Local zoning · Yolo County

Yolo County — Nonconforming Uses

Nonconforming Uses under the Yolo County local zoning and planning code, with the controlling citations.

Last reviewed: July 6, 2026

Overview

In unincorporated areas of Yolo County, “nonconforming” status governs how legally established uses, buildings, and lots that no longer meet current zoning rules may continue, change, or phase out. The controlling standards live in the Yolo County Code, Title 8 (County Zoning Regulations), Chapter 2, specifically the nonconforming provisions of § 8-2.1007, which apply countywide across all base zones and overlays in unincorporated territory . This page distills those rules in plain English and connects them to Yolo’s base districts, zoning, and development standards.

Key rule: A legally established nonconforming use or structure may continue, but it generally cannot be enlarged, expanded, or intensified unless authorized; lapses in use can trigger loss of nonconforming status under the timelines in § 8-2.1007 .

What “nonconforming” means in Yolo County

Definitions. A nonconforming building is a structure that lawfully existed before November 18, 1963 (or a later amendment) but no longer meets the current height/area rules or cannot reasonably be used for a permitted use in its zone. A nonconforming use is a use that lawfully occupied land or a building before that date (or a later amendment) but no longer matches the use rules of its zone. Both definitions are set out in § 8-2.1007(b) .
Baseline continuation. Except as otherwise provided, any legally nonconforming land use or structure may continue, but no enlargement, expansion, or intensification is allowed unless authorized under § 8-2.1007. See § 8-2.1007(c) .

What you can do with a nonconforming use/structure

Keep operating. Lawfully established nonconforming uses and buildings may continue to operate in place, subject to the limits below (§ 8-2.1007(c)) .
Maintain/repair for safety. Strengthening or restoring any part of a building declared unsafe or unsanitary by County authorities is allowed (§ 8-2.1007(e)) .
Rebuild after calamity. A damaged or destroyed nonconforming building may be restored or reconstructed, but: (1) the work must meet then-current building, FEMA, and local flood requirements; and (2) you cannot change to a different nonconforming use as part of the rebuild (§ 8-2.1007(f)) . See also the California Building Standards Code.
Single-family homes on substandard lots. Reconstruction or enlargement of a single-family dwelling on a lot smaller or narrower than today’s minimums is allowed if the home meets all other regulations of its zone (§ 8-2.1007(g)) .

What requires discretionary relief

Extension within a building. The Planning Commission may, by Use Permit, allow a nonconforming use to extend throughout parts of a building that were manifestly designed for that use before it became nonconforming, if no structural alterations (except those required by law) are made (§ 8-2.1007(h)) .
Substitution of nonconforming uses. The Planning Commission may, by Use Permit, allow one nonconforming use to be substituted for another of the same or more restrictive nature; once changed to a more restrictive or conforming use, you cannot revert to a less restrictive or nonconforming use (§ 8-2.1007(i)) .
Intensifying, expanding, or enlarging. Any enlargement, expansion, or intensification of a nonconforming use/building is prohibited unless specifically authorized under § 8-2.1007; some cases are processed via Use Permit per subsections (h)–(i) (§ 8-2.1007(c), (h), (i)) .

When nonconforming status is lost (cessation timelines)

General cessation. A use is deemed to have ceased after a continuous 12-month discontinuance, even if temporary and regardless of intent; after that, the nonconforming use cannot resume (§ 8-2.1007(j)) .
Buildings designed for nonconforming uses. If a building designed for a use that is not permitted has been occupied by that nonconforming use and the use ceases for 24 months or more, the building cannot be used again for a nonconforming purpose (§ 8-2.1007(k)) .
Buildings designed for conforming uses but occupied by a nonconforming use. If the nonconforming use ceases for 12 months or more, it cannot resume (§ 8-2.1007(l)) .
Nonconforming uses of land (little/no structures). If a nonconforming land use (with no structures or only minor structures under 300 sq ft, fences, or signs) ceases for 6 months or more, it cannot resume; nonconforming structures must be removed within 12 months after first becoming nonconforming (§ 8-2.1007(m)) .
Junkyards. Nonconforming junkyards must be enclosed by a building, solid fence (8–12 ft), or an equivalent hedgerow within 1 year after becoming nonconforming; other § 8-2.1007 provisions still apply (§ 8-2.1007(n)) .

Special edge cases relevant to nonconformities

Conditional uses “grandfathered.” Uses lawfully existing at the time of adoption/amendment remain nonconforming and cannot be enlarged/expanded/intensified unless a Use Permit is obtained (§ 8-2.1007(d)) .
Public right-of-way dedications that create substandard yards. If a required road dedication makes a yard/setback substandard, later additions to the existing main building don’t need a variance if they meet all other zoning and don’t further reduce the nonconforming yard or setback (dedication rules outside Article 10) .
ADUs and nonconforming conditions (state overlay). Under state law, a permitting agency generally may not deny an ADU due to nonconforming zoning conditions unless there’s a related health/safety impact; see the state guidance summarized in the 2025 HCD ADU Handbook (Gov. Code §§ 66322–66323) and our page on California ADU law .

How this interacts with other Yolo County processes

Some changes to nonconforming uses require a Use Permit; related site/architectural issues may also trigger design review where applicable. Parking changes must follow parking standards for the zone. Signs remain subject to the County’s sign regulations regardless of nonconforming status; see § 8-2.1206–1208 and our page on signage .
Properties in overlay districts (e.g., SG-O, SGR-O, A-O) may have additional restrictions. Nonconformities do not “override” overlay rules; see the overlay districts overview and the overlay use tables (§ 8-2.905-2) . Projects near levees and floodplains must also meet the flood-related findings in § 8-2.306(ae) (noted within Article 10) .

District-by-district context: Where nonconforming rules apply

The County’s nonconforming standards apply in every base zone in unincorporated areas. Below are snapshots of typical uses and selected standards by district family, to ground expectations when evaluating a proposed change to a nonconforming situation. Always confirm the current zone of your parcel on the zoning map and see zone-specific standards in development standards.

A-N

Purpose: Not found in retrieved materials.
Typical permitted uses: Agricultural production and many farm support uses per agricultural tables (Table 8-2.304(a)–(e)) .
Examples: Primary farm dwelling allowed; ancillary dwelling allowed; various animal facilities by right or permit (Table 8-2.304(d)/(e)) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated agricultural areas; verify with the jurisdiction.

A-X

Purpose: Not found in retrieved materials.
Typical permitted uses: Similar agricultural production and animal facilities framework as A-N (see Table 8-2.304) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated agricultural areas; verify with the jurisdiction.

A-C

Purpose: Not found in retrieved materials.
Typical permitted uses: Selected agricultural support and resource extraction/utility uses by permit (Table 8-2.304(c)) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated areas; verify with the jurisdiction.

A-I

Purpose: Not found in retrieved materials.
Typical permitted uses: Broader agricultural industrial and select utility uses with Site Plan Review/Use Permits (Table 8-2.304(c)) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated areas; verify with the jurisdiction.

A-R

Purpose: Not found in retrieved materials.
Typical permitted uses: Limited agricultural/residential mix; consult animal-keeping notes specific to A‑R (Table 8-2.304(b)/(d)) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated areas; verify with the jurisdiction.

RR-5 and RR-2

Purpose: Not found in retrieved materials.
Typical permitted uses: Rural residential; accessory structures and home occupations governed by Article 10 (see § 8‑2.506 references in use tables) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated rural residential areas; verify with the jurisdiction.

R-L, R-M, R-H

Purpose: Not found in retrieved materials.
Typical permitted uses: Single-family and multifamily housing ranges; small/large multifamily allowed with Site Plan Review subject to standards (Article 10 references; multifamily in R-L/R-M/R-H) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated community areas; verify with the jurisdiction.

C-L, C-G, DMX, C-H

Purpose: Not found in retrieved materials.
Typical permitted uses: Commercial and mixed uses; selected residential types in commercial districts per use tables (Article 6 references appear in the tables) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated community/commercial nodes; verify with the jurisdiction.

I-L, I-H, OPRD

Purpose: Not found in retrieved materials.
Typical permitted uses: Industrial and research/distribution uses per industrial tables.
Key dimensional standards: Industrial zones’ minimum lot area, setbacks, height and FAR are codified in Table 8-2.705 (e.g., I-L 5,000 sq ft min lot; 45 ft/4-story height; FAR 0.5; coverage 90%) (§ 8-2.705) .
Where it applies: Unincorporated industrial areas and planned R&D parks; verify with the jurisdiction.

PQP, POS, P-R (Public/Quasi-Public and Open Space/Parks)

Purpose: Not found in retrieved materials.
Typical permitted uses: Public, civic, and open space functions; signage and renewable energy are addressed in Article 12 and Article 11 tables (e.g., solar siting) (§ 8-2.1206; § 8-2.1104) .
Key dimensional standards: Not found in retrieved materials.
Where it applies: Unincorporated public and open space lands; verify with the jurisdiction.

DP-O, SG-O, SGR-O, A-O (Overlays)

Purpose: Overlay-specific (e.g., SG-O/SGR-O signal active/reserve sand/gravel extraction areas; A-O airport safety). See § 8-2.905-2 and overlay text for use allowances and compatibility expectations .
Interaction with nonconformities: Overlays and safety/floodplain findings may further constrain changes to nonconforming sites (see levee/floodplain notes in Article 10) .

“Nonconforming” quick rules and time limits

Topic	What the code allows or prohibits	Time limit/Trigger	Permit path	Code reference
Continue a lawful nonconforming use or building	May continue; no enlargement/expansion/intensification unless authorized	Ongoing	N/A (unless seeking a change)	§ 8-2.1007(c)
Repair unsafe/unsanitary building	Allowed to restore to safe condition	N/A	Building permit as applicable	§ 8-2.1007(e)
Rebuild after fire/flood/etc.	Allowed; must meet current codes; no change to a different nonconforming use	N/A	Building permit + applicable standards	§ 8-2.1007(f)
Single-family on substandard lot	May reconstruct/enlarge if all other zone regs met	N/A	Ministerial/discretionary per scope	§ 8-2.1007(g)
Extend nonconforming use within a building	Possible	N/A	Use Permit (Planning Commission)	§ 8-2.1007(h)
Substitute one nonconforming use for another	Possible if same/more restrictive; cannot revert after change	N/A	Use Permit (Planning Commission)	§ 8-2.1007(i)
General cessation of a use	Nonconforming use status lost after discontinuance	12 months	N/A	§ 8-2.1007(j)
Building designed for nonconforming use	Cannot resume nonconforming use after cessation	24 months	N/A	§ 8-2.1007(k)
Building designed for conforming use but occupied by a nonconforming use	Cannot resume nonconforming use after cessation	12 months	N/A	§ 8-2.1007(l)
Nonconforming use of land (no/only minor structures)	Cannot resume; remove nonconforming structures	6 months to cease; remove within 12 months	N/A	§ 8-2.1007(m)
Nonconforming junkyards	Must add enclosure/screening	Within 1 year	Director review for screening plan	§ 8-2.1007(n)

Checklist

Confirm parcel lies in unincorporated Yolo County and identify the exact base zone/overlays on the zoning map.
Document that the use/structure was lawful when established (date, permits, evidence) to support nonconforming status under § 8-2.1007(b)–(c) .
Determine if any change proposed is an enlargement, expansion, or intensification; if yes, plan for a Use Permit under § 8-2.1007(h)–(i) .
Check cessation timelines and verify continuous operation within the last 6, 12, or 24 months, as applicable (§ 8-2.1007(j)–(m)) .
For rebuilds after calamity, align plans to current building/flood standards per § 8-2.1007(f) and applicable FEMA/local flood rules .
If signage or site improvements are part of the change, confirm compliance with signage and landscaping and screening standards (see § 8-2.1206–1208) .
If constraints make strict compliance impractical, consult variances and exceptions about potential relief; Verify with the jurisdiction.

Risks & Ambiguities

Issue	Why it matters	What to verify
Proving legal nonconforming status	Without proof, you lose continuation rights	Original permits, business licenses, assessor records, dated photos showing operation before the code change (verify with the jurisdiction)
“Intensification” vs. routine updates	Intensification can trigger Use Permit and/or denial	Whether the proposed change increases capacity, hours, floor area, traffic, or environmental impacts under § 8-2.1007(c), (h), (i)
Cessation clock	Missing a 6/12/24-month window can permanently end rights	Actual dates of discontinuance, interim uses, utility shut-offs, and evidence of continuous operation under § 8-2.1007(j)–(m)
Rebuild after disaster	Rebuilds are allowed, but only to current codes and without changing to a different nonconforming use	Alignment with § 8-2.1007(f) and current FEMA/local flood findings in Article 10; coordinate early with staff
Overlays and special areas	Airport/flood/mining overlays can add limits	Whether A‑O, SG‑O/SGR‑O, levee toe restrictions, or floodplain findings apply (§ 8-2.905-2; § 8-2.306)
ADUs with nonconforming conditions	State law limits denial for existing nonconformities	HCD guidance under Gov. Code §§ 66322–66323; see 2025 ADU Handbook summary and California ADU law

Plain-English Summary

If your property in unincorporated Yolo County has a lawful use or building that no longer matches current zoning, you can usually keep using it as-is. But if you stop using it too long, try to expand it, or swap in a different use, you’ll hit strict rules and possibly need a Use Permit. Keep good records, mind the 6–12–24 month cessation clocks, and loop in the County early if you’re rebuilding after a disaster or planning changes that might count as “intensification” under § 8-2.1007 .

Information Gaps

Official “purpose” statements for specific zones (A‑N, A‑X, A‑C, A‑I, A‑R; RR/R/L/M/H; C‑/DMX; I‑/OPRD; PQP/POS/P‑R) — Not found in retrieved materials.
Dimensional standards (setbacks, lot size, height) for agricultural and residential zones — Not found in retrieved materials.
Zone maps and boundary descriptions — Not found in retrieved materials.

Source References

Yolo County Code, Title 8, Chapter 2, Article 10: Nonconforming Buildings and Uses — § 8-2.1007(a)–(n) (purpose, definitions, continuation, repair, reconstruction, dwellings on substandard lots, extension/substitution by Use Permit, cessation timelines, junkyards)
Dedications and substandard yards (variance not required if no further reduction of nonconforming yard/setback) — County roadway dedication provisions (outside Article 10)
Industrial zone dimensional standards — § 8-2.705 (Table 8-2.705)
Overlay districts — § 8-2.905-2 (DP-O, SG-O/SGR-O, A-O) and overlay purposes within Article 9; flood/levee notes in § 8-2.306
Signs — § 8-2.1206–1208 (signs allowed and standards)
State ADU interaction with nonconforming conditions — 2025 HCD ADU Handbook (summarizing Gov. Code §§ 66322–66323)

Sources

Retrieved passages

Yolo County Zoning Code (chapter and) High relevance
CBC § 1963 (chapter shall) High relevance
CBC § 1963 (section shall) High relevance
Yolo County Zoning Code (Chapter 3) High relevance
Yolo County Zoning Code (Section 8-2.403) Medium relevance
Yolo County Zoning Code (article shall) Medium relevance
Yolo County Zoning Code (Chapter 4) Medium relevance
Yolo County Zoning Code (§ 66314) Medium relevance
Yolo County Zoning Code (Article 14) Medium relevance
Yolo County Zoning Code (Article 14) Medium relevance
Yolo County Zoning Code (Section 8-2.1102) Medium relevance
Yolo County Zoning Code (Article 14) Medium relevance
Yolo County Zoning Code (Article 14.) Medium relevance
Yolo County Zoning Code (Section 106) Medium relevance
Yolo County Zoning Code (Article 14) Medium relevance
Yolo County Zoning Code (Article 11.) Medium relevance

Cited sections

Official Yolo County code library

Frequently asked questions

Does Yolo County let me expand a nonconforming use in unincorporated areas?

Not by right. Expansions, intensifications, or enlargements are generally prohibited unless specifically authorized. The Planning Commission may allow limited extension within a building via a Use Permit, or substitution of one nonconforming use for a more restrictive one, under § 8-2.1007(h)–(i) .

How long can a nonconforming use sit vacant before I lose rights?

If a nonconforming use stops for 12 consecutive months, it is deemed to have ceased and may not resume. There are different timelines for land-only uses (6 months) and buildings designed for nonconforming uses (24 months). See § 8-2.1007(j)–(m) .

My nonconforming building burned down. Can I rebuild it?

Yes. You may restore or reconstruct a damaged nonconforming building, but the work must meet current building and flood standards, and you cannot change to a different nonconforming use as part of the rebuild. See § 8-2.1007(f) .

I have a small lot that doesn’t meet current minimums. Can I enlarge my house?

Possibly. Single-family dwellings on lots that are smaller or narrower than current standards may be reconstructed or enlarged if they comply with all other regulations of the zone. See § 8-2.1007(g) .

Do Yolo County sign and parking rules still apply to nonconforming sites?

Yes. Nonconforming status does not exempt you from current sign, parking, or landscaping rules. Check the sign tables in § 8-2.1206–1208 and the applicable parking and landscaping and screening standards .

Can I substitute my existing nonconforming use for another use?

Only with approval. The Planning Commission can permit substitution of one nonconforming use for another that is of the same or more restrictive nature; once changed to a conforming or more restrictive use, you can’t revert to a less restrictive or nonconforming use. See § 8-2.1007(i) .

Does state ADU law help if my property has a nonconforming condition?

Often, yes. A permitting agency generally may not deny an ADU solely because of existing nonconforming zoning conditions unless there’s a related health/safety issue affected by the ADU construction; see Gov. Code §§ 66322–66323 (summarized by HCD) and our California ADU law guide .

Do overlay zones affect how nonconforming rights are applied?

They can. Overlay districts like Airport (A‑O) or Sand & Gravel (SG‑O/SGR‑O) add compatibility and safety layers that may constrain modifications to nonconforming sites. Check § 8-2.905-2 and flood/levee notes in Article 10; Verify with the jurisdiction .

Ask about any Yolo County property

Get a cited, plain-English answer on Yolo County zoning, setbacks, FAR, ADUs and permits — for any address.

Start Free Trial