Cupertino — Nonconforming Uses

Last reviewed: July 2, 2026

Overview

This page explains how Cupertino's Zoning Ordinance (Title 19) treats nonconforming uses, noncomplying facilities (structures), and related lot conditions. The controlling rules sit in Chapter 19.140 and interact with district chapters for single-family, hillside, multifamily, planned development, open-space and commercial zones. Read the bolded section citations and verify parcel-specific facts with the City when in doubt. See the City's zoning menu for related topics like development standards, parking, design review, overlays and ADUs: Cupertino Zoning.

Core rules (Cupertino Title 19 — chapter summary)

• A nonconforming use that lawfully existed when zoning changed may generally continue indefinitely, but if it is discontinued or abandoned for six months, it loses its nonconforming status and must thereafter conform (§ 19.140.010) .
• No expansion: a nonconforming use may not be expanded so that it increases site area, gross floor area, number of structures, or the size/height of structures occupied by the use (§ 19.140.020) .
• Change of use: a nonconforming use may only be changed to a conforming use, except in limited cases where the Director allows a change to another nonconforming use that would have been permitted under the prior zoning; such changes cannot increase floor area or create new adverse impacts (§ 19.140.030) .
• Maintenance and minor alterations are allowed; alterations whose value in any one year exceed ten percent of the structure’s current value are limited — larger alterations must either accommodate a conforming use or be required by law (§ 19.140.040) .
• Reconstruction/Replacement after damage: nonconforming facilities damaged by causes other than intentional acts may be reconstructed to continue the nonconforming use provided size, site area, height and intensity do not exceed the pre-damage condition; special replacement rules apply for residential or agricultural zones (§ 19.140.050, § 19.140.080) .
• Noncomplying facilities (zoning nonconformance like setbacks, coverage) may not be enlarged if the enlargement increases noncompliance; routine maintenance that does not increase noncompliance is allowed (§ 19.140.060 and § 19.140.070) .
• The City keeps a record of known nonconforming uses / buildings (except properties in multifamily districts) and the Director or Planning Commission may hold proceedings to declare a use unlawful for specific grounds (§ 19.140.100, § 19.140.110, § 19.140.120) .

For developer/permit interactions, check the City's Development Standards and consult Cupertino Design Review where applicable; parking questions are handled under the Cupertino Parking chapter and ADU interactions are in the ADU chapter and state ADU law — see Cupertino ADUs and California Building Standards Code.

District-by-district notes (how nonconforming rules interact with specific Cupertino districts)

Note: the nonconforming rules in Chapter 19.140 apply citywide; the summaries below list each district’s purpose and where to look for the district standards that determine whether a use or facility is nonconforming.

R-1 (Single-Family Residence)

• Purpose: The R-1 district aims to create and preserve detached-dwelling neighborhoods with low intensity, adequate light/air/privacy and compatible scale (§ 19.28.010) .
• Typical permitted uses: single-family homes and customary accessory uses as listed in the use tables referenced by the chapter (§ 19.28.030 and cross-reference § 19.20.020) .
• Key dimensional standards: See the R-1 chapter for required permits and front/rear/side setback rules; small one-story encroachments and certain one-story extensions of an existing nonconforming building wall line are subject to a Minor Residential Permit process (Table 19.28.040 and related sections) (§ 19.28.040, see related permit rules) .
• Where it applies: city single-family neighborhoods shown on the zoning map; reasonable-accommodation rules are in the same chapter (§ 19.28.020) .
• Interaction with nonconforming rules: a nonconforming single-family structure or use in R-1 may be replaced after damage under limited rules, and maintenance/ten-percent alteration rules apply (§ 19.140.040, § 19.140.080) . For ADU questions on R-1 lots see Cupertino ADUs and the ADU chapter; the local ADU chapter specifically limits when nonconforming zoning conditions may be used to deny an ADU permit (§ 19.112.050) .

RHS (Residential Hillside)

• Purpose: The RHS district is intended to preserve hillside character and natural resources while accommodating compatible residential uses (§ 19.40.010) .
• Typical permitted uses: residential uses listed in the zone use table (see § 19.40.030 and § 19.20.020) .
• Key dimensional / development standards: RHS requires topographic plans, slope mapping and follows the Table 19.40.050 site development regulations (special setback/stepback and Hillside Exception processes) (§ 19.40.040, § 19.40.050) .
• Where it applies: hillside parcels mapped as RHS; Hillside Exception process may be used to deviate from some requirements (check the chapter).
• Interaction with nonconforming rules: RHS noncomplying facilities that are damaged may be reconstructed only under the same citywide nonconforming reconstruction rules; because RHS has extra approval requirements, verify reconstruction with the Director and see the Hillside Exception language (§ 19.140.050, § 19.40.050) .

R1-a / R1-e (Single-family variants: semi-rural and Eichler)

• Purpose & standards: these are special single-family subtypes (for example R1-a semi-rural and R1-e Eichler design areas) that modify permitted design/permit thresholds within the single-family chapter and the ADU chapter calls out design expectations for R1-e and R1-a neighborhoods (§ 19.28; ADU references) .
• Interaction with nonconforming rules: special design review or Minor Residential Permit rules can affect whether a proposed alteration is permitted when the structure is nonconforming; see the R-1 chapter for specific permit triggers (§ 19.28.040) .

Multi-family (chapter 19.38 / multiple-family standards)

• Purpose: encourage multi-family housing in appropriate locations while protecting neighborhood relationships.
• Key dimensional standards (example excerpt — check full chapter for full table): maximum lot coverage 55%, maximum height up to 70 feet, and detailed front/side/rear setback and stepback rules in Table 19.38.070; parking rules cross-reference Chapter 19.124 (see Cupertino Parking) (§ 19.38.070) .
• Interaction: The Director does not keep a citywide list of nonconforming uses in multifamily districts per § 19.140.100 (exception noted) — verify multifamily records with Planning staff (§ 19.140.100) .

P (Planned Development)

• Purpose: P zones are project-specific; each development permit and definitive plan establishes allowed uses and physical standards for that site (§ 19.80.050) .
• Interaction: Nonconforming uses created under a development agreement or a previously issued permit are still subject to Chapter 19.140; a termination of a development agreement does not automatically erase rights from a valid building permit already issued — such uses remain subject to nonconforming provisions (§ 19.144.210) .

OS / PR / FP (Open Space / Park & Recreation / Private Recreation)

• Purpose/uses: these districts explicitly allow certain low-intensity recreation and maintenance uses and explicitly allow lawful nonconforming uses subject to Chapter 19.140 (§ 19.84.020) .

Commercial Neighborhood (C‑N) and other commercial zones

• Purpose & uses: C‑N and other commercial chapters list permitted, conditional and excluded uses in Section 19.20.020 and the district chapter (e.g., 19.76, 19.72, 19.44 etc.). Nonconforming commercial uses are controlled by Chapter 19.140; special rules exist for signs where nonconforming signs must be brought into conformance after certain changes (§ 19.104.310 - 19.104.330) .

Quick reference table — most decision-relevant nonconforming standards

Checklist — What an applicant must show or satisfy for a nonconforming-use question

• Demonstrate the use was lawfully established on the date the zoning changed (provide historical permits, business licenses, dated photos or leases) — see § 19.08.030 definition of nonconforming use (definitions chapter) and § 19.140.010 for continuation rules .
• Confirm the use has not been discontinued/abandoned for six months (evidence of continuous operation) — § 19.140.010 .
• If proposing alterations, supply a current cost appraisal (to apply the 10% alteration rule) and have the Chief Building Official review value calculations per § 19.140.090 and § 19.140.040 .
• If the facility was damaged, document pre-damage size/intensity for reconstruction limits under § 19.140.050; for residential zones check the residential replacement exception § 19.140.080 .
• If the proposal involves changes that might increase parking, traffic, noise or privacy impacts, prepare impact analysis — changes to another nonconforming use are limited if they “create, cause, or significantly increase” such impacts (§ 19.140.030) .
• Coordinate with design review and development standards processes where district rules trigger permits — see Cupertino Design Review and Cupertino Development Standards.

Risks & Ambiguities

Plain-English Summary

If your business or building in Cupertino became “nonconforming” when the zoning changed, you can usually keep operating — but you cannot expand the nonconforming activity, you must not abandon it for six months or it will lose protection, and only limited maintenance and repairs are allowed unless larger changes either accommodate a conforming use or are required by law; see the citywide rules in § 19.140.010–.120 for the details and talk to Planning to confirm how they apply to your parcel .

Source References

• Cupertino Municipal Code — Title 19: CHAPTER 19.140, Nonconforming Uses and Nonconforming Facilities (general application, expansion, change, maintenance, replacement, enlargement, value, recordkeeping, proceedings and appeals): § 19.140.010 – § 19.140.120 .
• R-1 Single‑Family Residence district (purpose, applicability, permits): § 19.28.010 – § 19.28.040 .
• RHS Residential Hillside district (purpose, applicability, site regulations): § 19.40.010 – § 19.40.050 .
• Multi‑family building development regulations (Table 19.38.070 example standards): § 19.38.070 .
• Open Space / Park & Recreation (explicit allowance of legal nonconforming uses per chapter): § 19.84.020 .
• ADU chapter (nonconforming zoning condition treatment when approving ADUs): § 19.112.050 – § 19.112.060 and ADU design requirements (cross-references) .
• Signage: nonconforming signs rules, abandonment and enforcement: § 19.104.310 – § 19.104.340 .
• For state-level ADU guidance (context only; local ordinance controls here): 2025 California ADU handbook (state ADU law summary) .

Retrieved passages

• Cupertino Zoning Code (§ 2) High relevance show source text
• Cupertino Zoning Code (§ 2) High relevance show source text
• Cupertino Zoning Code (Chapter 19.12.) High relevance show source text
• Cupertino Zoning Code (§ 2) High relevance show source text
• Cupertino Zoning Code (§ 2) High relevance show source text
• Cupertino Zoning Code (§ 2) High relevance show source text
• Cupertino Zoning Code (§ 2) High relevance show source text
• Cupertino Zoning Code (§ 10) Medium relevance show source text
• Cupertino Zoning Code (Section 50105) High relevance show source text
• Cupertino Zoning Code (Section 19.20.020.) Medium relevance show source text
• Cupertino Zoning Code (Section 65868.) Medium relevance show source text

Cited sections

• Cupertino Municipal Code — Title 19: CHAPTER 19.140, Nonconforming Uses and Nonconforming Facilities (general application, expansion, change, maintenance, replacement, enlargement, value, recordkeeping, proceedings and appeals): **§ 19.140.010 – § 19.140.120** . (Title 19)
• R-1 Single‑Family Residence district (purpose, applicability, permits): **§ 19.28.010 – § 19.28.040** . (§ 19.28.010)
• RHS Residential Hillside district (purpose, applicability, site regulations): **§ 19.40.010 – § 19.40.050** . (§ 19.40.010)
• Multi‑family building development regulations (Table 19.38.070 example standards): **§ 19.38.070** . (§ 19.38.070)
• Open Space / Park & Recreation (explicit allowance of legal nonconforming uses per chapter): **§ 19.84.020** . (§ 19.84.020)
• ADU chapter (nonconforming zoning condition treatment when approving ADUs): **§ 19.112.050 – § 19.112.060** and ADU design requirements (cross-references) . (§ 19.112.050)
• Signage: nonconforming signs rules, abandonment and enforcement: **§ 19.104.310 – § 19.104.340** . (§ 19.104.310)
• For state-level ADU guidance (context only; local ordinance controls here): 2025 California ADU handbook (state ADU law summary) .
• Cupertino_ZoningCode.md
• 2025 California Residential Code.md
• 2025 California ADU handbook.md

• Official Cupertino code library