Atherton — Land Use

Last reviewed: July 3, 2026

Overview

This page summarizes what the Town of Atherton’s zoning ordinance (Title 17) actually says about permitted and conditional land uses, how to read the use tables, and the district- and overlay-specific rules that control whether a use is allowed. It is drawn from the Town’s zoning chapters (not building code or statewide statutes) and points to the exact local sections you must check for parcel-level decisions. See the Town’s rules on design review, development standards, overlay districts, ADUs, and parking for related procedural requirements linked below. (§ 17.30.030; § 17.30.040)

How Atherton organizes land‑use rules (quick points)

• Allowed uses are listed by zoning district in district-specific tables (P = permitted by right; CUP = allowed with a conditional use permit). Table references and district chapters are the primary control documents. § 17.30.030
• If a proposed use is not listed, the Planning Commission may treat it as a similar use and process it as a CUP only after making explicit findings. § 17.30.040
• Certain commercial‑residential uses (hotels, motels, B&Bs, boardinghouses) are expressly prohibited. § 17.30.050

(Read related pages for procedure and technical standards: Atherton Design Review, Atherton Development Standards, Atherton Overlay Districts, Atherton ADUs, Atherton Parking, and the California Building Standards Code.)

District-by-district breakdown (what to check first)

Note: below every district name is bolded and the local controlling sections are cited. For permitted/conditional uses see the district’s “Allowed Uses and Permit Requirements” table (e.g., Table 17.32.030‑1); for dimensional standards see the district’s “Development Standards” section.

R-1A — Residential District R-1A

• Purpose: Implements single‑family residential land‑use categories. § 17.32.010 identifies intent.
• Typical permitted uses: single‑family dwelling, employee housing (≤6), group homes for persons with disabilities, home occupations, second dwelling units/ADUs (subject to chapter 17.52), mobile/manufactured homes on permanent foundations, and in some instances multifamily only where a Multifamily Overlay (RM‑10) applies. See Table 17.32.030‑1. § 17.32.030.
• Typical conditional uses (CUP): churches and places of worship, public utilities/facilities (per table notes). § 17.32.030.
• Key dimensional standards: standard maximum height 30 ft for main buildings (sidewall/column limits lower), with specific rules allowing increases only via additional setbacks or by special structure permit; front/rear/side yard rules and accessory structure caps are set in § 17.32.040 and related tables (see chapter 17.38 for side-yard tables). § 17.32.040; Table references.
• Where it applies: consult the Town zoning map; interpretation rules for boundaries are in § 17.30.060. § 17.32.010; § 17.30.060.

R-1B — Residential District R-1B

• Purpose/character: Single‑family residential at roughly one dwelling per lot; minimum lot size and subdivision rules are described in the chapter. § 17.33.010–020.
• Typical permitted uses: single‑family dwelling, employee housing, group homes for persons with disabilities, home occupations, second dwelling units/ADUs (subject to § 17.33.040 and chapter 17.52). See Table 17.33.030‑1. § 17.33.030.
• Typical CUPs: churches/places of worship, public utilities/facilities. § 17.33.030.
• Key dimensional standards: maximum main building height 28 ft (vertical sidewalls/columns limited); minimum setbacks and special dormer/sidewall rules appear in § 17.33.040. § 17.33.040.

POS — Park and Open Space District (POS)

• Purpose/character: Preservation of open space, parks, watershed protection, outdoor recreation. § 17.34.010–020.
• Typical permitted uses: agriculture, ecologic study, employee housing (limited), group homes for persons with disabilities, park/recreation/open space, multifamily only where RM‑10 overlay applies, uses of historic/cultural value. See Table 17.34.030‑1. § 17.34.030.
• Typical CUPs: country clubs, public utilities/facilities, caretaker housing. § 17.34.030.
• Key dimensional standards: lower lot coverage (example: 20% gross lot area maximum), maximum height 34 ft, and front/rear yard 60 ft min for main buildings (see Table 17.34.040‑1 / § 17.34.040). § 17.34.040.

PFS — Public Facilities and Schools District (PFS)

• Purpose/character: Siting of town/civic/public facilities and schools; may allow residential only when accessory to a public/school use (e.g., dorms, teacher housing). § 17.36.010–020.
• Typical permitted uses: public library, public school, town hall, town corporation yard, public utilities, emergency shelters (with limits), multiple‑family residential on multifamily overlay lots. See Table 17.36.030‑1. § 17.36.030.
• Typical CUPs: private schools (if not on an adopted master plan), churches, country clubs, transportation terminals. § 17.36.030 (notes explain master plan/CUP detail).
• Key standards: development standards are in § 17.36.040 (see Table 17.36.040). § 17.36.040.

Overlay districts (how overlays change base rules)

• The code recognizes the Parker Avenue Overlay (P), Multifamily Overlay (RM‑10), and Multifamily Overlay (RM‑20/40); overlays allow additional uses or modified standards where applied. See § 17.30.080 and the overlay chapters (e.g., Chapter 17.35 for RM‑10; § 17.36.070 for RM‑20/40; Chapter 17.37 for the Parker Ave overlay). § 17.30.080; Chapter 17.35; § 17.36.070; Chapter 17.37.
• Example effects: multifamily uses and certain housing rights are permitted in RM overlays even where base R‑1A/R‑1B would not allow them; Parker Ave (P) allows greater floor area but modifies height/setback calculations. See the overlay chapters for objective design standards. Chapter 17.35; Chapter 17.37.

Quick reference table — common uses and local code references

(For full, district specific allowed‑use tables see each district chapter’s “Allowed Uses and Permit Requirements” tables.)

How Atherton treats “uses not listed” and similar‑use determinations

• If a use is not specifically listed, the Planning Commission may determine it is a similar use and treat it as a conditional use. The Commission must find consistency with the General Plan and the district purpose and that the proposed use’s activities/characteristics are equivalent to a listed use. § 17.30.040.

Checklist — what an applicant must show (parcel by parcel)

• Confirm base zoning district for the parcel and read the district’s Allowed Uses table. § 17.30.030; § 17.32.030; § 17.33.030; § 17.34.030; § 17.36.030.
• Verify whether an applicable overlay (e.g., RM‑10, RM‑20/40, Parker Ave (P)) changes allowed uses or standards. § 17.30.080; Chapter 17.35; Chapter 17.37.
• Confirm dimensional compliance (height, lot coverage, setbacks, accessory caps) in the district’s Development Standards chapter and side‑yard tables. § 17.32.040; § 17.33.040; § 17.34.040; § 17.38.010.
• If the use is a CUP or not clearly listed, prepare the CUP application and findings (including traffic/parking if required). See chapter 17.12 (Conditional Use Permit procedure — Not found in retrieved materials; verify with the jurisdiction) and note the special submittal requirements for private‑school master plans in § 17.36.030.
• If proposing an ADU, follow chapter 17.52 (objective ADU rules and timelines) and be aware of state ADU law integration. § 17.52.010–040.
• If design elements trigger design review or landscape screening, submit required plans per the Town’s design review and landscape chapters. See Atherton Design Review and Atherton Landscaping and Screening. § 17.50.010 et seq.
• Confirm off‑street parking obligations per Town rules. See Atherton Parking. (Specific parking table references: Not found in retrieved materials — verify with the jurisdiction.)

Risks & Ambiguities

Plain‑English summary

Atherton’s Title 17 lists allowed uses in district‑specific tables: single‑family homes and ADUs are permitted in the R‑districts, parks/open space and public facilities are allowed in POS/PFS districts, and multifamily is only allowed where a multifamily overlay applies; anything not listed must be treated as a “similar use” and will need a CUP. Always check the district’s Allowed Uses table and the district development standards first, then confirm overlays and consult the Town Planner for boundary or interpretation issues. (§ 17.30.030; § 17.30.040; chapter 17.32–37; chapter 17.35)

Information Gaps

• The uploaded materials do not include the Town’s official zoning map showing which parcels are in R‑1A, R‑1B, POS, PFS, or overlays — verify with the Town. § 17.30.060 notes boundary interpretation but the map itself is not in retrieved files.
• The files reference Conditional Use Permit procedure (chapter 17.12) but the detailed steps/forms for CUP submittal and fees were not present in the retrieved snippets. (Verify with the Planning Department.) Not found in retrieved materials.
• The municipal parking standards table and specific parking ratios were not found in the retrieved snippets. See the Town’s parking chapter/page. Not found in retrieved materials.

Source References

• Allowed uses generally: § 17.30.030; Similar‑use procedure: § 17.30.040; Commercial‑residential prohibition: § 17.30.050.
• Chapter 17.32 (R‑1A) — Allowed Uses § 17.32.030; Development Standards § 17.32.040.
• Chapter 17.33 (R‑1B) — Allowed Uses § 17.33.030; Development Standards § 17.33.040.
• Chapter 17.34 (POS) — Allowed Uses § 17.34.030; Development Standards § 17.34.040 (Table 17.34.040‑1).
• Chapter 17.36 (PFS) — Allowed Uses § 17.36.030; Development Standards § 17.36.040; Emergency shelter standards § 17.36.060.
• Overlay districts and definitions: § 17.30.080; Chapter 17.35 (RM‑10); § 17.36.070 (RM‑20/40); Chapter 17.37 (Parker Ave Overlay).
• ADUs: Chapter 17.52 (purpose and zones allowed; definitions; objective standards).
• Landscape screening: Chapter 17.50.

Retrieved passages

• Atherton Zoning Code (chapter and) High relevance show source text
• Atherton Zoning Code (Title 17) High relevance show source text
• Atherton Zoning Code (chapter and) High relevance show source text
• Atherton Zoning Code (Title 17) High relevance show source text
• Atherton Zoning Code (Title 17) High relevance show source text
• Atherton Zoning Code (Title 17) High relevance show source text
• Atherton Zoning Code (chapter is) High relevance show source text
• Atherton Zoning Code (section 17.32.040) High relevance show source text

Cited sections

• Allowed uses generally: **§ 17.30.030**; Similar‑use procedure: **§ 17.30.040**; Commercial‑residential prohibition: **§ 17.30.050**. (§ 17.30.030)
• **Chapter 17.32 (R‑1A)** — Allowed Uses **§ 17.32.030**; Development Standards **§ 17.32.040**. (Chapter 17.32)
• **Chapter 17.33 (R‑1B)** — Allowed Uses **§ 17.33.030**; Development Standards **§ 17.33.040**. (Chapter 17.33)
• **Chapter 17.34 (POS)** — Allowed Uses **§ 17.34.030**; Development Standards **§ 17.34.040** (Table 17.34.040‑1). (Chapter 17.34)
• **Chapter 17.36 (PFS)** — Allowed Uses **§ 17.36.030**; Development Standards **§ 17.36.040**; Emergency shelter standards **§ 17.36.060**. (Chapter 17.36)
• **Overlay districts** and definitions: **§ 17.30.080**; **Chapter 17.35 (RM‑10)**; **§ 17.36.070 (RM‑20/40)**; **Chapter 17.37 (Parker Ave Overlay)**. (§ 17.30.080)
• **ADUs**: **Chapter 17.52** (purpose and zones allowed; definitions; objective standards). (Chapter 17.52)
• Landscape screening: **Chapter 17.50**. (Chapter 17.50)
• Atherton_ZoningCode.md

• Official Atherton code library