Ross — Zoning

Last reviewed: July 2, 2026

Overview

Ross implements its local zoning through Title 18 — Zoning. The code establishes the town’s map and a set of base districts (R-1, C‑L, C‑D, C‑C, P‑F, O‑S, F) plus combining districts (:B, :CD, :O, :H) and objective development rules; these are applied via the incorporated Zoning Map and the general rules in Chapter 18.40. See the district list in § 18.08.010 and the map incorporation rule in § 18.08.030 for the legal basis.

The rest of this page summarizes what Ross’s ordinance actually says about each zoning district and the most decision‑relevant standards (setbacks, heights, coverage, parking and ADU/two‑unit rules). Where a numerical requirement exists in the code I cite the controlling § and the source file. When the material is not present in the retrieved files I note that explicitly.

District-by-district breakdown

Note: each district name below is bolded and the controlling code citation is provided; internal links are added on first natural mentions to related implementation topics.

R‑1 — Single Family Residence district

Purpose: Preserve single‑family character and the town’s low‑density residential neighborhoods. § 18.16.020.

Typical permitted uses: single‑family residences, accessory uses (private garages, terraces, tool sheds, pools, home occupations), transitional/supportive housing; accessory dwelling units (ADUs/JADUs) are addressed separately under Chapter § 18.42. § 18.16.030 and § 18.42.010.

Key dimensional standards (confirmed in the ordinance):

• Front setback: 25 ft (standard R‑1) — § 18.16.050.
• Rear setback: 40 ft (standard R‑1) — § 18.16.050.
• Side setbacks: 15 ft (each side) — § 18.16.050.
• Height: two stories/attic, up to 30 ft — § 18.16.060.
• Max building coverage: 20% of lot area (standard R‑1) — § 18.16.070.

Where R‑1 is combined with the :B (special building site) combining district, minimum lot area/width, side yards and coverage/FAR are governed by the :B tables (see § 18.32.030–070), including the R‑1:B‑10 / B‑15 etc. variants. Examples: R‑1:B‑10 lot width 85 ft, side yard 15 ft; building coverage and FAR for many :B variants are 20% → 10% scale as listed in § 18.32.050–070.

(For how minimum lot/coverage numbers change by :B suffixes see the :B chapter; those numeric tables are the operative rules — § 18.32.030–070.)

C‑L — Local Service Commercial district

Purpose: Concentrated local commercial uses for resident convenience. § 18.20.020.

Typical permitted uses: mixed multifamily housing (with restrictions), retail (food, clothing, grocery, small professional offices) and local services; specified conditional uses require a use permit. § 18.20.025–030.

Key dimensional standards:

• Height: max two stories/attic, 30 ft — § 18.20.025(2).
• Max building coverage: 100% for mixed multifamily/commercial as allowed — § 18.20.025(3).
• FAR: 130% in mixed configurations — § 18.20.025(4).
• Parking: minimum 1 auto parking space per dwelling unit plus any commercial parking as required; see § 18.20.025(1) and the town’s parking rules.

Design review of outdoor advertising and other elements in C‑L is required under the Town’s design procedures; see § 18.41.

C‑D — Civic district

Purpose: Public/quasi‑public uses (town hall, library, schools, museums, fire/police) and related civic activities. § 18.24.020–030.

Permitted uses: Town public uses by right (town hall, library, museum, school, parks), multifamily housing and transitional housing are listed among permitted public‑purpose uses; single‑family residential can be allowed with a use permit. § 18.24.030–035.

Key standards for multifamily/transitional housing in C‑D:

• Parking: minimum 1 auto parking space per dwelling unit — § 18.24.040(b)(1).
• Height: max two stories/attic; 30 ft — § 18.24.040(b)(2).
• Max building coverage and FAR: 50% each for multifamily/transitional housing — § 18.24.040(b)(3–4).

C‑C — Community Cultural district

Purpose and standards: Intended for cultural centers, museums and associated activities; minimum lot, coverage, yard and parking standards are specified in Chapter 18.28 (e.g., minimum lot area 1 acre, lot width 150 ft, coverage 25%, front yard 25 ft, parking formula). § 18.28.040–090.

P‑F — Public Facilities district

Purpose: Sites used for public purposes and utilities (schools, parks, fire stations, public utility facilities for local service). § 18.29.020–030.

Permitted uses: public schools, parks, recreation, hospitals, libraries, fire stations and similar uses by right; some public utility yards are conditional uses. § 18.29.030.

O‑S — Open Space district

Purpose: Preserve natural terrain, open space buffers, recreational and conservation areas. § 18.30.020–030.

Permitted uses: conservation, trails, parks, public riding stables/tennis/swimming, and watershed operations; caretaker living quarters by use permit. § 18.30.030.

F — Floodway district

Purpose: Applied to lands in stream or drainage channels subject to periodic inundation; the design flood is defined per zone mapping. § 18.31.020–030.

Permitted uses: recreational open land and flood control facilities by right; other infrastructure may be allowed with use permits. § 18.31.030.

Combining districts: :B, :CD, :O, :H

• :B (special building site) modifies R‑1 standards to reflect larger lots/unique lot patterns; numeric lot‑area tables, lot width, side yard, coverage and FAR are in § 18.32.030–070 (e.g., R‑1:B‑10 lot width 85 ft, side yards 15 ft, coverage/FAR often 20%) — use these tables to read the exact requirements for an individual parcel.
• :CD (special civic) imposes town council plan review requirements when combined — § 18.36.020 (plans submitted to town council).
• :O and :H are special open and special hazard combining districts; their application is enumerated in § 18.08.020 (combining districts) and in the chapters that implement them (search relevant chapters for details).

Key cross‑cutting rules & special topics

• Zoning map: the ordinance incorporates the “Zoning Map of the Town of Ross” into Title 18; the map controls district boundaries and the rules in § 18.08.030 explain boundary interpretation and conflict rules (when a lot is split, use the scale on the map; when a single ownership crosses boundaries the more restrictive classification applies). § 18.08.030.

• General regulations: Chapter § 18.40 contains the minimum‑standard rule, relationship to other regulations, district boundary rules, fences, yards, height exceptions and other general provisions that apply across districts. § 18.40.030–110.

• Design review: Many projects require design review by the Town Council (or administrative review for minor items); the review authority, criteria and notice rules are in Chapter 18.41. See design review criteria and approval findings in § 18.41.050–100. For practical guidance consult the Town’s design review page.

• Parking: Minimum parking rules are district‑specific (examples: C‑L and C‑D parking minima for residential uses are in § 18.20.025(1) and § 18.24.040(b)(1); :B districts give per‑lot parking minima in § 18.32.040). The Town also contains ADU/two‑unit parking exceptions (see § 18.42.055 and § 18.43.040). Consult the town parking page for applied checklists.

• ADUs and Two‑Unit Housing: Ross adopted an ADU chapter intended to be ministerial and consistent with state law; see § 18.42.010–090 for purpose, definitions, development standards and guaranteed allowances (size, height, parking exceptions, rent‑restricted ADUs, and administrative procedures). § 18.42.055 contains ADU size/height/parking rules; § 18.43 addresses objective standards for Two‑Unit Housing Developments. See the town ADUs page and the state California ADU law for the legal context.

• Variances and Exceptions: Where strict application would impose practical hardship, the Town Council may grant variances per § 18.48.010–030; minor exceptions for limited relief (e.g., fences, small accessory structures, attic/basement improvements) are handled under Chapter 18.45. See variances and exceptions.

• Nonconforming structures/uses: The code treats nonconformities under Chapter 18.52 with rules on continuation, repair, demolition and conditions for change; see § 18.52.050 for suspension/limitations. For implementation see nonconforming uses.

• Interaction with building code: The ordinance repeatedly cross‑references compliance with the California Building Standards (Title 24). For building‑code compliance the Town requires the most recent adopted California codes — see California Building Standards Code and specific code notes in several district standards (e.g., Two‑Unit Housing § 18.43.040(A)(11)).

Quick reference table (decision‑relevant items)

Checklist — what an applicant must satisfy (at minimum)

• Confirm zoning district on the Town’s Zoning Map and read the district chapter for that zone (§ 18.08.030).
• Confirm permitted/conditional uses for that district (e.g., § 18.16.030 for R‑1; § 18.20.025 for C‑L).
• Verify dimensional standards: setbacks (§ 18.16.050), height (§ 18.16.060), coverage/FAR (§ 18.16.070 / § 18.32.060–070 for :B).
• Calculate required off‑street parking and determine if any exemptions apply (ADU/TU exceptions in § 18.42.055 / § 18.43.040). See the Town’s parking rules.
• Determine whether design review is required (Chapter 18.41) and schedule review/notice requirements (§ 18.41.050–080). See the Town’s design review page.
• If proposing an ADU/JADU, follow the ministerial ADU standards and guaranteed allowances in § 18.42 (size, height, parking exemptions). See ADUs.
• If seeking relief from a standard, prepare a complete variance/exception application per § 18.48 or Chapter 18.45 and gather findings/evidence.
• Confirm any overlay or combining district (for example :B or :CD) that modifies numeric standards — these are applied in addition to the base district (§ 18.08.020 and the combining district chapters). See overlay districts.

Risks & Ambiguities

Plain‑English Summary

Ross’s Title 18 lays out a small family of districts (mostly R‑1 residential plus small commercial and public/cultural zones), numeric setbacks/heights/coverage rules (many R‑1 standards and more granular :B tables), and clear ADU/two‑unit rules designed to follow state ADU law; check the specific district chapter and combining‑district tables for the exact numbers that apply to your parcel (verify district on the Town Zoning Map). § 18.08.010, § 18.16.050–070, § 18.32.030–070, § 18.42.055.

Source References

• Title 18 — Zoning, Town of Ross (table of chapters and adoption): § 18.04, § 18.08.010–030.
• R‑1 Single Family Residence district: § 18.16.010–100 (permitted uses, setbacks, height, coverage) — see § 18.16.030 and § 18.16.050–070.
• C‑L Local Service Commercial: § 18.20.025 (permitted uses, parking, height, FAR).
• C‑D Civic district: § 18.24.030–040 (permitted civic uses; multifamily limits).
• C‑C Community Cultural district: Chapter 18.28 (lot area, yards, coverage).
• P‑F, O‑S, F districts: Chapters 18.29, 18.30, 18.31 respectively (permitted uses and application).
• Special Building Site (:B) tables: § 18.32.030–070 (lot area, parking, lot width, side yards, coverage, FAR).
• Design review: Chapter 18.41 (review authority, criteria) — § 18.41.050–100.
• ADUs and Two‑Unit Housing: Chapter 18.42 (ADUs) and Chapter 18.43 (Two‑Unit Housing) — ADU development standards § 18.42.055, Two‑Unit objective standards § 18.43.040.
• Variances and Exceptions: Chapter 18.48 (variances) and Chapter 18.45 (minor exceptions) — § 18.48.010–030, § 18.45.020–060.

(If you want, I can: 1) check the Town’s official zoning map graphic for a specific parcel, 2) extract the exact :B suffix that applies to a given parcel and tabulate the precise numeric standards that will govern it, or 3) prepare a step‑by‑step permit checklist tailored to a proposed scope — tell me which parcel or permit type and I’ll proceed.)

Retrieved passages

• Ross Zoning Code (§2) High relevance show source text
• CBC § 65852.21 (section 65852.21) High relevance show source text
• Ross Zoning Code (§5) High relevance show source text
• CBC § 10 (Chapter applicability) High relevance show source text
• Ross Zoning Code (§10) High relevance show source text
• Ross Zoning Code (Chapter 18.30) High relevance show source text
• Ross Zoning Code (section and) High relevance show source text
• Ross Zoning Code (Chapter 18.64) High relevance show source text
• Ross Zoning Code (Section 18.28.030) High relevance show source text
• Ross Zoning Code (§10) High relevance show source text
• Ross Zoning Code (§10) High relevance show source text
• Ross Zoning Code (§10) High relevance show source text
• Ross Zoning Code (Section 18.20.070) High relevance show source text
• CRC § 18.41.100 (Section 18.41.100) High relevance show source text

Cited sections

• Title 18 — Zoning, Town of Ross (table of chapters and adoption): **§ 18.04**, **§ 18.08.010–030**. (Title 18)
• R‑1 Single Family Residence district: **§ 18.16.010–100** (permitted uses, setbacks, height, coverage) — see **§ 18.16.030** and **§ 18.16.050–070**. (§ 18.16.010)
• C‑L Local Service Commercial: **§ 18.20.025** (permitted uses, parking, height, FAR). (§ 18.20.025)
• C‑D Civic district: **§ 18.24.030–040** (permitted civic uses; multifamily limits). (§ 18.24.030)
• C‑C Community Cultural district: **Chapter 18.28** (lot area, yards, coverage). (Chapter 18.28)
• P‑F, O‑S, F districts: **Chapters 18.29, 18.30, 18.31** respectively (permitted uses and application).
• Special Building Site (:B) tables: **§ 18.32.030–070** (lot area, parking, lot width, side yards, coverage, FAR). (§ 18.32.030)
• Design review: **Chapter 18.41** (review authority, criteria) — **§ 18.41.050–100**. (Chapter 18.41)
• ADUs and Two‑Unit Housing: **Chapter 18.42** (ADUs) and **Chapter 18.43** (Two‑Unit Housing) — ADU development standards **§ 18.42.055**, Two‑Unit objective standards **§ 18.43.040**. (Chapter 18.42)
• Variances and Exceptions: **Chapter 18.48** (variances) and **Chapter 18.45** (minor exceptions) — **§ 18.48.010–030**, **§ 18.45.020–060**. (Chapter 18.48)
• Ross_ZoningCode.md

• Official Ross code library