Local zoning · Mendocino County

Mendocino County — Land Use

Land Use under the Mendocino County local zoning and planning code, with the controlling citations.

Last reviewed: July 6, 2026

Overview

In unincorporated areas of Mendocino County, land use is controlled by the County’s Zoning Ordinance, codified as Title 20. The inland rules are in Division I (Mendocino County Zoning Code—Division I), which applies to unincorporated property outside the Coastal Zone (§ 20.004.030 ). Coastal Zone areas use the Coastal Zoning Code (Title 20, Divisions II/III), including the Town of Mendocino and Gualala community plans. Across both geographies, only the uses listed as permitted or conditionally permitted for a district are allowed; everything else is prohibited (§ 20.004.045 for inland; § 20.604.025 for the Mendocino Town Plan area ).

Plain-English rule of thumb: If a use is not listed as permitted or conditionally permitted in your base zoning (and any applicable combining/overlay district), it isn’t allowed in unincorporated Mendocino County (§ 20.004.045; § 20.604.025 ).

Use this page with the Mendocino County Zoning and Mendocino County Development Standards pages, and check related requirements like parking, design review, overlay districts, historic preservation, and nonconforming uses as they come up.

How districts and “use types” work

Inland zoning districts are established in § 20.040.005 with symbols such as R-R, U-R, A-G, R-1, C-1, I-1, O-S, etc. (§ 20.040.005 ).
Inland district chapters then reference broader “use type” groupings (e.g., Residential, Civic, Commercial, Agricultural, Extractive) that determine what’s allowed by right, with an Administrative Permit, or with a Use Permit (e.g., R-3 references Chapters 20.016–20.036; see § 20.080.015–.020 ).
In the Mendocino Town Plan area and Gualala, the Coastal Zoning Code organizes use types similarly and adds community plan–specific districts and standards (§ 20.612.005–.010; Gualala §§ 20.405–20.407A ).

Inland zoning districts (Division I) — unincorporated areas outside the Coastal Zone

The County lists these inland districts in § 20.040.005. Below are the districts with retrieved, district-specific land use standards. For any district not detailed here, see “Information Gaps.”

R-R — Rural Residential

Purpose and where it applies: Large-lot rural living and small-scale farming in unincorporated inland areas (§ 20.040.005; § 20.048.025, -030 ).
Typical permitted/conditional uses:
- Permitted or by administrative permit: Family Residential; selected Cottage Industries; certain agricultural and civic uses (see § 20.048.010–.020; detailed lists include cottage industries and some civic uses) .
- Use Permit: Cluster development; selected commercial recreation; winery; mining (§ 20.048.020(E) ).
Key standards: Minimum lot areas range from 40,000 sf (R-R:L-1) up to 10 acres (R-R:L-10). Setbacks increase with lot size tier: e.g., 20 ft fronts/rears at L-1/L-2; 30 ft at L-5; 50 ft at L-10 (§ 20.048.025–.035 ).

U-R — Upland Residential

Purpose/where: Remote residential with very large lots (L-20/L-40) in inland unincorporated areas (§ 20.040.005; § 20.056.025 ).
Typical permitted/conditional uses:
- Administrative Permit: Several residential types (single-family, two-family), selected civic and commercial (e.g., small schools) per § 20.056.015 (excerpted lists) .
- Use Permit: Cluster development; transient lodging; resort/recreation; winery; mining (§ 20.056.020 ).
Key standards: Minimum lot area 20 or 40 acres; density 1 unit/20 or 40 acres; minimum front/rear setbacks 50 ft (§ 20.056.025–.035 ).

R-3 — Multiple-Family Residential

Purpose/where: Higher-density residential in appropriate inland communities (§ 20.040.005; § 20.080.025–.030 ).
Typical permitted/conditional uses:
- Admin Permit: Single-family, two-family, and dwelling groups; parking facilities (§ 20.080.015(C) ).
- Use Permit: Mobile home parks; educational facilities; indoor commercial recreation; limited lodging; mining (§ 20.080.020 ).
Key standards: Lot area and density vary by utility service—e.g., with water/sewer, multi-family up to 1 unit/1,500 sf; without utilities, multi-family not permitted. Front/rear setbacks 20 ft (§ 20.080.025–.035 ).

MU-2 — Mixed Use 2 (General Mixed Use)

Purpose/where: Mixed-use development in designated inland areas; site/compatibility standards apply (§ 20.040.005; § 20.085.055 ).
Typical uses: Residential and commercial mixes as allowed by the MU-2 chapter, subject to mixed-use compatibility standards (e.g., required separation distances between residential and industrial; landscape buffers along agricultural edges) (§ 20.085.055(A)(2)–(3) ).
Key standards: Minimum lot 12,000 sf; building height 50 ft; FAR 0.3–1.0 for non-residential; residential density up to 1 unit/1,500 sf (bonus possible) (§ 20.085.025–.050 ).

MUNS — Mixed Use North State Street

Purpose/where: Mixed-use along the North State Street corridor per Ukiah Valley Area Plan reference (§ 20.040.005; see district list) .
Standards and uses: Similar mixed-use framework as MU-2, with compatibility standards including minimum separations (e.g., 300 ft from industrial uses; fencing and 50-ft vegetated buffers next to agricultural land) (§ 20.087.055(A)(2)(a)–(c) ).
Key standards: Height 50 ft; non-residential FAR 0.3–1.0; lot/yard standards provided in chapter (§ 20.087.045–.055; .035–.040 ).

Cannabis land uses (inland)

Cannabis cultivation is prohibited unless expressly allowed by Chapter 20.242 (inland), in coordination with MCCO Chapter 10A.17. Zoning clearance or an administrative permit is required, and allowances vary by zoning district and license type (§ 20.242.010–.040; Tables 1–2 ).
Example: New or existing cultivation in R-R, A-G, U-R, I-1/I-2 may be permitted with Zoning Clearance or Administrative Permit depending on license type; some districts or larger licenses are not allowed (see Table 1/2 in §§ 20.242.040, 20.242.070) .

Other inland base districts listed in § 20.040.005 (information from retrieved excerpts is limited)

S-R, A-G, R-L, F-L, T-P, R-1, R-2, R-C, MUBST, C-1, C-2, I-1, I-2, P-I, O-S, P-F: Not found in retrieved materials (use permissions and dimensional standards). Verify with the jurisdiction or see the official ordinance for district chapters (§ 20.040.005 lists each district) .

Coastal and community plan districts (Divisions II/III) — unincorporated areas inside the Coastal Zone

These districts apply only within the Coastal Zone and specified community plan areas.

Mendocino Town Plan districts

General rule for allowed uses: In the unincorporated Town of Mendocino, only uses listed as permitted or conditional in the base/combining district are allowed (§ 20.604.025 ).
Combining overlay for visitor lodging: The Mendocino Visitor-Serving Facilities Combining District (“*/*B”) allows designated inns and B&Bs as permitted in addition to the base district’s principal use (§ 20.684.010–.025 ).

MSR — Mendocino Suburban Residential

Permitted: Single-family; community gardens/open space; conditional: minor utilities, cottage industries, and single-unit rentals (§ 20.648.010–.015 ).
Key standards: Minimum lot 20,000 sf; front/rear 20 ft; sides 6 ft; max height 28 ft (§ 20.648.020–.040 ).

MRM — Mendocino Residential Multi-Family

Conditional: small schools, lodges/assembly, minor/major utilities, cottage industries; single-unit rentals (§ 20.656.015 ).
Key standards: Minimum lot 12,000 sf; density steps by lot area (e.g., 1 unit/6,000 sf for first unit; subsequent units per § 20.656.025); front/rear 20 ft; sides 6 ft; max height 28 ft (§ 20.656.020–.045 ).

MC — Mendocino Commercial

Permitted: Small-format offices, personal services, limited retail; residential (single-, two-, and three-family) as permitted uses; Mendocino visitor-serving facilities on parcels designated with “*/*B” (§ 20.664.005–.010 ).
Key standards: Height limit 28 ft (with historic/context limits/variances); specialized parking flexibilities in historic zones (§ 20.664.050–.055; variances § 20.724 referenced) .

Gualala Town Plan districts

GVMU — Gualala Village Mixed Use: Height 28 ft east of Hwy 1; 18 ft west of Hwy 1 unless view corridors justify 28 ft; lot coverage 20–25%; FAR 0.20–0.35; centerline setbacks on Hwy 1/local roads apply (§ 20.405.035–.065 ).
GHMU — Gualala Highway Mixed Use: Residential densities up to 25 du/ac for multi-family; visitor accommodations up to 15 units/ac; coverage 20%; commercial FAR 0.30; Hwy 1 setbacks and landscaping buffers required (§ 20.406.025–.050 ).
GPD — Gualala Planned Development: At least 50% of site for residential and 10% for visitor-serving; height 28 ft; usable activity space minimums and coastal resource protections apply (§ 20.407.025–.050 ).
GI — Gualala Industrial: Industrial is the principal permitted use; limited civic/commercial/open space allowed; some uses require coastal development use permits (§ 20.407A.010–.015 ).

Coastal Open Space (OS)

Permitted/conditional uses include caretaker housing, community recreation, selected visitor accommodations (e.g., campgrounds), and agriculture; density 1 caretaker dwelling/10 acres; fronts/rears 50 ft; sides 20 ft; height 16 ft (§ 20.372.015–.040 ).

Cross-cutting topics that affect land use

Design and historic review: Town of Mendocino districts repeatedly reference Historic Preservation and variances (e.g., § 20.656.045; § 20.664.050). Use the Mendocino County Design Review and Mendocino County Historic Preservation pages for process context (code cites include § 20.760 references in the district chapters) .
Overlays/combining districts: Visitor-Serving (*/*B) overlay in the Mendocino Town Plan modifies permitted lodging uses; other coastal overlays (e.g., Highly Scenic Areas) adjust siting and height outcomes (§ 20.684.010–.025; § 20.504.020) . See Overlay Districts.
Parking: Districts often cross-reference countywide parking standards; some community plan districts have their own ratios or flexibilities (§ 20.405.055–.060; § 20.664.055) . See Mendocino County Parking.
Mixed-use compatibility: MU-2/MUNS require separation and screening between residential and non-residential uses; agricultural adjacency triggers larger buffers and fencing (§ 20.085.055; § 20.087.055(A)(2)(c) ).
ADUs/housing overlays: Coastal ADU siting is constrained in agriculture/timber and scenic areas (§ 20.458.050 and cross-references); see California ADU law and California housing laws for state-level allowances, and confirm local coastal standards for ADUs where applicable (§ 20.458.050; coastal ADU protections §§ 20.496, 20.500 cited in ADU chapter) .

Snapshot: selected districts and standards

District	Principal permitted uses (examples)	Conditional uses (examples)	Selected dimensional standards	Code Reference
R-R (Rural Residential)	Family Residential; some Cottage Industries	Cluster development; limited lodging; winery; mining	Lot: 40,000 sf–10 ac; Front/Rear: 20–50 ft	§ 20.048.010–.035
U-R (Upland Residential)	Single-family; limited civic/commercial by admin permit	Cluster dev.; resort/recreation; winery; mining	Lot: 20–40 ac; Density: 1/20–1/40 ac; Front/Rear: 50 ft	§ 20.056.015–.035
R-3 (Multiple-Family)	Single- and two-family; dwelling groups (admin permit)	Mobile home park; schools; indoor rec; limited lodging	With water/sewer: MF up to 1/1,500 sf; Front/Rear: 20 ft	§ 20.080.015–.035
MU-2 (Mixed Use 2)	Residential + commercial mix	Projects inconsistent with compatibility standards	Height 50 ft; FAR 0.3–1.0 (non-res.); density up to 1/1,500 sf	§ 20.085.025–.055
MUNS (North State St.)	Mixed residential/commercial	Discretionary if not meeting standards	300-ft res–industrial separation; 50-ft ag buffer fence	§ 20.087.055(A)(2)
MSR (Mendocino Suburban Res.)	Single-family; community gardens/open space	Minor utilities; cottage industries; single-unit rentals	Lot 20,000 sf; Front/Rear 20 ft; Sides 6 ft; Height 28 ft	§ 20.648.010–.040
MRM (Mendocino Multi-Family)	Multi-unit by lot area thresholds	Schools; lodges/assembly; utilities; cottage industries	Lot 12,000 sf; density per § 20.656.025; Height 28 ft	§ 20.656.015–.045
MC (Mendocino Commercial)	Offices/services/retail (≤1,000 sf); residential; existing inns/B&Bs with /B	Larger/commercial uses per chapter	Height 28 ft; historic/design limits apply	§ 20.664.010; .050–.055
GVMU (Gualala Village MU)	Mixed-use	As allowed by plan	West of Hwy 1: Height 18–28 ft; coverage 20–25%; view corridors	§ 20.405.035–.050
OS (Coastal Open Space)	Passive rec., limited ag; caretaker housing (cond.)	Campgrounds/hostels; community rec.; utilities (cond.)	Density 1 caretaker/10 ac; Front/Rear 50 ft; Height 16 ft	§ 20.372.015–.040

Note: Cannabis facility and cultivation permissions add a separate layer—see § 20.242.010–.040 (inland) for which districts and permit types apply (Tables 1–2) .

Checklist

Confirm your parcel is in unincorporated Mendocino County and whether it’s inland or in the Coastal Zone (§ 20.004.030; community plan citations for Mendocino/Gualala) .
Identify the base zoning district from the official County zoning map, then find the corresponding chapter (start with § 20.040.005 list) .
Determine if any combining/overlay districts apply (e.g., Mendocino Visitor-Serving */*B, Highly Scenic Areas) and how they modify uses/standards (§ 20.684.010–.025; § 20.504.020) . See Overlay Districts.
Verify the use type classification (Residential/Civic/Commercial/etc.) that matches your proposal and whether it’s permitted, requires an Administrative Permit, or a Use Permit (e.g., R-3 § 20.080.015–.020) .
Check the dimensional standards (lot size, density, setbacks, height, FAR) for your district, and any plan-specific standards (e.g., Gualala view corridors) (§§ cited above; Gualala § 20.405.035–.050) .
Review cross-cutting requirements like parking, design review, and historic preservation where applicable (e.g., Mendocino Historic Preservation references in district chapters) .
If proposing cannabis uses, confirm district eligibility and permit type under Chapter 20.242 and any facility rules in Chapter 20.243 (Tables 1–2) .
For ADU/JADU concepts, check local coastal ADU constraints and state law linkage; then see California ADU law. Coastal ADUs have additional siting limits (§ 20.458.050 and related standards) .

Risks & Ambiguities

Issue	Why it matters	What to verify
Inland vs. Coastal applicability	Different divisions of Title 20 apply; standards can diverge	Whether your parcel is regulated by Division I (inland) or the Coastal Zoning Code; see § 20.004.030 and community plan maps
Mixed-use separation buffers	MU districts require specified separation/landscaping between uses	Required separation distances and agricultural-edge buffers in § 20.085.055 or § 20.087.055(A)(2)
Utility service affects density	Some residential densities hinge on water/sewer availability	R-3 density tables by utility status (§ 20.080.025–.030)
Historic/design constraints	Town of Mendocino districts limit height/parking and require design fit	Chapter references to Historic Preservation and variances (e.g., § 20.656.045; § 20.664.050–.055)
Cannabis overlay rules	Cannabis is allowed only where Chapter 20.242/20.243 say so	The correct table row for your zoning and license type (§ 20.242.040; § 20.243.070+)
Visitor-serving combining in Mendocino	Lodging allowed only on mapped “/B” parcels	Whether your parcel carries the * or *B symbol; see § 20.684.010–.025

Plain-English Summary

In unincorporated Mendocino County, what you can do with land depends on your zoning district and (if you’re in the Coastal Zone) your community plan. Each district lists the uses allowed outright, those needing an administrative or full use permit, and the lot size, setbacks, height, and density rules. Overlays like Mendocino’s visitor-serving “*/*B” and Gualala’s scenic/view-corridor rules can further shape what’s allowed. If it isn’t listed for your district—or it conflicts with a combining district—it’s not allowed.

Information Gaps

Detailed permitted/conditional uses and dimensional standards for inland districts S-R, A-G, R-L, F-L, T-P, R-1, R-2, R-C, MUBST, C-1, C-2, I-1, I-2, P-I, O-S, P-F were not found in the retrieved materials. Verify with the jurisdiction.
Inland Open Space (O-S) specifics were not retrieved; coastal OS standards are provided (§ 20.372.015–.040).

Source References

Inland applicability, purpose, effect of plan: § 20.004.010–.045 (Title, Intent, Applicability, Effect)
Inland districts list: § 20.040.005 (districts established)
R-R standards: § 20.048.010–.035
U-R standards: § 20.056.015–.035
R-3 standards: § 20.080.015–.035
MU-2 standards: § 20.085.025–.055
MUNS standards: § 20.087.045–.055 (compatibility: § 20.087.055)
Cannabis cultivation/facilities: § 20.242.010–.040 (Tables 1–2); § 20.243.040–.090
Mendocino Town Plan—effect and use framework: § 20.604.025; MSR § 20.648.010–.040; MRM § 20.656.015–.045; MC § 20.664.005–.055; Visitor-Serving */*B § 20.684.010–.025
Gualala Town Plan—GVMU § 20.405.035–.065; GHMU § 20.406.025–.050; GPD § 20.407.025–.050; GI § 20.407A.005–.015
Coastal OS: § 20.372.015–.040

Sources

Retrieved passages

Mendocino County Zoning Code (§ 2) High relevance
Mendocino County Zoning Code (Title 20) High relevance
Mendocino County Zoning Code (Chapter 20.716) High relevance
Mendocino County Zoning Code (§ 2) High relevance
Mendocino County Zoning Code (§ 2) Medium relevance
Mendocino County Zoning Code (Title 20) Medium relevance
Mendocino County Zoning Code (Section 20.532.100) Medium relevance
Mendocino County Zoning Code (Chapter 20.496.) Medium relevance
Mendocino County Zoning Code Medium relevance
Mendocino County Zoning Code (§ 20) Medium relevance
Mendocino County Zoning Code (chapter of) Medium relevance
Mendocino County Zoning Code (Chapter 20.016) Medium relevance
Mendocino County Zoning Code (Chapter 20.016) Medium relevance
Mendocino County Zoning Code (Chapter 20.760.) Medium relevance
Mendocino County Zoning Code (Chapter 20.032) Medium relevance

Cited sections

Inland applicability, purpose, effect of plan: § 20.004.010–.045 (Title, Intent, Applicability, Effect) (§ 20.004.010)
Inland districts list: § 20.040.005 (districts established) (§ 20.040.005)
R-R standards: § 20.048.010–.035 (§ 20.048.010)
U-R standards: § 20.056.015–.035 (§ 20.056.015)
R-3 standards: § 20.080.015–.035 (§ 20.080.015)
MU-2 standards: § 20.085.025–.055 (§ 20.085.025)
MUNS standards: § 20.087.045–.055 (compatibility: § 20.087.055) (§ 20.087.045)
Cannabis cultivation/facilities: § 20.242.010–.040 (Tables 1–2); § 20.243.040–.090 (§ 20.242.010)
Mendocino Town Plan—effect and use framework: § 20.604.025; MSR § 20.648.010–.040; MRM § 20.656.015–.045; MC § 20.664.005–.055; Visitor-Serving */*B § 20.684.010–.025 (§ 20.604.025)
Gualala Town Plan—GVMU § 20.405.035–.065; GHMU § 20.406.025–.050; GPD § 20.407.025–.050; GI § 20.407A.005–.015 (§ 20.405.035)
Coastal OS: § 20.372.015–.040 (§ 20.372.015)
MendocinoCounty_ZoningCode.md

Official Mendocino County code library

Frequently asked questions

What can I build on an R-R lot in unincorporated Mendocino County?

R-R (Rural Residential) primarily supports single-family residential and small-scale rural uses. Clustered housing, limited lodging, wineries, and some recreation uses may be possible with a Use Permit. Minimum lot sizes run from 40,000 sf to 10 acres, and setbacks scale up with the lot size tier (§ 20.048.010–.035) .

Are duplexes or multi-family units allowed in R-3?

Yes. In R-3, single- and two-family are typically allowed with an Administrative Permit, and higher-density forms can be approved depending on utilities. With water and sewer, multi-family density can be up to 1 unit per 1,500 sf; without them, multi-family is not allowed (§ 20.080.015–.030) .

Do I need design or historic review in the Town of Mendocino?

Many Mendocino Town Plan districts reference Historic Preservation provisions and may require design/historic review. The MC and MRM chapters include height and setback exceptions tied to Historic Preservation procedures; confirm review triggers before applying (§ 20.656.040–.045; § 20.664.050–.055) .

Can I run a small business or cottage industry from a rural home?

Cottage industries are allowed in several rural districts (often by permit). In R-R, certain cottage industries are recognized, and others may require a Use Permit depending on scale and impacts. Check your exact R-R tier and chapter tables (§ 20.048.010–.020) .

Is cannabis cultivation allowed on my property?

Only where Chapter 20.242 allows it and with the correct zoning clearance or administrative permit for your zoning and license type. Tables 1–2 identify which license types may be allowed in districts like R-R, A-G, U-R, and industrial zones (§ 20.242.040; § 20.242.070) .

What are the key height and view rules in Gualala?

West of Highway 1, the Gualala Village Mixed Use (GVMU) district caps many buildings at 18 ft unless significant view corridors are provided; there are lot coverage and FAR caps and corridor/setback metrics. East of Highway 1, height is typically 28 ft (§ 20.405.035–.045) .

How do mixed-use standards affect my project in MU-2 or MUNS?

These districts require compatibility measures: minimum separation from industrial uses, landscape buffers next to agriculture, and undergrounding/utilities standards. Projects inconsistent with the standards may shift to discretionary review (§ 20.085.055; § 20.087.055) .

Are visitor-serving uses allowed anywhere in the Town of Mendocino?

Only on parcels mapped with the “*/*B” overlay (Visitor-Serving Facilities Combining District), in addition to base district allowances. Hotels/inns and B&Bs correspond to the overlay designation (§ 20.684.010–.025) .

What setbacks apply to U-R (Upland Residential)?

Front and rear setbacks are 50 ft, with large minimum lot sizes (20 or 40 acres) and matching densities. Some resort/recreation or winery uses may be allowed with a Use Permit (§ 20.056.020; § 20.056.025–.035) .

Do the inland rules apply inside the Coastal Zone?

No. Division I expressly excludes the Coastal Zone. Coastal parcels follow the Coastal Zoning Code and any applicable community plan (e.g., Mendocino Town Plan, Gualala) (§ 20.004.030; § 20.604.025) .

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