Local zoning · Fresno County

Fresno County — Nonconforming Uses

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

Ask a question free See coverage

Last reviewed: July 3, 2026

Overview

This page summarizes how the Fresno County Zoning Ordinance treats nonconforming uses, nonconforming structures, and nonconforming parcels that exist in the unincorporated areas of Fresno County. The controlling rules live in Chapter 870.6 of the County Zoning Ordinance; the chapter defines what is lawful to continue, what repairs or rebuilding are allowed, and when a nonconformity is lost or must be brought into conformity (§ 870.6.010–.110) . This page ties those rules to the zone districts where they commonly arise (residential, commercial, industrial) and highlights the most decision‑relevant numeric limits and permit routes.

When reading this page you may also need the County’s broader materials on permitted uses and development standards; see the Fresno County zoning & planning overview and the County’s rules for parking, setbacks, and design review for connected topics. Links to those pages are inline below where relevant.

Key nonconforming rules (plain list of the controlling rules)

  • The ordinance declares nonconforming uses and structures to be those that were legal when established but do not meet later zoning standards (§ 870.6.020) .
  • Maintenance and ordinary repairs of nonconforming structures are allowed; structural alterations are limited to those required by law or specifically authorized (§ 870.6.030 A–B) .
  • Additions/enlargements to nonconforming structures are generally prohibited unless the addition and the resulting use conform to the zone — with several narrow exceptions and director/Commission review options (§ 870.6.030.C) .
    • A typical director-review allowance caps "minor" additions at 15% of existing floor area; in M zones a limited 25% allowance applies if the existing unit is under 1,100 sq ft (otherwise 15%) (§ 870.6.030.C.1.c–d) .
  • A nonconforming use that is vacant for more than 12 months loses its nonconforming status and may only be re‑occupied by a conforming use (§ 870.6.040.A.2) .
  • Nonconforming uses may not be expanded into other portions of a structure and, once converted to a conforming use, may not revert back to the old nonconforming use (§ 870.6.040.B, § 870.6.080) .
  • Nonconforming off‑street parking: a structure lacking required parking may not be expanded until parking requirements for the addition are met; the Director can, however, review and modify parking requirements to encourage economic development (§ 870.6.070) .
  • Rebuilding after disaster: involuntarily damaged nonconforming structures may be rebuilt if repair costs do not exceed 50% of replacement value immediately before damage (as appraised) (§ 870.6.090) .
  • Special rules: elimination of temporary residential accessory dwellings in R‑1 zones, and the status of nonconforming uses authorized by prior permits or variances (§ 870.6.100; § 870.6.110) .

Where the ordinance refers to development details (setbacks, lot sizes, parking counts), those standards come from Article 2 tables and the County’s development rules; see the County’s pages for development standards and parking linked inline.

District-by-district breakdown (where nonconformities commonly occur)

Below are summaries for the zone districts most often implicated by nonconforming situations. Each district entry points to the table or rule that lists ordinary permitted uses and dimensional standards so you can check whether a use or structure is nonconforming on a particular parcel.

Note: these rules apply only in unincorporated areas of Fresno County.

R-1 (Single-Family Residential)

  • Purpose: preserve single‑family residential neighborhoods and lot patterns. See the Residential Zones tables for permitted uses. Accessory Dwelling Units (ADUs) are permitted under Article 2 rules (see ADU law guidance) .
  • Typical permitted uses: single‑family dwellings, accessory structures, limited home occupations (Table 2‑4‑1) .
  • Key dimensional standards: minimum parcel size 6,000 sq ft, front setback 35 ft, side 20 ft, rear 20 ft (summary values from Article 2 tables; see Section 822.3.100 for measurement rules) .
  • How nonconformity shows up: a pre‑existing house closer than the current front/side setback is a nonconforming structure; accessory temporary dwellings are addressed specifically by § 870.6.100 (elimination of temporary residential structures in R‑1) .

R-2 / R-2‑A (Low‑density Multi‑family / Mixed)

  • Purpose: allow small multi‑unit or medium‑density residential development; has more flexible accessory use rules than R‑1 .
  • Typical permitted uses: multi‑family dwellings, ADUs, second units (per Table 2‑4) .
  • Key dimensional standards: front setback 20 ft, side 5–12 ft depending on subzone, building height limits variable (see Article 2) .
  • How nonconformity shows up: substandard lot area or density limits that existed before a zone change will be treated as nonconforming parcels with occupancy limits set in the density rules (§ 820.3.040) .

R-3 / R-3‑A (Medium Density Residential)

  • Purpose: higher residential densities; multi‑family is common. Typical uses and permit requirements are in Table 2‑4. Nonconforming parcel occupancy limits are spelled out in § 820.3.040 (limitations by parcel area) .
  • Key dimensional standards: see Article 2 tables and Section 822.3.100 for setbacks and accessory structure rules .

R‑P (Residential‑Professional / Mixed)

  • Purpose: mixed residential/professional uses; allowances differ from strict residential districts (see Table 2‑6 for R‑P entries) .
  • Typical uses: mixed use, multi‑family, small professional offices; ADUs and certain residential uses allowed per table .
  • Nonconforming parcel rules that affect number of dwelling units are in § 820.3.040 and Table 2 entries for R‑P .

C (Commercial) — general (examples: C‑1, C‑2, C‑3, C‑4)

  • Purpose: retail, services, and commercial uses listed in Article 2 Tables (Table 2‑6). Typical permitted uses and permit types vary by specific C‑subzone .
  • Typical permitted uses: retail, restaurants, professional services; some residential uses (e.g., mixed‑use, apartments) are permitted in certain commercial zones .
  • Key dimensional standards and parking: commercial setback and parking requirements appear in Article 2 and Chapter 828.3; a commercial building that predates current standards may be a nonconforming structure for setbacks, signage, or parking (§ 870.6.050 for signs; § 870.6.070 for parking) .
  • Where it applies: unincorporated commercial strips, neighborhood centers; if a commercial property lacks required parking, it generally cannot be expanded until parking for the expansion is provided (§ 870.6.070) .

M (Industrial / Manufacturing; e.g., M‑1, M‑2, C‑M)

  • Purpose: manufacturing, processing, warehousing (listed in Table 2‑8). Nonconforming residential uses in manufacturing zones are treated strictly (see additions rules for residences in M zones) .
  • Typical permitted uses: industrial processing, warehousing, limited retail related to industrial uses per Table 2‑8 .
  • Key dimensional standards: setbacks and heights vary by M‑subzone; industrial properties with preexisting residences that don’t meet current parcel area or use rules are nonconforming and have special expansion limits — a nonconforming residence in an M zone may be allowed a 25% floor‑area increase when under 1,100 sq ft, otherwise 15%, subject to Director approval (§ 870.6.030.C.1.d) .

Quick reference table — most decision‑relevant nonconforming standards

Topic Rule / Limit Code Reference
Definition of nonconforming use/structure Lawful when established but not in compliance with later zoning § 870.6.020
Maintenance/repairs allowed Ordinary maintenance and repairs allowed; structural alterations limited § 870.6.030.A–B
Minor additions (Director review) Addition ≤ 15% of existing floor area (general) § 870.6.030.C.1.c
Addition for residence in M zone Up to 25% if existing < 1,100 sq ft; otherwise 15% § 870.6.030.C.1.d
Vacancy rule Vacant > 12 months → must be conforming use to re‑occupy § 870.6.040.A.2
Reconstruction after disaster Rebuild allowed if cost ≤ 50% of replacement value § 870.6.090
Nonconforming parking Cannot expand structure until parking for the addition complies; Director can modify parking § 870.6.070
Nonconforming signs Maintain in good repair; no structural alteration unless to comply § 870.6.050
Nonconforming parcels Substandard lots of record have special rules (see § 822.3.080 and density limits in § 820.3.040) § 822.3.080; § 820.3.040

Practical guidance / interpretation notes

  • If a structure or use is clearly older than current zoning and you want to change, expand, or re‑occupy it, start by confirming the nonconforming status under § 870.6.020 and then check the specific limitations for repairs, additions, or vacancy in § 870.6.030–.090 .
  • For small expansions that might fit the 15% rule, the Director’s review path (Chapter 846.5) is commonly used — expect plan submittal and evidence the addition does not deepen a setback encroachment (§ 870.6.030.C.1.c and cross‑ref to Director’s review) .
  • If the property lacks required parking, do not assume you can expand the building without addressing parking for the new area; the Director has limited discretion to modify parking to encourage economic development, but the parking rule is explicit (§ 870.6.070) .
  • When a nonconforming use has been discontinued, the 12‑month vacancy clock is decisive; a use vacant longer than 12 months can only be re‑established as a conforming use (§ 870.6.040.A.2) .
  • Where reconstruction is needed after fire or natural disaster, document appraised replacement value carefully — exceed 50% and the ordinance restricts reconstruction (§ 870.6.090) .

Alongside these nonconforming rules you'll often need to look up permitted uses, setbacks, and parking in Article 2 and Chapter 822.3 — for example, check the County’s pages on development standards and parking before preparing plans or applications. Links to the County pages for development standards, parking, overlays, and design review are embedded earlier in this page for convenience.

Checklist

  • Confirm whether the use/structure was lawful when established and therefore qualifies as a nonconforming use/structure (§ 870.6.020) .
  • If proposing repairs or an addition, confirm ordinary repair vs. structural alteration status and whether the proposed work is within the 15% (or 25% for small M‑zone residences) allowance (§ 870.6.030.C) .
  • If the property lacks required parking, calculate parking for the proposed new area and prepare to meet parking rules or request Director modification (§ 870.6.070) .
  • If the nonconforming use has been vacant, confirm vacancy period; if > 12 months, plan for a conforming use only (§ 870.6.040.A.2) .
  • For reconstruction after damage, obtain a qualified appraisal to confirm the ≤ 50% threshold if rebuilding is proposed (§ 870.6.090) .
  • Verify applicable zone‑specific development standards (setbacks, height, parcel size) in Article 2 and Chapter 822.3 to determine exact nonconformity parameters (e.g., R‑1 min parcel size, setbacks) .
  • If needed, prepare a Variance or Minor Deviation application (Chapter 860.5) or Director’s Review (Chapter 846.5) and expect public notice/hearing processes per the applicable chapter .

Risks & Ambiguities

Issue Why it matters What to verify
Vacancy over 12 months Loss of legal nonconforming status; re‑occupancy limited to conforming uses (§ 870.6.040.A.2) Verify continuous occupancy records (business licenses, utility bills) and confirm date vacancy began.
Rebuild cost > 50% (disaster) If repairs exceed 50% of replacement value, reconstruction protections do not automatically apply (§ 870.6.090) Obtain independent appraisal and consult the Director early.
Additions into setbacks Additions that extend further into a setback are generally not allowed; some lateral extensions permitted only within the existing encroachment limit (§ 870.6.030.C.3) Measure existing encroachment and check whether the side/front yard is < 50% required depth (an exception reference in § 870.6.030.C.3) — Verify with the jurisdiction.
Nonconforming parking Expansion blocked until parking for the addition complies; Director can modify but it’s discretionary (§ 870.6.070) Confirm existing parking count, design, and whether the site is in a municipal parking district (exemption) and consult Public Works/Traffic if needed.
District-specific numeric thresholds (e.g., 15%, 25%, 1,100 sq ft) Small numeric thresholds control eligibility for Director review expansions (§ 870.6.030.C.1.c–d) Confirm how floor area is measured and whether accessory areas count; obtain Director interpretation for parcel‑specific application.
Nonconforming parcels/density Some R‑zone density rules cap permitted dwellings on substandard lots (§ 820.3.040) Verify recorded parcel size at date of nonconformance and consult § 820.3.040 and Article 2 tables.

Plain‑English Summary

If your building or use in an unincorporated part of Fresno County was legal when it started but no longer meets today’s zoning rules, the County generally lets you keep it — you can maintain it and make ordinary repairs, but you usually cannot expand it, and long vacancies or major rebuilds can terminate the nonconforming status; see Chapter 870.6 for the exact rules (§ 870.6.010–.110) .

Source References

  • Fresno County Zoning Ordinance — Chapter 870.6, “Nonconforming Uses, Structures, and Parcels” (§ 870.6.010–.110) —
  • Fresno County Zoning Ordinance — § 870.6.030 (Nonconforming Structures), § 870.6.040 (Nonconforming Uses), § 870.6.070 (Parking), § 870.6.090 (Reconstruction) —
  • Article 2, Tables of Zones (Residential, Commercial, Industrial) — Tables 2‑4, 2‑6, 2‑8 (zone uses and permit requirements; R‑1, R‑2, R‑3, C, M summaries) —
  • Parcel and development standards, setbacks, accessory structures — Chapter 822.3 (parcel standards, setbacks) —
  • Density and nonconforming parcel occupancy rules — § 820.3.040 —
  • Variance and Minor Deviation procedures (where relief may be sought) — Chapter 860.5 —

Also see these Fresno County pages for related technical rules (linked inline where each topic is first referenced earlier in the page):

  • Fresno County zoning & planning overview (/us/california/fresno-county)
  • Fresno County Parking (/us/california/fresno-county/parking)
  • Fresno County Development Standards (/us/california/fresno-county/development-standards)
  • Fresno County Design Review (/us/california/fresno-county/design-review)
  • Fresno County Overlay Districts (/us/california/fresno-county/overlay-districts)
  • California Building Standards Code (/us/california/building-codes)
  • California ADU law (/us/california/california-adu-laws)

(If you need the actual adopted zone map or the exact Article 2 table cell for a given parcel, request a parcel‑specific lookup or a copy of the County’s Zone Map — Verify with the jurisdiction.)

Sources

Retrieved passages

  • Fresno County Zoning Code (Chapter 15.32) High relevance
  • Fresno County Zoning Code (Chapter 870.6) High relevance
  • Fresno County Zoning Code (Chapter 870.6) High relevance
  • Fresno County Zoning Code (Chapter 876.6) High relevance
  • Fresno County Zoning Code (Section shall) High relevance
  • Fresno County Zoning Code (Chapter 870.6) High relevance
  • Fresno County Zoning Code (CHAPTER 870.6) High relevance
  • Fresno County Zoning Code (Article 7) High relevance
  • Fresno County Zoning Code (Chapter 846.5.) Medium relevance
  • Fresno County Zoning Code (Section 834.4.020) Medium relevance
  • Fresno County Zoning Code (Chapter 810.2) Medium relevance
  • Fresno County Zoning Code (Article 7) Medium relevance
  • Fresno County Zoning Code (Article 2) Medium relevance
  • Fresno County Zoning Code (Article 7) Medium relevance
  • Fresno County Zoning Code (Article 7) Medium relevance
  • Fresno County Zoning Code (Article 7) Medium relevance

Cited sections

Frequently asked questions

What is a nonconforming use in unincorporated Fresno County?

A nonconforming use is a use that was lawful when established but later conflicts with new zoning rules; the County defines this in § 870.6.020 and regulates maintenance, expansion, and discontinuance in Chapter 870.6 .

Can I repair or remodel a nonconforming building in Fresno County?

Ordinary maintenance and repairs are allowed; structural alterations are restricted and additions are generally prohibited unless they conform or meet limited Director/Commission criteria (see § 870.6.030) .

If my nonconforming business closes, how long can it stay vacant?

If a nonconforming structure or use is vacant for more than 12 months, it cannot be re‑occupied by the former nonconforming use — re‑occupancy must be a conforming use (see § 870.6.040.A.2) .

Can I expand a nonconforming house in an industrial (**M**) zone?

There are narrow allowances: a nonconforming residence in an M zone may be eligible for an addition up to 25% of existing floor area if the residence is under 1,100 sq ft; otherwise limits are 15%, and Director review applies (§ 870.6.030.C.1.d) .

What happens if my nonconforming building is damaged by fire?

You may reconstruct a nonconforming structure after involuntary damage if the cost of reconstruction does not exceed 50% of the structure’s reasonable replacement value immediately before the damage (§ 870.6.090) — obtain an appraisal early .

Does a building without required off‑street parking qualify as nonconforming?

Yes. If the structure predates current parking rules, it is nonconforming for parking; you generally cannot expand the structure until parking for the new area complies, though the Director can review and modify parking requirements in some economic‑development circumstances (§ 870.6.070) .

How do nonconforming parcels (substandard lots) work in residential zones?

Legally created substandard parcels of record can be used under specific occupancy/density limits set in § 820.3.040 and subject to Article 2 dimensional rules; certain R‑zone exceptions and side/front yard adjustments exist (see § 822.3.080) .

If I change my nonconforming use to a conforming use, can I ever go back?

No. Any portion of a building or site converted to a conforming use may not be reused later for the former nonconforming use (§ 870.6.080) .

Are there special rules for nonconforming signs?

Nonconforming signs must be kept in good repair and may not be structurally altered except to bring them into compliance; Commission hardship relief is possible in limited cases (§ 870.6.050) .

When should I seek a Variance or Minor Deviation for a nonconforming situation?

If the relief you need falls outside the Director’s minor deviation allowances (see Chapter 860.5 for allowable minor deviations, including limited work on nonconforming structures), you should prepare a Variance application which requires a public hearing and findings by the Commission (§ 860.5; see also § 870.6.110 for nonconforming uses authorized by prior permits) .

More in Fresno County code

Ask about any Fresno County property

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

Start Free Trial

More Fresno County zoning topics

Fresno County Zoning

Fresno County Land Use

Fresno County Development Standards

Fresno County Parking

Fresno County Design Review

Fresno County Overlay Districts

Fresno County Historic Preservation

Fresno County Signage

Fresno County Variances and Exceptions

Fresno County Landscaping and Screening

Fresno County overview