Willows — Nonconforming Uses

Last reviewed: July 6, 2026

Overview

Willows regulates how legally established but no-longer-conforming uses, buildings, and lots may continue, change, or rebuild under the Willows Municipal Code Title 18 Zoning. The city’s core rules appear in the General Provisions and Exceptions chapter and apply citywide, with a few district-specific carve-outs for older residential structures and sites in the central commercial, general commercial, and entryway districts. For context on the broader framework, see the city’s Willows Zoning and Willows Development Standards.

Key rule in plain English: If a nonconforming use stops for six months, Willows presumes it’s abandoned and it cannot restart as nonconforming; any new use must conform to current zoning (§ 18.110.090(1)(b)).

What “nonconforming” means in Willows

• The code defines a “nonconforming building or use” as one that was lawful when established but no longer conforms to current zoning provisions (§ 18.25.140 N definitions).
• Title 18’s nonconforming provisions apply across all zoning districts listed in § 18.10.010 (R‑1, R‑2, R‑3, R‑P, E, CC, CG, CH, ML, MH, OS, AG, PF). See the list of districts in § 18.10.010 and combining districts in § 18.10.020.

Citywide rules that govern Nonconforming Uses (apply in all districts)

• Continuation is allowed. Lawful uses existing when the zoning rules changed may continue. However, nonconforming commercial and industrial uses operated on open land (not accessory to a permanent building) may continue only up to five years from becoming nonconforming (§ 18.110.090(1)(a)).
• Abandonment triggers loss of rights. Discontinuance for six months is prima facie evidence of abandonment; any subsequent use must conform (§ 18.110.090(1)(b)).
• Lateral change of use is limited. A nonconforming use inside a building may be changed to another nonconforming use only if it is of the same or a more restricted classification, and only if no structural alterations are made (§ 18.110.090(2)).
• Alterations and maintenance are capped. A building devoted to a use not permitted in its district cannot be enlarged, extended, reconstructed, or structurally altered unless the use is changed to a permitted one. “Authorized maintenance” is allowed up to 50% of the building’s assessed value in any five-year period. Owners of nonconforming residential buildings may seek a conditional use permit (CUP) to exceed that maintenance cap (§ 18.110.090(3)).
• Destruction threshold matters. If a nonconforming building is destroyed more than 50% of its value, the site and building must thereafter comply with current zoning. “Value” is the estimated in-kind replacement cost determined by the Building Official (§ 18.110.090(4)).
• Special path for older residential structures in nonresidential zones. Nonconforming residential structures in office, commercial, or industrial zones may continue as residential without increasing unit count or floor area, and may be reconstructed even after >50% destruction if the owner secures a zoning clearance letter, obtains a building permit within six months, and the reconstruction meets current development standards (including parking, height, setbacks, etc.) (§ 18.110.090(4)).
• Applies to future rezonings too. These rules also apply when district boundaries change later; time limits run from the amendment that first created the nonconformity (§ 18.110.090(5)).
• Paperwork may be required. If notified by the Planning Commission, owners of nonconforming properties must apply for a Certificate of Use and Occupancy and renew it on a prescribed schedule; the Commission may waive these requirements case-by-case or categorically (§ 18.110.090(6)).

Residential exemptions by district (Willows-specific carve-outs)

• Residential use in existing buildings in CC and CG. Existing structures in the CC or CG districts—regardless of original construction as residential or not—may be used as residential units through a CUP. No enlargement/extension/reconstruction is allowed beyond what § 18.110.090(3) permits (§ 18.110.090(8)).
• Entryway District, existing residential structures. Existing structures built for single- or multi-family residential use before the current code and located in the Entryway (E) district may be used as residential units by CUP. Alterations must follow § 18.50.050 and § 18.110.090(3) (§ 18.110.090(9)).
• Entryway District, certain vacant parcels. A vacant parcel in the E district may be approved by CUP for a single-family home if: it does not abut Wood Street, it abuts another residential use, and it complies with § 18.50.050(1) (§ 18.110.090(10)).

Key decision rules (quick table)

Interactions with other Willows rules

• Reconstruction must meet current development standards such as parking, height, and setbacks when using the residential reconstruction path in nonresidential zones (§ 18.110.090(4)).
• Exterior work may require design review; most exterior additions/changes are subject to review (§ 18.141.030).
• Relief from strict standards may be possible through a variance if the findings in § 18.140.050 are met.
• Planned Development overlay remains subject to base-district rules; PD combines with underlying zoning, per § 18.105.020 (see Willows Overlay Districts).
• Nonconforming storage containers follow their own amortization and compliance timeline in § 18.110.110. Owners must either remove, permit with variances, modify/relocate, or obtain amortization time; limited extensions up to three years may be granted, with a process to seek a short-term retention permit (§ 18.110.110(7)).
• Signs have separate nonconforming sign provisions; see Willows Signage and related standards (e.g., § 18.125.200 references Planning Commission review for sign programs).
• ADUs are governed by state law that limits denial due to existing nonconforming zoning conditions. See Willows ADUs and California ADU law for details summarized by HCD (e.g., agencies generally cannot require correction of nonconforming zoning conditions to approve ADUs unless there’s a health/safety issue).

District-by-District: where nonconforming issues most often arise

The city’s districts are established in § 18.10.010 (Title 18), with the following purposes and highlights. For districts without retrieved standards below, the general nonconforming rules above still apply (§ 18.110.090).

R-1 Single-Family Residential District

• Purpose, typical uses, and key dimensional standards: Not found in retrieved materials.
• Nonconforming takeaway: Baseline citywide rules apply (§ 18.110.090).

R-2 Two-Family Residential District

• Purpose: Medium-density mix of residential types (§ 18.35.010).
• Typical permitted uses: One- or two-family dwellings and related residential uses (§ 18.35.020).
• Key standards: Minimum lot sizes 6,000 sf (interior) / 7,500 sf (corner); front setback 25 ft; side 6 ft (street side 10 ft); rear 15 ft; max height two-and-a-half stories/30 ft (§ 18.35.040).
• Nonconforming takeaway: Standard rules; consider design review if exterior changes trigger review (§ 18.141.030).

R-3 High Density Residential District

• Purpose: Areas for high-density residential living (§ 18.40.010).
• Typical permitted uses: R‑2 uses plus multifamily, group dwellings, SROs (§ 18.40.020).
• Key standards: Not found in retrieved materials.
• Nonconforming takeaway: Standard rules; verify setbacks/height on rebuilds (“Verify with the jurisdiction”).

R-P Multiple Residence–Professional Office District

• Typical uses: Professional offices and related uses; references to R‑3 uses with CUP (§ 18.45.030), and dimensional standards in § 18.45.040 (e.g., 25‑ft front setback; 6‑ft side; 15‑ft rear; 30‑ft main building height by right, 50‑ft with CUP).
• Nonconforming takeaway: Older residential buildings in an “office” zone may qualify for the residential reconstruction/continuation path in § 18.110.090(4) if criteria are met.

E Entryway District

• Purpose/standards: Chapter heading present; detailed standards not in retrieved excerpts (Chapter 18.50).
• Nonconforming takeaway: CUP pathways exist for existing residential structures and for some vacant parcels to become single-family residential, per § 18.110.090(9)–(10) with cross-reference to § 18.50.050.

CC Central Commercial District

• Purpose: Core downtown retail and services; new residential permitted subject to chapter regulations (§ 18.55.010).
• Typical permitted uses: Retail, food service, offices, etc.; residential allowed above the first story except as authorized by § 18.110.090(8) (§ 18.55.020).
• Key standards: No minimum yards; max building height 50 ft (§ 18.55.050).
• Nonconforming takeaway: Existing buildings may be approved for residential use via CUP under § 18.110.090(8), even on the first story.

CG General Commercial District

• Purpose: Community-serving commercial areas (§ 18.60.010).
• Typical permitted uses: CC uses plus auto services, schools, commercial parking, emergency shelters ≤50 beds; residential above first story except as authorized by § 18.110.090(8) (§ 18.60.020).
• Key standards: “Other regulations” include minimum lot area 5,000 sf; additional yard/height details not fully retrieved (§ 18.60.040).
• Nonconforming takeaway: Existing structures can be approved for residential use via CUP under § 18.110.090(8).

CH Highway Commercial District

• Purpose/uses/standards: Not found in retrieved materials.
• Nonconforming takeaway: Baseline rules apply (§ 18.110.090).

ML Light Industrial District

• Purpose/uses/standards: Not found in retrieved materials.
• Nonconforming takeaway: Note 5‑year cap can apply to open‑land industrial uses without permanent buildings (§ 18.110.090(1)(a)).

MH Heavy Industrial District

• Purpose/uses/standards: Not found in retrieved materials.
• Nonconforming takeaway: Same as ML, and consider the abandonment rule closely (§ 18.110.090(1)(b)).

OS Open Space District

• Purpose/uses/standards: Not found in retrieved materials.
• Nonconforming takeaway: Baseline rules apply (§ 18.110.090).

AG Agriculture General District

• Purpose/uses/standards: Not found in retrieved materials.
• Nonconforming takeaway: Baseline rules apply (§ 18.110.090).

PF Public Facilities District

• Purpose/uses/standards: Not found in retrieved materials.
• Nonconforming takeaway: Baseline rules apply (§ 18.110.090).

Checklist

• Confirm the use/building was lawful when established (definition in § 18.25.140).
• Determine if the use is on open land without a permanent building; if so, note the 5‑year continuation limit for commercial/industrial uses (§ 18.110.090(1)(a)).
• Verify no six‑month discontinuance has occurred (abandonment presumption) (§ 18.110.090(1)(b)).
• If changing to another nonconforming use, confirm it’s the same or a more restricted classification and that no structural alterations are proposed (§ 18.110.090(2)).
• Tally maintenance costs over the last five years against the 50% cap; if residential, consider a CUP to exceed (§ 18.110.090(3)).
• If destroyed >50%, plan to fully conform—or, for residential in office/commercial/industrial zones, pursue the zoning clearance letter path (permit within six months; rebuild to current development standards) (§ 18.110.090(4)).
• If directed by the city, apply for/renew a Certificate of Use and Occupancy for the nonconforming property (§ 18.110.090(6)).
• If in CC/CG or Entryway, evaluate residential CUP options (§ 18.110.090(8)–(10)).
• Check whether exterior work triggers design review (§ 18.141.030).
• If strict application causes hardship, consider a variance (§ 18.140.050).

Risks & Ambiguities

Plain-English Summary

Willows generally lets you keep using a property the way it was legally used when the rules changed—but with strings attached. If you stop using it for six months, or if it’s mostly destroyed, you’ll likely have to meet today’s zoning. There are helpful exceptions for older residential buildings in commercial/office/industrial zones and in the CC/CG and Entryway districts, but most expansions or rebuilds must meet current standards.

Information Gaps

• Detailed standards for R‑1, R‑3 (other regulations), CH, ML, MH, OS, AG, and PF districts: Not found in retrieved materials.
• Full text of Entryway District standards, including § 18.50.050: Not found in retrieved materials.
• Explicit classification system for “same or more restricted” nonconforming use changes: Not found in retrieved materials.

Source References

• WMC § 18.25.140 (N definitions) — Nonconforming building or use.
• WMC § 18.10.010–.020 — Districts and combining districts.
• WMC § 18.110.090 — Nonconforming uses (continuation, abandonment, change, alterations, destruction, applicability, certificate; CC/CG and Entryway residential exemptions).
• WMC § 18.110.110 — Storage containers; nonconforming container amortization/retention.
• WMC § 18.35.010–.040 — R‑2 (purpose, uses, standards).
• WMC § 18.40.010–.020 — R‑3 (purpose, uses).
• WMC § 18.45.040 — R‑P (other regulations; dimensional standards).
• WMC § 18.55.010–.050 — CC (purpose, uses, standards).
• WMC § 18.60.010–.040 — CG (purpose, uses, other regulations).
• WMC § 18.141.030 — Design Review applicability.
• WMC § 18.140.050 — Variance findings.
• California ADU guidance on nonconforming conditions (HCD 2025 ADU Handbook summary).

Retrieved passages

• Willows Zoning Code (section and) High relevance show source text
• Willows Zoning Code (title shall) High relevance show source text
• Willows Zoning Code (Chapter to) High relevance show source text
• Willows Zoning Code (title for) High relevance show source text
• Willows Zoning Code (§ 1) High relevance show source text
• Willows Zoning Code (section may) Medium relevance show source text
• CFC § 141 (Chapter 18.141) Medium relevance show source text
• Willows Zoning Code (§ 1) Medium relevance show source text
• Willows Zoning Code (§ 66314) Medium relevance show source text
• Willows Zoning Code (§ 66333) Medium relevance show source text
• Willows Zoning Code (§ 24.05) Medium relevance show source text
• Willows Zoning Code (§ 1) Medium relevance show source text
• Willows Zoning Code Medium relevance show source text

Cited sections

• WMC § 18.25.140 (N definitions) — Nonconforming building or use. (§ 18.25.140)
• WMC § 18.10.010–.020 — Districts and combining districts. (§ 18.10.010)
• WMC § 18.110.090 — Nonconforming uses (continuation, abandonment, change, alterations, destruction, applicability, certificate; CC/CG and Entryway residential exemptions). (§ 18.110.090)
• WMC § 18.110.110 — Storage containers; nonconforming container amortization/retention. (§ 18.110.110)
• WMC § 18.35.010–.040 — R‑2 (purpose, uses, standards). (§ 18.35.010)
• WMC § 18.40.010–.020 — R‑3 (purpose, uses). (§ 18.40.010)
• WMC § 18.45.040 — R‑P (other regulations; dimensional standards). (§ 18.45.040)
• WMC § 18.55.010–.050 — CC (purpose, uses, standards). (§ 18.55.010)
• WMC § 18.60.010–.040 — CG (purpose, uses, other regulations). (§ 18.60.010)
• WMC § 18.141.030 — Design Review applicability. (§ 18.141.030)
• WMC § 18.140.050 — Variance findings. (§ 18.140.050)
• California ADU guidance on nonconforming conditions (HCD 2025 ADU Handbook summary).
• Willows_ZoningCode.md
• 2025 California ADU handbook.md