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San Gabriel — Development Standards

Development Standards under the San Gabriel local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

This page summarizes the San Gabriel Municipal Code rules that control development standards — setbacks, height, lot coverage, density and FAR — as applied by the City’s zoning map and zoning districts. It is focused on what the San Gabriel zoning ordinance itself requires (not Title 24 building-code details). For zoning map context see San Gabriel zoning & planning overview and the city's zoning map. For related topics referenced below see the city's pages on parking, ADUs, design review, overlay districts, landscaping and screening, and California Building Standards Code.

This page is strictly limited to development standards found in the San Gabriel Zoning Code (Title 153 of the San Gabriel Municipal Code). Each numeric requirement below is cited to the municipal code (§ + number) and the source file from the retrieved ordinance.

How to read this page

  • Bolded terms are the exact zoning district names or numeric standards that appear in the code (for easy scanning).
  • Each district subsection gives purpose, typical permitted uses, and the most-used dimensional standards (setbacks, heights, lot coverage, FAR or density) with the controlling code citation.
  • Where the Code specifies tables (for example C-1/C-3 development standards) I reproduce the decision-relevant rows in a condensed table and give the § citation.

District-by-district standards

R-1 — Single‑Family Residence Zone

  • Purpose & typical uses: residential single‑family uses; standards intended to preserve scale, light and privacy. See the zone list and purpose statements in the zoning code (§ 153.015; purpose language is applied across the residential zones) § 153.015 .
  • Key dimensional rules:
    • Lot coverage: maximum 35% of net lot area in single‑family residence zones (§ 153.042) § 153.042 .
    • FAR (single‑family with a second story): a single‑family dwelling with more than one story is limited to 0.35 FAR; interior spaces over 12 feet count double (§ 153.043) § 153.043 .
    • Setbacks / height control by angled‑plane: second‑story height must fall within a 45° angled plane from the front and side (ten feet above side property lines) and a 35° rear plane; second‑story linear walls require articulation every 25 feet (§ 153.040 and related diagrams) § 153.040 .
    • Accessory structures & separation: detached accessory buildings (including detached ADUs) must be at least 6 ft from other accessory buildings or the main building; minimum 4 ft between eave overhangs, etc. (§ 153.041) § 153.041 .
    • Second‑story footprint: second‑story floor area must be 25% less than the first floor (§ 153.065) § 153.065 .

Where this matters practically: additions that increase FAR above 0.35 or extend second‑story gross area beyond the 25% reduction rule will be non‑compliant without a variance (§ 153.043, § 153.065) § 153.043 § 153.065 .

R-1A — Limited Two‑Family Residence Zone

  • Purpose & uses: allows duplex/limited two‑family uses but generally applies R‑1 single‑family dimensional standards to new single‑family dwellings in R‑1A (§ 153.015 and § 153.062) § 153.015 § 153.062 .
  • Key dimensional rules:
    • Minimum separation between main buildings: 20 ft between detached main buildings on the same site; accessory buildings: 6 ft separation; lot coverage rules for single‑family tracks are the same as R‑1 (§ 153.062, § 153.063) § 153.062 § 153.063 .
    • FAR for two‑story single family: same 0.35 FAR rule applies for single‑family dwellings (see § 153.064/153.065) § 153.064 .

R-2 — Low Density Multiple‑Family Residence Zone

  • Purpose & typical uses: small multi‑unit residential projects (garden apartments, duplexes) intended to fit residential scale and provide open space (§ 153.079) § 153.079 .
  • Key dimensional rules:
    • Lot coverage: 35% maximum for single‑family-style development; accessory surfaces counted toward coverage (§ 153.063) § 153.063 .
    • Distance between buildings: 20 ft between detached main buildings on same site; accessory buildings 6 ft (§ 153.086) § 153.086 .
    • Open space: multi‑family developments must show recreational/leisure areas and minimum square‑footage per bedroom as required by § 153.089/153.089(B) (§ 153.089) § 153.089 .
    • Many R‑2 single‑family units must conform to R‑1 standards for second‑story FAR/coverage (§ 153.091) § 153.091 .

R-3 — Multiple‑Family Residence Zone

  • Purpose & uses: higher density multi‑family (group dwellings, apartments); R‑3 permits R‑1/R‑2 uses plus multiple‑family uses (§ 153.100) § 153.100 .
  • Key dimensional rules:
    • Height limit: maximum 3 stories or 35 ft (§ 153.101) § 153.101 .
    • Minimum site area/density: minimum lot and site area provisions for per‑unit density are codified (see § 153.102) § 153.102 .
    • Single‑family units in R‑3 must comply with R‑1 single‑family development standards (§ 153.100(D)) § 153.100 .
    • ADUs: allowed per local ADU rules (§ 153.047 cross‑references) § 153.100(E) .

C‑1 / C‑3 — Retail Commercial / Commercial & Limited Manufacturing Zones

  • Purpose & uses: retail, office, commercial services; C‑3 allows limited manufacturing. Mixed‑use rules overlay with these zones (§ 153.155, § 153.164) § 153.155 § 153.164 .
  • Key dimensional rules (condensed from TABLE 153.155):
    • Max building height: 5 stories / 70 ft (whichever is lower) for C‑1 and C‑3; M‑1 is generally 2 stories / 35 ft (§ 153.155) § 153.155 .
    • Front yard: 0 ft (but front setback may be required through Precise Plan of Design or CUP) (§ 153.155) § 153.155 .
    • Side & rear yards: variable — e.g., side yard 0 ft when abutting C‑1/C‑3/M‑1; 5–10 ft when abutting other zones (§ 153.155) § 153.155 .
    • Maximum FAR: 0.5 in C‑1, 0.7 in C‑3 (FAR may increase for mixed‑use; see § 153.164 and mixed‑use subchapter) (§ 153.155) § 153.155 .

See the condensed table below for quick reference.

Mixed‑Use in C‑1/C‑3 — § 153.164 and mixed‑use development standards

  • Purpose: to allow compatible combination of commercial/office and residential uses in the same structure/site (§ 153.164(A)) § 153.164 .
  • Permitted uses: multi‑family residential allowed only on 2nd and 3rd floors above ground‑floor commercial/office; ground‑floor residential only for very large sites (over 3 acres) (§ 153.164(B)) § 153.164 .
  • Development standards (high‑priority rules to check early):
    • Parking: residential units require 1 space per bedroom; guest parking 1 per 3 units; standards reference the off‑street parking chapter (§ 153.164(C)(1) and § 153.220) § 153.164 § 153.220 .
    • Density / minimum site area: where abutting R‑1/R‑2: minimum 3,960 sq ft net lot area per multi‑family unit; elsewhere 1,452 sq ft per unit (§ 153.164(C)(2)) § 153.164 .
    • FAR: maximum 1.0 FAR for entire mixed‑use development; multi‑family must be 25–50% of net lot area (§ 153.164(C)(3)) .
    • Lot coverage: 55% where abutting R‑1/R‑2; 60% where abutting other zones (§ 153.164(C)(4)) .
    • Height: where abutting R‑1/R‑2: 2 stories / 35 ft; otherwise 3 stories / 45 ft (§ 153.164(C)(5)) .
    • Setbacks: commercial floors may have 0 ft front setback (but a Precise Plan of Design or CUP can require setbacks); residential floors must step back minimum 5 ft beyond commercial floors; side yard 10 ft when abutting residential zones; rear yard 15 ft (§ 153.164(C)(6)–(8)) .

Practical note: mixed‑use projects are explicitly required to comply with C‑1/C‑3 development standards except as modified by the mixed‑use subchapter — verify both § 153.155 and § 153.164 early in project planning (§ 153.155, § 153.164) § 153.155 § 153.164 .

MF — Medical Facilities Zone

  • Key rules: maximum gross building area set as 3x site area (§ 153.315); setbacks are specific (Las Tunas Drive 0 ft; other streets 5 ft) and interior setbacks are a function of adjacent zone and building height (special stepbacks above 30 ft) (§ 153.316) § 153.315 § 153.316 .
  • Parking: parking ratios set at at least 4 spaces / 1,000 sf gross floor area for typical medical facilities, with exceptions for hospitals (§ 153.317) § 153.317 .

P‑1 Automobile Parking Zone / Surface parking standards

  • Surface parking development standards include front yard 5 ft, side yard 5–6 ft depending on abutting zone, rear yard 0–10 ft depending on abutment, masonry walls where parking abuts residential, landscaping and irrigation in required setbacks, and limits on signage (§ 153.174) § 153.174 .

Quick reference table (decision‑relevant standards)

District Height Lot coverage / FAR (typ.) Setbacks (typical) Density / min site area Code Reference
R‑1 2 stories (angled plane); second‑story limits apply 35% lot coverage; 0.35 FAR for >1 story Angled plane 45° front/side; 35° rear; accessory sep 6 ft Not expressed as units; see site rules § 153.040, § 153.042, § 153.043
R‑2 2–3 stories (contextual) 35% lot coverage (single‑family baseline) Distances between buildings 20 ft; accessory 6 ft Multi‑family open space rules apply (§ 153.089) § 153.063, § 153.086, § 153.089
R‑3 3 stories / 35 ft max Multi‑family standards; see R‑1 for single‑family within R‑3 Follows R‑1 for single‑family standards; site area/min unit rules apply Min site area 1,742 sf / unit for family dwelling units (see § 153.102) § 153.101, § 153.100, § 153.102
C‑1 / C‑3 5 stories / 70 ft (whichever is lower) FAR 0.5 (C‑1), 0.7 (C‑3) (mixed‑use allowances may change FAR) front 0 ft (precise plan may require setback); side/rear vary (0–15 ft) No minimum lot size for C‑1/C‑3 (see § 153.155) § 153.155, § 153.164
Mixed‑Use (C‑1/C‑3) 2–3 stories depending on abutting zone (35–45 ft) Lot coverage 55–60%; max FAR 1.0 for entire development Residential floors +5 ft beyond commercial; side 10 ft if abutting residential; rear 15 ft Min 3,960 sf/unit when abutting R‑1/R‑2; 1,452 sf/unit otherwise § 153.164
MF (Medical) Stepbacks above 30 ft; see table Building area ≤ 3x site area (§ 153.315) Setbacks special (Las Tunas 0 ft; others 5 ft); interior depends on adjacency & height Min site area rules for hospital/SRO in other sections § 153.315–318

Checklist

An applicant should verify and document the following before design or building permit submittal:

  • Confirm the zoning district on the City’s zoning map (zone list: R‑1, R‑1A, R‑2, R‑3, C‑1, C‑3, M‑1, P‑1, MF, etc.) (§ 153.015) § 153.015 .
  • Calculate proposed lot coverage and FAR against the district limits (e.g., 35% / 0.35 in R‑1; C‑3 FAR 0.7 etc.) (§ 153.042, § 153.043, § 153.155) § 153.042 § 153.043 § 153.155 .
  • Demonstrate setbacks and angled‑plane compliance for second‑story massing; show eave and projection allowances (§ 153.040–153.041) § 153.040 § 153.041 .
  • For multi‑family or mixed‑use projects: show parking program consistent with Chapter on Parking and with mixed‑use rules (guest parking, 1 space/bedroom standard where applicable) (§ 153.220, § 153.164) § 153.220 § 153.164 .
  • If proposing ADUs, follow the ADU standards (size limits, setbacks, ministerial timelines) and note where local rules interact with state ADU law (§ 153.047 and related ADU divisions) (§ 153.047 and ADU subparts) § 153.047 .
  • Provide landscape and buffer plans meeting § 153.535 landscaping/buffer yard requirements (trees per 100 ft, Type 1/2 buffer widths, planter minimums) and parking lot screening (§ 153.535) § 153.535 .
  • Confirm whether the project triggers objective design review standards (see § 153.134) and whether a Precise Plan of Design or Conditional Use Permit is required for exceptions (§ 153.134, § 153.355 references in code) § 153.134 .
  • Identify any overlays on the parcel (e.g., PD, MD, MF, Historic overlays) and apply overlay‑specific development standards or historic‑preservation constraints (§ 153.015 map and overlay listings) § 153.015 .
  • Verify fire access / fire‑lane and sprinklers requirements early (fire code references in the Municipal Code) — see the municipal sections that cross‑reference the Fire Code and the Building Code (§ 150.x and chapter references) § 153.133 .

Risks & Ambiguities

Issue Why it matters What to verify
Mixed‑use thresholds and FAR interplay Mixed‑use subchapter modifies C‑1/C‑3 standards (FAR, coverage, height) — small errors in calculating mixed‑use FAR or % residential can knock a project out of compliance Confirm which mixed‑use subsection applies (see § 153.164) and provide a mixed‑use area breakdown early (§ 153.164) § 153.164
ADU local vs. state interactions State ADU law limits how some local standards can be applied (size, setbacks, ministerial review); local code also contains ADU provisions — conflicts possible Use the city ADU provisions and confirm state ADU constraints listed in city ADU divisions; verify ministerial timelines (§ 153.047 and related ADU text) § 153.047
Setback diagrams / angled‑plane interpretation Angled‑plane rules reference figures/diagrams in the code — misreading the diagram leads to incorrect second‑story envelopes Always prepare a section/angle diagram that follows the Code's Figure references and cite § 153.040 with illustration § 153.040
Landscaping buffer reductions Buffer width reductions are allowed only with written agreements for adjacent buffers — verbal promises or plans are insufficient If proposing reduced Type 1/2 buffers, include recorded agreements and reference § 153.535(B)(3) § 153.535
Parking requirement interpretation (tandem, guest) Mixed‑use and multi‑family parking ratios in § 153.164 cross‑reference § 153.220; whether tandem counts and secure separation rules can change required layout Early coordination with parking standards chapter and show separate secured residential parking per § 153.164(C)(1) § 153.164 § 153.220
Parcel‑specific zone edge conditions Where a project abuts an R‑1/R‑2 zone, stricter height/coverage/setbacks apply (mixed‑use, MF, C‑zones) Verify abutting zone boundaries from the City zoning map and apply the abutting‑zone rules (see multiple sections like § 153.164 and § 153.316) § 153.164 § 153.316

Plain‑English Summary

San Gabriel’s zoning code sets clear numeric limits for how big buildings can be (height and FAR), how much of the lot they can cover, and how far they must sit back from property lines; single‑family lots are tightly limited (e.g., 35% lot coverage and 0.35 FAR for two‑story houses, § 153.042/153.043), commercial zones allow taller and denser buildings (C‑3 FAR 0.7, height up to 70 ft), and mixed‑use rules (in the C‑1/C‑3 mixed‑use subchapter) add special rules for where residential can go, minimum site area per unit, parking, and stepped‑back residential floors (§ 153.155; § 153.164) § 153.155 § 153.164 .

Source References

  • San Gabriel Municipal Code: Zone list and map — § 153.015 (zones established) § 153.015 .
  • R‑1 residential development standards: § 153.040 (angled plane/front/side/rear height planes) § 153.040 ; § 153.041 (distances between buildings) § 153.041 ; § 153.042 (lot coverage) § 153.042 ; § 153.043 (FAR second story 0.35) § 153.043 .
  • R‑1A / accessory building rules: § 153.062, § 153.063 § 153.062 § 153.063 .
  • R‑2 / R‑3 rules: § 153.079 (R‑2 purpose) § 153.079 ; § 153.100–103 (R‑3 uses, height, site area) § 153.100 § 153.101 § 153.102 .
  • C‑1 / C‑3 development standards table and FAR: § 153.155 (table of C‑1/C‑3/M‑1 standards) § 153.155 .
  • Mixed‑use provisions for C‑1/C‑3: § 153.164 (mixed‑use purpose, permitted uses, development standards) and the mixed‑use subchapter development standards (§ 153.164; and mixed‑use itemized development rules in § 153.164(C)) § 153.164 .
  • Parking and surface parking development standards: § 153.174 (surface parking setbacks, walls, landscaping) and § 153.220 (parking spaces required) § 153.174 § 153.220 .
  • ADU provisions and standards (local ADU rules and cross references to state law): ADU divisions including size, setbacks and ministerial timelines; see the ADU provisions referenced in the code (e.g., § 153.047 and related paragraphs) § 153.047 ; additional ADU details (unit sizes, replacement rules) § 153.047 / ADU divisions .
  • Landscaping & buffer yard standards: § 153.535 (required buffer yards, Type 1/2 requirements, planter rules) § 153.535 .
  • Medical Facilities special standards: § 153.315–318 (building area, setbacks, parking, open space) § 153.315–318 .
  • Objective design standards that may apply to multi‑family or mixed‑use projects: § 153.134 § 153.134 .
  • Cross‑reference to stormwater/low‑impact development: § 53.19 and Chapter 12.84 adoption by reference (LID standards) § 53.19 .
  • State and technical code context (for reference only): California Building Code (Title 24) materials are referenced in the Municipal Code; local code refers to building and fire code compliance (see Chapter 150 cross‑references) § 153.133 and Chapter 150 references .
  • (Supporting guidance: 2025 California ADU handbook excerpts included in the uploaded materials for state/ADU interaction context) .

Sources

Retrieved passages

  • San Gabriel Zoning Code (§ 9-3.856) High relevance
  • San Gabriel Zoning Code (§ 153.999) High relevance
  • San Gabriel Zoning Code (§ 153.999) High relevance
  • San Gabriel Zoning Code (§ 153.220) High relevance
  • San Gabriel Zoning Code (§ 9-3.506) High relevance
  • San Gabriel Zoning Code (§ 153.100) High relevance
  • CBC § 65852.22 (§ 65852.22.) High relevance
  • San Gabriel Zoning Code (§ 153.064) High relevance
  • CFC § 153.155 (§ 153.155) High relevance
  • San Gabriel Zoning Code (§ 153.151) Medium relevance
  • San Gabriel Zoning Code (§ 153.226) Medium relevance
  • San Gabriel Zoning Code (section of) Medium relevance
  • San Gabriel Zoning Code (§ 9-3.852) Medium relevance

Cited sections

Frequently asked questions

What can I build on an R‑1 lot in San Gabriel?

Single‑family residential uses and accessory structures are the baseline. New single‑family dwellings must meet the R‑1 development standards: 35% lot coverage, second‑story 0.35 FAR limit when exceeding one story, and the angled‑plane height/second‑story envelope requirements (§ 153.042; § 153.043; § 153.040) § 153.042 § 153.043 § 153.040 .

What are San Gabriel setback requirements for a typical single‑family addition?

Setbacks and vertical envelopes for R‑1 are controlled by the angled‑plane diagrams: a 45° plane from the front and sides (measured as the Code diagram prescribes) and 35° from the rear; accessory buildings follow the accessory‑building separation rules (6 ft min.) (§ 153.040; § 153.041) § 153.040 § 153.041 .

How much of my lot can I cover in San Gabriel?

For single‑family residential lots the Code caps building/impervious coverage at 35% of the net lot area (§ 153.042). For mixed‑use sites, lot coverage limits are higher (e.g., 55% when abutting R‑1/R‑2, 60% elsewhere per the mixed‑use rules) (§ 153.042; § 153.164) § 153.042 § 153.164 .

What is the maximum height in the R‑3 zone?

Maximum height in the R‑3 Multiple‑Family Residence Zone is three stories or 35 feet (§ 153.101) § 153.101 .

Do I need to provide parking for a mixed‑use project and how much?

Yes. Mixed‑use developments must meet off‑street parking rules: residential spaces are generally 1 space per bedroom, guest parking 1 per 3 units, and mixed‑use parking references the off‑street parking chapter (§ 153.164(C)(1) and § 153.220) § 153.164 § 153.220 . Verify whether tandem is allowed for assigned spaces only and whether covered/secured parking is required for residential spaces (§ 153.164(C)(1)) § 153.164 .

Where are ADU size and setback rules in San Gabriel?

The municipal ADU rules appear in the ADU divisions (see local ADU provisions and cross references to state law). Local provisions permit detached ADUs up to 800 sq ft (with some local size ceilings of 850/1,000 sq ft for certain types) and allow 4‑ft side/rear setbacks for detached ADUs under state law constraints; the Code contains the local ADU subsections and ministerial timelines (see the ADU text and § 153.047 and associated ADU paragraphs) § 153.047 § 153.047 .

Do mixed‑use buildings have different setback rules than pure commercial buildings?

Yes — the mixed‑use subchapter allows 0 ft commercial frontages but requires residential floors to step back minimum 5 ft beyond commercial floors; side and rear setbacks for mixed‑use are stricter when abutting residential zones (side 10 ft, rear 15 ft) (§ 153.164(C)(6)–(8)) § 153.164 .

Where can I find landscaping and buffer requirements for a project next to housing?

Required landscape buffers, buffer yard types (Type 1/Type 2), trees/shrub counts per 100 ft, and building perimeter planter requirements are in § 153.535 (landscaping and screening) § 153.535 .

Are there special rules for parking lot walls where parking abuts residential zones?

Yes — when a surface parking lot abuts a residential zone a solid masonry wall must be provided to the residential zone’s maximum permitted height, and required setback areas must be landscaped and irrigated. See § 153.174(B–D) for the surface parking development standards § 153.174 .

If my lot abuts an R‑1 zone, does that change allowable density for mixed‑use?

Yes — mixed‑use projects abutting R‑1 or R‑2 require larger minimum site area per multi‑family unit (3,960 sq ft per unit) versus 1,452 sq ft where abutting other zones (§ 153.164(C)(2)) § 153.164 . ---

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