Inyo County — Overlay Districts

Last reviewed: July 6, 2026

Overview

This page explains how overlay and combining districts work in unincorporated Inyo County under Title 18 Zoning, and what they change on top of your base zoning. Overlays do not replace a parcel’s underlying district; they add extra rules, review steps, or incentives that control development, appearance, or eligibility for housing bonuses. For foundational context, see the county’s zoning & planning overview and the base-districts under Inyo County Zoning.

In unincorporated Inyo County, an overlay “rides on top” of the base zoning: the base district still controls permitted uses and standards unless the overlay says otherwise, and you must meet both sets of rules (§ 18.03.050; SAHO, DB, and “D” are identified overlay/combining districts in § 18.03.060).

The County’s zoning lists overlays and combining districts among its districts, including the SAHO snow avalanche hazard overlay and the D architectural design control combining district; the code also separately establishes the DB density bonus overlay and the Nongroundwater‑Neutral Agricultural Use Overlay for specific policy aims (§ 18.03.060; Chs. 18.64, 18.65, 18.67, 18.69).

All districts and boundaries are shown on the official county zoning map, which governs where overlays apply (§ 18.03.070).

District-by-district breakdown

SAHO — Snow Avalanche Hazard Overlay (Ch. 18.64)

• Purpose. To notify current and future property owners about potential snow‑avalanche hazards in designated areas (§ 18.64.010).
• Typical permitted uses. The same as the underlying base district; the overlay does not change use lists (§ 18.64.020).
• Key dimensional/operational standards.
  • All base-district standards still apply (§ 18.64.030).
  • Additional rule: avalanche‑protective/deflective structures or earthwork that would deflect avalanches toward other property or increase danger are prohibited (§ 18.64.050).
• Where it applies and mapping mechanics. Applied after acceptance of a qualified avalanche‑hazard study; the County mails notice to owners and records a notification within 60 days (§ 18.64.040). Removal/adjustment is possible by rezoning if a county‑approved expert report supports it (§ 18.64.060).

DB — Density Bonus Overlay (Ch. 18.65)

• Purpose. Implements the State Density Bonus Law to grant density bonuses and incentives/concessions for qualifying housing developments (§ 18.65.010, § 18.65.020).
• Typical permitted uses. Focused on “housing development” as defined by state law; the overlay does not itself change nonresidential use permissions (§ 18.65.040–.050).
• Key dimensional/operational standards.
  • The state program is adopted by reference; eligibility and bonus math follow Government Code §§ 65915–65918 (§ 18.65.020, § 18.65.050).
  • If zoning density conflicts with the County’s general plan land use density, the general plan prevails for DB purposes (§ 18.65.040).
• Where it applies. Any qualifying housing development in unincorporated areas; use your base zone plus DB rules. Coordinate DB submittals with your base‑district development standards and any applicable parking requirements.

Nongroundwater‑Neutral Agricultural Use Overlay (Ch. 18.67)

• Purpose. To regulate water use for agricultural activities in overdrafted groundwater basins via an overlay district (§ 18.67.010–.020).
• Typical permitted uses. Same uses as the combined underlying district (§ 18.67.030).
• Key dimensional/operational standards.
  • Underlying district standards still control (§ 18.67.040).
  • A conditional use permit is required before any agricultural use is conducted in this overlay (§ 18.67.050).
• Where it applies. On parcels the County places within the overlay in groundwater basins identified as in overdraft. Specific mapping criteria are not detailed in the retrieved text; Verify with the jurisdiction.

D — Architectural Design Control Combining District (Ch. 18.69)

• Purpose. A combining “D” district that may be added to any base zone to ensure harmonious architectural design, materials, and colors aligned with Inyo County’s high‑desert character (§ 18.69.010).
• Typical permitted uses. Your underlying district’s uses remain; the D district controls design, not whether a use is allowed (§ 18.69.030.B).
• Key dimensional/operational standards and review.
  • The County appoints a five‑member architectural design review board (§ 18.69.020).
  • Before issuing building, occupancy, or zoning use permits, plans must be submitted for design review; the planning commission evaluates design, site planning, screening of parking/storage, operational impacts, etc. (§ 18.69.030, § 18.69.050).
  • Approval is limited to design/location/color/operations; it does not negate uses permitted by‑right (§ 18.69.030.B).
• Where it applies. Only on mapped areas where “D” is combined with a base district (§ 18.03.060, § 18.03.070). Coordinate early with Inyo County Design Review.

PP — Precise Plan Combining District (Ch. 18.63)

• Purpose. A precise plan district is combined with a base district to lock in a site‑specific plan and standards (§ 18.63.030, § 18.63.050).
• Typical permitted uses. The same uses as the underlying district; precise plan approval can serve as the land use permit where one is required (§ 18.63.050).
• Key dimensional/operational standards.
  • Front/side/rear yards are as shown on the approved precise plan (§ 18.63.060). Lot area/width/depth and height follow the underlying district (§ 18.63.070–.080).
• Where it applies. Only where a PP overlay is mapped and a precise plan is approved; confirm your zoning map and any adopted precise plan (§ 18.03.070).

At‑a‑glance standards and approvals

Practical notes:

• Overlays are shown on the official zoning map maintained by the County; always confirm your parcel’s base district and every combining/overlay that applies (§ 18.03.060–.070).
• If an overlay constrains site design (e.g., SAHO or D), it can affect where you place buildings, parking, or signs; plan these coherently with development standards, signage, and parking.
• Existing legal nonconformities remain subject to county rules even when an overlay is added; review nonconforming uses before altering or expanding.
• If standards make strict compliance impractical, consult variances and exceptions. Design topics may also intersect with Inyo County Design Review.

Checklist

• Confirm the parcel is in unincorporated Inyo County and identify its base zoning and all mapped overlays/combining districts (§ 18.03.060–.070).
• For SAHO parcels: incorporate hazard constraints into site layout and avoid any avalanche‑deflecting works; verify recorded notice requirements (§ 18.64.040–.050).
• For DB projects: verify housing development eligibility, calculate bonuses per state law as adopted, and check general plan density consistency (§ 18.65.020, § 18.65.040–.050).
• For Nongroundwater‑Neutral Ag areas: obtain a conditional use permit before conducting agricultural uses (§ 18.67.050).
• For D areas: prepare the required design submittal (site plan, elevations, operations) for planning commission design review (§ 18.69.030, § 18.69.050).
• For PP areas: ensure your project matches the approved precise plan’s yard standards; seek modification if needed (§ 18.63.060; § 18.63.040).
• Cross‑check overlay requirements with base‑zone development standards, signage, and parking.
• If something doesn’t square with your site, ask about variances and exceptions; if the site is already nonconforming, review nonconforming uses.

Risks & Ambiguities

Plain-English Summary

In unincorporated Inyo County, your base zoning still sets what you can build, but overlays add extra layers—like avalanche‑hazard limits, architectural design review, groundwater‑use rules for agriculture, or eligibility for state density bonuses. Always check the zoning map for overlays on your parcel, then plan to meet both base standards and any overlay‑specific approvals or restrictions cited above.

Source References

• Title 18 Zoning — General provisions and district list: § 18.03.050, § 18.03.060, § 18.03.070.
• SAHO — Snow Avalanche Hazard Overlay (Ch. 18.64): § 18.64.010–.060.
• DB — Density Bonus Overlay (Ch. 18.65): § 18.65.010–.050.
• Nongroundwater‑Neutral Agricultural Use Overlay (Ch. 18.67): § 18.67.010–.050.
• D — Architectural Design Control District (Ch. 18.69): § 18.69.010–.060.
• PP — Precise Plan Combining District (Ch. 18.63): § 18.63.030–.080.

Retrieved passages

• Inyo County Zoning Code (§ 4) Medium relevance show source text
• Inyo County Zoning Code (§ 18.67.010.) Medium relevance show source text
• Inyo County Zoning Code (Chapter 18.69.) Medium relevance show source text
• Inyo County Zoning Code (§ 4) Medium relevance show source text
• Inyo County Zoning Code (§ 4) Medium relevance show source text
• Inyo County Zoning Code (§ 18.79.010.) Medium relevance show source text
• CBC § G107 (SECTION G107) Medium relevance show source text
• Inyo County Zoning Code (§ 4) Medium relevance show source text

Cited sections

• Title 18 Zoning — General provisions and district list: § 18.03.050, § 18.03.060, § 18.03.070. (Title 18)
• SAHO — Snow Avalanche Hazard Overlay (Ch. 18.64): § 18.64.010–.060. (§ 18.64.010)
• DB — Density Bonus Overlay (Ch. 18.65): § 18.65.010–.050. (§ 18.65.010)
• Nongroundwater‑Neutral Agricultural Use Overlay (Ch. 18.67): § 18.67.010–.050. (§ 18.67.010)
• D — Architectural Design Control District (Ch. 18.69): § 18.69.010–.060. (§ 18.69.010)
• PP — Precise Plan Combining District (Ch. 18.63): § 18.63.030–.080. (§ 18.63.030)
• InyoCounty_ZoningCode.md

• Official Inyo County code library