El Dorado County — Historic Preservation

Last reviewed: July 6, 2026

Overview

In unincorporated areas, El Dorado County addresses historic preservation primarily through the Design Review—Historic (-DH) Combining Zone, which overlays base zoning and adds project-specific review for work that could affect historic resources. The overlay’s purpose, boundaries, review triggers, and reliance on County-adopted historic design guidelines are set in the County’s zoning ordinance Title 130, not in building or housing codes. Base-zone rights and standards continue to apply; the -DH overlay adds a layer of objective design and compatibility review alongside normal zoning and development standards requirements. See § 130.27.060 for the -DH overlay structure and triggers.

Big picture: If your property lies in a Design Review—Historic (-DH) overlay, you must show project consistency with Board-adopted historic design guidelines; where no permanent guidelines exist yet, the 1982/2018 Historic Design Guides and the County’s interim objective design standards and guidelines apply. See § 130.27.060 and related design-review provisions.

How El Dorado County’s zoning covers historic resources (unincorporated areas)

• The County has a Design Review—Historic (-DH) Combining Zone that “identifies and protects historic structures, sites, and districts” and sets procedures for reviewing projects that may affect them. The Board of Supervisors designates each -DH area after Planning Commission consideration; boundaries are mapped and can be amended by zone changes. See § 130.27.060(A)-(B).
• Within -DH, development review is triggered by use type:
  • On multi-unit residential, commercial, or industrial-zoned property, projects undergo design review for consistency with adopted standards and any applicable Design Review Committee procedures under § 130.52.030; if another discretionary permit (e.g., CUP) is required, that permit fulfills the design review requirement. See § 130.27.060(C)(1) and § 130.52.030.
  • For single-unit residential projects, consistency with historic design standards is verified by an Administrative Permit under § 130.52.010 before a building permit is issued. See § 130.27.060(C)(2).
• The Board adopts historic design guidelines by resolution for each district. Until permanent guidelines are adopted, the County applies the Historic Design Guides (adopted 4/13/1982; reformatted 4/24/2018, Resolution 072-2018). See § 130.27.060(D).
• Countywide, design review in areas with adopted standards uses the County’s Interim Objective Design Standards (IODS) and Interim Design Standards and Guidelines (IDSG); projects in -DH are also subject to the Historic Design Guide until permanent community standards are adopted. See § 130.27(F)(4) (community design review areas and interim standards, applied to -DH).
• Official zoning maps show all zones/overlays; map amendments (including -DH boundaries) are processed per the zone-change chapter. See § 130.12.020.

You’ll coordinate these requirements with regular design review procedures and any applicable overlay districts, parking, signage, and variances and exceptions.

District-by-district breakdown

Design Review—Historic (-DH) Combining Zone

• Purpose: Identify and protect historic structures, sites, and districts; ensure compatible development via design review. See § 130.27.060(A).
• Where it applies: Only in County-designated -DH areas on the official zoning maps; boundaries are set by Board action and can be amended through a zone change. See § 130.27.060(B)(1)-(2) and § 130.12.020.
• Typical permitted uses: The -DH overlay does not change base-zone allowed uses; it adds design-review requirements on top of whatever uses are allowed in the underlying district. See § 130.27.060(C).
• Review triggers and process:
  • Multi-unit residential/commercial/industrial: Design Review Permit per § 130.52.030; if a discretionary permit (e.g., CUP, Development Plan) is required, that permit satisfies design review. See § 130.27.060(C)(1).
  • Single-unit residential: Administrative Permit to verify consistency with adopted historic guidelines before building permit issuance. See § 130.27.060(C)(2).
• Governing design standards:
  • Board-adopted historic guidelines apply; until adopted, use the 1982/2018 Historic Design Guide. See § 130.27.060(D).
  • Until permanent community standards are in place, Countywide IODS and IDSG also apply in -DH. See § 130.27(F)(4).
• Dimensional standards: The overlay does not change base-zone dimensional rules (heights, setbacks, coverage); it layers historic design requirements onto base zoning and County development standards. See § 130.27.060(C) and § 130.52.030(A).

Other County standards that affect historic resources (outside -DH overlays)

• Wineries on listed historic properties: On lots identified as listed on the National or California Registers, winery development must preserve the historic structure; any modification or demolition may be approved only per recommendations of a cultural resource report meeting County guidelines. See § 130.40.400 (Cultural Resource Protection, Wineries).
• Wireless telecommunication facilities: Prohibited on any building/structure or in any district listed on a Federal, State, or local historic register unless determined to have no adverse effect on visual integrity, structure, or eligibility; such facilities must meet Secretary of the Interior Standards and local historic guidelines. See § 130.40.130(F)(5).
• Special Flood Hazard Areas: The floodplain chapter’s “substantial improvement” definition excludes alterations to a “historic structure” that do not preclude continued historic designation, which can materially affect review paths for historic buildings in flood zones. See § 130.32.030 (definitions/use of “historic structure” in SFHA).
• ADUs and historic resources: The County’s ADU standards expressly allow objective design standards that prevent adverse impacts on property listed in the California Register of Historical Resources (consistent with State law). See § 130.40.300(2)(a). For ADU-specific process and State preemption, see our California ADU law page.

Key triggers, permits, and standards (unincorporated areas)

Practical guidance

• Start with the map: confirm whether your parcel has the -DH overlay on the official zoning map, then identify which adopted historic design guidelines apply to that specific -DH district. See § 130.12.020 and § 130.27.060(D).
• Align your submittal with applicable historic guidelines and objective standards (including the County’s interim IODS/IDSG where applicable). This expedites conformance findings during design review. See § 130.27(F)(4) and § 130.52.030(A).
• Remember: -DH does not change base-zone uses or dimensions; it layers historic design criteria over base rules like setbacks, height, parking, and signage. See § 130.27.060(C).

Checklist

• Confirm your parcel’s status on the official zoning map (is -DH applied?). See § 130.12.020.
• Identify the applicable historic design guidelines for your -DH area; if none are yet adopted, use the 1982/2018 Historic Design Guide and County IODS/IDSG. See § 130.27.060(D) and § 130.27(F)(4).
• Determine permit path: Administrative Permit (single-unit residential in -DH) or Design Review Permit (multi-unit/commercial/industrial in -DH); fold into any other required discretionary permits. See § 130.27.060(C); § 130.52.030.
• Check for special County standards that could apply to historic resources even outside -DH: winery rules on listed properties; telecom siting near/on historic resources. See § 130.40.400; § 130.40.130(F)(5).
• Coordinate base-zone dimensional compliance and objective development standards.
• If constraints create hardship, consult variances and exceptions to understand relief tools (case-by-case; not guaranteed).
• For projects involving ADUs, ensure any objective standards used to protect historic resources are consistent with § 130.40.300(2)(a) and State law (see our California ADU law overview).

Risks & Ambiguities

Information Gaps

• Named -DH districts and their exact boundaries/maps: Not found in retrieved materials. Verify with the jurisdiction.
• A consolidated list of Board-adopted, district-specific historic guidelines (beyond the 1982/2018 Historic Design Guide and interim IODS/IDSG references): Not found in retrieved materials. Verify with the jurisdiction.

Plain-English Summary

If your place in unincorporated El Dorado County sits in a historic (-DH) overlay, you’ll need to show your project matches County historic design guidelines. Single-family work uses an Administrative Permit; larger residential, commercial, and industrial proposals use design review, often combined with other permits. Separate County rules also protect listed historic resources for wineries and wireless facilities, even outside -DH.

Source References

• Design Review—Historic (-DH) Combining Zone: § 130.27.060.
• Interim objective design standards and how they apply in -DH: § 130.27(F)(4).
• Design Review Permit areas and process: § 130.52.030.
• Administrative Permit reference for single-unit projects in -DH: § 130.27.060(C)(2) (cites § 130.52.010).
• Zoning Map and zone/overlay adoption and amendment reference: § 130.12.020.
• Wineries—Cultural Resource Protection: § 130.40.400 (Winery standards).
• Wireless Telecommunication Facilities—Historic Resources: § 130.40.130(F)(5).
• Floodplain chapter—historic-structure carve-out in “substantial improvement” context: § 130.32.030.
• ADUs—objective standards to avoid adverse impacts to CRHR-listed properties: § 130.40.300(2)(a).

Retrieved passages

• El Dorado County Zoning Code (Section establishes) High relevance show source text
• El Dorado County Zoning Code (Section 130.60.070) High relevance show source text
• CFC § 130.40.400.2 (Chapter 130.37) Medium relevance show source text
• El Dorado County Zoning Code (Title 25) Medium relevance show source text
• El Dorado County Zoning Code (Section 130.60.070) Medium relevance show source text
• El Dorado County Zoning Code Medium relevance show source text
• El Dorado County Zoning Code Medium relevance show source text
• El Dorado County Zoning Code Medium relevance show source text
• El Dorado County Zoning Code (Chapter which) Medium relevance show source text
• CWUIC § 1 (Chapter 8.09) Medium relevance show source text
• El Dorado County Zoning Code (Section 6409) Medium relevance show source text
• El Dorado County Zoning Code (§ 65915) Medium relevance show source text
• El Dorado County Zoning Code (Section 130.52.010.) Medium relevance show source text
• El Dorado County Zoning Code (Title 130) Medium relevance show source text
• El Dorado County Zoning Code (Section 883.230) Medium relevance show source text
• CBC § 18954 (Section 18954) Medium relevance show source text

Cited sections

• Design Review—Historic (-DH) Combining Zone: § 130.27.060. (§ 130.27.060.)
• Interim objective design standards and how they apply in -DH: § 130.27(F)(4). (§ 130.27)
• Design Review Permit areas and process: § 130.52.030. (§ 130.52.030.)
• Administrative Permit reference for single-unit projects in -DH: § 130.27.060(C)(2) (cites § 130.52.010). (§ 130.27.060)
• Zoning Map and zone/overlay adoption and amendment reference: § 130.12.020. (§ 130.12.020.)
• Wineries—Cultural Resource Protection: § 130.40.400 (Winery standards). (§ 130.40.400)
• Wireless Telecommunication Facilities—Historic Resources: § 130.40.130(F)(5). (§ 130.40.130)
• Floodplain chapter—historic-structure carve-out in “substantial improvement” context: § 130.32.030. (§ 130.32.030.)
• ADUs—objective standards to avoid adverse impacts to CRHR-listed properties: § 130.40.300(2)(a). (§ 130.40.300)
• ElDoradoCounty_ZoningCode.md

• Official El Dorado County code library