Local zoning · Los Angeles County

Los Angeles County — Nonconforming Uses

Q: How long can a nonconforming commercial use continue in unincorporated County areas?

Time limits depend on the category in § 22.172.050 — some situations (unimproved lots) have a 1‑year termination, some signs 5 years , and other buildings may have extended schedules tied to building type (20+ years or life‑of‑type rules). Check the specific subparagraph in § 22.172.050 that fits your case.

Q: Can I add on to a nonconforming use or a nonconforming building?

Generally no. § 22.172.020.B–C prevents expansion or enlargement of nonconforming uses or structures except for limited exceptions (e.g., some residential additions or required seismic retrofits). Always confirm with the Director.

Q: What options does an owner have if the County sets a termination date?

Owners can apply to the Director under § 22.172.060 for an extension of time or substitution of an allowed use; that application is processed as a Type III discretionary review and requires findings showing no undue harm and (in some instances) avoidance of an unconstitutional taking.

Q: If I stop operating a nonconforming use, does that terminate my rights?

Yes — discontinuance rules in § 22.172.050.A indicate that discontinuing the use for two consecutive years generally terminates the right to resume the nonconforming use (subject to some exceptions and extensions). Confirm your category in § 22.172.050 .

Q: What is the County’s test for whether repairs force conformity?

If maintenance/repairs within any 12‑month period exceed 25% of the building’s market value for certain nonconforming structures, the building must be brought into conformance. The valuation method and appeals process are described in § 22.172.020.H and § 22.172.020.G .

Q: Where do I find specific yard, height and parking standards that interact with nonconforming rules?

Look up the applicable zone in § 22.06.010 , then follow to the zone’s development standards chapter or table (for example, § 22.362.070 for R‑3, § 22.416.040 for CSLA R‑1), and see Chapter 22.112 for parking. Nonconforming rules remain in Chapter 22.172 .

Nonconforming Uses under the Los Angeles County local zoning and planning code, with the controlling citations.

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Last reviewed: July 3, 2026

Overview

This page explains how the Los Angeles County Planning and Zoning Code treats nonconforming uses, nonconforming buildings/structures, and nonconforming lots in the unincorporated areas of Los Angeles County. The controlling rules appear in Title 22 (Planning and Zoning), primarily in Chapter 22.172 for nonconforming situations; zoning districts and development standards that interact with those rules are in Divisions and Chapters across Title 22. Key rules cover continuation, repair/replacement after damage, limits on additions/expansions, termination schedules (amortization), and administrative review for time extensions or substitution of use. See § 22.172.010–§ 22.172.060 for the operative text and procedures.

Notes up front: these rules apply only to properties inside the County’s unincorporated areas (the County’s Zoning Code is Title 22) — incorporated cities within Los Angeles County use their own zoning ordinances. For how nonconforming zoning interacts with accessory-dwelling-unit permitting, see the ADU rules referenced below. Links in this page point to related County pages for practical topics: parking, design review, development standards, zoning, land use, overlay districts, and the California Building Standards Code.

Controlling ordinance and core rules (plain list)

Title: Title 22 — Planning and Zoning (the County Zoning Ordinance). The zones are listed in § 22.06.010.
Chapter governing nonconforming matters: Chapter 22.172 — Nonconforming Uses, Buildings and Structures (definitions, continuation, repairs, additions, termination, review/extension). See § 22.172.010–§ 22.172.060.
Procedures to extend time or substitute a use: application to the Director and a Type III discretionary review as provided in § 22.172.060.
Repairs / reconstruction after damage: limited restoration allowed when repair costs do not exceed percentage thresholds in § 22.172.020.G and associated subsections.
Termination/amortization schedules: discontinuance rules and multi-tiered time limits appear in § 22.172.050 (ranging from 1 year to multi-decade limits depending on circumstance and building type).
Special provisions: public uses, public utilities, motel conversion allowances, and ADU exceptions are specifically called out (see § 22.172.030–§ 22.172.040, and the ADU cross-reference in § 22.172.020.J/M).

District-by-district breakdown (how nonconforming rules interact with common County zones)

Below are representative County zoning districts from § 22.06.010 and the Title 22 sections that govern their development standards — each subsection explains what a nonconforming owner must check for that district. These are County (unincorporated area) zones only.

R-1 (Single-Family Residence)

Purpose & where it applies: R-1 is the County’s basic single-family residential zone as listed in § 22.06.010; R-1 development rules appear in Chapter 22.18 and in zone-specific tables such as § 22.416.040 (CSLA R‑1 example).
Typical permitted uses: single-family homes, certain accessory structures and accessory dwelling units (subject to ADU rules). See Chapter 22.18 and the ADU rules (ADU approvals are not conditioned on correcting an unrelated nonconforming zoning condition in many cases; see cross-reference).
Key dimensional standards (examples): front setback 15 ft, side 5 ft, rear 10 ft, maximum height 35 ft in many R‑1 locations; see Table 22.416.040‑B / § 22.416.040 for a specific CSLA R‑1 example.
How nonconforming rules apply: residential nonconforming uses and buildings may be continued but are subject to the general Chapter 22.172 rules (no enlargement, no increase in occupant load) and the repair/reconstruction thresholds; single‑ and two‑family dwellings have special restoration allowances in some Form‑Based/Specific Plan areas (exceptions in § 22.172.020 and implementing Form‑Based Code provisions).

R-3 (Limited Density Multiple Residence)

Purpose & where it applies: R-3 is for small multi‑family development (see § 22.06.010 and Chapter 22.362 tables).
Typical permitted uses: duplexes, apartment houses, small multi‑family projects (permitted/conditional uses listed in local tables).
Key dimensional standards (quick reference): front setback 15 ft (min), side 5 ft, rear 15 ft, maximum height 35 ft, lot coverage and floor‑area limits are spelled out in Table 22.362.070‑B.
How nonconforming rules apply: the Chapter 22.172 continuation/repair/addition/termination rules govern nonconforming multi‑family structures; extensive repairs that exceed the percentage threshold may trigger requirement to conform (see § 22.172.020.G and § 22.172.020.H).

C-2 / C-3 (Neighborhood / General Commercial)

Purpose & where it applies: C-2 and C-3 are commercial zones listed in § 22.06.010; their development standards are cross‑referenced in Chapter 22.20 and various specific-plan/PASD chapters.
Typical permitted uses: neighborhood retail and services (C-2), larger commercial and mixed uses (C-3). Specific use tables in zone chapters identify ministerial vs conditional uses.
Key standards (examples): many commercial zones have maximum height 35 ft, FAR/lot coverage rules, and parking requirements; yard/setback standards for single‑family residences inside commercial zones are handled via cross‑references in Chapter 22.20.
How nonconforming rules apply: nonconforming commercial uses may continue but may be amortized or subject to termination/discontinuance timelines in § 22.172.050 (for instance, five years in some cases when a nonconforming use is carried on in a conforming structure; other categories have longer or shorter periods). Owners seeking to extend operation past the termination date may apply under § 22.172.060.

M-1 (Light Manufacturing / Industrial)

Purpose & where it applies: M-1 and other industrial zones are listed in § 22.06.010; industrial development standards are in Chapter 22.22 and PASD/Special Area chapters.
Typical permitted uses: light manufacturing, warehousing, limited industrial support uses.
Key dimensional standards (examples): lot coverage and height limits vary by PASD but common maxima include 35–50 ft heights; buffers and screening required where industrial properties abut residential zones (see PASD standards and § 22.318.070.B).
How nonconforming rules apply: existing nonconforming industrial uses are subject to Chapter 22.172; certain industrial zones include their own modifications to nonconforming rules (see zone‑specific sections and PASDs). Maintenance is allowed but enlargements are restricted.

A-1 (Light Agricultural)

Purpose & where it applies: A-1 is the County’s agricultural zone (listed § 22.06.010) and has special accessory and caretaker rules (see § 22.140.140 for caretaker residences).
Typical permitted uses: agricultural operations, accessory residences (caretaker/mobilehome subject to standards), limited support uses.
Key dimensional standards: agriculture has different lot and accessory‑use rules (see Chapter 22.140 and the A‑zone development standards referenced there). Caretaker units and mobilehomes have specified density, lot coverage and access requirements under § 22.140.140.
How nonconforming rules apply: nonconforming agricultural structures follow Chapter 22.172 but several A‑zone specific exceptions apply (repairs/replacement protocols, caretaker/mobilehome repair allowances).

R-R (Resort and Recreation)

Purpose & where it applies: R-R is listed in § 22.06.010 for resort/recreation uses; the Specific Plan / LCP sections (Chapter 22.44) define permitted visitor‑serving uses.
Typical permitted uses: visitor serving facilities, camps, recreation uses, and limited structures associated with recreation.
Key standards: some coastal/visitor‑serving nonconforming provisions limit allowable additions (e.g., no increase in height, footprint controlled, percentage limits on additions); see Part 16 and Section 22.46.560 for coastal visitor‑serving nonconforming rules.
How nonconforming rules apply: visitor-serving nonconforming structures have stricter Cap/limit rules (e.g., additions limited to 25% of existing floor area in Two Harbors Resort Village District) and some exemptions from broader Title 22 nonconforming repair rules.

Quick reference table — core nonconforming rules (decision‑relevant)

Rule / Question	Short answer (County Title 22)	Code Reference
May a legally established nonconforming use continue?	Yes — continuation allowed so long as there is no enlargement, increase in occupant load, or expansion of area devoted to the use, unless otherwise authorized.	§ 22.172.020.A
May I add to a nonconforming building or expand the nonconforming use?	Generally no; limited exceptions (residential additions, seismic retrofits, required by later law).	§ 22.172.020.B–C, G
If a nonconforming building is damaged, can I rebuild?	Yes, subject to cost thresholds: partial repairs allowed; rebuilding allowed under set thresholds (50% or 100% in specific contexts) — above thresholds may require conformity.	§ 22.172.020.G
When does a nonconforming use terminate for discontinuance?	Discontinuance for two consecutive years typically terminates rights; different categories have statutory “operation of law” termination periods varying from 1 year to multi-decade schedules.	§ 22.172.050.A–B
Can the County extend the amortization / termination period?	Yes — owner may apply for extension or substitution under § 22.172.060; the review is a Type III discretionary process with findings.	§ 22.172.060
Do public utilities or public uses get special treatment?	Public uses and public utilities may be added to or altered if they stay within original site boundaries; see narrow exceptions.	§ 22.172.030–040
Do ADU approvals require correcting a nonconforming zoning condition?	Generally no — ADU approvals are not conditioned on correcting unrelated nonconforming zoning conditions when the zone allows residential use (State ADU law compatibility is cited in Title 22).	§ 22.140.640.K–L

Practical guidance & synthesis (plain-English, but ordinance‑grounded)

Continuation vs expansion: you can keep running an existing nonconforming use in the unincorporated County, but you cannot enlarge the use or add new land/buildings to support it unless an exception applies; this is the fundamental restriction in § 22.172.020.
Repair thresholds matter: if repairs within 12 months exceed 25% of the building’s market value (or other thresholds in § 22.172.020.G), the County can require the rebuilt work to comply with current standards. Get an appraisal early.
Damage/rebuild numeric tests: different thresholds and methods (assessment roll vs. narrative appraisal) are provided for determining allowed restoration; these are technical and administered by the Director. See § 22.172.020.G for the appraisal and cost rules.
Amortization schedule: some nonconforming uses are subject to firm termination dates by operation of law (e.g., 1–5 years for certain unimproved conditions; longer schedules for structures based on building type). Consult § 22.172.050 early to determine your category.
Apply for review to extend: if you need to keep the use beyond an automatic termination date, file under § 22.172.060 (Type III discretionary review). The County considers constitutional takings and neighborhood impacts in its findings.
Interactions with specialized zones and overlays: Specific Plans, PASDs, Community Standards Districts, and the Green Zone may add or modify rules; check the applicable specific‑plan chapter because those rules can supersede Chapter 22.172 in certain respects (see the Form‑Based Code and Specific Plan cross‑references).
Related approvals to check: changes may trigger parking review (parking), design review (design review), or variances (variances and exceptions). If the structure touches life/safety systems you will also need to meet the California Building Standards Code and local Building & Safety review.

Checklist — what an applicant (owner) must satisfy to preserve or extend a nonconforming use

Identify the nonconforming status (use vs. structure vs. standards) and document lawful establishment date using permits/records. Verify zone from § 22.06.010.
Check whether the proposed work is pure maintenance (allowed) or exceeds maintenance thresholds (§ 22.172.020.H) — obtain a market‑value appraisal if repair costs approach thresholds.
If rebuilding after damage, calculate % of market value vs. thresholds in § 22.172.020.G and prepare appraisal/assessment documentation.
Confirm any applicable Special Plan, PASD, or Green Zone rules that modify Chapter 22.172 (see relevant specific‑plan chapter).
If seeking extension of time or substitution of use, prepare a Type III application and the Nonconforming Review Checklist required by § 22.172.060.
Prepare findings and operation/maintenance plans showing no adverse health, safety, or welfare impacts (these are the required findings under § 22.172.060.C.2).
Anticipate conditions of approval (parking, landscaping, screening — see development standards, parking, landscaping and screening).

Risks & Ambiguities

Issue	Why it matters	What to verify
Repair cost threshold measurement	Exceeding the percentage threshold may force full conformance (loss of nonconforming status).	Verify market‑value method used by Director (assessment roll vs. narrative appraisal) per § 22.172.020.G.
Which amortization period applies	Different categories (unimproved lot, small structures, signs, building type) have different statutory timelines.	Determine category in § 22.172.050; verify which sub‑paragraph fits your case.
Specific Plan / PASD overrides	Specific Plans or PASDs can alter nonconforming rules and development standards.	Confirm applicable Specific Plan or PASD and the cross‑references (e.g., Form‑Based Code, Chapter cross‑references). See § 22.172.020 cross‑references and specific plan tables.
Green Zone special timelines	“Green Zone” nonconforming uses have unique termination dates and restrictions.	If property is in a Green Zone, review Chapter 22.84 and § 22.172.050.B.3 for fixed termination dates.
ADU interactions	State ADU law limits conditioning ADU approval on correction of nonconforming zoning conditions.	Confirm ADU exception language in § 22.140.640.K–L and cross‑check State ADU statutes.
Director discretion on appraisals and value	The Director may order independent appraisals and the Director’s market‑value determination is final for repair tests.	Obtain pre‑application meeting and clarify appraisal expectations per § 22.172.020.G.1.

Plain-English Summary (homeowner)

If you legally established a use or building in the unincorporated areas before current rules changed, you can usually keep using it, but you cannot expand it or rebuild it in a way that increases the nonconforming aspects unless the County lets you. Small repairs are OK, but if repair/rebuild costs pass specific percentage thresholds the County can require you to bring the building into conformance; sometimes the County will set an end date for the nonconforming use unless you successfully apply for an extension. See Chapter 22.172 for the exact tests.

Information Gaps / Things not confirmed in the retrieved materials

Exact numeric maintenance threshold language varies by context (some text cites 25% within a 12‑month period — see § 22.172.020.H — but local exceptions can exist in specific plans). Confirm applicability to your parcel.
Parcel‑specific historic permits, prior Zone Exceptions, or pre‑1971 approvals may change whether a use is treated as nonconforming or as having a fixed conditional grant — those situations require file‑level review (not present in the retrieved extracts). See § 22.246.010.D for zone‑exception conversions.
Any recent local amendments after the version(s) in the provided Title 22 export may alter deadlines (some files show multiple recent ordinances); verify with County Planning records. Not found in retrieved materials: a consolidated, parcel‑specific status determination.

Source References

Title 22 — Planning and Zoning, Table of Zones: § 22.06.010.
Chapter 22.172 — Nonconforming Uses, Buildings and Structures: § 22.172.010 – § 22.172.060 (definitions, continuation, repairs, additions, termination, review).
Repair/reconstruction appraisal and percentage thresholds: § 22.172.020.G.
Termination conditions and time limits (amortization schedule categories): § 22.172.050.
Nonconforming review / extension procedures: § 22.172.060.
R‑1 development standard example and CSLA table: § 22.416.040 and Table 22.416.040‑B.
R‑3 development standards (Zone R‑3 tables): Table 22.362.070‑B (see Chapter 22.362).
Commercial / mixed‑use development references and PASD rules: § 22.20.050, § 22.318.070 (PASD standards), and Chapter references.
Caretaker/mobilehome standards in A‑zones and related development standards: § 22.140.140.
ADU cross‑reference: § 22.140.640 (ADU exceptions regarding nonconforming zoning conditions).

(If you want direct, parcel‑level application of these provisions I can prepare the specific code excerpts that matter for your parcel — or draft the documents you’d submit for a § 22.172.060 extension application. Verify all items with the County Director/Planning staff and consult the full Title 22 text linked above in your pre‑application.)

Sources

Retrieved passages

Los Angeles County Zoning Code (Section 22.110.130) High relevance
CBC § 33 (Chapter 22.172) High relevance
CBC § 1 (Title 22) High relevance
CBC § 22.114.040 (Title 22) High relevance
Los Angeles County Zoning Code (Chapter 22.172) High relevance
Los Angeles County Zoning Code (Section 22.172.050.B) High relevance
CBC § 1 (§ 1) High relevance
Los Angeles County Zoning Code (Title 22) High relevance
Los Angeles County Zoning Code (§ 66314) Medium relevance
CBC § 1 (§ 1) Medium relevance
Los Angeles County Zoning Code Medium relevance
Los Angeles County Zoning Code (Title 22) Medium relevance
CFC § 22.114.180 (Chapter 22.114) Medium relevance
Los Angeles County Zoning Code (title and) Medium relevance
Los Angeles County Zoning Code (Section 22.158.050.B) Medium relevance
Los Angeles County Zoning Code (Title 22) Medium relevance
Los Angeles County Zoning Code (Section 22.172.050.B) High relevance
Los Angeles County Zoning Code (Section 22.112.120) Medium relevance
Los Angeles County Zoning Code (§ 1) Medium relevance
Los Angeles County Zoning Code (Section 11362.768) Medium relevance
Los Angeles County Zoning Code (Title 22.) Medium relevance
Los Angeles County Zoning Code (Section 22.362.060.L) Medium relevance
Los Angeles County Zoning Code (Section 22.362.060.L) Medium relevance

Cited sections

Official Los Angeles County code library

Frequently asked questions

What is a nonconforming use in unincorporated Los Angeles County?

A nonconforming use is a use, building, or structure that was lawfully established but no longer meets current Title 22 zoning standards. The County’s rules for continuation, repair, expansion, and termination are in § 22.172.010–§ 22.172.060; continuation is permitted but enlargement is generally prohibited.

How long can a nonconforming commercial use continue in unincorporated County areas?

Time limits depend on the category in § 22.172.050 — some situations (unimproved lots) have a 1‑year termination, some signs 5 years, and other buildings may have extended schedules tied to building type (20+ years or life‑of‑type rules). Check the specific subparagraph in § 22.172.050 that fits your case.

If my nonconforming building was damaged, can I rebuild it?

Possibly. Repairs and partial reconstruction are allowed provided reconstruction costs do not exceed thresholds set in § 22.172.020.G (the Code lists appraisal methods and percentage cutoffs). If repairs exceed thresholds you may be required to bring the building into conformance.

Can I add on to a nonconforming use or a nonconforming building?

Generally no. § 22.172.020.B–C prevents expansion or enlargement of nonconforming uses or structures except for limited exceptions (e.g., some residential additions or required seismic retrofits). Always confirm with the Director.

What options does an owner have if the County sets a termination date?

Owners can apply to the Director under § 22.172.060 for an extension of time or substitution of an allowed use; that application is processed as a Type III discretionary review and requires findings showing no undue harm and (in some instances) avoidance of an unconstitutional taking.

Does the County require ADUs to fix nonconforming conditions first?

No. Title 22 explicitly states that an ADU or JADU approved under § 22.140.640 may be developed on a lot containing a nonconforming single‑family or multi‑family residence without requiring correction of the nonconforming condition where the zone allows residential uses (consistent with State ADU law). Confirm ADU exceptions in § 22.140.640.K–L.

If I stop operating a nonconforming use, does that terminate my rights?

Yes — discontinuance rules in § 22.172.050.A indicate that discontinuing the use for two consecutive years generally terminates the right to resume the nonconforming use (subject to some exceptions and extensions). Confirm your category in § 22.172.050.

Are there special rules for public uses or utilities that are nonconforming?

Yes. Publicly owned nonconforming uses (schools, parks, fire stations, etc.) and utility facilities may be altered or added to within the boundaries of the original site without being forced to terminate under certain conditions; see § 22.172.030–040.

What is the County’s test for whether repairs force conformity?

If maintenance/repairs within any 12‑month period exceed 25% of the building’s market value for certain nonconforming structures, the building must be brought into conformance. The valuation method and appeals process are described in § 22.172.020.H and § 22.172.020.G.

Where do I find specific yard, height and parking standards that interact with nonconforming rules?

Look up the applicable zone in § 22.06.010, then follow to the zone’s development standards chapter or table (for example, § 22.362.070 for R‑3, § 22.416.040 for CSLA R‑1), and see Chapter 22.112 for parking. Nonconforming rules remain in Chapter 22.172.

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