Local zoning · Tuolumne County

Tuolumne County — Land Use

Land Use under the Tuolumne 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 land use is regulated in the unincorporated areas of Tuolumne County under the County Zoning Ordinance (commonly codified as Title 17). It explains what uses are allowed or conditional in each zoning district, the most decision-relevant dimensional and intensity standards, and where to look in the ordinance for specific use tables and review triggers. For rules about “setbacks and development standards” see the County’s Development Standards; for rules about parking see the County’s Parking page; design triggers are explained on the County’s Design Review page. The County’s Zoning overview is at Tuolumne County Zoning. All statements below apply only to the unincorporated areas of Tuolumne County and are grounded in the County Zoning Ordinance text cited with the controlling § and the uploaded ordinance file.

The County organizes allowed and conditional uses primarily via use tables (Table 17.12.1, Table 17.14.1, Table 17.20.1, etc.) and by zoning district. If a use is not listed, the Director may determine a similar use is allowable under the rules for "Similar uses allowed" — see § 17.06.020(C).

District-by-district breakdown (unincorporated Tuolumne County)

Note: For the full enumeration of permitted and conditional uses in each district consult the corresponding use table referenced below (e.g., Table 17.12.1, Table 17.14.1, Table 17.20.1). Where the Code lists a table, the abbreviated description below points you to the controlling § and the uploaded ordinance file for the full table.

R-1 — Single-Family Residential (§ 17.12.020)

  • Purpose: Provide areas for single-family residential development at suburban/low densities.
  • Typical permitted uses: single-family dwellings, accessory structures and garages (see Table 17.12.1 for full list). See density and accessory-use rules in the table.
  • Key dimensional/intensity rules: maximum 6 dwelling units per acre, FAR 0.5 (larger for very small lots per the section), and minimum lot size exceptions for existing substandard parcels; height generally limited by the general height table (see § 17.22.020).
  • Where it applies: Typical residential neighborhoods in unincorporated Tuolumne County. Verify parcel zoning on the official map.

R-2 — Medium Density Residential (§ 17.12.030)

  • Purpose: Support duplexes, small multi-family and other medium-density residential uses.
  • Typical permitted uses: duplexes, small multi-family, accessory uses — consult Table 17.12.1.
  • Key standards: maximum 12 dwelling units per acre, FAR 0.5, minimum parcel size 7,500 sq ft (net) for new divisions.

R-3 — Multiple-Family Residential (§ 17.12.040)

  • Purpose: Higher-density apartment or multiple-family development.
  • Typical uses: apartments, multifamily dwellings, mobile home parks (where allowed) — see Table 17.12.1.
  • Key standards: maximum 15 dwelling units per acre without discretionary review for the district (see small-lot provisions); minimum parcel size 12,500 sq ft (net) for new divisions.

RE-1 / RE-2 / RE-3 / RE-5 / RE-10 — Residential Estate Districts (various §§ in 17.12, e.g., § 17.12.050–090)

  • Purpose: Very low-density residential estate development with large minimum parcel sizes (1 acre, 2 acres, 3 acres, 5 acres, 10 acres respectively).
  • Typical uses: single-family dwellings, limited accessory uses, limited agricultural/animal-keeping subject to standards (see Chapter 17.12 and the animal and beekeeping standards).
  • Key standards: Minimum parcel sizes correspond to the district name (e.g., RE-3 = 3 acres, RE-5 = 5 acres, RE-10 = 10 acres); building intensity expressed as one dwelling per the stated acreage and FAR limits (see the specific RE section).

MU — Mixed Use (§ 17.14.020)

  • Purpose: Allow a blend of residential and commercial uses with higher intensity near nodes and corridors.
  • Typical permitted uses: Mixed residential, retail, service and limited office uses as indicated in Table 17.14.1 with varying levels of discretionary review.
  • Key standards: maximum 15 dwelling units per acre without discretionary review, FAR up to 2.0, minimum density 8 du/acre (unless constrained); minimum parcel size and frontage rules apply. Additional units or FAR possible through state density bonus.

C-O / C-1 / C-2 / C-S / C-K — Commercial Districts (see § 17.14.040 and surrounding sections)

  • Purpose: Different commercial districts provide neighborhood-level retail (C-O), general commercial (C-1), heavy/wholesale commercial (C-2), special commercial for unsewered/unwatered areas (C-S), and commercial-recreational (C-K).
  • Typical uses: retail, offices, restaurants, lodging, recreational commercial (C-K); permitted vs. conditional status is listed in Table 17.14.1.
  • Key standards: Minimum parcel sizes and FAR/height rules vary by district; see the specific district section and Table 17.14.1. For example, C-K has minimum parcel size 2 acres and FAR 0.5 for residential intensity where applicable.

BP — Business Park (§ 17.14.x)

  • Purpose: Campus-style business/industrial park uses emphasizing manufacturing, processing, storage and research within park settings. (Ordinance update reference in the code.)
  • Typical uses: light manufacturing, research & development, distribution, and related offices; permitted use list and conditions appear in the district use table.

M-1 / M-2 / MPZ — Industrial / Manufacturing Districts (Article 2 Chapters)

  • Purpose: Provide locations for industrial and manufacturing operations; specific allowable uses and standards are in the industrial district sections and use tables. Not all manufacturing/warehouse uses are permitted in residential or overlay districts.

A-20 / A-10 / AE-160 / AE-80 / AE-37 — Agricultural and Exclusive Agricultural Districts (§ 17.20.x)

  • Purpose: Protect agricultural uses and implements Williamson Act compatibility; AE-160, AE-80, AE-37 identify minimum parcel sizes for agricultural exclusivity under County rules.
  • Typical uses: agricultural production, compatible farm-related uses, accessory farm structures; compatible and conditional uses are listed in Table 17.20.1; some uses require approval of an agricultural management plan by the Board of Supervisors and Agricultural Advisory Committee.
  • Key rules: Minimum parcel sizes for divisions in AP/AE districts are specified (e.g., commercial agricultural uses — 160, 80, 37, or smaller depending on use as in § 17.20.080(G) and its subparts). See Table 17.20.1 for permitted uses and compatible-use rules.

O / O-1 — Open Space / Open Space-1 (§ 17.20.x)

  • Purpose: Preserve open space, recreation, habitat areas. Permitted uses are limited and set out in Table 17.20.1; management plans are required for some combined Open Space designations.

AP — Agricultural Preserve Combining District (Williamson Act) (§ 17.20.x)

  • Purpose: Special combining district that restricts division and certain uses to preserve agricultural/open-space values under Resolution 106-04 and the Williamson Act. Minimum parcel sizes and compatible-use lists apply; divisions that defeat the Williamson Act purpose are prohibited.

:AIR — Airport Combining District / Compatibility Zones (§ 17.20.050 et seq.)

  • Purpose: Overlay combining district to implement airport land use compatibility plans (Columbia, Pine Mountain Lake). Special restrictions on residential density, nonresidential intensity, and hazards to flight apply.
  • Key rules: Residential density and nonresidential intensity must conform to the airport compatibility plan’s Table 2A; some uses are explicitly prohibited or limited by compatibility zone; infill exceptions are narrowly defined.

Combining and Overlay Districts (:H, :HDP, :D, Historic, etc.)

  • Purpose: Combining districts modify base zone rules (for example historic preservation or hillside designations). Historic overlays may trigger additional review; see the County’s Overlay Districts and Historic Preservation pages for process guidance. The ordinance notes some prohibitions for wireless and major facilities within certain overlays (see wireless rules).

Quick reference table — common decision‑relevant items

Topic / Use Typical status (example district) Key numeric standard or note Code Reference
Single-family dwelling Permitted in R-1, RE, A R-1: 6 du/acre; FAR 0.5 § 17.12.020
Duplex / small multifamily Permitted in R-2; R-3 allows higher R-2: 12 du/acre; R-3: up to 15 du/acre § 17.12.030–040
Mixed-use intensities MU permits mixed uses MU: max 15 du/acre; FAR up to 2.0 § 17.14.020
Agricultural uses / Williamson Act Permitted in AE/AP districts Minimum parcel sizes vary (160/80/37/10 etc. depending on use) § 17.20.x
Height limit (typical) Residential zones 40 ft typical; some commercial/industrial 50 ft per § 17.22.020 § 17.22.020
Accessory structures / garages Permitted with conditions Garage limits noted in use tables (e.g., max 4,000 sq ft or % of parcel) Table 17.12.1 / Table 17.20.1
Public utilities / EV stations Utilities permitted with exceptions Distribution permitted in most districts; EV stations regulated in § 17.82 § 17.80.030; § 17.82

(Full, cell-level permitted/conditional use lists are in each district’s Table — see the ordinance tables referenced above.)

Checklist — What an applicant must satisfy (unincorporated Tuolumne County)

  • Confirm parcel zoning and any combining overlays on the official County zoning map; verify Airport (:AIR) overlay if near Columbia or Pine Mountain Lake. Verify with the jurisdiction.
  • Confirm the proposed use is listed as Permitted (P) or Conditional (C) in the district’s use table (Table 17.12.1, 17.14.1, 17.20.1). If not listed, prepare a justification under § 17.06.020(C) for a similar-use determination.
  • Meet minimum parcel-size and lot-dimension rules for the district (e.g., R-2 minimum 7,500 sq ft net; RE minimums are acreage-based) — see the district section (e.g., § 17.12.030).
  • Demonstrate compliance with dimensional standards: setbacks, height (§ 17.22.020), FAR/density caps; consult Development Standards.
  • Provide required parking per County rules (see Parking); off-street parking requirements may be listed with the use table or in development standards.
  • If the use is listed as conditional, prepare the Use Permit application materials required by Chapter 17.98 and meet findings for discretionary approvals.
  • If in an overlay (Historic, :AIR, AP), address overlay-specific plans or management plan approval requirements. See Overlay Districts and relevant Code provisions.
  • Check fire-safety and water/sewer conditions (Title 15 and 17.80.040) — urban densities and most commercial uses require connection to public sewer/water as specified. See the County’s public-utility standards.

Risks & Ambiguities

Issue Why it matters What to verify
Unlisted or new use The ordinance allows only listed uses unless the Director finds a similar-use match; getting it wrong can require rezoning. Confirm if the Director has provided a similar-use determination or whether rezoning / Zoning Ordinance amendment is required (see § 17.06.020(C)).
Combining districts (AP, :AIR, Historic) Overlays add restrictions (e.g., Williamson Act minimums, airport compatibility limitations). Check overlay boundaries and any required management plans, and verify parcel-specific compatibility zones (see § 17.20.050 and Table 2A of the airport plan).
Parcel legal/nonconforming size Existing lots may be substandard but can still build subject to conditions — but variance or reduced setbacks may be needed. Verify whether the parcel is treated as a legal nonconforming lot and whether Chapter 17.32 (Nonconforming Uses) applies. See Nonconforming Uses. Not found in retrieved materials: specific nonconforming relief timelines.
Fire safety & utilities Some higher-density or commercial projects are required to connect to public sewer/water and meet County fire-code Title 15 standards; failure can block approval. Confirm availability of public water/sewer and fire flow; review § 17.80.040 and Title 15 requirements.
Ambiguous zoning map lines Boundary location rules affect which district rules apply. If zoning boundary is unclear, the ordinance instructs how to resolve it (lot lines, map scale) — see § 17.06 rules for map boundaries and interpretation.

Plain‑English Summary

Tuolumne County’s Zoning Ordinance assigns each unincorporated parcel a specific zone with a table that lists what is allowed (permitted) and what requires discretionary approval (conditional). Typical constraints you must check first are whether your use is listed in the district’s table, the district’s minimum lot size and density caps (for example, R‑1 = 6 du/acre, MU = 15 du/acre, FAR up to 2.0), height rules, and any overlay (AP, :AIR, Historic) that adds extra limits — all cited in the County code.

Source References

  • Tuolumne County Zoning Ordinance (Title 17, various sections) — see § 17.02.060 (Applicability)
  • § 17.06.020(C) (Similar-use/Interpretation rules)
  • § 17.12.020 (R-1 Single-Family Residential district; density/FAR)
  • § 17.12.030–040 (R-2, R-3 district provisions; minimum sizes/density)
  • § 17.12.070–090 (RE-3 / RE-5 / RE-10 residential estate minimums and intensity)
  • § 17.14.020 (Mixed Use MU district: density, FAR, minimum densities)
  • Use tables: Table 17.12.1, Table 17.14.1, Table 17.20.1 (permitted vs conditional uses and notes) — see the ordinance tables in the uploaded file.
  • § 17.20.x (Agricultural, AE/AP districts; Williamson Act/management plan rules)
  • § 17.20.050 et seq. (:AIR Airport Combining District — compatibility criteria)
  • § 17.22.010–040 (Standards for all development: height, setbacks, parcel/yard rules)
  • § 17.80.030–040 (Public utility uses; sewer/water connection expectations)
  • § 17.82 (Electric vehicle recharging stations)
  • Ordinance administrative and amendment rules, use-permit findings: § 17.98, § 17.305 (Zoning amendments) — see the ordinance file for procedure language.

Also useful County menu pages (internal guides referenced above):

Sources

Retrieved passages

  • Tuolumne County Zoning Code (Title 15) High relevance
  • Tuolumne County Zoning Code (Title 15) High relevance
  • Tuolumne County Zoning Code (Section 51238.1) High relevance
  • Tuolumne County Zoning Code (Chapter 17.32) High relevance
  • Tuolumne County Zoning Code (Section 51201) High relevance
  • Tuolumne County Zoning Code High relevance
  • Tuolumne County Zoning Code (Title 15) High relevance
  • Tuolumne County Zoning Code High relevance

Cited sections

  • Tuolumne County Zoning Ordinance (Title 17, various sections) — see **§ 17.02.060** (Applicability) (Title 17)
  • **§ 17.06.020(C)** (Similar-use/Interpretation rules) (§ 17.06.020)
  • **§ 17.12.020** (R-1 Single-Family Residential district; density/FAR) (§ 17.12.020)
  • **§ 17.12.030–040** (R-2, R-3 district provisions; minimum sizes/density) (§ 17.12.030)
  • **§ 17.12.070–090** (RE-3 / RE-5 / RE-10 residential estate minimums and intensity) (§ 17.12.070)
  • **§ 17.14.020** (Mixed Use MU district: density, FAR, minimum densities) (§ 17.14.020)
  • Use tables: **Table 17.12.1, Table 17.14.1, Table 17.20.1** (permitted vs conditional uses and notes) — see the ordinance tables in the uploaded file.
  • **§ 17.20.x** (Agricultural, AE/AP districts; Williamson Act/management plan rules) (§ 17.20.x)
  • **§ 17.20.050 et seq.** (:AIR Airport Combining District — compatibility criteria) (§ 17.20.050)
  • **§ 17.22.010–040** (Standards for all development: height, setbacks, parcel/yard rules) (§ 17.22.010)
  • **§ 17.80.030–040** (Public utility uses; sewer/water connection expectations) (§ 17.80.030)
  • **§ 17.82** (Electric vehicle recharging stations) (§ 17.82)
  • Ordinance administrative and amendment rules, use-permit findings: **§ 17.98, § 17.305** (Zoning amendments) — see the ordinance file for procedure language. (§ 17.98)
  • Tuolumne County zoning & planning overview
  • Tuolumne County Zoning
  • Tuolumne County Development Standards
  • Tuolumne County Parking
  • Tuolumne County Design Review
  • Tuolumne County Overlay Districts
  • Tuolumne County Historic Preservation
  • Tuolumne County Nonconforming Uses
  • California Building Standards Code — for building-code level requirements (Title 24) that are outside the scope of zoning. (Title 24)
  • California ADU law — state ADU rules that may affect allowable unit counts even when local zoning allows ADUs.
  • TuolumneCounty_ZoningCode.md

Frequently asked questions

What can I build on an R-1 lot in Tuolumne County?

In unincorporated Tuolumne County, R-1 (Single‑Family Residential) primarily allows single‑family dwellings and accessory structures. Density is capped at 6 dwelling units per acre and FAR and small‑lot FAR exceptions are set out in § 17.12.020; the detailed permitted and conditional uses are listed in Table 17.12.1. Verify parcel-specific conditions and setbacks with the County.

What are Tuolumne County setback and height requirements?

Setbacks and yard rules are in the development-standards chapters and the district-specific sections; general height caps are given in § 17.22.020 (typically 40 ft in many residential districts; 50 ft in many commercial/industrial districts). See § 17.22.010–040 and the district section that applies to your parcel.

Do I need a Use Permit for my proposed commercial activity?

Check the use tables (Table 17.14.1 for commercial districts). If the table marks the use “C” (conditional) for your district, a Use Permit is required; discretionary permits must meet the findings in the ordinance and follow Chapter 17.98 procedures. If the use is not listed, you may need a similar‑use determination or rezoning per § 17.06.020(C).

Are accessory dwelling units (ADUs) allowed by the County zoning?

Local ADU rules interact with state law. The County’s zoning lists accessory-dwelling-related provisions within residential district tables; state ADU law also applies. Consult the County’s zoning table for the district and the state ADU rules at California ADU law. If the Code is silent or restrictive beyond state law, verify with the County. Not found in retrieved materials: detailed, consolidated County ADU ordinance text separate from the district tables.

How does the Airport Combining (:AIR) District affect development?

The :AIR overlay applies airport‑compatibility criteria (residential density and nonresidential intensity limits) based on compatibility zones (Table 2A of the airport plan). The Code requires conformance with those criteria and allows limited infill exceptions under narrow conditions. See § 17.20.050 and the Airport Combining District provisions for zone‑specific rules.

If my use is not in the County’s use table, can I still do it?

Possibly. The Director can find an unlisted use allowable if it is similar in impacts and fits the district’s purpose under § 17.06.020(C). If not appropriate, you may need rezoning or a Zoning Ordinance amendment. Always confirm with the Community Development Department.

Where are the agricultural/Williamson Act compatibility rules?

Agricultural and Agricultural Preserve rules (AP/AE districts) and compatible/conditional uses are listed in Table 17.20.1, and minimum parcel/division sizes under Williamson Act considerations are set out in the AP/AE sections (see § 17.20.080(G) and subparts). Some compatible uses require a Board-approved management plan under Resolution 106‑04.

Are wireless towers allowed everywhere in the County?

Major wireless communication facilities are declared conditional uses and may be prohibited in certain districts or when combined with overlays such as :H, :HDP, or :D; specific thresholds and application information are in the County’s wireless facility chapter (see the wireless communications rules). Check § 17.94 for details and application submittal requirements.

Do parking requirements change by district?

Yes — required parking is determined by use and often by the district or specific use chapter. Small‑lot and multi‑unit projects have stated parking expectations (for example, small‑lot subdivision parking minimums are spelled out in the small-lot subdivision article). See the County’s Parking page and the district use tables where parking requirements are noted.

What if my parcel straddles a zoning boundary?

The Ordinance instructs how to resolve uncertain map boundaries (use lot lines/centerlines/scale) — see § 17.06 for the rules on interpreting zoning map boundaries. If still unclear, confirm with the County’s mapping staff.

Who enforces the zoning rules and who interprets ambiguous cases?

The County’s Community Development Department Director, Planning Commission, and Board of Supervisors administer the ordinance; the Director is assigned interpretation authority and can make determinations (see § 17.02.080 and § 17.06.020).

More in Tuolumne County code

Ask about any Tuolumne County property

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

Start Free Trial

More Tuolumne County zoning topics

Tuolumne County Zoning

Tuolumne County Development Standards

Tuolumne County Parking

Tuolumne County Design Review

Tuolumne County Overlay Districts

Tuolumne County Historic Preservation

Tuolumne County Signage

Tuolumne County Nonconforming Uses

Tuolumne County Variances and Exceptions

Tuolumne County Landscaping and Screening

Tuolumne County overview