Local zoning · Rolling Hills

Rolling Hills — Nonconforming Uses

Nonconforming Uses under the Rolling Hills local zoning and planning code, with the controlling citations.

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Last reviewed: July 2, 2026

Overview

This page summarizes how the City of Rolling Hills treats nonconforming uses, nonconforming structures, and nonconforming lots under the local zoning ordinance (Title 17). It explains what rights survive a zoning change, what actions terminate a nonconforming status, and the reconstruction/maintenance limits that apply in Rolling Hills. The primary regulatory text is Chapter 17.24 of the Zoning Ordinance (Title 17) and related definitions and review/appeal chapters. § references below point to the controlling code language.

What the code says (core rules, plain-English)

  • The City recognizes legal nonconforming rights but limits them to protect health, safety and welfare (purpose declared in § 17.24.010) .
  • A lawful pre-existing use or structure that no longer conforms because of later ordinance changes is a legal nonconforming use/structure/land as defined in § 17.12.140; those definitions govern when the rules below apply.
  • Continuance: Nonconforming uses and structures may continue in their existing form only in accordance with Chapter 17.24 (continuance rule in § 17.24.020) .
  • No expansion: A nonconforming use may not be expanded or extended to new parts of a building, and a nonconforming structure may not be altered to increase the degree of nonconformity (§ 17.24.030(B), § 17.24.040(A)) .
  • Discontinuance kills rights: If a nonconforming use is discontinued for any period, the nonconforming right is lost and future use must conform (§ 17.24.030(C)) .
  • Reconstruction after damage: Different rules apply depending on use and zone — residential primary structures in the RA‑S zone may be rebuilt to pre‑damage conditions and may have limited additions (see § 17.24.050(A)); other nonconforming structures can be restored only if destruction is not more than 50% of assessed value (§ 17.24.050(B)). Time limits for commencing work apply.
  • Maintenance allowed: Ordinary maintenance and repairs that do not increase nonconformity are allowed (§ 17.24.060) .
  • Applicability forward: The chapter applies to future nonconformities created by rezoning or development standard changes (§ 17.24.070) .
  • Public service/utility buildings are exempt from some limits so long as use and land area are not changed (§ 17.24.080) .
  • Revocation: The Planning Commission (and City Council on appeal) may revoke legal nonconforming status after a hearing for grounds listed in Chapter 17.58 (fraud, violation of conditions, nuisance, etc.) (§ 17.58.010–.040) .

Note: The City code is part of the broader Title 17 Zoning framework; for the overall zoning map and zone rules see the City's Zoning chapter.

District-by-district breakdown (where nonconforming rules matter)

Below are the Rolling Hills districts in which nonconforming issues are most commonly encountered, with the district purpose, typical permitted uses, key dimensional standards, and where the district applies. When a nonconformity arises, Chapter 17.24 rules apply citywide unless a special provision modifies them for a district (for example reduced setbacks described in § 17.24.045 and overlay rules in Chapter 17.17). Links below point to related guidance pages used by applicants.

RA‑S (Residential Agriculture‑Suburban) — RA‑S‑1 and RA‑S‑2

Purpose and typical uses

  • The RA‑S zone preserves large‑lot single‑family residential with equestrian uses and related accessory features; it is divided into RA‑S‑1 and RA‑S‑2 by minimum lot size intent (§ 17.16.010, § 17.08.010).

Key permitted uses (typical)

  • Single‑family residences, limited agricultural/landscape uses, stables and accessory structures subject to Chapter 17.16 and 17.18. See the index of permitted uses in § 17.16.015–.020.

Dimensional and development standards (decision‑relevant)

  • Minimum net lot area: RA‑S‑1 = 43,560 sf, RA‑S‑2 = 87,120 sf. Minimum lot width: 150 ft at any point. Maximum lot coverage by structures = 20%; structures + impervious surfaces ≤ 35%. Height: one story, max 21 ft (stables up to 23 ft) (summary table, 17.16). Front/Rear setbacks = 50 ft; side setback RA‑S‑1 = 20 ft (RA‑S‑2 = 35 ft) but see overlays and reduced setback exceptions.

Where it applies

  • Citywide; the RA‑S zone is the principal residential zone in Rolling Hills and is established in § 17.08.010.

Nonconforming implications

  • Nonconforming homes in RA‑S are governed by Chapter 17.24; reconstruction after casualty follows the special rule for residential structures in § 17.24.050(A) (rebuild to prior condition; limited addition allowed if started within 2 years) .

Overlay Zoning District — OZD‑1 (Overlay over portions of RA‑S‑1)

Purpose and typical uses

  • The OZD‑1 overlay modifies RA‑S‑1 setback rules for specific historic lots identified on the zoning map (Chapter 17.17 intent and applicability).

Key dimensional differences (decision‑relevant)

  • Reduced front yard setback allowed to 30 ft (instead of 50 ft) for single‑family dwellings in OZD‑1, interior side yard may be reduced to existing footprint but not less than 10 ft, street side yard 10 ft; applies only to single‑family dwellings, not accessory structures (§ 17.17.030(B)).

Where it applies

  • Specific lots listed in § 17.17.020; verify lot-specific applicability on the zoning map and code.

Nonconforming implications

  • The OZD‑1 rules supersede inconsistent RA‑S‑1 standards and interact with nonconforming rules (reduced setbacks may be applied when reconstructing or applying Chapter 17.24 provisions) — see § 17.17.030 and § 17.24.045.

Rancho Del Mar Housing Opportunity Overlay — RDMO

Purpose and typical uses

  • The RDMO overlay encourages mixed‑use/affordable housing on a specific parcel (38 Crest Road West) and establishes development rules for housing types (chapter 17.19).

Dimensional/operational highlights

  • Uses permitted include affordable multi‑family, senior housing, emergency shelter, daycare, etc., subject to conditional use or zone clearance as specified. Parking standards for RDMO are explicit in Table 17.19.070A and include unit‑based ratios and EV charging rules (§ 17.19.070A–B). For parking details see the City parking guidance.

Where it applies

  • Applies to the parcel(s) identified in § 17.19.020; it is a narrow overlay, not citywide.

Nonconforming implications

  • Nonconforming uses/structures on RDMO parcels are still subject to Chapter 17.24, but the overlay sets the allowable uses and may require discretionary approvals (conditional use/site plan) before a change of use. Check § 17.19.030 and § 17.24.

PF — Public Facilities

Purpose and typical uses

  • PF permits public facility uses (schools, fire stations, city buildings) and is governed by its own chapter and the general zoning provisions (§ 17.08.010(B)).

Nonconforming implications

  • Public service and utility buildings receive an express limited exemption from Chapter 17.24 so long as modifications do not change land area or land use (§ 17.24.080). Verify on a case‑by‑case basis.

Quick reference table — decision‑relevant nonconforming rules

Topic / Standard Short rule (plain English) Code reference
Definition of nonconforming land/structure/use A lawful pre‑existing parcel/structure/use that no longer meets current zoning is "nonconforming." § 17.12.140
Continuance of rights Nonconforming uses/structures may continue only under Chapter 17.24; illegal uses have no rights. § 17.24.020
Limits on nonconforming uses No expansion into other portions of a building; cannot replace the use with another while the nonconforming use exists; discontinuance voids rights. § 17.24.030(A–C)
Limits on nonconforming structures Cannot alter/expand to increase nonconformity; conforming additions allowed without forcing full compliance. § 17.24.040(A–B)
Reconstruction after casualty Residential (RA‑S) may be rebuilt to prior condition; other structures allowed if damage ≤ 50% assessed value; work must start within 2 years. § 17.24.050(A–C)
Reduced setbacks for certain SF homes For qualifying RA‑S‑1 lots ≤ 1.25 acres, reduced setback options for reconstruction (front to 50 ft or footprint; side min 20 ft, not less than 10 ft in special cases). § 17.24.045
Maintenance allowed Ordinary painting/plumbing/repairs permitted; not a license to enlarge nonconformity. § 17.24.060
Revocation of nonconforming status Planning Commission (after hearing) may revoke for fraud, violation or nuisance; appealable to City Council. § 17.58.010–.040
Site plan / discretionary review triggers Some reconstructions of nonconforming structures are exempt from site plan review per § 17.24.050(C); but other projects will require site plan review per § 17.46.020 (see design review). § 17.24.050(C) and § 17.46.020

Checklist — what an applicant should confirm before proposing work on a nonconforming property

  • Verify whether the parcel/structure/use is a legal nonconforming (lawful when built) under § 17.12.140; obtain historical permits/assessor records.
  • Confirm which zone/overlay applies: RA‑S‑1, RA‑S‑2, OZD‑1, RDMO, or PF (zoning map; see § 17.08.010).
  • Determine whether the proposed activity would expand or increase the nonconformity; expansion is generally prohibited (§ 17.24.030(B); § 17.24.040(A)).
  • If reconstructing after damage, confirm percent destruction (≤ 50% threshold for non‑residential per § 17.24.050(B)) and start/complete timeline (work must begin within 2 years).
  • For residences in RA‑S check whether § 17.24.050(A) or the reduced‑setback rule § 17.24.045 applies (lot size and existing footprint conditions).
  • Confirm whether proposed work triggers site plan review or other discretionary approvals per § 17.46.020 and whether reconstruction is exempt under § 17.24.050(C). See design review.
  • If adding or converting accessory space (ADU/JADU), review Chapter 17.28 and the ADU provisions that limit denial based on nonconforming conditions (see § 17.28.080). See ADUs.
  • If the project affects parking demand or a change of use, confirm parking requirements (explicit overlay parking rules e.g., RDMO Table 17.19.070A) and consult parking.

Risks & Ambiguities

Issue Why it matters What to verify
Loss of nonconforming rights after discontinuance A temporary cessation of the use can terminate legal nonconforming status, forcing full conformance on re‑use (§ 17.24.030(C)). Confirm continuous operation history and dates; obtain documentation proving continuous use.
Extent of destruction when rebuilding For non‑residential/non‑stable structures, >50% of assessed value loss eliminates reconstruction rights under nonconforming rules (§ 17.24.050(B)). Obtain Los Angeles County Assessor records for the fiscal year of damage to compute the percentage.
Whether a proposed alteration “increases the nonconformity” The code bars expansions that worsen the nonconformity, but what that means can be subjective (e.g., moving a wall, changing use). Early meeting with Planning to get a written determination; provide plans showing existing nonconforming footprint vs. proposed. Verify with the jurisdiction.
Interaction with overlays (OZD‑1 / RDMO) Overlay standards may reduce setbacks or add use rules that affect whether a building is nonconforming or eligible for reconstruction under reduced setbacks. Check lot listing in § 17.17.020 for OZD‑1 and RDMO applicability; confirm if overlay provisions supersede RA‑S rules for your lot.
ADU legalization vs nonconforming conditions State ADU law and local ADU chapter affect whether nonconforming zoning conditions can block ADU permits; Rolling Hills implements these in Chapter 17.28 but state law can constrain denial. See § 17.28.080 and consult planning staff; where state law applies, City cannot deny ADU solely to force conformance unless there's a health/safety threat.
Revocation risk Nonconforming status can be revoked through an administrative hearing for fraud, violations, nuisance, etc. (Chapter 17.58). If operating under approvals, keep conditions and permits current; verify if record shows violations.

Plain‑English summary

If your house, barn or use was legal when established but no longer meets today's zoning, it may continue as a legal nonconformity — but you generally cannot expand it, you must keep it maintained, and if the use stops or a structure is heavily destroyed you lose those rights. Rolling Hills codifies these limits in Chapter 17.24 (definitions, continuance, reconstruction, maintenance and revocation rules) and overlays or special district rules (OZD‑1, RDMO) may change setback or use outcomes for specific lots — always confirm with Planning.

Source References

  • Rolling Hills Zoning Ordinance (Title 17) — Definitions: § 17.12.140 (nonconforming land/structure/use)
  • Chapter 17.24 — Nonconforming Uses and Structures: § 17.24.010 (purpose), § 17.24.020 (continuance), § 17.24.030 (limits on nonconforming uses), § 17.24.040 (limits on structures), § 17.24.045 (reduced setback rules for certain RA‑S‑1 dwellings), § 17.24.050 (reconstruction), § 17.24.060 (maintenance), § 17.24.070–.080 (applicability & exemptions).
  • Chapter 17.16 — RA‑S development standards and permitted uses (summary table and setbacks) — key provisions § 17.16.010; development table summary.
  • Chapter 17.17 — Overlay Zoning District OZD‑1 (applicability and reduced setbacks) — § 17.17.020–.030.
  • Chapter 17.19 — Rancho Del Mar Housing Opportunity Overlay (RDMO) — § 17.19.010–.040 and parking Table 17.19.070A.
  • Chapter 17.28 — Accessory Dwelling Units (ADUs): nonconforming conditions and permit constraints § 17.28.080–.090.
  • Chapter 17.46 — Site plan review applicability (when discretionary review is required) § 17.46.020.
  • Chapter 17.58 — Revocations (process and grounds) § 17.58.010–.040.

Information gaps

  • Exact procedural forms, filing fees, and the City's internal review checklists for verifying nonconforming status are not contained in the retrieved Title 17 excerpts. Verify with the Planning Department for parcel‑specific records. Not found in retrieved materials.
  • Parcel‑level determination — whether a particular lot is within OZD‑1 or RDMO must be checked against the official zoning map; the code identifies which lots are in OZD‑1 but you should verify mapping in the City planning office.

Sources

Retrieved passages

  • Rolling Hills Zoning Code (§11) High relevance
  • Rolling Hills Zoning Code (Section 17.16.140) High relevance
  • Rolling Hills Zoning Code (§11) High relevance
  • CBC § 11 (§11) High relevance
  • Rolling Hills Zoning Code (Chapter 17.28) High relevance
  • Rolling Hills Zoning Code (§ 22) Medium relevance
  • Rolling Hills Zoning Code (Chapter 17.24.) Medium relevance
  • Rolling Hills Zoning Code (§7) Medium relevance
  • Rolling Hills Zoning Code (§ 22) Medium relevance
  • Rolling Hills Zoning Code (§11) Medium relevance
  • Rolling Hills Zoning Code (§ 22) Medium relevance
  • Rolling Hills Zoning Code (Chapter 17.46) Medium relevance
  • CBC § 17.27.040 (Section is) Medium relevance
  • Rolling Hills Zoning Code (Title 17) Medium relevance
  • CBC § 1 (§ 1) Medium relevance
  • Rolling Hills Zoning Code (Chapter 17.17) Medium relevance

Cited sections

Frequently asked questions

Can a nonconforming use be expanded in Rolling Hills?

No. Under Rolling Hills Title 17 a legal nonconforming use may not be expanded or extended into other portions of a building, and structural alterations that increase nonconformity are prohibited; see § 17.24.030(B) and § 17.24.040(A).

What happens if my nonconforming use stops operating?

If a nonconforming use is discontinued for any period, the legal nonconforming rights are lost and any future use must conform to current zoning (§ 17.24.030(C)). Keep documentation of continuous operation; otherwise rights can be extinguished.

If my home is damaged by fire, can I rebuild to the same footprint?

Yes — for nonconforming primary residential structures in the RA‑S zone there is an express reconstruction allowance to restore the structure to prior conditions and a limited addition (up to 999 sq ft) is allowed if reconstruction meets the criteria and construction begins within 2 years (§ 17.24.050(A)). For other nonconforming structures, reconstruction is allowed only if damage does not exceed 50% of assessed value (§ 17.24.050(B)).

Do ordinary repairs violate the nonconforming rules?

No. Ordinary maintenance and repair (painting, plumbing, routine repairs necessary for health/safety) are explicitly permitted and do not cause loss of nonconforming status (§ 17.24.060).

Are there special reduced setback rules for older homes?

Yes. Section 17.24.045 provides reduced setback limits for qualifying single‑family dwellings in the RA‑S‑1 district on lots of 1.25 acres or less that had legal nonconforming setbacks as of May 23, 2012; the provision sets alternative front, side and street side setback minima subject to listed conditions.

Can the City revoke my nonconforming status?

Yes. The Planning Commission (with City Council appeal) may revoke a legal nonconforming status for grounds including fraud, violations of conditions, or nuisance; the revocation process and findings are set out in Chapter 17.58 (§ 17.58.010–.040).

How do overlays like OZD‑1 and RDMO affect nonconforming rules?

Overlays can supersede or modify base zone standards (for example, OZD‑1 allows reduced setbacks for specific lots and alters how reconstruction may be measured). Overlays are identified in their respective chapters; check Chapter 17.17 for OZD‑1 and Chapter 17.19 for RDMO and then apply Chapter 17.24 for nonconforming treatment.

If I want to add an ADU, can the City deny it because of a nonconforming condition on the lot?

Rolling Hills’ ADU chapter recognizes that some nonconforming zoning conditions cannot be used to deny ADU permits where the condition does not threaten public health and safety or is not affected by ADU construction; see § 17.28.080. Consult planning staff because state ADU laws also influence what local agencies can require.

When is site plan review required for work on a nonconforming property?

Site plan review is required for many new construction and expansions (see § 17.46.020). However, reconstruction allowed by § 17.24.050(A–B) may be exempt from site plan review in certain circumstances (§ 17.24.050(C)). Confirm with the Planning Department whether your project triggers site plan review.

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