Local zoning · Hidden Hills

Hidden Hills — Land Use

Land Use under the Hidden Hills local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

This page explains what the Hidden Hills municipal zoning ordinance actually allows and restricts for land use inside the City limits. It summarizes the ordinance’s zoning districts, the permitted and conditional uses, and the most decision-relevant development rules (setbacks, lot size, height, coverage) you will need to check before proposing work. All standards below are cited to the local code; where the code is silent I note that the material is "Not found in retrieved materials" and advise to Verify with the jurisdiction.

How to use this page

  • If you need the official map to see which district your parcel sits in, the ordinance makes the Official Zoning Map part of the code (see § 5-2B-3 ).
  • For technical rules (parking, lot coverage, building height), consult the specific district subsections cited below and the city's Hidden Hills Development Standards page.

Zoning districts (district-by-district)

The code establishes six base zones: RA-S, RA-S-2, R-1, C-R (Commercial-Restricted), C-U (Community Uses), and the AH-O (Affordable Housing Overlay) that sits on CR parcels (§ 5-2B-2 ). Each district summary below gives the ordinance’s stated purpose/typical uses and the key dimensional rules you’ll use to screen feasibility.

RA-S (Residential Agriculture Suburban)

  • Purpose / typical permitted uses: single-family residences, accessory residential buildings, agriculture/horticulture (nurseries, orchards, vineyards), stables and corral areas for domestic animals (not commercial boarding), and standard residential accessory structures (§ 5-2C-1; § 5-2C-2 ).
  • Key dimensional standards (decision-relevant):
    • Minimum lot area: 1 acre (§ 5-2C-2:A; ).
    • Maximum lot coverage: 25% of net lot area (buildings and accessory buildings) (§ 5-2C-2:C; ).
    • Minimum lot width: 150 ft average (§ 5-2C-2:D; ).
    • Height envelope/cap: tiered caps based on roof ridge distance to frontage (e.g., roof ridge cap commonly 26–30 ft depending on setback; see the formulas) (§ 5-2C-3; ).
    • Front / side / rear yard standards and minor-structure allowances appear throughout the RA-S rules (see § 5-2C-2—§ 5-2C-5; ).
  • Where it applies: parcels mapped to RA‑S on the Official Zoning Map (§ 5-2B-3 ).

Notes: the RA‑S regime is the code’s most restrictive residential/agriculture district and contains specific rules governing barns, corrals, outdoor lighting, fences, and tree protection; read § 5-2C-2—§ 5-2C-5 for detail .

RA-S-2 (Residential Agriculture Suburban‑2)

  • Purpose / typical permitted uses: essentially the RA‑S program scaled for slightly different lotting; the RA‑S‑2 zone defaults to RA‑S requirements except where RA‑S‑2 explicitly differs (§ 5-2D-3; ).
  • Key dimensional standards: the ordinance says "property within the RA‑S‑2 Zone shall meet all requirements of the RA‑S Zone" unless otherwise stated (§ 5-2D-3; ).
  • Where it applies: parcels mapped RA‑S‑2 on the Official Zoning Map (§ 5-2B-2; ).

Practical guidance: treat RA‑S‑2 parcels like RA‑S for setbacks, coverage, and heights unless you find a specific RA‑S‑2 exception in the map notes or parcel-specific ordinance amendment; Verify with the jurisdiction for parcel-specific exceptions.

R-1 (Residential)

  • Purpose / typical permitted uses: single‑family residences and their normal accessory uses (private garages, playhouses, small accessory structures), Accessory Dwelling Units (ADUs/JADUs) are allowed under the ADU article, transitional/supportive housing built and operated as a single-family residence, licensed residential facilities, and small farm worker housing (§ 5-2E-1; ).
  • Key dimensional standards:
    • Front setback: 35 ft measured from road easement line to closest supporting member (§ 5-2E-4:A; ).
    • Side setbacks: 25 ft if abutting RA‑S, otherwise 5 ft when abutting another R‑1 (§ 5-2E-4:B; ).
    • Rear yard: 25 ft when abutting RA‑S, 15 ft when abutting R‑1, 5 ft when abutting commercial-designated property (§ 5-2E-4:C; ).
    • Other RA‑S rules apply where R‑1 is silent (lot coverage, pedestrianways, minor-structure rules) (§ 5-2E-5; ).
    • Second-floor ratio: second-floor area may not exceed 50% of first‑floor area in most instances (§ 5-2C-12/C similar provisions; ).
  • Where it applies: mapped R‑1 parcels per the Official Zoning Map (§ 5-2B-3; ).

Note on ADUs: the code expressly permits ADUs/JADUs and includes detailed ADU standards (setbacks, parking exceptions, lot coverage caps for ADUs) in Article P; see the ADU rules (§ 5-2P-7) for how an ADU fits into R‑1 lots (§ 5-2E-1; § 5-2P-7 ). For ADU development check state ADU law and the city ADU article; guidance and links are below and on the city's Hidden Hills ADUs page.

C‑R (Commercial‑Restricted / shown as CR in the text)

  • Purpose / typical permitted uses: limited commercial activity that is primarily office and low‑impact commercial uses: professional, executive, administrative and sales offices, with other uses allowed only if enclosed and compatible with the surrounding residential character (§ 5-2F-1; ).
  • Conditional uses and prohibitions:
    • Conditional: retail foodservice (restaurants), retail and service stores, and other uses the Planning Agency determines compatible (conditional use permit required) (§ 5-2F-2; ).
    • Prohibited: theaters, nightclubs, motor vehicle sales/services, and other uses listed as prohibited (§ 5-2F-3; ).
  • Key dimensional standards (detailed site standards apply):
    • Max FAR: 1:1 (the baseline) (§ 5-2F-5:A; ).
    • Minimum lot area for subdivision: 20,000 sq ft (§ 5-2F-5:B; ).
    • Height envelope/cap: typically 30 ft and no more than two stories unless Architectural and Site Plan review finds additional height appropriate (§ 5-2F-5:C; ).
    • Yards: front/side/rear all commonly 25 ft minimum — parking may be allowed in yard areas with landscape buffering for residential adjacency (§ 5-2F-5:D; ).
    • Landscape and walls: six‑foot decorative masonry walls required along side/rear that abut residential zones; required landscaping to screen parking and create visual buffer (§ 5-2F-5:E–F; ).
    • Design and signage: Architectural and Site Plan Review is required and establishes architectural style, sign size and placement, roof/roof‑pitch expectations, and window orientation to avoid overlooking adjacent residential yards (§ 5-2F-6; ).
  • Where it applies: parcels zoned CR on the Official Zoning Map; the city also created an Affordable Housing Overlay (AHO) that sits over selected CR parcels to permit lower‑income multi‑family housing when development standards are met (§ 5-2F-9; ).

Practical note: if your proposal is commercial or mixed‑use, expect mandatory Architectural & Site Plan Review and possibly additional conditional use requirements; the Planning Agency can also authorize incentives (higher FAR or reduced yards) where design performance criteria are met (§ 5-2F-6:C; ).

C‑U (Community Uses)

  • Purpose / typical permitted uses: properties owned by the City or other public land for civic uses — any public purpose may be allowed on such C‑U property with Planning Agency review after public hearing (§ 5-2G-1; ).
  • Key rules: the code gives the Planning Agency broad discretion to approve public-purpose uses on city-owned C‑U property after hearing (§ 5-2G-1; ).
  • Where it applies: parcels mapped C‑U on the Official Zoning Map (§ 5-2B-2; ).

AH‑O (Affordable Housing Overlay)

  • Purpose: the AH‑O is an overlay to implement the city’s Housing Element by allowing lower‑income multiple‑family dwellings on designated CR parcels at required densities and affordability controls (§ 5-2F-9; ).
  • Key standards:
    • Minimum density: 20 units/acre for lower‑income multiple‑family developments (§ 5-2F-9:E.1; ).
    • Minimum project size: 16 units (§ 5-2F-9:E.2; ).
    • Required affordable housing agreements or covenants to ensure long‑term affordability (recording requirements; § 5-2F-9:F; ).
    • AHO‑mapped sites are shown on the Official Zoning Map; site plan review is required for projects other than the by‑right lower‑income multi‑family use areas (§ 5-2F-9:B–D; ).

Important: AHO development is subject to specific recorded affordability covenants and to site plan/architectural approvals before building permits are issued (§ 5-2F-9:F; ).

Quick reference table — most decision-relevant standards and permitted uses

District Typical permitted uses Key development limits you will check first Code Reference
RA‑S Single‑family residence; accessory buildings; agricultural uses; stables Min lot area 1 acre; Max coverage 25%; height envelope (e.g., 26–30 ft roof ridge rules) § 5-2C-1; § 5-2C-2; § 5-2C-3
RA‑S‑2 Same as RA‑S unless otherwise noted Follow RA‑S rules unless specific exception applies § 5-2D-3
R‑1 Single‑family + ADUs, small licensed residential facilities Front setback 35 ft; Side 25/5 ft (depending on abutting zone); Rear 25/15/5 ft § 5-2E-1; § 5-2E-4
CR Professional/administrative offices; limited retail by CUP Max FAR 1:1; Min lot area for resubdivision 20,000 sf; yards typically 25 ft; height envelope ~30 ft/2 stories § 5-2F-1; § 5-2F-5; § 5-2F-6
C‑U Public/civic uses on City‑owned parcels Planning Agency approval after public hearing § 5-2G-1
AH‑O Lower‑income multi‑family (on mapped CR parcels) Min density 20 units/acre; Min 16 units; affordability covenants required § 5-2F-9:E–F

(For ADU-specific dimensional exceptions and parking rules see the ADU article § 5-2P-7; .)

Process highlights and discretionary controls

  • Architectural & Site Plan Review: required for most non‑exempt projects and for all CR development; the Planning Agency can require design elements, limit visibility, and impose conditions. See § 5-2F-6 and the general Architectural and Site Plan Review and procedural rules in Article H (site plan review) (§ 5-2F-6; § 5-2H-5 onward) .
  • Conditional Use Permits (CUPs): uses listed as conditional require a CUP; CUP criteria include site adequacy, traffic access, compatibility with surrounding uses, General Plan consistency, and public necessity (§ 5-2I-4; ).
  • Variances and nonconforming structures: expansions of legally nonconforming CR structures are limited (e.g., expansions capped at 600 sq ft for some CR nonconforming structures) and variances are available only where strict application produces practical difficulties (§ 5-2F-4; § 5-2I-4; ).
  • Parking: baseline parking ratios and loading requirements are expressed in the CR development standards (e.g., retail 1 space / 250 sf, office 1 / 300 sf; conditional uses minimums set by Planning Agency) and general parking rules require spaces to be on the same parcel or within 400 ft of the building (§ 5-2F-5:G; § 5-2? parking rules) .

Also link to the city’s Hidden Hills Development Standards page for the detailed dimensional tables in local practice, and to the California Building Standards Code when the ordinance defers to building/fire code requirements.

Checklist — what an applicant must satisfy (preliminary)

  • Confirm parcel zoning on the Official Zoning Map and read the applicable district rules (§ 5-2B-3) .
  • Confirm permitted vs. conditional status for the proposed use (see district § cited above; CUP criteria § 5-2I-4) .
  • Check dimensional feasibility: lot area, coverage, height, front/side/rear setbacks, and any ridgeline limitations (§ 5-2C-2; § 5-2C-3; § 5-2E-4; § 5-2K-1) .
  • If in CR or proposing non‑residential work, prepare for Architectural & Site Plan Review and community/agency referrals (§ 5-2F-6; § 5-2H) .
  • For ADUs, verify compliance with local ADU article § 5-2P-7 and applicable state ADU law (setbacks, parking exceptions) (§ 5-2P-7; Gov. Code referenced) .
  • Check parking and loading standards and whether the Planning Agency may set a different minimum for conditional uses (§ 5-2F-5:G) .
  • Prepare landscape/screening plans (yards adjacent to residential uses require landscaped buffers; perimeter fence rules apply) (§ 5-2F-5:F; § 5-2C-5) .
  • Determine whether any overlay (AH‑O) or special policies apply to your parcel (AH‑O mapping, AHO density/affordability rules) (§ 5-2F-9) .
  • Verify need for variances or other exceptions and follow notice/hearing procedures (§ 5-2I-4) .

Risks & Ambiguities

Issue Why it matters What to verify
Overlay applicability (AH‑O) A parcel inside the AH‑O is subject to density/affordability rules that can override normal CR treatment (§ 5-2F-9) Confirm overlay mapping on the Official Zoning Map and read § 5-2F-9 for the density/covenant rules
Hidden Hills Community Association (HHCA) architectural review The code repeatedly references Community Association certification and subcommittee approvals as part of the city review path; CC&R/HOA input can affect permitted details (§ 5-2H / site plan process) Verify whether HHCA approval is required for the parcel and obtain written HHCA certification where the code expects it (§ 5-2H exemptions/coordination)
Ridgeline restrictions Ridgeline rules add extra constraints (no ridgeline construction, special review) and can block otherwise code‑compliant projects (§ 5-2K‑1—3) Confirm whether your lot is affected by the ridgeline definition; if so, run the ridgeline review standards (§ 5-2K) early
Parcel‑specific nonconforming rights Nonconforming structures have limited expansion rights (e.g., 600 sq ft limit in CR for certain expansions) § 5-2F-4 Verify legal nonconforming status in City records and consult § 5-2F-4 for allowable expansions
ADU state law interaction State ADU law can limit local controls (setback/parking exceptions) — the local ADU article implements but must be read alongside state rules (§ 5-2P-7 and Gov. Code) For ADUs, read § 5-2P-7 carefully and confirm where state law preempts a stricter local rule; see the city's ADU article and state ADU law guidance
Ambiguous or missing parcel-specific standards The code contains many general rules but parcel history, recorded easements, or amendments may change what applies Verify with the Planning Department for recorded amendments, map notes, easements and the exact zoning line; "Verify with the jurisdiction."

Plain‑English summary

Hidden Hills zoning is a conservative, design‑focused ordinance that keeps most private property in RA‑S/RA‑S‑2 and R‑1 for single‑family/residential uses and concentrates limited, carefully designed offices or community uses in CR and C‑U zones. Typical residential parcels will face large setbacks (for example, 35 ft front in R‑1), low lot coverage (25% in RA‑S), and design/site plan review for most non‑exempt projects; permitting risk often comes from local design review, ridgeline rules, and HOA/community association requirements. Check the exact § citations above for the black‑and‑white rules applicable to your parcel and Verify with the jurisdiction for parcel‑specific exceptions (§ 5-2B-3; § 5-2C-2; § 5-2E-4) .

Source References

  • Zoning districts and purpose (zones established): § 5-2B-2
  • Official Zoning Map rules: § 5-2B-3
  • RA‑S permitted uses, lot area, coverage, height: § 5-2C-1, § 5-2C-2, § 5-2C-3
  • RA‑S‑2 reference to RA‑S rules: § 5-2D-3
  • R‑1 permitted uses and yard/setback rules: § 5-2E-1, § 5-2E-4, § 5-2E-5
  • CR permitted/conditional/prohibited uses and CR development standards: § 5-2F-1, § 5-2F-2, § 5-2F-3, § 5-2F-5
  • CR Architectural & Site Plan Review and incentives: § 5-2F-6
  • Site Plan Review procedures and notice: § 5-2H (procedures and notice)
  • Affordable Housing Overlay (AHO) rules/density: § 5-2F-9
  • Nonconforming expansions in CR, variance limits: § 5-2F-4; CUP/variance criteria § 5-2I-4
  • ADU article excerpts and ADU-specific rules (setbacks, parking): § 5-2P-7 (ADU standards)
  • Ridgeline standards and purpose: § 5-2K-1—3
  • Wireless/satellite antenna and communications facility standards (where relevant to use/site review): Chapters 5-12 and 5-13 (wireless/satellite)

Also use the city's internal explanatory pages:

Sources

Retrieved passages

  • Hidden Hills Zoning Code (ARTICLE E.) High relevance
  • Hidden Hills Zoning Code (Chapter other) High relevance
  • Hidden Hills Zoning Code (Section prior) High relevance
  • Hidden Hills Zoning Code (ARTICLE B.) High relevance
  • Hidden Hills Zoning Code (Title occur) High relevance
  • Hidden Hills Zoning Code (§ 2) High relevance
  • Hidden Hills Zoning Code (Title and) High relevance
  • CBC § 66321 (§ 66321) High relevance
  • Hidden Hills Zoning Code (§ 2) High relevance
  • Hidden Hills Zoning Code (Title and) Medium relevance
  • Hidden Hills Zoning Code (Section as) Medium relevance
  • Hidden Hills Zoning Code (§ 2) Medium relevance
  • Hidden Hills Zoning Code (§ 3) Medium relevance
  • CFC § 65852.21 (Article is) Medium relevance
  • Hidden Hills Zoning Code (§ 11) Medium relevance
  • Hidden Hills Zoning Code (Title and) Medium relevance
  • Hidden Hills Zoning Code (Section 65584) Medium relevance
  • Hidden Hills Zoning Code (Title and) Medium relevance
  • Hidden Hills Zoning Code (§ 10) Medium relevance
  • CBC § 5 (Section 5-5B-1) Medium relevance
  • Hidden Hills Zoning Code Medium relevance
  • Hidden Hills Zoning Code (Chapter 2I-4) Medium relevance

Cited sections

Frequently asked questions

What can I build on an R‑1 lot in Hidden Hills?

You may build a single‑family residence and normal residential accessory buildings (private garage, small accessory structures), and the code explicitly permits Accessory Dwelling Units (ADUs/JADUs) subject to the ADU article; see § 5-2E-1 and the ADU rules § 5-2P-7 for dimensional and parking exceptions .

What are Hidden Hills setback requirements for R‑1 lots?

Typical R‑1 setbacks are front 35 ft, side 25 ft if abutting RA‑S (otherwise 5 ft), and rear 25 ft when abutting RA‑S (15 ft abutting R‑1; 5 ft abutting commercial); see § 5-2E-4 for the full text and applicability .

Do I need design review in Hidden Hills for a home remodel or addition?

Possibly. Many projects require Architectural and Site Plan Review unless the Planning Director finds the project meets the small-exemption criteria (e.g., increases under certain square‑foot thresholds). See the site plan review exemptions and procedures (planning director exemptions, public notice, Planning Agency hearing) in the site plan/architectural review articles (§ 5-2H and related provisions) .

What counts as a permitted use in the CR (Commercial‑Restricted) zone?

By right the CR zone allows professional, executive, administrative and sales offices and other enclosed, low‑impact commercial uses; restaurants and retail require a conditional use permit and many uses are specifically prohibited (theater, nightclub, motor vehicle sales) — see § 5-2F‑1—3 .

How does the Affordable Housing Overlay (AHO) change what I can do on a CR parcel?

AHO permits lower‑income multiple‑family dwellings at a minimum density of 20 units/acre with a minimum project size of 16 units, subject to affordability covenants and site plan/architectural review; see § 5-2F-9 for required findings and recording requirements .

Are ADUs allowed and what setbacks/parking do they need in Hidden Hills?

Yes — the code allows ADUs/JADUs under Article P. ADUs have specific standards: 4‑ft side/rear setbacks (in many cases), a lot coverage cap for ADUs (local ADU rules may limit total coverage to 25% in certain contexts), and parking requirements can be waived under state/local exceptions in certain circumstances (§ 5-2P‑7). Check § 5-2P‑7 alongside state ADU law for interplay and exceptions .

What is the minimum lot size in RA‑S?

The ordinance sets the minimum lot area in RA‑S at 1 acre (excluding certain easements), and lot width minimum 150 ft; see § 5-2C-2 for the full breakdown (coverage, net area definition) .

When is a conditional use permit required?

A CUP is required when the use is listed as conditional in the zone or when the Planning Agency determines a discretionary approval is needed; CUP criteria require showing site adequacy, traffic access, compatibility, and consistency with the General Plan (see § 5-2I-4 and the conditional‑use lists in each zone such as § 5-2F-2 for CR) .

Are there special rules for ridgeline lots?

Yes — the ordinance has a Ridgeline Development Article that imposes heightened review and restrictions to prevent silhouetting and protect visual resources; see § 5-2K for the definition of ridgeline and the review requirements .

What happens if my structure is legally nonconforming?

Nonconforming structures have controlled expansion rights and certain limits (for example, CR expansions capped in some cases at 600 sq ft), and any enlargement or change will be reviewed under the nonconforming structure rules and Planning Agency procedures (see § 5-2F-4) .

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