San Gabriel — Nonconforming Uses

Last reviewed: July 2, 2026

Overview

San Gabriel regulates nonconforming uses, nonconforming structures, and nonconforming lots in a dedicated subchapter of the Zoning Code. The rules define when a formerly lawful use/structure/lot may continue, what actions terminate nonconforming rights, and what relief (variance/CUP) is available; the primary rules are in § 153.420–§ 153.427 of the San Gabriel Zoning Code.

What the code requires (core rules)

• A use or building that was lawful when established but later conflicts with zoning is a nonconforming use, nonconforming structure, or nonconforming lot; definitions are in § 153.420.
• Continuation: Nonconforming uses and structures may generally be continued, but cannot be enlarged, intensified, or altered in a way that increases the nonconformity (repairs for structural integrity excepted). See § 153.421 and § 153.422.
• Discontinuance and termination: A nonconforming use right ends if the use is discontinued for 120 consecutive days (special rules apply for massage establishments—see § 153.427). § 153.421(A)(5).
• Involuntary destruction: If a nonconforming structure is involuntarily destroyed, the use/structure must be reestablished within 120 days or the nonconforming right terminates; reconstruction may also be limited when rebuild cost exceeds 50% of replacement cost (appraiser to determine cost). See § 153.421(A)(7) and § 153.422(D)(6).
• Nonconforming lots: Improved nonconforming lots generally may not receive additional structures; R-1 and R-1A lots have specific exemptions — see § 153.423.
• Enforcement and appeal: The Community Development Director enforces terminations and must notify owners; owners have 30 days to appeal to the Director, then may appeal Director decisions to City Council per § 153.424.
• Relief: Owners may seek a conditional use permit and/or variance from the Planning Commission where the subchapter allows relief (see § 153.425).

Note on parking when changing uses: when a nonconforming use is changed to another use, the applicant must meet the parking requirements in effect for the proposed use (see § 153.421(A)(6)). For San Gabriel parking policies, consult the local parking rules.

(For related development standards such as setbacks, lot coverage and numerical standards see the San Gabriel Development Standards and the ADU rules discussed below. Link references are provided throughout for quick navigation.)

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

Below are the City’s commonly used zoning districts and the specific nonconforming interactions called out in the ordinance. For each district I summarize purpose, typical uses, known dimensional standards that appear in the code excerpts retrieved, and where the district is used in the City. Where a numeric standard was not available in the retrieved excerpts I mark it as Not found in retrieved materials and advise to verify with the jurisdiction.

R-1 (Single-Family Residence)

• Purpose: Preserve single-family scale and neighborhood character.
• Typical permitted uses: single-family dwellings, accessory structures, home occupations (see full § for complete list). Not all permitted-use lists were included in the retrieved snippets. Not found in retrieved materials for full use table.
• Key dimensional standards (from retrieved materials): front yard setback example for the "urban dwelling" provisions shows 20 ft front setback and two-story/28 ft limit for certain urban dwelling contexts; consult applicable zone section for exact R-1 numeric standards.
• Nonconforming interaction: Legally existing nonconforming lots in R-1 and R-1A are expressly exempt from the nonconforming-lot subchapter except as otherwise provided — see § 153.423(B). Nonconforming residential structures in residential zones may be rebuilt if reconstruction cost does not exceed 50% threshold (with exceptions for R-1/R-1A reconstructed after involuntary destruction).

R-1A (Limited Two-Family Residence)

• Purpose & typical uses: limited two-family/doubling of residential intensity in appropriate areas; specific uses appear in the R-1A use table. Not found in retrieved materials for full use table.
• Key dimensional standards: Not found in retrieved materials (verify with the development standards).
• Nonconforming interaction: Same R-1 lot exemption applies in § 153.423(B).

R-2 (Low Density Multiple-Family Residence)

• Purpose: Manage multi-family scale, light, ventilation, and open space. § 153.079–§ 153.083 contains R-2 rules.
• Typical permitted uses: uses permitted in R-1 and R-1A, plus group dwellings and multiple-family dwellings; ADUs allowed per ADU section. § 153.080.
• Key dimensional standards: maximum building height of two stories or 35 ft in R-2 § 153.081; minimum lot area rules in § 153.082.
• Nonconforming interaction: The general nonconforming structure rules apply; the code says passage of time alone does not terminate nonconforming residential structures in multi-residential zones unless City Council decides otherwise. § 153.422(A)(5).

R-3 (Higher-density Residential)

• Purpose & uses: multiple-family dwellings and related residential uses. Specific R-3 rules and uses: Not fully included in retrieved snippets — verify with the jurisdiction for full list. Not found in retrieved materials for full R-3 use table.
• Nonconforming interaction: Nonconforming residential protections in § 153.422 apply; the code specifically references multi-residential zones not being terminated solely by passage of time absent City Council action.

C-1 (Retail Commercial) and C-3 (Commercial & Light Manufacturing)

• Purpose: commercial retail (C-1) and broader commercial/light manufacturing (C-3). Specific permitted uses appear in their respective use tables — Not found in retrieved materials for full lists.
• Nonconforming interaction: Nonconforming uses in nonresidential zones may be continued but if a structure in a nonresidential zone is entirely unoccupied for 6 consecutive months the nonconforming status terminates (§ 153.422(C)(1)). Changes to a different use must meet current requirements including parking (see § 153.421(A)(6)).

M-1 (Light Manufacturing) and P-1 (Automobile Parking)

• Purpose & typical uses: industrial/light manufacturing in M-1; parking uses in P-1. These are also listed as nonresidential zones in the nonconforming definitions.
• Nonconforming interaction: Same continuation and termination provisions apply; specific provisions in § 153.422 and § 153.423 are zone-general.

D (Architectural Design Zone)

• Purpose: architectural control/design emphasis; identified as a nonresidential zone in the nonconforming definitions.
• Nonconforming interaction: Nonconforming commercial/architectural-design structures follow the same continuation rules; design review or modifications to a nonconforming structure may still require compliance with design rules — verify with San Gabriel Design Review procedures.

MF (Medical Facilities Zone)

• Purpose: specifically created Medical Facilities Zone and map depiction on the Official Zoning Map. § 153.310–§ 153.313.
• Typical permitted uses: Hospitals, convalescent facilities, medical clinics, medical labs, pharmacies, medical/dental offices, limited retail within medical structures, parking structures, nursery schools/daycare, accessory buildings. § 153.312 lists permitted uses.
• Key dimensional standard in the retrieved text: buildings in the MF Zone are capped in height in § 153.313 (the code text retrieved reads "Buildings in the Medical Facilities Zone shall not be more than seventy (701) feet in height" — verify the exact numeric formatting with the City; see Risks & Ambiguities).
• Nonconforming interaction: A parcel included in MF by rezoning may retain the rights and restrictions that existed under its previous zone until the use converts or structure is altered to conform; see § 153.311.

Mission District Specific Plan & Valley Boulevard Specific Plan

• These are specific-plan zoning designations mapped on the Official Zoning Map. The Mission District SP and the Valley Boulevard SP each have their own rules; Mission District includes R-1V, etc. Nonconforming rules in the general subchapter can be superseded by specific plan provisions (e.g., the Mission District specific plan contains its own nonconforming treatment). See each plan’s creating section and the MF special rule noted above § 153.300–§ 153.311.

Decision-relevant quick table

Practical guidance & synthesis (plain-English interpretation)

• You may continue a lawful but now-nonconforming use or building in San Gabriel so long as you avoid any enlargement or intensification (no adding floor area, no adding seats/customers, etc.). Repairs and safety-mandated changes are allowed, but anything that increases nonconformity triggers loss of the protection. § 153.421 and § 153.422.
• If you voluntarily shut down your nonconforming business or remove the use for 120 days, the right to resume is lost — plan temporary closures carefully. § 153.421(A)(5).
• If a nonconforming building is destroyed by events outside the owner’s control, you generally must rebuild promptly and keep reconstruction cost under the 50% threshold to maintain status — the Community Development Director uses an appraiser to make that call. § 153.422(D)(5)–(6).
• When converting a nonconforming commercial use to a permitted use, expect to meet current code requirements for that new use — especially parking. The ordinance explicitly requires current parking requirements be satisfied when a nonconforming use changes use. § 153.421(A)(6). (See San Gabriel Parking for details.) San Gabriel Parking
• For accessory dwelling units (ADUs), the City’s ADU rules contain their own standards and specify that ministerial ADU approvals cannot be conditioned on correcting nonconforming zoning conditions that do not threaten health/safety — see the ADU subsection and state law cross-references. Verify the ADU section and state ADU law for interactions between ADU approvals and nonconforming conditions. § 153.047-style ADU provisions and local ADU text. San Gabriel ADUs California ADU law

Checklist — what an applicant (owner) must satisfy before claiming nonconforming rights or requesting relief

• Confirm the use/structure/lot was lawful at the time it was established and identify the ordinance that made it nonconforming (definition review). § 153.420
• Do not enlarge or intensify the nonconforming use or structure (repairs allowed only). § 153.421
• If proposing a change of use, demonstrate compliance with today's standards for the proposed (conforming) use including parking. § 153.421(A)(6) San Gabriel Parking
• If claiming reconstruction after involuntary destruction, obtain a cost appraisal (owner pays) to show rebuild cost ≤ 50%, and start reconstruction within the time limits set by the code. § 153.422(D)(6)
• If facing termination notice, file an appeal to the Community Development Director within 30 days, then be prepared to appeal to City Council within the code’s time windows. § 153.424
• If seeking relief, prepare an application for a variance or conditional use permit to the Planning Commission and reference § 153.425.
• Review related disciplines that could be triggered by work (design review, San Gabriel Design Review, San Gabriel Development Standards, and the California Building Standards Code); permits must still meet safety and building code requirements. Not all building-code remedies are in the zoning code.

Risks & Ambiguities

Plain-English Summary

If your property or business was lawful when it started but now conflicts with San Gabriel’s zoning, you usually can keep operating — but you may not enlarge, intensify, or abandon it for long (120 days) without losing the right. If a nonconforming building is badly damaged, rebuilding depends on cost thresholds and timing; you can seek a variance or conditional-use permit if needed. (For specifics, see § 153.420–§ 153.427.)

Source References

• San Gabriel Zoning Code, definitions and nonconforming rules, § 153.420.
• San Gabriel Zoning Code, continuation of nonconforming uses, § 153.421.
• San Gabriel Zoning Code, continuation of nonconforming structures, § 153.422.
• San Gabriel Zoning Code, continuation of nonconforming lots, § 153.423.
• San Gabriel Zoning Code, notification/appeal procedures, § 153.424.
• San Gabriel Zoning Code, request for relief (CUP/variance), § 153.425.
• San Gabriel Zoning Code, enforcement, § 153.426.
• San Gabriel Zoning Code, massage establishment amortization, § 153.427.
• Medical Facilities Zone (MF), permitted uses and height rule, § 153.310–§ 153.313.
• ADU regulations and nonconforming interactions (San Gabriel ADU subsection), ADU development standards and the local rule that ministerial ADU approvals cannot require correction of nonconforming conditions that do not threaten health and safety. Noted in the ADU subsection excerpts.
• R-2 zone purpose, uses and basic dimensional rules, § 153.079–§ 153.083.

Retrieved passages

• San Gabriel Zoning Code (chapter applicable) High relevance show source text
• San Gabriel Zoning Code (§ 153.422) High relevance show source text
• San Gabriel Zoning Code (§ 153.423) High relevance show source text
• San Gabriel Zoning Code (§ 153.425) High relevance show source text
• San Gabriel Zoning Code (§ 153.423) High relevance show source text
• San Gabriel Zoning Code (§ 153.403) High relevance show source text
• San Gabriel Zoning Code (§ 153.424) High relevance show source text
• CBC § 153.422 (§ 153.422) High relevance show source text
• San Gabriel Zoning Code (§ 66314) Medium relevance show source text
• CBC § 66314 (§ 66314) Medium relevance show source text
• CBC § 66321 (§ 66321) Medium relevance show source text
• San Gabriel Zoning Code (§ 21155) Medium relevance show source text
• CBC § 150 Medium relevance show source text
• San Gabriel Zoning Code Medium relevance show source text
• CBC § 65852.22 (§ 65852.22.) Medium relevance show source text
• San Gabriel Zoning Code Medium relevance show source text

Cited sections

• San Gabriel Zoning Code, definitions and nonconforming rules, **§ 153.420**. (§ 153.420)
• San Gabriel Zoning Code, continuation of nonconforming uses, **§ 153.421**. (§ 153.421)
• San Gabriel Zoning Code, continuation of nonconforming structures, **§ 153.422**. (§ 153.422)
• San Gabriel Zoning Code, continuation of nonconforming lots, **§ 153.423**. (§ 153.423)
• San Gabriel Zoning Code, notification/appeal procedures, **§ 153.424**. (§ 153.424)
• San Gabriel Zoning Code, request for relief (CUP/variance), **§ 153.425**. (§ 153.425)
• San Gabriel Zoning Code, enforcement, **§ 153.426**. (§ 153.426)
• San Gabriel Zoning Code, massage establishment amortization, **§ 153.427**. (§ 153.427)
• Medical Facilities Zone (MF), permitted uses and height rule, **§ 153.310–§ 153.313**. (§ 153.310)
• ADU regulations and nonconforming interactions (San Gabriel ADU subsection), ADU development standards and the local rule that ministerial ADU approvals cannot require correction of nonconforming conditions that do not threaten health and safety. Noted in the ADU subsection excerpts.
• R-2 zone purpose, uses and basic dimensional rules, **§ 153.079–§ 153.083**. (§ 153.079)
• SanGabriel_ZoningCode.md

• Official San Gabriel code library