Alpine County Zoning, Planning & Building Codes

Last reviewed: July 6, 2026

Overview

Alpine County regulates land use in its unincorporated areas through its zoning ordinance, codified as Title 18 of the County Code. The ordinance states it applies to “all lands” in the county’s unincorporated areas and must remain aligned with the County General Plan (§ 18.04.040; § 18.04.060) . The code is organized around base zoning districts (agricultural, residential, commercial, industrial, institutional), combined/overlay districts (e.g., scenic highways, Markleeville Historic District), and countywide standards (height, yards, parking) that apply across districts (§ 18.68.010; § 18.68.050; § 18.68.100; § 18.68.140) . Development may proceed by conventional subdivision or via a [planned development] approach that clusters homes and preserves open space (§ 18.04.070; § 18.28.010) .

The single most important orientation: the Alpine County Zoning Ordinance (Title 18) governs development only in the unincorporated areas, and it must be kept in conformance with the General Plan (§ 18.04.040; § 18.04.060) .

How Alpine County’s code is organized

• Title: The ordinance is cited as the “Zoning Ordinance of the County of Alpine” (§ 18.04.010) . It applies to all lands in the county’s unincorporated areas (§ 18.04.040) .
• General Plan linkage: Zoning decisions must maintain conformance with the General Plan; the county may enforce lower interim densities until conditions warrant more intense development (§ 18.04.060) .
• How to navigate districts: Official zoning maps are maintained by the County and updated when zone changes are adopted (§ 18.12.070; § 18.12.080) . Base districts are each in their own chapters (e.g., AG § 18.16; RE § 18.32; RN § 18.36; NC § 18.40; C § 18.44; IND § 18.48; INS § 18.52), with combined/overlay districts in separate chapters like MHD (Markleeville Historic District, § 18.56), Scenic Highways (§ 18.60), and —CR Commercial Recreation Combined (§ 18.64) .
• Countywide rules: General requirements and exceptions apply across districts, including height, parking, and yards (§ 18.68.050; § 18.68.100; § 18.68.140) . Standards for “secondary dwelling units” (local ADUs) are in Chapter 18.69 (§ 18.69.010–.040) .
• Procedures: Variances and appeals are in Chapter 18.80 (§ 18.80.040–.050), while amendments/zone changes are in Chapter 18.84 (§ 18.84.010–.060) . A Bear Valley area fee for secondary dwelling units is codified in Chapter 18.87 (§ 18.87.010, § 18.87.040) .

Zoning district families

Below is a practical orientation to Alpine County’s base districts and combined/overlays. For detailed permitted/conditional uses and dimensional standards, see the cited sections.

• Agricultural and resource districts

  • AG Agriculture: Working lands with broad agricultural uses; minimum 20 acres, 30 ft front/side/rear yards (§ 18.16.010; § 18.16.040) . Certain processing, mining, and energy uses require a conditional use permit (§ 18.16.030) .
  • AP Agricultural Preserve: Williamson Act–compatible preserve; generally strict agricultural focus, e.g., one SFD per 100 acres; must also meet countywide standards in Chapter 18.68 (§ 18.18.010; § 18.18.020; § 18.18.070) .
  • LP Land Preserve: Open space conservation with limited, resource-based uses; some activities allowed by use permit when consistent with preservation intent (§ 18.20.010–.030) .
  • TP Timber Preserve: Managed timberlands with very limited residential allowances; certain forest-product and utility uses may be conditional (§ 18.24.030) .

• Residential districts

  • RE Residential Estate: Low-density, mini‑ranch character; parcel size is set case‑by‑case or via a suffix (e.g., RE‑10); 30 ft front/side/rear yards (§ 18.32.010; § 18.32.040) .
  • RN Residential Neighborhood: Urban/suburban neighborhoods to a base density “not to exceed” 4 du/acre unless a use permit and appropriate RH GP designation allow more; multi‑family up to 15 du/acre with a use permit; typical yards: 30 ft front, 20 ft interior side, 30 ft street side, 20 ft rear; 80 ft lot width (§ 18.36.010; § 18.36.030(D); § 18.36.040) .

• Commercial and employment districts

  • NC Neighborhood Commercial: Local‑serving retail; minimum lot 10,000 sf; 30 ft front and rear; sides vary with adjacency; height per general height rules (§ 18.40.040–.070) .
  • C Commercial: Community commercial; 45 ft or three stories max height; yards: 6 ft front, no sides/rear unless abutting an R district (§ 18.44.050–.060) .
  • IND Industrial: General industrial; many commercial/manufacturing uses permitted; height up to 45 ft (§ 18.48.020; § 18.48.050) .

• Civic and planned districts

  • INS Institutional: Public facilities; typical yards: 30 ft front, 20 ft sides/rear; 50 ft max height unless next to an R zone (§ 18.52.040–.050) .
  • PD Planned Development: Requires an approved comprehensive development plan; allows clustering and tailored standards if overall plan objectives are met (§ 18.28.010; § 18.28.050) .

• Combined/overlay districts (see overlay districts)

  • MHD Markleeville Historic District (combined): Adds design standards and review to protect historic character; includes a design review committee and procedures (§ 18.56.070–.090) .
  • Scenic Highway Corridor: Applies to areas visible from designated scenic corridors; includes prohibitions and design guidelines to protect scenic resources (§ 18.60.010–.040) .
  • —CR Commercial Recreation (combined): Adds recreation‑oriented uses; base‑zone standards still govern area/yard/height unless modified by permit (§ 18.64.020; § 18.64.040–.050) .

Citywide development standards

Alpine County sets both countywide and district‑specific standards. Key highlights:

• Heights (countywide baseline)

  • For most non‑commercial/industrial/institutional buildings, maximum height varies by slope and location: on the East Slope, 34–36 ft (depending on lot slope); on the West Slope, 36–40 ft; accessory buildings: 25 ft. Heights above these baselines require a variance, with one foot of extra setback per one foot of extra height (§ 18.68.050) .
  • District‑specific caps: C up to 45 ft (§ 18.44.050) ; IND up to 45 ft (§ 18.48.050) ; INS up to 50 ft unless abutting residential (§ 18.52.050) .

• Setbacks and parcel size (examples)

  • AG: 20 acres minimum; 30 ft front/side/rear (§ 18.16.040) .
  • RE: Minimum parcel size set case‑by‑case or via suffix (e.g., RE‑10); 30 ft front/side/rear (§ 18.32.040) .
  • RN: Minimum parcel size set case‑by‑case or via suffix (e.g., RN‑30=30,000 sf); 30 ft front, 20 ft interior side, 30 ft street side, 20 ft rear (§ 18.36.040) .
  • NC: 10,000 sf min lot; 30 ft front; sides none unless near R, otherwise 30 ft; 30 ft rear (§ 18.40.040) .
  • C: 5,000 sf min lot; 6 ft front; sides/rear none unless abutting R (§ 18.44.060) .

• Yard rules and encroachments (countywide)

  • Sight triangles at corners must remain clear; various encroachments are allowed in yards (e.g., eaves by 2 ft; porches/stairs by 6 ft; RE/RN fence heights 6 ft side/rear, 4.5 ft front) (§ 18.68.140) .

• Parking

  • Off‑street parking standards are set in § 18.68.100 and cross‑referenced in multiple districts (§ 18.44.070; § 18.40.070; § 18.52.060; § 18.18.070) . Check both the countywide ratios and any district‑specific conditions.

• FAR and lot coverage

  • Not found in retrieved materials. Verify with the jurisdiction if an FAR or lot‑coverage control applies countywide or by district.

Specific plans & overlays

• Planned Development (PD)
  • The PD district allows clustering on the least‑sensitive land while preserving the rest as open space; it requires a comprehensive development plan and may deviate from otherwise‑applicable height/yard standards if the plan justifies it (§ 18.28.010; § 18.28.050(A)) . Areas designated PD in the General Plan may not exceed 2.5 du/acre (§ 18.28.050(B)) . Before the first building permit, open‑space dedications must be recorded (§ 18.28.080(E)) , and a use permit is generally required prior to construction (§ 18.28.090(A)) . PD approvals expire if not activated within 24 months (extendable to 42 months) (§ 18.28.100) .
• Scenic Highway Corridor overlay
  • Applies wherever development is visible from designated scenic highway corridors; includes prohibited activities and design guidance to protect views (§ 18.60.010–.040) .
• Markleeville Historic District (MHD) combined zone
  • Establishes design guidelines, a design review committee, procedures, and dimensional controls in the Markleeville townsite; demolition of pre‑1940 structures requires an approved replacement plan, and permits are withheld until consistency is confirmed (§ 18.56.050; § 18.56.070–.100; § 18.56.120) .
• Commercial Recreation combined zone (—CR)
  • Adds recreation/tourist uses to a base district; base setbacks and heights apply unless modified through permit (§ 18.64.020; § 18.64.040–.050) .
• Bear Valley secondary dwelling unit impact fees
  • A countywide program for the Bear Valley Area imposes impact fees on secondary dwelling units; fees must be paid before permit issuance (§ 18.87.010; § 18.87.040) .

Building permits & review

• Typical path
  • Confirm the parcel’s zoning on the official map, then check permitted/conditional uses and development standards for the district. Many activities require a use permit when listed as conditional (e.g., multi‑family in RN to 15 du/acre, § 18.36.030(D)) .
  • Variances are granted by the Planning Commission upon findings; appeals go to the Board (§ 18.80.040–.050) . Zone changes follow public hearing procedures and trigger map updates (§ 18.84.030–.060; § 18.12.080) .
  • In the PD district, no building permit may issue unless the structure conforms to the approved development plan (§ 18.28.080(D)) . In the MHD, no permit may issue until design review compliance is confirmed (§ 18.56.120) .
• Home occupations
  • Allowed in any zone that allows residential use, subject to a permit and standards (§ 18.70.020; § 18.70.050) .
• Building code
  • Projects must also comply with the California Building Standards Code. The zoning code references the State Building Code in regulating certain activities (e.g., hazardous materials storage) and uses the California Building Code to define building areas (§ 18.68.040; § 18.69.040) .

State housing law in Alpine County

• ADUs and JADUs
  • Locally termed “secondary dwelling units,” ADUs require a permit and are listed as allowed (with a secondary dwelling unit permit) in AG, AP, TP, RE, RN, and PD where single‑family is allowed (§ 18.69.010; § 18.69.020; § 18.69.040(G)) . Note: Since 2020, state law preempts many local limits; at minimum, jurisdictions must allow an 800 sf ADU with 4 ft side/rear setbacks, streamline approvals, and follow updated height allowances set by statute (e.g., 16–18 ft for detached ADUs depending on context). See California ADU law for the current statewide standards (Gov. Code §§ 66321–66323) .
• Transitional and supportive housing
  • Integrated into residential and agricultural zones as permitted uses in Alpine County (e.g., AG, RE, RN) (§ 18.16.020; § 18.32.020; § 18.36.020) .
• SB 9 urban lot splits/duplex and density bonus
  • Not found in retrieved materials; consult California housing laws and verify with the County for any local implementation details or handouts.
• Rent stabilization
  • Not found in retrieved materials. Verify with the jurisdiction.

Source References

• Title and applicability; General Plan linkage: § 18.04.010; § 18.04.040; § 18.04.060; § 18.04.070
• Official maps; amendments/zone changes: § 18.12.070–.080; § 18.84.010–.060
• District chapters: AG § 18.16; AP § 18.18; LP § 18.20; TP § 18.24; RE § 18.32; RN § 18.36; NC § 18.40; C § 18.44; IND § 18.48; INS § 18.52; PD § 18.28; MHD § 18.56; Scenic § 18.60; —CR § 18.64; General reqs § 18.68; Secondary units § 18.69; Home occupations § 18.70
• Examples of standards: AG § 18.16.040; RE § 18.32.040; RN § 18.36.040; NC § 18.40.040; C § 18.44.050–.060; IND § 18.48.050; INS § 18.52.040–.050; countywide height/yard § 18.68.050; § 18.68.140; parking § 18.68.100 (and cross‑references)
• PD procedures and timing; MHD review; Scenic overlay; Bear Valley SDU fees: § 18.28.010–.100; § 18.56.070–.120; § 18.60.010–.040; § 18.87.010–.040
• State ADU law summary (2025): Gov. Code §§ 66321–66323 (2025 CA ADU Handbook)