Local zoning · Isleton

Isleton — Zoning

Zoning under the Isleton local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

Isleton’s zoning ordinance is codified as Title 17 — Zoning and establishes a zone plan, base and combining districts, and development controls that implement the General Plan (§ 101, § 104, § 201) . The ordinance requires that all development comply with district use lists and local development standards (setbacks, lot area, parking) and that some projects undergo site plan and architectural review under the city’s design review rules (§ 104, § 301, § 705) . Before you design or submit, confirm the property’s map designation on Map No. 301 and read the district-specific rules listed below (§ 301–302) .

Key internal resources you will need while using this page: read the city’s rules on development standards, parking, design review, overlay districts, ADUs, nonconforming uses, variances and exceptions, and note that the state California Building Standards Code (Title 24) is a separate technical regime that complements but does not replace zoning requirements.

District-by-district breakdown

The ordinance lists base districts and combining (overlay) districts and ties map boundaries to “Map No. 301” (the zone plan) (§ 201, § 301) . Each subsection below gives the local purpose, typical permitted uses, key dimensional requirements found in the ordinance, and where the district is intended to apply.

RCO — Resource, Conservation and Open Space District

  • Purpose: preserve open space, parklands, lands with scenic/wildlife value and lands under Williamson Act contracts (§ 401) .
  • Typical permitted uses: fruit and nut trees, vegetable and horticultural uses, flood control channels, water pumping stations, irrigation canals, incidental accessory structures (§ 402) .
  • Conditional uses: recreation areas, schools, marinas and related buildings require conditional/commission approval (§ 403) .
  • Where applied: lands designated open space or agriculture on the General Plan and on Map No. 301 (§ 401, § 301) .

UR — Urban Reserve District

  • Purpose & application: reserved for future urban expansion; used where pre‑zoning for potential annexation or planned urbanization is appropriate (§ 201, § 304) .
  • Key: specific permitted uses and development standards vary and are typically limited until an area is brought forward with a development plan or annexation policies (see § 304) .
  • Verify: current map designation is required; pre‑zoning does not automatically permit full urban development until infrastructure and plan approvals occur (§ 304) .

R — One‑Family Residential Districts (Examples: R-1-7, R-1-5, R-1-6)

  • Purpose: protect single‑family neighborhood character and control density through minimum lot area designations (§ 201, § 602) .
  • Typical permitted uses: one‑family dwellings, small family day care, non‑commercial gardening, accessory structures; limited community uses by conditional permit (§ 602) .
  • Key dimensional standards:
    • R-1-7: 7,000 sq ft minimum site area (listed in the base districts table) (§ 201) .
    • R-1-5: 5,000 sq ft minimum site area (§ 201) .
    • R-1-6: purpose and permitted uses are described in the ordinance; see § 602 for the permitted uses and § 603 for conditional uses that apply in R-1-6 areas (§ 602–603) .
  • ADUs: a second housing unit (ADU/second unit) is explicitly referenced as allowed in residential districts per local rules and cross‑references section § 1206 for second unit rules; consult the ADU page for state/local interactions (§ 603.M, § 1206) .

RM — Multi‑Family Residential Districts (RM-2.0, RM-3.0, RM-4.0, RM‑MH‑5.4)

  • Purpose: allow medium to higher density multi‑family housing, with subtypes and mobile‑home park densities spelled out (§ 701–703) .
  • Typical permitted uses: one‑family dwellings (in some RM variants), multi‑family dwellings, accessory structures, noncommercial gardening, certain small licensed care homes, and personal cannabis cultivation rules by article 23 where allowed (§ 702, § 2302) .
  • Key dimensional standards:
    • Minimum lot area per dwelling unit: RM-2.0 = 2,000 sq ft, RM-3.0 = 3,000 sq ft, RM-4.0 = 4,000 sq ft (see § 704.B–C) .
    • Minimum site area: e.g., RM-3.0 3,000 sq ft site, RM-MH-5.4 specifies 5.4k sq ft per mobile home (8 units per net acre) (§ 704.B; § 201 table) .
    • Multi‑family projects of 10+ units are reviewed under PUD rules; projects of 20+ units must provide open space and visitor parking standards (visitor parking 1 space per 4 units; additional landscaping/open space rules) (§ 1514.A, § 1514.D, § 1514.H) .
  • Site plan and design review: most RM uses require site plan and architectural approval under articles 15 and 17 before building permits are issued (§ 705) .

CC / CCRD — Central Commercial / Commercial District

  • Purpose: core commercial activity — retail, offices, services, entertainment — arranged for community convenience; CCRD intended for central commercial/residential mixed location (§ 801–802) .
  • Typical permitted uses: parking lots, professional & commercial offices, retail stores, personal and business services (full list in § 802) (§ 802) .
  • Development approach: central commercial areas east of H Street are intended to be developed as unified commercial centers; CCRD/CC areas may carry special conditions and are subject to general provisions and design review (§ 802.A–B, § 806) .

PDI — Planned Industrial District

  • Purpose: locate and protect industrial uses separated from incompatible uses and provide industrial development standards, parking and truck loading requirements (§ 901) .
  • Typical permitted uses: assembly, machine and paint shops, contractor yards, fruit/vegetable processing, manufacturing of instruments and electronics, warehousing, gasoline service stations, public utility structures (§ 902) .
  • Standards: building heights allowed up to 75 feet in some industrial areas (with exceptions for tanks/towers per article 4); site plan and architectural review required before erecting uses (§ 18?—see Sec. 18**??** for heights and § 906 for site plan). The ordinance text explicitly provides a 75 ft ceiling for some industrial heights (§ 18? in the industrial context) — verify height specifics with the city (§ 906, § 18? not fully reproduced in retrieved snippets) .

Note on combining/overlay districts:

  • PUD (Planned Unit Development) and MXU (Mixed Use) are combining districts that add additional procedures and flexibility. A PUD requires following article 16 PUD procedures; MXU is intended for redevelopment areas and allows mixed‑use arrangements under city discretion (§ 1001–1002) .

Quick standards & permitted-uses table

District Typical permitted uses (decision‑relevant) Key numeric standards (examples) Code Reference
R-1-7 One‑family dwellings, accessory uses 7,000 sq ft minimum site § 201
R-1-5 One‑family dwellings, accessory uses 5,000 sq ft minimum site § 201
R-1-6 One‑family dwellings, day care, small care homes Permitted/conditional uses listed in § 602–603 § 602–603
RM-2.0 / RM-3.0 / RM-4.0 Multi‑family dwellings, accessory uses Min site area / unit: RM‑2 = 2,000, RM‑3 = 3,000, RM‑4 = 4,000 sq ft/unit § 704.B–C; § 702
CC / CCRD Retail, offices, services, parking Central commercial standards; design review may apply § 801–802
PDI Manufacturing, processing, warehousing, contractor yards Industrial building/height standards, truck loading; site plan req’d § 901–906
RCO Agriculture, open space, flood control Uses limited to conservation/open‑space types § 401–403
PUD / MXU (combining) Mixed/innovative developments subject to PUD or redevelopment controls Subject to article 16 (PUD) or MXU procedures (§ 1001–1002) § 1001–1002

(For multi‑family open space, landscaping and visitor parking requirements see § 1514 — multi‑family projects of 10+ units must follow PUD; projects of 20+ units have explicit open space and visitor parking thresholds) .

Checklist

  • Confirm the parcel’s zoning designation on Map No. 301 (zone plan) and note any combining districts (§ 301–302) .
  • Read the district‑specific permitted and conditional uses for that district (e.g., § 602 for R‑1‑6, § 702 for RM, § 902 for PDI) .
  • Check minimum lot area / lot‑per‑unit and minimum site area requirements (see § 201, § 704) .
  • Verify setback, height, lot coverage and open space rules in the applicable article(s) (see district property development sections and development standards) (§ 604/704/other district sections) .
  • Determine required off‑street parking and loading per article 11 and visitor parking rules for multi‑family (§ 1514, article 11) — consult parking (§ 1514.H) .
  • Determine whether site plan and architectural design review is required (articles 15 & 17; e.g., RM § 705, I district § 906) (§ 705, § 906) .
  • If the use is conditional, follow Article 14 procedures for conditional use permits and any environmental review (see § 603, § 1909) .
  • If the project is a PUD or in an MXU combining district, prepare the PUD submittal per § 1001–1002 and article 16 requirements (§ 1001–1002) .
  • For ADUs, consult local ADU rules referenced in the code (see § 603.M and § 1206) and applicable state ADU law — check the city ADU page ADUs (§ 603.M, § 1206) .
  • Verify consistency with the General Plan before filing; the city will refuse applications inconsistent with the General Plan (§ 205) .

Risks & Ambiguities

Issue Why it matters What to verify
District boundary uncertainty Map No. 301 boundaries control which rules apply; small boundary shifts can change allowed uses Confirm official zone plan map for the parcel at City Clerk or planning department; see § 301–302
Partial/incomplete dimensional data in retrieved excerpts Setbacks, maximum lot coverage, and exact heights for many base districts are not fully reproduced here Verify the full property development standards for the district in the complete code (see district property development sections such as § 604, § 704) — Verify with the city
Nonconforming uses and expansion limits The ordinance references nonconforming uses (modest expansion rules) but full program not located in snippets Check the city’s nonconforming uses article or nonconforming uses; not fully found in retrieved materials — Verify with the jurisdiction (§ 603.L notes)
ADU local vs. state rules State ADU law imposes limits that preempt some local rules; the local code references ADUs but cross‑checking with state law is essential Use local ADU section § 1206 and compare to California ADU rules; see ADUs and state guidance — Verify with city planner (§ 603.M, § 1206)
Parking specifics The code points to article 11 and provides some multi‑family visitor ratios, but a full parking table was not present in the snippets Look up Article 11 in the full code or the city’s parking page; verify required stalls, ADA rules, and loading (§ 1514.H; article 11)
Zoning map graphic (Map No. 301) not included You need the actual map sheet(s) to locate district lines and overlays Request Map No. 301 from the City Clerk/planning staff; code states Map No. 301 is part of the ordinance (§ 301)

Plain-English Summary

Isleton’s zoning code (Title 17) sets a map (Map No. 301) and a set of districts — residential (single‑ and multi‑family), commercial, industrial, and resource/open‑space — that list allowed uses and minimum development standards (lot area, density, special PUD/MXU procedures) and require design review or conditional permits for many projects; always check the map and the district sections that apply to your parcel before designing or filing (§ 201, § 301–304, § 705) .

Source References

  • Isleton Zoning Code — Title 17 Zoning: adoption, purposes and components: § 101, § 102, § 104 .
  • Zone plan / Map No. 301 (zone plan adoption, division and amendments): § 301–304 .
  • Establishment and list of base & combining districts (RCO, UR, R, RM, C, I; PUD, MXU): § 201 .
  • RCO district (purpose, permitted and conditional uses): § 401–403 .
  • R‑1 family districts and R‑1‑6 permitted/conditional uses: § 602–603 .
  • RM multi‑family uses and property development standards (lot area per unit): § 702–704 and multi‑family policies § 1514 .
  • Central commercial/CCRD (purpose and permitted uses): § 801–802 .
  • Planned Industrial District (purpose, permitted and conditional uses): § 901–903; § 906 (site plan review) .
  • Combining districts: PUD and MXU rules and procedures: § 1001–1002 .
  • ADUs / second unit references in conditional use lists and cross references: § 603.M and local second unit section § 1206 (local ADU specifics) .
  • Multi‑family open space, recreation and visitor parking rules: § 1514.A–J (multi‑family policies) .
  • Source note: the ordinance excerpts were retrieved from the Isleton Zoning Code file (Title 17) as supplied (source: library.municode.com as referenced in the code file) .

Information Gaps

  • Full, parcel‑level zone plan graphics (Map No. 301) were not included in the retrieved text; obtain the map from the City Clerk or planning department (Map No. 301 referenced in § 301) .
  • Complete numeric development standards (setbacks, lot coverage, FAR, district‑specific maximum heights for all districts) were not reproduced in full in the retrieved excerpts — verify the full district development standards in the complete code (various property development sections and article 6/7 references). Not all setback/coverage tables were found in the snippets.
  • The full text of Article 11 (parking schedule and detailed loading/ADA requirements) and Article 12 (signage) were not included in the excerpts; consult those articles directly.
  • A comprehensive standalone article for nonconforming uses was not located in the provided snippets; the code references nonconforming rules in places but the full nonconforming provisions are "Not found in retrieved materials" — verify with the jurisdiction.
  • Exact industrial height allowances and exceptions were referenced but the specific section number for the "75 ft" statement and industrial exceptions needs confirmation in the complete code (verify with planning staff) .

Sources

Retrieved passages

  • Isleton Zoning Code (§ 1) High relevance
  • Isleton Zoning Code (section 604.F.3) High relevance
  • Isleton Zoning Code (§ 1) High relevance
  • Isleton Zoning Code (§ 1) High relevance
  • Isleton Zoning Code (§ 1) High relevance
  • Isleton Zoning Code (section 1910) High relevance
  • Isleton Zoning Code (article 15) High relevance
  • Isleton Zoning Code (article may) High relevance

Cited sections

Frequently asked questions

What can I build on an R-1 lot in Isleton?

On R‑1 lots the ordinance primarily allows one‑family dwellings and accessory structures; small family day care homes and certain licensed care homes are permitted. Specific permitted and conditional uses for the R‑1 variant applicable to your parcel are listed in § 602–603; always confirm the exact R‑1 subtype (e.g., R-1-5, R-1-7, R-1-6) on Map No. 301 because minimum lot area and some uses differ by subtype (§ 201, § 602–603) .

What are the Isleton setback and lot‑area requirements?

Minimum lot area rules are called out in the base district table (for example R‑1‑7 = 7,000 sq ft, R‑1‑5 = 5,000 sq ft, and RM districts specify site area per dwelling unit RM‑2 = 2,000, RM‑3 = 3,000, RM‑4 = 4,000 sq ft/unit) — see § 201 and § 704.B–C. Precise front/side/rear setback dimensions and lot coverage metrics are in each district’s property development standards and other development sections; verify those specific numeric setback rules in the full code for your district (§ 201; § 704) .

Do I need design review in Isleton?

Many non‑single‑family developments require site plan and architectural design review under articles 15 and 17. For example, most RM uses (except single‑family and accessory structures) cannot be established until site plans and architectural plans are approved (§ 705). Industrial (I) and many commercial projects also require site plan approval (§ 906). Check article 15 and § 705 / § 906 to see if your project needs review and consult the city’s design review guidance (§ 705, § 906) .

Can I build an ADU on my Isleton lot?

Yes — the zoning ordinance explicitly references second housing units and cross‑references the local ADU rules (see § 603.M and local second unit section § 1206). However, ADU approvals must also satisfy local ADU standards and applicable state ADU law; check the city’s ADU guidance ADUs and § 1206 for local specifics and confirmation of applicable setbacks/height/parking exemptions (§ 603.M, § 1206) .

How do I find the official zone for my parcel?

The ordinance makes the zone plan (Map No. 301) part of the code and requires you to use it to determine district boundaries; consult Map No. 301 at city offices or through the City Clerk/planning department and read § 301–302 for mapping rules. Where doubt exists over a boundary line the code provides rules on interpreting lines (centerlines of streets, etc.) — see § 301–302 (§ 301–302) .

What if my proposed use is not listed as “permitted” in the district?

If a use is not listed as permitted it may be allowed only as a conditional use (Article 14), by a zone change per the amendment procedures in article 19, or through a special zoning exception where the commission/council follow alternate procedures (§ 603, § 1901–1912, § 1910). Always check the district’s conditional use list and follow the Article 14 and Article 19 procedures if seeking approval (§ 603; § 1901–1912; § 1910) .

Where are Isleton’s parking requirements shown?

Off‑street parking and loading standards are located in article 11; multi‑family development rules in § 1514 add supplemental visitor parking requirements (e.g., visitor parking at a ratio of 1 space per 4 units, with on‑street substitution rules) (§ 1514.H and article 11). Consult the city’s parking guidance and article 11 for the full schedule and design requirements (§ 1514.H) .

How do combining (overlay) districts change base zoning?

Combining districts such as PUD and MXU are applied on top of base zones to impose additional development procedures or flexibility; PUD projects must follow article 16 and MXU is for redevelopment project areas (see § 1001–1002) — read the combining district rules to see how they modify base requirements (§ 1001–1002) .

Are cannabis activities allowed in residential zones?

The local code permits indoor personal cannabis cultivation in R and RM residential districts subject to conditions (no exterior visibility, grow light wattage limits, ventilation/filtration, residency of grower) and explicitly prohibits outdoor cultivation in all zones (§ 2302–2303). Commercial cannabis activities are prohibited in residential zones (§ 2302–2303) .

If my lot is substandard (smaller than minimum), can I still build?

The code allows existing legal substandard lots to continue to be used as single legal substandard lots and provides rules where groups of substandard lots under common ownership may be treated as a single site; see the legal substandard lot provisions and § 107–108, § 17 references in the code. Verify whether your lot meets the legal substandard definition and any covenant/recording requirements before proceeding (§ 107; § 17? in snippets) — verify with the planning department (full text in the code) . ---

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