
minimum driveway width per direction: >= 10 feet · maximum driveway slope: <= 20 percent (May be modified by the Director of Public Works because of topographical or other conditions.)
“Access (e.g., driveways) to parking areas that serve three or more dwelling units shall comply with the following standards”
Los Angeles County Code Title 22, Planning and Zoning ↗Re-checked Sep 24, 2026
2 more reviewed findings on this topic
- Limited — Any driveway or access road serving property in the unincorporated area of Los Angeles County and connecting to a public right-of-way.
  “Adequate sight distance from any driveway or access road to the public right-of-way shall be maintained to the satisfaction of Public Works.”
  Ordinance No. 2022-0008 amending Title 22 – Planning and Zoning ↗Re-checked Sep 25, 2026
- Limited — Private developments in Los Angeles County subject to discretionary approval or Title 22 Chapter 22.48 Part 4 improvement requirements, including tentative maps, parcel maps, plot plans, conditional use permits, and certain single-lot developments.
  “These guidelines shall be applicable for all private developments, subject to discretionary approval or those projects subject to improvement requirements under Los Angeles County Code Title 22, Chapter 22.48, Part 4 (Section 22.48.220, et seq.).”
  Access Management for Private Developments Guidelines Manual ↗Re-checked Sep 25, 2026
Building in a floodplainLimited
Development within Los Angeles County Flood Protection District boundaries in unincorporated Los Angeles County.
- Flood Protection Districts regulate properties designated by Public Works as subject to substantial flood hazard.
- The regulations supplement other Title 22 flood-protection regulations.
- New buildings or structures are generally barred within the district except accessory buildings and structures that will not substantially impede water flow and are approved by Public Works under Title 26, parking lots or buildings incidental to a lawfully established use, and flood-control structures approved by Public Works.
- Alteration, modification, enlargement, or reconstruction is generally barred except for qualifying nonconforming buildings and structures under §§22.172.020.B and 22.172.020.C.
- Flood Protection Districts are shown on the Zoning Map; the opened code lists Mill Creek District No. 3, Ordinance 12413, adopted August 11, 1981.
identified district number: 3 (Mill Creek) · identified ordinance adoption date: 1981-08-11
“Flood Protection Districts are established to regulate properties within areas designated by Public Works as subject to substantial flood hazard.”
Los Angeles County Code Title 22, Flood Protection Districts ↗Re-checked Sep 24, 2026
Short-term rentalsLimited
Short-term rentals in unincorporated Los Angeles County.
- STRs are allowed only as an accessory use to existing dwelling units in zones that permit residential uses.
- STRs must be registered under Division 3 of Title 7 of the Los Angeles County Code.
- Only registered primary residences qualify.
- Annual registration is required.
- The primary residence may be rented without a host present overnight only subject to a calendar-day limit stated in Title 7; the opened fact sheet does not state the numeric day limit.
- Guest occupancy is limited to two persons per bedroom plus two, with an overall maximum of 12 people per booking.
- Non-habitable structures, temporary structures, and habitable structures other than dwelling units may not be used.
- The ordinance does not include amendments to specific plans or local coastal programs, which were to be prepared separately.
occupancy limit: two persons per bedroom plus two persons (Overall limit of 12 people per STR booking) · maximum occupancy: <= 12 persons per STR booking
“Guest occupancy is limited to two persons per bedroom, plus two, with a maximum occupancy of 12 guests per booking or reservation.”
Short-Term Rental Ordinance/Title 22 Project Summary ↗Re-checked Sep 24, 2026
Permit feesPublished (with conditions)
Los Angeles County Planning filing fees and related development-impact fees for applications in unincorporated Los Angeles County.
- The published filing-fee schedule is effective March 1, 2026.
- Development impact fees, exactions, and affordability requirements vary by project and may be imposed by the County and special districts; the source directs applicants to consult the appropriate agency for current information and project applicability.
- This source addresses Planning filing fees and related fees, not a complete Building and Safety construction-permit fee table.
fee schedule effective date: 2026-03-01 · regular report fee: 110 USD per report · complex report fee: 263 USD per report · County processing fee for CEQA filing: 25 USD
“Effective March 1, 2026 [...] A $25 County processing fee is also required”
Fees - LA County Planning ↗Re-checked Sep 24, 2026
Permit processPartial
County Planning review process for the cited standard ADU applications in unincorporated Los Angeles County.
- The application requires a site plan and complete plan set with the listed site information and supporting materials.
- Incomplete applications will not be accepted.
- After assignment, a Planner checks completeness, sends an invoice, and proceeds with review and approval.
- This is a Planning/ADU process and does not establish the complete process for every permit type.
“Upload the complete plan set and all other required materials. Incomplete applications will not be accepted.”
Standard ADU Plans Program - County Catalog ↗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
3 more reviewed findings on this topic
- Conditional — Owner-builders performing construction, alteration, repair, improvement, or remodeling in California, including Los Angeles County.
  “An owner-builder is exempt from licensure, but there are limitations.”
  Owner-Builder Overview ↗Re-checked Sep 24, 2026
- 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
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 homesLimited
A structure commonly referred to as a tiny home that is sold, rented, leased, or occupied in California, including unincorporated Los Angeles County.
- The tiny home must be used on an approved location and comply with all applicable laws.
- If built on a chassis with axles, it must contain 400 square feet or less of gross floor area excluding loft area space, be considered an RV, camping cabin, or park trailer, and its construction and occupancy are enforced by the local enforcement agency with appropriate jurisdiction.
- If not built on a chassis with axles, it must be placed on a foundation or otherwise permanently affixed to real property, comply with California Building Standards Code or factory-built housing standards, and may be enforced by the local enforcement agency with appropriate jurisdiction.
- The State bulletin states that a noncomplying residential structure has illegal occupancy and is subject to punitive action by the appropriate enforcement agency.
gross floor area for chassis-with-axles classification: <= 400 square feet (Excluding loft area space; only where the structure is considered an RV, camping cabin, or park trailer.)
“While there is no current statutory definition, a tiny home sold, rented, leased or occupied with in California may be legal if used on an approved location, complies with all applicable laws, and is either: • Built on a chassis with axles; contains 400 square feet or less of gross floor area (excluding loft area space); is considered an RV, CC or PT; is not under HCD’s jurisdiction for the design and construction of the unit; and its construction and occupancy is enforced by local enforcement agencies with appropriate jurisdiction; or • Not constructed on a chassis with axles; is placed on a foundation or otherwise permanently affixed to real property; and complies with CBSC or FBH standards; and may be enforced by local enforcement agencies having appropriate jurisdiction.”
Information Bulletin 2016-01 (MH, FBH, SHL, MP/SOP, RT, OL) — Revised: Tiny Homes ↗Re-checked Sep 25, 2026
One more reviewed finding on this topic
- Allowed (with conditions) — Occupancy of a structure marketed or described as a tiny home in California.
  “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
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
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

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 Los Angeles 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 ↗

Central & West Coast Basins — Adjudicatedmajority of county
Court-adjudicated 1961/1965; pumping rights allocated to named parties under a watermaster; a new landowner cannot obtain new groundwater rights except by acquiring an existing allocation.
California DWR — Adjudicated Areas (Bulletin 118) ↗
Raymond, Main San Gabriel & Six Basins — Adjudicatedmajority of county
San Gabriel Valley adjudications (Raymond 1944, Main San Gabriel 1973, Six Basins 1998) under watermasters; new appropriation effectively closed to new landowners.
California DWR — Adjudicated Areas (Bulletin 118) ↗
Upper Los Angeles River Area (ULARA / San Fernando) — Adjudicatedpartial of county
Adjudicated 1979 (San Fernando, Sylmar, Verdugo, Eagle Rock); court-fixed rights under a watermaster; new appropriation effectively closed.
California DWR — Adjudicated Areas (Bulletin 118) ↗
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 ↗
Puente & Lytle Creek Basins — Adjudicatedlocalized of county
Puente Basin (1985 judgment, LA) and Lytle Creek (1924 decree, San Bernardino) under watermasters; pumping allocated, new appropriation closed.
California DWR — Adjudicated Areas ↗
Yucaipa & Santa Clarita Valley Subbasins — High Prioritylocalized of county
High-priority SGMA subbasins (Yucaipa in the Upper Santa Ana Valley; Santa Clarita Valley East) with adopted GSPs; new wells subject to GSA/EO N-7-22 review.
California DWR — SGMA Basin Prioritization ↗

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 Los Angeles County, California

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

Los Angeles County scores 28/100 on the Bolthole Index, a weak county profile. Watch-outs: about 55,165 people within a 30-minute drive and elevated mid-century heat, water, rain, or wildfire exposure.

Do you need a building permit in Los Angeles County, California?

Los Angeles County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Los Angeles County Department of Public Health, Environmental Health. 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 Los Angeles County?

Living in an RV on your own land in Los Angeles 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 limited to specific cases. Confirm with the county before relying on it.

How much does land cost in Los Angeles County, California?

Land in Los Angeles County runs about $21,834 per acre, based on the latest county data.

What is the water situation in Los Angeles County?

Los Angeles County gets about 15.1" of rain a year, with severe drought in roughly 40.8% of years. On water rights, Los Angeles County lies in the Central & West Coast Basins — Adjudicated — Court-adjudicated 1961/1965; pumping rights allocated to named parties under a watermaster; a new landowner cannot obtain new groundwater rights except by acquiring an existing allocation..

How remote is Los Angeles County?

A representative private-land location has about 55,165 people within a 30-minute drive and 18,036,060 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Building permits, zoning and septic rules in unincorporated Los Angeles County