Calabasas — Nonconforming Uses

Last reviewed: July 1, 2026

Overview

This page summarizes how the City of Calabasas regulates nonconforming uses, nonconforming structures, and nonconforming lots under the Calabasas Development Code (Title 17). It explains what may continue, what triggers loss of nonconforming status, and the most common limits on alterations, reconstruction, and transfers — all anchored to the local code. For related review topics see how this interacts with parking (/us/california/calabasas/parking), the city's development standards, and design review (/us/california/calabasas/design-review).

Chapter and section callouts below are taken from Title 17 (Development Code); cite markers point to the source excerpts used.

The local controlling ordinance (short)

• The Calabasas Development Code treats nonconforming items in Chapter 17.72 — Nonconforming Structures, Uses and Lots. Key operative §§ are § 17.72.010, § 17.72.020, § 17.72.030, § 17.72.040, § 17.72.050, and § 17.72.060.

How the code works — top rules (plain reference + short interpretation)

• A use lawfully established before a zoning change that is now prohibited is a nonconforming use and may continue but may not be expanded or intensified without complying with the code. (See § 17.72.020(A)).
• A nonconforming structure can be maintained and in many cases altered, but alterations cannot increase the degree of nonconformance; special rules apply for setback encroachments and for large-scale demolition/repair (the “50% rule”). (See § 17.72.020(B)).
• If a nonconforming use is discontinued for a continuous period of one year, the code presumes abandonment and the use loses its nonconforming status. (See § 17.72.030).
• Nonconforming lots of record can be treated as legal building sites when they meet specified criteria (approved subdivision, recorded deed prior to the amendment, variance/lot-line adjustment, or limited government acquisition). (See § 17.72.050).

District-by-district breakdown

Below are the Calabasas zoning districts and overlays that commonly interact with nonconforming rules. For each I name the district as used in the Code, state its purpose, typical permitted uses, representative dimensional standards, where it applies, and the nonconforming implications drawn from Title 17.

Note: for district-specific allowed uses and complete dimensional tables consult the district chapters and the City's zoning map; the Development Code references those district chapters (Article II and Article III).

Residential districts — RS family (e.g., RS-8, RS-9.5) and RR (rural)

• Purpose: single-family and low-density residential neighborhoods. Typical permitted uses include single-family homes and accessory uses allowed by Section 17.11.010 for the residential districts.
• Key dimensional standards (representative): minimum front and side setbacks, maximum height limits, and lot-area suffixes (e.g., “-8” indicates RS-8, 8,000 sq ft minimum where the suffix applies). See Article III/Chapter 17.20 for measurement rules.
• Where it applies: city single-family neighborhoods (see zoning map and Chapter 17.13/17.12 for density and accessory rules).
• Nonconforming implications: Additions to a nonconforming single-family structure are allowed if the addition does not further increase the nonconformance; large renovations that demolish or remove ≥50% of exterior walls or square footage within two years must conform to current standards (the 50% rule). (See § 17.72.020(B)(1)(e) and § 17.72.020(B)(2)).

Commercial Mixed Use (CMU) zone

• Purpose: allow mixed residential/commercial development and higher density where appropriate. See Chapter 17.14 for full CMU standards.
• Typical permitted uses: mixed-use buildings, retail, office, and residential units where allowed by the CMU chapter and Section 17.11.010.
• Key dimensions: CMU-specific standards are in Chapter 17.14 (refer to that chapter for FAR, heights and setbacks).
• Nonconforming implications: Nonconforming uses in CMU follow Chapter 17.72 rules — cannot be expanded/intensified without compliance; a nonconforming use occupying only a portion of a building may be extended through the building only with a conditional use permit. (See § 17.72.020(C)(1)-(2)).

CO (Commercial Office) zone

• Purpose: office and professional uses with limited commercial support. Typical accessory uses are allowed per Section 17.11.010 and district text; some specific accessory lab/R&D rules are provided in the code for the CO zone.
• Nonconforming implications: same Chapter 17.72 limits on expansion and transfer of nonconforming uses; a conforming use may replace a nonconforming structure when new use permits are satisfied. (See § 17.72.020(D)).

Overlay districts that materially affect nonconforming treatment

• Calabasas Highlands (-CH) overlay — Purpose and special dimensional rules (reduced maximum floor area, explicit setbacks, and unique height measurement rules) apply in addition to base zoning; nonconforming structure rules still apply but rebuilding/major alterations must meet overlay and hillside standards when the 50% rule triggers compliance. See the Calabasas Highlands standards table in the Code. (See § 17.18.030 and Calabasas Highlands standards).
• Development Plan (-DP) overlay — used where site-specific flexibility is needed; when a DP is applied it can modify minimum lot area, setbacks, site coverage, FAR, height and parking; nonconforming determinations must consider DP conditions. (See § 17.18.030(E)).
• Commercial Auto Retailer (CAR) overlay — creates use allowances within commercial districts for auto retail uses (noted in the use tables); where an overlay authorizes a use now allowed in the base zoning, the nonconforming rules remain the baseline for other nonconforming features. (See use-notes referencing § 17.18.035 in the use tables).

Quick decision table (most-used rules for applicants)

Checklist — what an applicant must prepare when dealing with a nonconformity

• Document the lawful, prior use or lawful recorded construction date (deeds, permits, site plans, business licenses). (Needed to prove nonconforming status.) Verify with the jurisdiction.
• Confirm whether the proposed work would expand or intensify the existing nonconforming use; if yes, plan to bring the site into compliance or apply for required permits (CUP, site plan). (See § 17.72.020(A)).
• For structural work, calculate percent of exterior wall/area to be removed within a two‑year window; if ≥50%, propose designs that meet current district standards. (See § 17.72.020(B)(1)(e)).
• If rebuilding after damage, prepare a site plan permit application within 12 months and schedule reconstruction to start within 24 months, and ensure floor area does not exceed the original. (See § 17.72.020(E)).
• Check overlay district rules (e.g., -CH, -DP, CAR) that may impose additional standards; coordinate with the city's Development Review/Design Review process. (See § 17.18.030 and Calabasas Highlands standards).
• If relying on a nonconforming lot of record, gather subdivision/deed/lot-line/variance records to meet one of § 17.72.050's criteria. (See § 17.72.050).

(Also consult the city's pages on zoning, overlay districts and variances and exceptions early in the process.)

Risks & Ambiguities

Plain-English summary

If your building or use in Calabasas was legal before a zoning change, you can usually keep it, but you cannot expand or intensify it without following today's rules; major repairs or big rebuilds often require you to update the building to current development standards, and stopping the use for a year generally ends the nonconforming protection. (See §§ 17.72.020, 17.72.030, 17.72.050).

Source References

• Calabasas Development Code, Title 17 — Chapter 17.72: Nonconforming Structures, Uses and Lots (see § 17.72.010, § 17.72.020, § 17.72.030, § 17.72.040, § 17.72.050, § 17.72.060)
• Calabasas Development Code excerpts showing the 50% demolition/alteration rule and repair/rebuild rules — § 17.72.020(B)(1)(e) and related subsections.
• Rules for reconstruction after damage (application and timing limits) — § 17.72.020(E).
• Nonconforming lots criteria and legal-lot tests — § 17.72.050.
• Calabasas overlay and district authority (examples: -DP and Calabasas Highlands -CH standards referenced in Article II / § 17.18.030 and Calabasas Highlands table) — overlays and development plan provisions.
• Development Code organization and definition references (Article VI and Article VII explain code structure and definitions such as “nonconforming lot/structure/use”).

Retrieved passages

• Calabasas Zoning Code (Chapter 17.72) High relevance show source text
• Calabasas Zoning Code (§ 3) High relevance show source text
• Calabasas Zoning Code (chapter may) High relevance show source text
• Calabasas Zoning Code (§ 3) High relevance show source text
• Calabasas Zoning Code (Section 17.18.035.) High relevance show source text
• Calabasas Zoning Code (Section 17.62.080) Medium relevance show source text
• CBC § 66321 (§ 66321) Medium relevance show source text
• Calabasas Zoning Code (Section 17.18.035.) Medium relevance show source text
• Calabasas Zoning Code (chapter may) High relevance show source text
• Calabasas Zoning Code (Chapter 17.36) High relevance show source text
• CEC § 3 (Title 15) High relevance show source text
• CBC § 66314 (§ 66314) Medium relevance show source text

Cited sections

• Calabasas Development Code, Title 17 — **Chapter 17.72: Nonconforming Structures, Uses and Lots** (see **§ 17.72.010**, **§ 17.72.020**, **§ 17.72.030**, **§ 17.72.040**, **§ 17.72.050**, **§ 17.72.060**) (Title 17)
• Calabasas Development Code excerpts showing the **50% demolition/alteration** rule and repair/rebuild rules — § 17.72.020(B)(1)(e) and related subsections. (§ 17.72.020)
• Rules for **reconstruction after damage** (application and timing limits) — § 17.72.020(E). (§ 17.72.020)
• **Nonconforming lots** criteria and legal-lot tests — § 17.72.050. (§ 17.72.050.)
• Calabasas overlay and district authority (examples: **-DP** and **Calabasas Highlands -CH** standards referenced in Article II / § 17.18.030 and Calabasas Highlands table) — overlays and development plan provisions. (Article II)
• Development Code organization and definition references (Article VI and Article VII explain code structure and definitions such as “nonconforming lot/structure/use”). (Article VI)
• Calabasas_ZoningCode.md
• 2025 California ADU handbook.md

• Official Calabasas code library