Del Norte County — Historic Preservation

Last reviewed: July 6, 2026

Overview

In unincorporated areas of Del Norte County, the zoning/planning ordinance does not establish a standalone “Historic Preservation” chapter or a county-run local landmark/district program. Instead, preservation-related triggers appear in two places: (1) floodplain regulations that define a “historic structure” and carve out limited relief for such structures, and (2) the coastal program’s scenic/architectural review tools that protect community character in designated highly scenic areas. Together, these are where most project-level “historic” or character-protection questions intersect the county’s land-use rules.

Plain-English core: There is no dedicated historic district overlay in unincorporated Del Norte County. A “historic structure” matters mainly for floodplain rules, and coastal scenic/architectural review can shape design where views and visual character are protected.

How “Historic Structure” shows up in the Del Norte County Code

• The county’s floodplain chapters define a “historic structure” and expressly carve out alterations to historic structures from what counts as a “substantial improvement,” so long as the work does not jeopardize the structure’s continued historic designation. This appears in both the inland flood chapter (§ 20.47.20, definitions) and its coastal counterpart (definitions within Chapter 21.45), where “historic structure” tracks National/State/local certified-register criteria. See the definition and the “substantial improvement” exception in § 20.47.20 and parallel coastal text under Chapter 21.45 .
• Practically, this means that in mapped Special Flood Hazard Areas, qualifying work to a historic building may avoid being treated as a “substantial improvement,” which can otherwise trigger higher flood-elevation or floodproofing standards. See the “substantial improvement” definition and its carve-out for historic structures in § 20.47.20 and the coastal flood chapter definitions (Chapter 21.45) .

Coastal character and visual review that often affect older buildings

• The county’s certified coastal program uses the Coastal Area Combining District (C) to apply special topic standards. Within it, Highly Scenic Visual Resource Areas can be designated, with an Architectural Review Committee and guidelines to manage design, siting, and even signs in these areas (including where older buildings contribute to a coastal townscape). See § 21.35.50 .
• For new residential structures over 25 feet tall in mapped view corridors or viewpoints, a Visual Resources Analysis is required, addressing compatibility, siting, and view protection. This is a coastal program tool but can influence how additions near older structures are massed and designed. See § 21.50.80 .
• County entitlements (e.g., use permits, rezones, subdivisions) issued in the coastal zone serve as the local coastal development permit (CDP) when consistent with coastal program procedures. See § 21.50.20 (intent/procedural framework for CDPs) .

District-by-District (and Chapter) Breakdown

While there is no historic overlay district in unincorporated areas, these districts/chapters house the operative rules that touch preservation, character, or historic-resource treatment:

Flood Damage Prevention — Inland areas (Title 20) — § 20.47.20, § 20.47.30–.70

• Purpose: Manage development in Special Flood Hazard Areas, incorporating FEMA/NFIP standards. The definitions include “historic structure” and the “substantial improvement” exception for alterations that do not end a structure’s historic status (§ 20.47.20) .
• Typical permitted uses: Not a use district; it applies as an overlay-like standard to any base zone within mapped flood hazard areas. Development permits and elevation/floodproofing standards apply unless exempted or varied (§ 20.47.40–.50) .
• Key dimensional/technical standards: Flood-elevation and construction requirements; the “historic structure” carve-out affects whether work becomes a “substantial improvement” under § 20.47.20 .
• Where it applies: All Special Flood Hazard Areas in unincorporated areas per the FEMA FIRM references in § 20.47.30 .

Flood Damage Prevention — Coastal Zone (Title 21) — Chapter 21.45

• Purpose: Same floodplain framework within the coastal zone; local development permits double as CDPs when processed under coastal procedures (§ 21.50.20) .
• “Historic structure” and “substantial improvement”: The coastal flood chapter definitions mirror the inland chapter’s historic carve-out, again limiting when improvements to historic buildings count as “substantial improvement” (definitions in Chapter 21.45; see the definition excerpt and cross-references) .
• Where it applies: Special Flood Hazard Areas within the coastal zone per § 21.45.30 and administrative provisions in § 21.45.40 .

Coastal Area Combining District (C) — Scenic/Architectural Review — § 21.35.50

• Purpose: Implement the Local Coastal Program’s scenic and design policies, including the option to form an Architectural Review Committee and adopt guidelines in designated Highly Scenic Visual Resource Areas; guidelines may address landform alteration, architectural design/placement, and signs (§ 21.35.50) .
• Typical permitted uses: This is a combining district overlaying base zones; it does not change use permissions but adds design/placement review and guidelines in mapped scenic areas.
• Key dimensional/character standards: Not numerical setbacks; rather, project-specific guidelines and committee recommendations (once adopted) to maintain visual character. For taller residential projects (over 25 feet) visible from designated viewpoints, see the separate Visual Resources Analysis requirement in § 21.50.80 .
• Where it applies: Only in mapped areas designated as highly scenic under the Coastal Element policies and implementing maps; verify parcel status before planning exterior work (§ 21.35.50) .

Decision-relevant standards at a glance

Practical guidance for applicants

• If your property lies in a FEMA flood zone, first determine whether your building qualifies as a historic structure under the county’s flood definitions. This directly affects whether your project counts as a “substantial improvement” and, by extension, whether elevation or floodproofing rules apply (§ 20.47.20; coastal definitions in Ch. 21.45) .
• If you’re in the coastal zone, check whether your parcel is within a Highly Scenic Visual Resource Area or is visible from a designated view corridor; that can trigger a Visual Resources Analysis for taller work and subject you to adopted scenic/architectural guidelines (§ 21.35.50, § 21.50.80) .
• Coastal entitlements run under the county’s coastal procedures; your zoning/land-use permit will typically also function as the coastal development permit if processed for coastal consistency (§ 21.50.20) .

Related reading in this codebase: start with the Del Norte County zoning & planning overview, then confirm base zoning in Del Norte County Zoning and allowed uses in Del Norte County Land Use. If you’re in scenic coastal areas, also see Del Norte County Design Review and Del Norte County Overlay Districts. If signage changes are proposed, see Del Norte County Signage. For bulk/setback rules that will still govern historic properties, check Del Norte County Development Standards. Variance relief where allowed is discussed in Del Norte County Variances and Exceptions. Building-code paths (e.g., the California Historical Building Code under Title 24) are outside zoning and live under California Building Standards Code.

Checklist

• Confirm if the structure is a “historic structure” per floodplain definitions (National/State/local certified status) before scoping work in a flood zone (§ 20.47.20; coastal Ch. 21.45 definitions)
• Map the site: Is it in a Special Flood Hazard Area? Is it inside the coastal zone? (§ 20.47.30, § 21.45.30)
• If in a flood zone, determine whether proposed work would otherwise be a “substantial improvement” and whether the historic carve-out applies (§ 20.47.20; coastal flood definitions)
• If in the coastal zone, verify whether the parcel is within a mapped Highly Scenic Visual Resource Area or a designated view corridor/viewpoint; if a new residential structure will exceed 25 feet in height and be visible, prepare the required Visual Resources Analysis (§ 21.50.80)
• If scenic/architectural guidelines are adopted for your area, align exterior changes, colors, materials, and any new signage with those guidelines (§ 21.35.50)
• In the coastal zone, route your entitlement so it functions as the CDP (§ 21.50.20) and confirm noticing/hearing requirements match coastal procedures
• Coordinate base-zone development standards and any needed relief (setbacks, height, parking) with your project team; pursue variance/exception pathways where the code allows.

Risks & Ambiguities

Information Gaps

• Local landmark designation procedures or a county-maintained historic register: Not found in retrieved materials.
• Any Historic Preservation Overlay zoning district in unincorporated areas: Not found in retrieved materials.
• Demolition review thresholds specific to historic resources outside flood/scenic contexts: Not found in retrieved materials.
• Parcel-level maps for Highly Scenic Visual Resource Areas and view corridors: Verify with the jurisdiction.

Plain-English Summary

For unincorporated Del Norte County, there isn’t a special historic-preservation overlay. If you’re in a flood zone, the code’s definition of a “historic structure” can spare your project from being labeled a “substantial improvement” (and the extras that come with that). In the coastal zone, scenic/architectural review protects views and community character, so bigger or more visible work may face added design scrutiny. Outside those contexts, your project follows normal zoning rules with no special historic overlay.

Source References

• Flood Damage Prevention (inland): definitions and procedures, including “historic structure” and “substantial improvement” — § 20.47.20, § 20.47.30–.40
• Flood Damage Prevention (coastal): chapter framework and definitions referencing “historic structure” — § 21.45.30–.40; definitions within Chapter 21.45
• Coastal Area Combining District — Highly Scenic Visual Resource Areas and Architectural Review Committee — § 21.35.50
• Visual Resources Analysis requirement for taller residential in view corridors/viewpoints — § 21.50.80
• County entitlements equivalent to CDPs (coastal zone) — § 21.50.20

Retrieved passages

• Del Norte County Zoning Code (chapter which) High relevance show source text
• Del Norte County Zoning Code (Title 16) Medium relevance show source text
• Del Norte County Zoning Code (Section 21.35.50) Medium relevance show source text
• Del Norte County Zoning Code (title report) Medium relevance show source text
• Del Norte County Zoning Code (section a) Medium relevance show source text
• Del Norte County Zoning Code (Chapter 21.52.) Medium relevance show source text
• Del Norte County Zoning Code (section to) Medium relevance show source text
• Del Norte County Zoning Code (chapter which) Medium relevance show source text
• Del Norte County Zoning Code (chapter which) Medium relevance show source text
• Del Norte County Zoning Code (title or) Medium relevance show source text
• Del Norte County Zoning Code (section to) Medium relevance show source text
• Del Norte County Zoning Code (Section 21.45.50.A.3.c) Medium relevance show source text
• Del Norte County Zoning Code (section ongoing) Medium relevance show source text
• Del Norte County Zoning Code (Chapter 21.51.) Medium relevance show source text
• Del Norte County Zoning Code (§ 8) Medium relevance show source text
• Del Norte County Zoning Code (Section 66424.2) Medium relevance show source text
• Del Norte County Zoning Code (chapter shall) Medium relevance show source text
• Del Norte County Zoning Code (chapter and) Medium relevance show source text
• Del Norte County Zoning Code (chapter apply) Medium relevance show source text
• Del Norte County Zoning Code (Section 21.35.40) Medium relevance show source text

Cited sections

• Flood Damage Prevention (inland): definitions and procedures, including “historic structure” and “substantial improvement” — **§ 20.47.20**, **§ 20.47.30–.40** (§ 20.47.20)
• Flood Damage Prevention (coastal): chapter framework and definitions referencing “historic structure” — **§ 21.45.30–.40**; definitions within Chapter 21.45 (chapter framework)
• Coastal Area Combining District — Highly Scenic Visual Resource Areas and Architectural Review Committee — **§ 21.35.50** (§ 21.35.50)
• Visual Resources Analysis requirement for taller residential in view corridors/viewpoints — **§ 21.50.80** (§ 21.50.80)
• County entitlements equivalent to CDPs (coastal zone) — **§ 21.50.20** (§ 21.50.20)
• DelNorteCounty_ZoningCode.md

• Official Del Norte County code library