Healdsburg — Historic Preservation

Last reviewed: July 2, 2026

Overview

Healdsburg’s historic-preservation rules are in the Land Use Code. Preservation is implemented primarily through the Historic District (HD) Overlay (purpose, permitted uses, design-review thresholds) and the Historic Resources Protection provisions that require a historic demolition permit for designated or potentially historic resources. Key decision-makers are the historic committee (the Planning Commission) and the Zoning Administrator; the rules also refer applicants to the Citywide Design Guidelines and, where applicable, the California Historical Building Code/Title 24. See § 20.12.055–100 and § 20.24.185–240 for the controlling rules.

Note: The text below synthesizes those Healdsburg-specific provisions and cites the exact controlling code sections; where the code text does not answer a practical question I flag it as “Not found in retrieved materials” or “Verify with the jurisdiction.”

How this page uses city resources (quick links embedded)

• The city requires consistency with the Citywide design review guidelines for historic work (§ 20.12.070) .
• Historic overlays layer on top of base-zone development standards and parking rules; check both sets on an application (§ 20.12.060; cross-refers to Chapter 20.16).
• Historic approvals can be treated as an overlay district control; the HD overlay is established per the overlay procedures (§ 20.12.095).
• New accessory dwelling units are treated specially; see the ADU exception in the HD rules and also check ADU policy (§ 20.12.065).
• The city may apply the California Building Standards Code (including the California Historical Building Code) to historic structures (§ 20.12.075).

District-by-district breakdown (Healdsburg-specific)

Note: Historic preservation in Healdsburg is primarily an overlay/regulatory process that sits on top of base zoning. The sections below name actual Healdsburg districts and the preservation controls that intersect them.

Historic District (HD Overlay)

• Purpose: Preserve, maintain and enhance the historic integrity of designated areas and significant structures; provide review of proposed alterations/restorations; encourage compatible public/private enhancements (§ 20.12.055).
• Where it applies (specific areas): The code explicitly incorporates these Healdsburg areas into the HD Overlay: Johnson Street (both sides) between Piper Street and Powell Avenue and Matheson Street (both sides) between East Street and First Street (§ 20.12.095).
• Typical permitted uses: All uses permitted in the base zoning district remain permitted in the HD Overlay; conditional uses in the base district remain conditional. Signs are restricted: no billboards/advertisements except on-premises activity/sale signs (§ 20.12.060).
• Key review triggers and thresholds:
  • Historic committee approval (Planning Commission) required for: new construction in the HD Overlay (including accessory buildings > 400 square feet) except ADUs; demolition of designated historic buildings or contributing structures; alterations that increase floor area by >25%, add a second story, or make a significant change to the front elevation inconsistent with the historic design guidelines (§ 20.12.065).
  • Minor design review (staff) for: new construction that is less than 25% of existing floor area; exterior alterations, repair and rehabilitation of a primary structure (§ 20.12.066).
• Design criteria and standards: All designs must be in harmony with local architectural characteristics (windows, doors, trim, materials, roof form, size and massing) and consistent with Chapter 8 of the Citywide Design Guidelines (§ 20.12.070).
• Safety and code: Fire, safety, and structural codes remain in force; the California Historical Building Code may be applied to designated historic structures (§ 20.12.075).
• Maintenance: Owners must prevent exterior deterioration that would harm the character of the district; the code lists examples of prohibited neglect (roofs, walls, chimneys, plaster/mortar, waterproofing, broken windows) (§ 20.12.085).
• Exceptions & variances: The historic committee can grant minor exceptions that do not affect the general character of the Historic District; larger exceptions follow normal variance processes (§ 20.12.080)
• Governance: The historic committee is the Planning Commission; the committee recommends district boundaries, designates landmarks, and can be appealed to the City Council (§ 20.12.090).

Practical note: If your property sits inside the specific HD Overlay segments above, you should assume historic-committee review for many exterior changes; if outside, consult the Historic Resources Protection rules below for individual-designation or survey-based triggers. (§ 20.12.095; § 20.24.200).

Open Space (O) District — historic sites allowed

• Purpose: Among other aims, the Open Space (O) district explicitly permits officially designated historical sites and scenic areas (§ 20.08.230).
• Typical permitted uses: Parks, playgrounds, public open-space uses, and officially designated historical sites are allowed; consult base O-district rules for development limits (§ 20.08.235).
• When this matters for preservation: If a historic monument or site is located within lands zoned O, the O-district use table already contemplates historical designation and conservation; preservation controls may therefore intersect both overlay and base-district rules (§ 20.08.235).

R-1 Districts (residential) — development standards that apply to historic properties

• Purpose and typical uses: Standard single-family residential uses and accessory uses remain in R-1 zones; historic overlay rules do not change base permitted uses but add review steps where the overlay applies (§ 20.08.030; § 20.12.060).
• Key dimensional standards (example): R-1-6,000: minimum lot area 6,000 sq ft, front yard 20 ft, lot coverage 35%; R-1-12,500: front yard 25 ft, lot coverage 30% — use the base district table when calculating whether proposed additions exceed the 25% increase threshold that triggers historic-committee review (§ 20.08.030; § 20.12.065).

Practical note: The HD Overlay does not change base-zone permitted uses; it adds a layer of design, demolition, and maintenance controls. Always read the overlay and base-zone rules together. (§ 20.12.060)

Historic-Resources (Demolition / Designation) rules — what triggers protection

• Applicability: A historic demolition permit is required before a building permit for demolition is issued when the property is:
  • Listed in the National or California Historic Register, or
  • Designated by the City as a historic resource, or
  • Included in the City’s cultural resources survey and confirmed by the State Office of Historic Preservation as eligible/potentially eligible, or
  • Identified by a qualified architectural historian or by the planning department (in consultation with the Healdsburg Museum) as having historic properties, or
  • Buildings more than 50 years old that meet CEQA criteria for a potential historic resource (§ 20.24.190–200).
• Exemptions: Structures posing immediate threat to safety, structures < 50 years not in the survey, erroneous survey entries, structures deemed not historically significant by the planning department, and demolition that does not affect exterior appearance can be exempt (§ 20.24.200(B)).
• Application requirements: Historic demolition permit applications require: description/location, photographs, basis for applicability, reasons for demolition, evidence alternatives were considered (contractor/engineer reports, cost estimates), and an evaluation by a qualified architectural historian addressing eligibility and neighborhood impact (§ 20.24.205).
• Environmental review & hearings: Historic demolition permit applications require CEQA review and a public hearing before the Zoning Administrator (or referral to the Planning Commission/historic committee) (§ 20.24.210–215).
• Decision standard and delay:
  • The zoning administrator or historic committee may approve, conditionally approve, or deny; they may withhold approval (delay) for up to 180 days to explore alternatives to demolition (§ 20.24.220).
  • Factors considered include significance, contribution to district, cost of preservation, potential for adaptive reuse, and feasibility of relocation (§ 20.24.225)
  • To approve demolition, the reviewer must find at least one of the findings in § 20.24.230 (e.g., structure is not unique/irreplaceable, adaptive reuse infeasible) (§ 20.24.230).
• Conditions of approval: Conditions may include archival documentation (photos, plans), advance approval of design review for replacement construction consistent with Chapter 8 of the Citywide Design Guidelines, donation of identified artifacts to the Healdsburg Museum, and the requirement to obtain a standard demolition permit after the historic permit (§ 20.24.235–240).

Quick decision-relevant standards (table)

Checklist

• Confirm whether the parcel is inside the HD Overlay (Johnson St / Matheson St segments listed) (§ 20.12.095).
• Determine whether the property is a designated historic structure, in the cultural-resources survey, or otherwise identified (triggers in § 20.24.200).
• If demolition or significant alteration is planned, prepare a historic demolition permit application with photos, reasons, alternatives, contractor/engineer cost statements, and a qualified architectural-historian evaluation (§ 20.24.205).
• For exterior changes, calculate whether the proposal increases floor area by >25%, adds a second story, or changes the primary/front elevation (would trigger historic committee review) (§ 20.12.065).
• Prepare design materials consistent with Chapter 8 of the Citywide Design Guidelines and be ready for design review (staff or Planning Commission depending on scale) (§ 20.12.070; see Chapter 20.28 design-review thresholds).
• If the project includes an ADU, confirm the ADU exception in the HD rules and check state ADU law and local ADU page (§ 20.12.065).
• Expect CEQA/environmental review for demolitions and plan for a potential 180‑day delay while alternatives are explored (§ 20.24.210–220).
• Engage early with planning staff and the Healdsburg Museum (the code calls for consultation) and consider hiring a qualified architectural historian for evaluations (§ 20.24.200; § 20.24.205).

Risks & Ambiguities

Plain-English Summary

If your property is listed, in the City’s cultural-resources survey, over 50 years old and CEQA-eligible, or located within the small, mapped Historic District (HD) Overlay (parts of Johnson Street and Matheson Street), most major exterior work, demolitions, and many additions will require review by the historic committee (the Planning Commission) or staff and often a formal historic demolition permit; designs must follow the Citywide Design Guidelines and the city may require CEQA and archival documentation. Verify your property status early, hire an architectural historian if asked, and plan for up to a 180‑day demolition review/delay.

Source References

• Healdsburg Land Use Code — Historic District (HD) Overlay: § 20.12.055–100. Downloaded from https://ecode360.com/HE4475 (Healdsburg Land Use Code).
• Healdsburg Land Use Code — Historic Resources Protection (Historic demolition permit): § 20.24.185–240. Downloaded from https://ecode360.com/HE4475.
• Healdsburg Land Use Code — Historic committee and establishment of HD Overlay, listed areas, and designation of historic structures: § 20.12.090; § 20.12.095; § 20.12.100. Downloaded from https://ecode360.com/HE4475.
• Healdsburg Land Use Code — Design criteria, minor design review, safety and exceptions: § 20.12.066; § 20.12.070; § 20.12.075; § 20.12.080; § 20.12.085. Downloaded from https://ecode360.com/HE4475.
• Healdsburg Land Use Code — R-1 district minimum development standards (example tables): § 20.08.030 (R‑1 standards). Downloaded from https://ecode360.com/HE4475.
• Healdsburg Land Use Code — Open Space (O) district permitted uses including officially designated historical sites: § 20.08.230–235. Downloaded from https://ecode360.com/HE4475.

Retrieved passages

• CBC § 20.12.055 (§ 20.12.055.) High relevance show source text
• CBC § 2 (§ 2) High relevance show source text
• Healdsburg Zoning Code (§ 20.24.190.) High relevance show source text
• Healdsburg Zoning Code (§ 2) High relevance show source text
• Healdsburg Zoning Code (§ 20.24.205) High relevance show source text
• CBC § 2 (§ 2) High relevance show source text
• Healdsburg Zoning Code (§ 2) High relevance show source text
• Healdsburg Zoning Code (§ 20.24.200) High relevance show source text

Cited sections

• Healdsburg Land Use Code — Historic District (HD) Overlay: **§ 20.12.055–100**. Downloaded from (Healdsburg Land Use Code). (§ 20.12.055)
• Healdsburg Land Use Code — Historic Resources Protection (Historic demolition permit): **§ 20.24.185–240**. Downloaded from (§ 20.24.185)
• Healdsburg_ZoningCode.md

• Official Healdsburg code library