Sierra County — Zoning

Last reviewed: July 6, 2026

Overview

Sierra County’s zoning rules apply only in the unincorporated areas and are codified in Title 15 Zoning of the Sierra County Code. The code divides all unincorporated land into base zoning districts and overlay/combining districts, shown on the official land use plan maps kept by the Planning Director; when uncertainty exists, the Board determines district boundaries (see the land use plan maps and boundary rules in § 15.12.020 and § 15.12.030). If a use is not listed as allowed in a district, it is prohibited unless the County makes a similar-use determination under the code’s “specified uses” rule (§ 15.12.050).

Plain-English rule: In unincorporated Sierra County, only uses the code lists as permitted or conditionally permitted are allowed; all others are prohibited unless the County approves them as “similar” to listed uses (§ 15.12.050).

Use this page with the Sierra County zoning & planning overview, plus related topics like Land Use, Development Standards, Parking, Design Review, Overlay Districts, Nonconforming Uses, Variances and Exceptions, and Signage. State rules like the California Building Standards Code and California ADU law may also apply.

How zoning works in Sierra County

• Districts established. Title 15 creates the base and overlay districts below (R‑1, R‑2, R‑3, CR, CN, CC, SHC, AV, IN, BP, A1, GF, FR, RR tiers, OS tiers, SC/SH, -FP, -SZ, OS, PD, X, CE, TPZ, SP, PS), as shown on the official maps in the Planning Director’s office (§ 15.12.010, § 15.12.020).
• Official maps and changes. The “Official Land Use Maps of the County of Sierra” control; amendments to zoning districts are codified, and “notes on subdivision maps” recorded after 2007 act as supplemental zoning regulations (§ 15.12.020, § 15.13, § 15.12.045).
• Overlay precedence. Overlays (e.g., scenic corridor, floodplain, stream zone) modify underlying zoning; where an overlay is stricter, the overlay controls (§ 15.12.280, § 15.12.282, § 15.12.284).

District-by-district guide (unincorporated areas)

Below is a plain-English snapshot of each district’s purpose, typical permitted/conditional uses, key dimensional standards, and notes on where it’s typically applied. Always confirm on the official maps and text.

R-1 residential one-family (§ 15.12.080)

• Purpose: Protect single-family areas.
• Typical permitted: One single-family dwelling; limited accessory uses. Conditional: public/quasi-public uses; communications equipment buildings.
• Key standards: 2 stories/35 ft; minimum lot 8,000–10,000 sf with public water; 1 acre if on well/septic; yards 20 ft front/5 ft side/25 ft rear; 1 off-street space per dwelling.
• Where: Platted residential neighborhoods in unincorporated communities (check map).

R-2 residential one- and two-family (§ 15.12.090)

• Purpose: Allow one-unit or duplex.
• Typical permitted: One single-family dwelling or one duplex per lot; similar accessory uses; conditional public/quasi-public.
• Key standards: Not found in retrieved materials (lot size/setbacks). Verify with the jurisdiction.

R-3 residential multiple-family (§ 15.12.100)

• Purpose: Provide multifamily rentals.
• Typical permitted: Multifamily; conditional: mobilehome parks, nursing homes, professional offices; boarding houses.
• Key standards: Main building up to 40 ft; min lot area per unit 2,000 sf; typical yards 20/5/20 ft; 1 parking space per unit.

CR commercial residential (§ 15.12.110)

• Purpose: Highway-oriented lodging/retail.
• Typical permitted: Motels/hotels, campgrounds, restaurants, service stations, recreation, retail for travelers. Conditional: animal hospitals, drive-ins, mobilehome parks.
• Key standards: 40 ft height; lot 12,000–24,000 sf with public water; yards 15/15/20 ft when abutting residential.
• Where: Highway corridors in unincorporated areas (check map).

CN neighborhood commercial (§ 15.12.120)

• Purpose: Convenience centers for neighborhoods or large rural/recreation areas (min zone area 2 ac).
• Typical permitted: Small retail, offices, restaurants/cafes; clubs/lodges. Conditional: auto service stations; certain on-premises signs.
• Key standards: 40 ft max; lots 12,000–24,000 sf (or 1 ac w/ well+septic); yards 10/0/10 ft (more next to residential).

CC community commercial (§ 15.12.130)

• Purpose: Stabilize/protect community business districts; applied to designated centers.
• Typical permitted: Stores/shops, offices, hotels/motels, auto sales/service, theaters; accessory living quarters; conditional: cabinet/printing shops, RV parks, concerts.
• Key standards: 2 stories/40 ft; lots 5,000–10,000 sf (or 1 ac w/ well+septic); yards none unless abutting residential.

SHC stateline highway commercial (§ 15.12.135)

• Purpose: Commercial near state line highway context.
• Key standards: Airport-style height planes defined (horizontal 150 ft; conical 20:1 up to 150 ft; transitional 7:1); residential structures 2 stories/35 ft unless conditioned by use permit.

AV airport district (§ 15.12.140)

• Purpose: Regulate airport uses and airspace hazards.
• Typical permitted: Airports/heliports and accessory paving. Conditional: hangars, fueling, lighting, towers, residences needed for operations.
• Key standards: Heights and hazards governed by approach zones; additional site plan conditions apply.

IN industrial (§ 15.12.150)

• Purpose: Heavier industrial/production and selected clean/light business park–type uses.
• Typical permitted: Many industrial uses require administrative or full special use permits (e.g., freight terminals, biomass, batch plants, sawmills, rendering, recycling; plus caretaker’s quarters).
• Key standards: Not found in retrieved materials (dimensional). Verify with the jurisdiction.

BP business park combining (§ 15.12.155)

• Purpose: Overlay/combining for cleaner, quiet, employment uses with tailored performance standards; not for housing.
• Typical permitted: Offices, R&D, warehousing, small-scale fabrication, day care, fitness, limited retail for employees (hazardous materials limitations).

A1 agricultural (§ 15.12.160)

• Purpose/uses/standards: Not found in retrieved materials; the district is established in § 15.12.010 and referenced in amendments. Verify permitted uses (crop, animal, accessory dwellings), minimum parcel sizes, and setbacks in § 15.12.160 and the official map.

GF general forest (§ 15.12.170)

• Purpose/uses/standards: Not found in retrieved materials; district is established in § 15.12.010 and widely mapped by amendment. Verify permitted forestry uses and any residential limits in § 15.12.170.

FR forest recreation (§ 15.12.180)

• Purpose: Low‑intensity commercial recreation supportive of tourism in forest areas.
• Typical permitted (via use permit): Resort hotels, cabins, parks, trails, public campgrounds, golf, restaurants, small gift shops.
• Key standards: 2 stories/35 ft; typical yards 50 ft from local street centerline, 10 ft side, 20 ft rear.

RR-1 rural residential (§ 15.12.190)

• Purpose: Low-density residential near communities.
• Typical permitted: One single-family dwelling and customary accessory. Conditional: a second unit per County rules.
• Key standards: Min parcel 1 ac; 2 stories/35 ft; setbacks: front 60 ft from road centerline or 35 ft from property line (whichever greater), sides 15 ft, rear 30 ft; 1 off-street space per unit.

RR 1.5 rural residential (§ 15.12.195)

• Typical permitted: Single-family homes and accessory uses; conditional schools, stables/kennels.
• Key standards: Density/lot 1.5 ac; 2 stories/35 ft; 30/15/30 ft setbacks; 2 off-street spaces.

RR-2 rural residential (§ 15.12.200)

• Typical permitted: Single-family with use permit framework for mobiles; accessory structures.
• Key standards: 1 dwelling per 2 ac; 2 stories/35 ft; front 60 ft from road centerline, sides/rear 30 ft; 1 off-street space.

RR 2.5 rural residential (§ 15.12.205)

• Typical permitted: Single-family and accessory; conditional schools/kennels.
• Key standards: 1 per 2.5 ac; 2.5‑story/35 ft; 30/15/30 ft setbacks; 2 off-street spaces.

RR-4 rural residential (§ 15.12.210)

• Key standards: 1 per 4 ac; 2 stories/35 ft; front 60 ft from road centerline; sides/rear 30 ft; 1 off-street space.

RR-5 rural residential (§ 15.12.220)

• Key standards: 1 per 5 ac; 2 stories/35 ft; front 60 ft from road centerline; sides/rear 30 ft; 1 off-street space.

RR-10 rural residential (§ 15.12.225)

• Key standards: 1 per 10 ac; 2.5‑story/35 ft; 60 ft yards all sides; 2 off‑street spaces.

OS-20 open space residential (§ 15.12.230)

• Purpose: Very low-intensity large-lot single-family, protecting forests/ag lands; often within A1 or GF.
• Key standards: 1 per 20 ac; 2 stories/35 ft; front 100 ft from road centerline; sides/rear 60 ft.

OS-40 open space residential (§ 15.12.240)

• Key standards: 1 per 40 ac; 2 stories/35 ft; front 100 ft from road centerline; sides/rear 60 ft.

OS-60 open space residential (§ 15.12.250)

• Key standards: 1 per 60 ac; 2 stories/35 ft; front 100 ft from road centerline; sides/rear 60 ft.

OS-80 open space residential (§ 15.12.260)

• Key standards: 1 per 80 ac; 2 stories/35 ft; front 100 ft from road centerline; sides/rear 60 ft.

OS-160 open space residential (§ 15.12.270)

• Key standards: 1 per 160 ac; 2 stories/35 ft; front 100 ft from road centerline; sides/rear 60 ft.

OS open space district (§ 15.12.286)

• Purpose/standards: Not found in retrieved materials (referenced by the stream/OS cross-references). Verify with the jurisdiction.

SC/SH scenic highway corridor/Scenic Highway (§ 15.12.280)

• Purpose: Protect scenic quality along designated highways; overlay modifies base district. Off-site signs are not allowed; site plan approval by the Planning Commission is generally required (exceptions for one- and two-family dwellings).

-FP floodplain overlay (§ 15.12.282)

• Purpose: Apply FEMA 100‑year floodplain constraints; requires site plan per water setback submittal list; prohibits new schools/hospitals/public safety buildings; must also comply with Title 32 Floodplains.

-SZ stream zone overlay (§ 15.12.284)

• Purpose: Protect riparian corridors and meadows; overlay modifies base uses with a tailored list. Some low‑intensity uses are permitted; most new structural uses need a use permit and must meet water-resource setbacks with potential reductions under strict findings. Site plan review is required.

PD planned development (§ 15.12.290)

• Purpose: Custom, mapped PD with a concurrent use permit and precise plans; may later be refined via SP combining district.

X overlay (§ 15.12.295)

• Purpose: Protect lands (often outside community areas) for resource industries and rural character. Special conditions include: no further division; rezoning out of X requires public-interest findings and must avoid growth inducement/discontiguous patterns.

CE community expansion (§ 15.12.300)

• Purpose: Overlay to guide orderly growth near communities; minimum lot area 10 acres; uses per underlying district.

TPZ timberland production zone (§ 15.12.310)

• Purpose: Keep timberlands available for timber production; discourage conversion/urban service expansion.
• Typical permitted: Timber growing/harvest, grazing, reforestation, certain recreation (without permanent structures), single-family dwelling necessary for management on parcels ≥80 acres; many utility/processing activities require a special use permit. Residential structures must meet 100‑ft setbacks from all property lines and 35‑ft height (two stories).

SP site performance combining (§ 15.12.330)

• Purpose: Tailor use and development standards for unique/sensitive sites; applied as a “–SP (#)” suffix to base zoning, with custom standards adopted by ordinance.

PS public service (§ 15.12.340)

• Purpose: Public/quasi‑public facilities; permitted passive recreation, timber management, minor utilities; broad public uses allowed with special use permits; development standards include 20‑ft yards and 35‑ft max height.

Countywide rules that frequently affect zoning outcomes

• Water resource setbacks (§ 15.12.060). Applies to lakes, streams, wetlands, swales, springs, meadows, etc.; requires mapped setbacks and a site plan with detailed submittals; allows reduced setbacks under strict findings (e.g., up to 50% reduction, not less than 50 ft outside community areas; up to 50% reduction, not less than 25 ft in certain communities). Use overlays’ procedures if also in -SZ/-FP/OS.
• Groundwater transport (§ 15.12.065). Special use permit required in all districts (with limited exceptions).
• Variances. See Variances and Exceptions; parcel-specific variances and rezones are cataloged (e.g., § 15.44.040).

Quick reference: selected residential/rural standards (unincorporated areas)

Notes: “road CL” = measured from road centerline where stated by code; confirm exact measuring points in Development Standards and § citations above.

Checklist

• Confirm your parcel’s base zoning and overlays on the official land use plan maps in the Planning Director’s office (§ 15.12.020).
• Read your base district’s permitted and conditional uses; if not listed, assume prohibited unless approved as a similar use (§ 15.12.050).
• Screen for overlays: scenic corridor (SC/SH), floodplain (-FP), stream zone (-SZ), X or CE. Overlays can require a design review-style site plan and findings (§ 15.12.280, § 15.12.282, § 15.12.284).
• If near lakes/streams/wetlands/meadows, prepare the water-setback site plan and address BMPs (see submittal list in § 15.12.060(F)).
• Check Parking ratios for your use; the code often requires at least one space per unit (see district standards).
• If proposing industrial or complex commercial uses, determine if an administrative or full special use permit is needed in IN or BP (§ 15.12.150, § 15.12.155).
• For timberlands, verify TPZ eligibility, the 80‑acre SFD rule, and 100‑ft setbacks (§ 15.12.310).
• Confirm any “notes on subdivision maps” affecting the parcel (§ 15.12.045).
• If standards can’t be met, consider a Variance (see also parcel-specific actions like § 15.44.040).

Risks & Ambiguities

Plain-English Summary

In unincorporated Sierra County, your allowed uses and basic building envelope come from your base zoning district, then any overlays adjust the rules. Start by confirming your zoning on the official map, check for overlays like scenic corridor, floodplain, or stream zones, and then match your project to the listed permitted or conditional uses. If something isn’t listed, assume it’s not allowed unless you secure the right approval.

Source References

• Title 15 Zoning: districts established and official maps — § 15.12.010, § 15.12.020, § 15.12.030
• Specified uses rule — § 15.12.050
• Water resource setbacks and site plan submittals — § 15.12.060(F) and related
• R‑1 — § 15.12.080; R‑2 — § 15.12.090; R‑3 — § 15.12.100
• CR — § 15.12.110; CN — § 15.12.120; CC — § 15.12.130; SHC — § 15.12.135; AV — § 15.12.140; IN — § 15.12.150; BP — § 15.12.155
• A1 — § 15.12.160 (Not found in retrieved materials); GF — § 15.12.170 (Not found in retrieved materials)
• FR — § 15.12.180; RR‑1 — § 15.12.190; RR 1.5 — § 15.12.195; RR‑2 — § 15.12.200; RR 2.5 — § 15.12.205; RR‑4 — § 15.12.210; RR‑5 — § 15.12.220; RR‑10 — § 15.12.225
• OS‑20 — § 15.12.230; OS‑40 — § 15.12.240; OS‑60 — § 15.12.250; OS‑80 — § 15.12.260; OS‑160 — § 15.12.270; OS (open space) — § 15.12.286 (Not found)
• SC/SH scenic corridor — § 15.12.280; -FP floodplain — § 15.12.282; -SZ stream zone — § 15.12.284
• PD — § 15.12.290; X — § 15.12.295; CE — § 15.12.300; TPZ — § 15.12.310; SP — § 15.12.330; PS — § 15.12.340
• Groundwater transport — § 15.12.065; Subdivision map notes — § 15.12.045; Parcel-specific actions — § 15.44.040

Information Gaps

• Detailed permitted uses, lot size, and yard standards for the A1 and GF districts — Not found in retrieved materials.
• Complete “base” water resource setback distances in § 15.12.060(C) — Not found in retrieved materials.
• Full text for OS district (§ 15.12.286) dimensional standards — Not found in retrieved materials.

Retrieved passages

• Sierra County Zoning Code (Title 15) High relevance show source text
• CBC § 1146 (Title 15) High relevance show source text
• Sierra County Zoning Code (§ 86190.50) High relevance show source text
• CBC § 060 (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Section 33) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• CBC § 282 (Title 15) High relevance show source text
• CBC § 060 (Title 32.) High relevance show source text
• Sierra County Zoning Code (section shall) High relevance show source text
• Sierra County Zoning Code (section when) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (§ 15.12.310) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (Title 15) High relevance show source text
• Sierra County Zoning Code (§ 86190.20) High relevance show source text
• CBC § 4290 (Title 15) High relevance show source text

Cited sections

• Title 15 Zoning: districts established and official maps — § 15.12.010, § 15.12.020, § 15.12.030 (Title 15)
• Specified uses rule — § 15.12.050 (§ 15.12.050)
• Water resource setbacks and site plan submittals — § 15.12.060(F) and related (§ 15.12.060)
• R‑1 — § 15.12.080; R‑2 — § 15.12.090; R‑3 — § 15.12.100 (§ 15.12.080)
• CR — § 15.12.110; CN — § 15.12.120; CC — § 15.12.130; SHC — § 15.12.135; AV — § 15.12.140; IN — § 15.12.150; BP — § 15.12.155 (§ 15.12.110)
• A1 — § 15.12.160 (Not found in retrieved materials); GF — § 15.12.170 (Not found in retrieved materials) (§ 15.12.160)
• FR — § 15.12.180; RR‑1 — § 15.12.190; RR 1.5 — § 15.12.195; RR‑2 — § 15.12.200; RR 2.5 — § 15.12.205; RR‑4 — § 15.12.210; RR‑5 — § 15.12.220; RR‑10 — § 15.12.225 (§ 15.12.180)
• OS‑20 — § 15.12.230; OS‑40 — § 15.12.240; OS‑60 — § 15.12.250; OS‑80 — § 15.12.260; OS‑160 — § 15.12.270; OS (open space) — § 15.12.286 (Not found) (§ 15.12.230)
• SC/SH scenic corridor — § 15.12.280; -FP floodplain — § 15.12.282; -SZ stream zone — § 15.12.284 (§ 15.12.280)
• PD — § 15.12.290; X — § 15.12.295; CE — § 15.12.300; TPZ — § 15.12.310; SP — § 15.12.330; PS — § 15.12.340 (§ 15.12.290)
• Groundwater transport — § 15.12.065; Subdivision map notes — § 15.12.045; Parcel-specific actions — § 15.44.040 (§ 15.12.065)
• SierraCounty_ZoningCode.md