Local zoning · Atherton

Atherton — Landscaping and Screening

Landscaping and Screening under the Atherton local zoning and planning code, with the controlling citations.

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Last reviewed: July 3, 2026

Overview

This page summarizes what the Town of Atherton’s zoning code requires for landscape screening, trees, fences, and walls. The primary local rules are in the zoning code’s Chapter 17.50 — Landscape Screening and Chapter 17.46 — Fences and Walls. Where district-level standards affect screening (multifamily overlays, park/open-space, Parker Avenue overlay) those are noted and cross-referenced to the controlling code. See the Town’s development rules for site-level dimensions and review processes in the Atherton Development Standards and the zoning map in Atherton Zoning.

What the code actually requires (quick summary)

  • Landscape screening is required for certain new construction and accessory structures that meet height/distance thresholds. See § 17.50.020.
  • General screening rules: front/side/rear yards (except front yards contiguous to a street) must be screened; no plantings within five feet of a building where Fire Department conflicts could occur; plantings must be maintained and irrigated. See § 17.50.030, § 17.50.040.
  • Minimum planting sizes and timing vary by lot type (non‑hillside, hillside, tower/projection). For non‑hillside lots minimum installed container sizes are 24‑inch box and must reach approximately 22 ft at maturity; hillside and tower projections have larger minimums (e.g., 36‑inch box for towers). See § 17.50.070, § 17.50.080, § 17.50.090.
  • A list of prohibited tree species is enforced for required screening plans (e.g., all eucalyptus species, Monterey pine, mimosa, tree of heaven). See § 17.50.070–080.
  • Landscape screening plans must follow the Town Arborist’s checklist and the applicant must sign a continuing landscape agreement to prevent removal/alteration without approval. See § 17.50.120, § 17.50.050.
  • Fences and walls are regulated separately: most interior fences may be up to 6 ft; certain locations and streets allow 8 ft; front‑line visibility triangles and street intersections have reduced maximums (e.g., 3 ft in visibility triangles). See Chapter 17.46 (especially § 17.46.020 and § 17.46.030).

District-by-district breakdown (how screening is applied across Atherton)

Note: the code organizes districts in Title 17. The chapter numbers for each district are given below; where the zoning chapters themselves did not include landscaping text, the district summary references the landscape rules in Chapter 17.50 and other district-level development sections that explicitly require screening.

R-1A (Residential District — R-1A)

  • Purpose / typical uses: single‑family residential (chapter listed as § 17.32). The zoning plan and single‑family allowance are established in Title 17. § 17.32 (chapter listing).
  • Screening obligations: Projects that trigger Chapter 17.50 (for example new construction over 18 ft above grade) must provide landscape screening per § 17.50.020 and general standards § 17.50.030. If an adjacent property is R‑1, the code imposes larger adjacent setbacks for multifamily projects — see § 17.36 (R‑1 adjacent setbacks).
  • Key dimensional standards that commonly affect screening: front/side/rear yard rules and side‑yard tables appear elsewhere in Title 17 (see § 17.38 and RM/PFS sections for comparative setbacks). If you need parcel‑level setbacks, consult the underlying district chapter and the Atherton Development Standards. Not found in retrieved materials: a single consolidated “R‑1A screening matrix.”

R-1B (Residential District — R-1B)

  • Purpose / typical uses: single‑family residential, often smaller lot variants (chapter § 17.33).
  • Screening obligations: same Townwide screening chapter applies; front yards contiguous to streets are exempt from screening § 17.50.030; pedestrian pathway rules and certain pathway setbacks reference R‑1 adjacency (e.g., no pedestrian paths within 10 ft of an R‑1 adjacent property). See § 17.50.030 and overlay/multifamily site rules.

Park & Open Space (POS) — § 17.34

  • Purpose / typical uses: parks, open space and related uses (chapter § 17.34 listed in Title 17).
  • Screening / landscape interaction: lot‑coverage and landscape area rules require that all parts of the lot not covered by buildings or impervious surfaces be landscape area and be maintained; landscape areas shall not interfere with heritage tree protection. See § 17.35.030.D (applies where POS combining designation affects multifamily development rules).

RM‑10 Multifamily Overlay — § 17.35 (RM‑10)

  • Purpose / typical uses: multifamily development overlay applied over some properties; establishes multifamily site standards. See § 17.35.
  • Screening obligations and special standards: multifamily site design explicitly requires landscape screening along property lines adjacent to new structures in conformance with Chapter 17.50; it adds more specific multifamily standards: plantings generally must reach 12 ft within 3 years, all trees/shrubs shall be evergreen, and existing opaque landscaping of 12 ft may substitute. See § 17.36/17.35 excerpts on landscape screening and plant height.
  • Setbacks: RM overlays modify setback rules; where adjacent to R‑1 parcels the code requires an R‑1 adjacent setback of 50 ft (minimum) unless exemptions apply. See § 17.36 (R‑1 adjacent setbacks).

PFS — Public Facilities & Schools — § 17.36

  • Purpose / uses: public facilities and schools (chapter § 17.36). Landscape screening expectations for properties that develop under PFS are addressed in multifamily/overlay sections where applicable; lot coverage/landscape area obligations still apply. See § 17.36 and the development standards that require screening in some project types.

Parker Avenue Overlay (P) — § 17.37

  • Purpose: special overlay for lots along Parker Avenue — allows specific floor area/height/setback modifications while seeking to minimize privacy and view impacts on neighbors. See § 17.37.
  • Screening: overlay includes a specific requirement that property lines adjacent to new structures shall be screened according to Chapter 17.50 and the more restrictive overlay standards; overlay also contains unique height and setback rules that will affect how screening is designed (see § 17.37.040).

Quick reference table — most decision‑relevant standards

Topic What the code requires Code reference
When screening is required New construction over 18 ft above grade, or accessory structures over certain heights/within specific distances to property lines § 17.50.020
General screening rule All front/side/rear yards must be screened per Chapter 17.50 (front yards contiguous to streets excepted) § 17.50.030
Planting setback from building No plantings within 5 ft of the building where conflict with Fire Dept. requirements may occur § 17.50.030(C)
Installation timing All required screening installed before final inspection/CO (or deposit/agreement) § 17.50.060
Minimum sizes (non‑hillside) 24‑inch box at installation; reach ~22 ft at maturity within 5 years § 17.50.070
Minimum sizes (hillside) 36‑inch box at installation; reach ~22 ft at maturity § 17.50.080
Towers / architectural projections Minimum two trees of 36‑inch box; plant inward toward main residence § 17.50.090
Heritage trees Identify heritage trees/TPZ on plans; proposed new landscaping must be located ≥ 3× TPZ from heritage trees § 17.50.100
Landscape plan submittal Must follow Town Arborist checklist; landscape screening agreement required § 17.50.120 & § 17.50.050
Permits for fences/walls Zoning clearance required for fences/walls; typical max 6 ft for fences between private properties (some street frontages/streets allow 8 ft) § 17.46.020 & § 17.46.030
Prohibited species for required screening e.g., any species of eucalyptus, Pinus radiata, Ailanthus altissima, Albizia julibrissin § 17.50.070–080

Practical guidance / interpretation (plain English, decision-focused)

  • If your project raises the finished building or accessory structure above 18 ft or places tall accessory elements close to property lines, plan for a landscape screening plan prepared to the Town Arborist checklist; you will need a signed landscape screening agreement before the planning/building application is “complete.” § 17.50.020, § 17.50.050.
  • Expect the Town Arborist to exercise discretion on species selection, spacing, and container sizes: the code sets minimums (24" or 36" boxes) but the arborist can demand larger material for effectiveness. § 17.50.070–090.
  • For multifamily or overlay projects consult the overlay chapter in addition to Chapter 17.50 — multifamily rules add evergreen requirements and specific three‑year growth expectations (e.g., 12 ft in three years for some multifamily contexts). § 17.35 / § 17.36 and § 17.50.
  • Don’t assume fences replace trees: fences and walls are separately regulated (permit/zoning clearance required) and maximum heights vary by location; for ADUs there are special screening options including 8‑ft solid fences in some reduced setback situations. See Chapter 17.46 and § 17.52 (ADU rules). If you are designing an ADU, check the ADU chapter for required screening options. § 17.46.030, § 17.52.040.
  • Landscaping must be irrigated with a water‑efficient automatic system at installation and maintained in healthy condition; the Town may require replacement if materials fail. § 17.50.040.

(If your plan affects parking or access, coordinate with Atherton Parking and the site setbacks in the Atherton Development Standards. For project aesthetics or where design alteration is likely, expect design review.)

Checklist (what an applicant must satisfy)

  • Confirm whether Chapter 17.50 applies to the project (trigger thresholds in § 17.50.020)
  • Prepare a Landscape Screening Plan following the Town Arborist checklist and include tree species, sizes, TPZs for heritage trees, irrigation, and maintenance commitments (§ 17.50.120, § 17.50.100)
  • Include plant sizes appropriate to lot type: 24‑inch box min for non‑hillside; 36‑inch box for hillsides/tower projections as applicable (§ 17.50.070–090)
  • Sign and submit the landscape screening agreement before the planning/building application is deemed complete (§ 17.50.050)
  • Plan for installation before final inspection/CO or post a deposit/agreement if a phased installation is approved (§ 17.50.060)
  • If installing fences or walls, obtain zoning clearance and follow location/height limits (see Chapter 17.46)
  • Verify that no prohibited tree species are used in required screening (§ 17.50.070–080)

Risks & Ambiguities

Issue Why it matters What to verify
When Chapter 17.50 applies to partial additions Only the portions meeting the specified height/distance triggers are subject to screening — partial triggers can be confusing Verify which elevations and specific building faces exceed 18 ft or the accessory‑structure thresholds in § 17.50.020
Heritage tree interactions New plantings must be located a minimum 3× TPZ from heritage trees; construction activities may further restrict planting areas Confirm heritage tree locations/TPZ via Chapter 8.10 and follow § 17.50.100 (tree preservation plan required).
Overlay vs base district conflicts Overlays (e.g., RM‑10, Parker) may impose more restrictive standards or different setbacks that affect screening Check the overlay chapter (e.g., § 17.35 and § 17.37) and apply the most restrictive standard where conflicts exist.
Species choice vs arborist discretion The code lists prohibited species and minimum sizes, but the Town Arborist can require different species/size Confirm proposed species and sizes with the Town Arborist — code gives discretion, see § 17.50.070.
Whether fences can substitute for plant screening ADU rules allow 8‑ft fences in some reduced setback cases, but fences still need zoning clearance and may not replace required plantings elsewhere For ADUs consult § 17.52 and for fences Chapter 17.46; verify on a parcel‑by‑parcel basis.

Plain-English Summary

Atherton requires private projects that are tall or near property lines to install and maintain landscape screening (trees, shrubs, irrigation) sized to achieve privacy within a few years; the arborist enforces species, sizes, and a signed maintenance agreement, and fences/walls have their own height and permitting rules. Key rules live in Chapter 17.50 (landscape screening) and Chapter 17.46 (fences & walls).

Source References

  • Title 17 ZONING — Chapter list (district chapter numbers) — Title 17 (Chapters list).
  • § 17.50.010 – 17.50.140, Chapter 17.50 Landscape Screening (purpose, applicability, general requirements, maintenance, planting sizes, prohibited species, installation, plans, violations/appeals).
  • § 17.46.010 – 17.46.050, Chapter 17.46 Fences and Walls (permit requirements, heights, development standards).
  • § 17.35 / § 17.36, RM‑10 multifamily overlay and PFS development standards (lot coverage, landscape area obligations, R‑1 adjacent setbacks, evergreen/height expectations).
  • § 17.37, Parker Avenue Overlay District — development standard modifications and screening applicability.
  • Chapter 17.52, Accessory Dwelling Units (ADU screening and special provisions) — referenced where ADU‑specific screening/fence allowances appear.

Sources

Retrieved passages

  • Atherton Zoning Code (§ 1) High relevance
  • Atherton Zoning Code (Title 17) High relevance
  • Atherton Zoning Code (§ 1) High relevance
  • Atherton Zoning Code (Chapter and) High relevance
  • Atherton Zoning Code (§ 1) High relevance
  • Atherton Zoning Code (§ 1) High relevance
  • Atherton Zoning Code (§ 1) High relevance
  • Atherton Zoning Code (section 3.2) High relevance
  • Atherton Zoning Code (Title 17) High relevance
  • Atherton Zoning Code (section 16.24.050) High relevance

Cited sections

Frequently asked questions

What triggers a landscape screening requirement in Atherton?

If your project is new construction that exceeds 18 ft above grade, or an accessory structure over certain heights close to property lines (see the distance/height thresholds), Chapter 17.50 applies. See § 17.50.020.

How big must trees be when installed for required screening?

Minimum container sizes depend on lot type: 24‑inch box for non‑hillside lots and 36‑inch box for towers/hillside requirements, with expected maturity heights ~22 ft; the Town Arborist may require larger sizes. See § 17.50.070–090.

Can I use an 8‑foot fence instead of planting for an ADU?

Under certain ADU provisions the code allows an 8‑ft solid, opaque fence for screening when ADUs are within reduced setback areas or above detached garages, but the ADU and fence still must comply with the ADU chapter and obtain zoning clearance. See § 17.52 and Chapter 17.46.

Are any tree species prohibited for mandatory screening?

Yes — the code lists prohibited species for required screening plans (for example, all eucalyptus species, Monterey pine, mimosa, tree-of-heaven). See § 17.50.070–080.

Do I need to submit a landscape agreement and when?

Yes — a signed landscape screening agreement must be submitted before the planning or building application is considered complete to ensure ongoing maintenance and prevent unauthorized removal. See § 17.50.050.

When must screening be installed?

All required landscape screening shall be installed prior to final inspection or issuance of a certificate of occupancy unless the building official permits phased installation; otherwise the applicant may need to post a deposit/agreement. See § 17.50.060.

What are the fence height limits next to a street or at a driveway vision triangle?

Typical maximum interior fence/wall height is 6 ft; certain streets/locations allow 8 ft; at intersections/visibility triangles the max may be 3 ft to maintain sight lines. See Chapter 17.46 (especially § 17.46.030).

Do heritage trees constrain where I can plant new screening trees?

Yes — landscape screening plans must show heritage trees and their Tree Protection Zones; proposed new landscaping must be located at least three times the TPZ away from each heritage tree and include a tree preservation plan consistent with Chapter 8.10. See § 17.50.100.

If my lot is in the RM‑10 overlay, are there extra landscape requirements?

Yes — RM overlays and the multifamily standards impose additional requirements (e.g., evergreen plantings, plants to reach 12 ft within 3 years in some multifamily contexts) and require compliance with Chapter 17.50; when in conflict, the more restrictive standard applies. See § 17.35 / § 17.36 and § 17.50.

Where can I check setback, parking, and design review impacts on my landscape plan?

Check the district development chapters and the Town’s site standards; coordinate screening with site parking and setbacks (see Atherton Parking, Atherton Development Standards, and expect design review where applicable via Atherton Design Review). The Town’s arborist checklist is required for plan submittal.

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