Windsor — Historic Preservation

Last reviewed: July 3, 2026

Overview

Windsor's Zoning Code (Title 17) establishes a local Historic Preservation program through Chapter 17.24 (Historic Preservation and Conservation) and a Historic Overlay Zone (-HO) in Chapter 17.18 (Overlay Zones). The code requires environmental review (CEQA) before altering or demolishing designated historic resources, defines the nomination/designation process for landmarks and districts, sets substantive findings for alterations or demolition, and layers special permitting and incentives for designated resources. See Windsor's zoning rules for context on how historic rules interact with base-zone standards and design review. § 17.24.010, § 17.24.020, § 17.18.050 .

(Links to related pages: Windsor Zoning, Windsor Development Standards, Windsor Design Review, Windsor Overlay Districts, Windsor Parking, Windsor ADUs, and Title 24 are used inline below.)

Key chapters and controlling rules (plain-English + code pointers)

• Purpose: protect historically significant sites/structures that contribute to Windsor’s character. § 17.24.010 .
• CEQA required before any exterior alteration, improvement, or demolition of a historic structure. § 17.24.020 .
• Local designation: Council may place landmarks/districts on the Town Historic Register following the amendment/notice/hearing procedures in Chapter 17.72; permits are stayed while nomination is pending. § 17.24.030; § 17.24.030.C.2 .
• Findings for approving alterations/demolition: Director must find compatibility with period/adjacent structures and no adverse effects unless an economic hardship finding applies. § 17.24.060 .
• Cultural resources (archaeology) survey triggers and professional standards; must consult State Office of Historic Preservation and local tribes where required. § 17.24.050 .
• Historic Overlay Zone (-HO): applied where areas/structures have special historical, architectural or aesthetic value; underlying zone uses remain allowed but additional permit and development rules apply. § 17.18.050 .
• Permit triggers inside the -HO: alterations generally processed as a Minor Use Permit (MUP); demolition requires a Conditional Use Permit (CUP); routine interior work or re-roofs that require building permits may be reviewed administratively by the Director. § 17.16.050.E.2–3 .
• Historic incentives referenced: State Historical Building Code compliance, potential Mills Act contracts, local recognition programs and financial benefits eligibility. § 17.24.090 .

Links used where these related topics are mentioned in prose: Windsor Zoning, Windsor Development Standards, Windsor Design Review, Windsor Overlay Districts, Windsor Parking, Windsor ADUs, California Building Standards Code.

District-by-district breakdown (where Windsor historic rules apply)

Note: the Historic Overlay Zone (-HO) is an overlay; it can be mapped onto any base zone. When -HO is present, the -HO provisions layer on top of the base zone's allowed uses and development standards (see each district below and cross‑references to relevant code sections). Verify with the jurisdiction for parcel‑specific mapping.

Historic Overlay Zone (-HO)

• Purpose: protect structures/areas that are reminders of the Town's past and examples of historic architecture and style. § 17.18.050.A .
• Typical permitted uses: any use allowed in the underlying base zone remains allowed, provided the use complies with the Zoning Code and -HO specific development standards. § 17.18.050.C .
• Key permit/decision standards:
  • Alterations → generally Minor Use Permit (MUP); Director may refer to Commission. § 17.16.050.E.2 .
  • Demolition → Conditional Use Permit (CUP) and additional findings, documentation, or replacement commitments may be required. § 17.16.050.E.2; § 17.24.060.D .
  • Interior-only work, reroofs that require building permits → administrative review by Director. § 17.16.050.E.3 .
• Where it applies: mapped as a suffix to base-zone symbols on Windsor Zoning Map (e.g., NCMU-HO, MDR-HO). Mapping rules and suffix conventions are in § 17.18.020 and Chapter 17.06 (Zoning Map). § 17.18.020 .

Neighborhood Commercial Mixed-Use (NCMU) and Town Center (TC / TCMU)

• Purpose (commercial / mixed-use cores): supports neighborhood/downtown retail and mixed-use development; frequently where historic commercial buildings are located (Station Area/Downtown). See Town Center provisions and Station Area/Downtown Specific Plan interactions. Table 17.12-02; Station Area note in design review chapters. § 17.12.02 .
• Typical permitted uses: retail, restaurants, offices, upper‑story housing, civic uses (per Table 17.12-02). When in -HO, the same base uses apply but are subject to historic standards. Table 17.12-02; § 17.18.050.C .
• Key dimensional standards (decision‑relevant highlights shown in zoning tables): TC density ranges 16–32 du/ac and FAR ranges shown in Table 17.12-02 (e.g., minimum FAR 0.25, other TC ranges). Confirm exact parcel standard in Table 17.12-02 and zoning map. Table 17.12-02 .

Open Space (OS), Public/Institutional (PI), Recreation (REC)

• Purpose: parks, public/quasi-public facilities, resource conservation — examples of public assets that may be historic (park structures, civic buildings). Table 17.16-02 .
• Allowed uses: uses identified in Table 17.16-02; underlying permitted uses apply when -HO is overlaid. Table 17.16-02 .
• Dimensional standards (representative from Table 17.16-02): typical setbacks Front 20 ft; Rear 20 ft; Side 5 ft; Street Side 10 ft for OS/PI/REC unless otherwise specified. Table 17.16-02 (Development Standards—Special Purpose Zones) .

Typical Residential Zones (RR, ER, SR, VR, MDR, etc.)

• Purpose: single-family and multifamily residential zones where historic homes may be designated. Zoning tables list specific residential development standards (lot area, setbacks, height) in Table 17.10-02. § 17.10.040 and Table 17.10-02. § 17.10.040 .
• When a residential parcel is within -HO: underlying residential setbacks/dimensional rules still apply but permit review for exterior changes must meet historic criteria and findings in Chapter 17.24 and -HO permit rules. § 17.18.050.C; § 17.24.040 .

Planned Development (PD)

• Purpose: customized development standards determined at rezoning; often used to preserve significant site features (including historic structures) while permitting alternative design. § 17.14.050; PD is configured during rezoning. § 17.14.050 .
• Relevance: PD approvals can include tailored historic‑preservation conditions or incorporate preservation incentives into the Final Development Plan. When PD parcels are placed in -HO or contain designated resources, Chapter 17.24 standards still control. § 17.14.050; § 17.24.010 .

Quick reference table — decision‑relevant standards / permit triggers

Checklist

• Confirm whether the parcel is mapped with the -HO Historic Overlay on the Windsor Zoning Map. Verify with the jurisdiction. § 17.18.020 .
• For any proposed exterior alteration or demolition, ensure a CEQA review or exemption is on file before permits are issued. § 17.24.020 .
• Establish permit pathway: intend to apply for Minor Use Permit (MUP) for alterations or Conditional Use Permit (CUP) for demolition, unless work is limited to administrative building-permit level items. § 17.16.050.E.2–3 .
• Prepare cultural resources study if the property contains/abuts known historic/archaeological resources; hire qualified professional and consult local tribes as required. § 17.24.050 .
• Assemble documentation (photographs, measured drawings, HABS-level documentation if required) if demolition is proposed, per Director’s submittal requirements. § 17.24.060.D .
• If claiming economic hardship to permit demolition/alteration contrary to findings, be ready to submit adaptive reuse studies, financial evidence, and evidence required by the Director. § 17.24.070 .
• Expect possible referral to Northwest Information Center (archaeology) and possible requirement to use a historic‑preservation design consultant at applicant expense. § 17.16.050.F.4–7 .
• Consider incentives: State Historical Building Code relief, Mills Act eligibility — consult Town for local implementation. § 17.24.090 .
• Request a pre-application conference with the Community Development Department to confirm permit pathway and required studies. § 17.40.030.A .

Risks & Ambiguities

Plain-English Summary

If your Windsor property is mapped with the -HO Historic Overlay or is designated a historic landmark, you cannot do exterior work or demolish the building until CEQA and the Town’s historic review rules are satisfied; exterior changes normally need a Minor Use Permit and demolition typically needs a Conditional Use Permit, with strict findings required to protect historic character. § 17.24.020, § 17.16.050.E .

Source References

• Town of Windsor Zoning Code (Title 17): Chapter 17.24 — Historic Preservation and Conservation (purpose, applicability, landmark designation, criteria, cultural resources, findings, economic hardship, incentives, maintenance). Key sections: § 17.24.010, § 17.24.020, § 17.24.030, § 17.24.040, § 17.24.050, § 17.24.060, § 17.24.070, § 17.24.090, § 17.24.100. .
• Town of Windsor Zoning Code (Title 17): Chapter 17.18 — Overlay Zones (Historic Overlay Zone -HO; mapping, applicability, and permit rules). § 17.18.050.
• Town of Windsor Zoning Code (Title 17): Chapter 17.16 / Table 17.16-02 — Development Standards (Special Purpose Zones) and Table 17.16-01 (land-use matrix notes) for PD/OS/PI/REC development standards and -HO cross‑references.
• Town of Windsor Zoning Code (Title 17): Table 17.12-02 (Development Standards—Commercial/Mixed-Use Zones, includes TC, density/FAR ranges).
• Site Plan & Design Review and Review Authority guidance (applicability and referral to Commission): Chapter 17.56 / § 17.56.020 and Table 17.56-01.
• Definitions (e.g., “Designated Historic Landmark”): Chapter 17.110 definitions.

If you want the exact ordinance PDFs or the Windsor Zoning Map layer showing whether a parcel is in the -HO overlay, request that and I will point you to the specific map/pdf and the precise table (e.g., Table 17.10-02 or the Zoning Map) or prepare a step-by-step application checklist for a demolition or alteration on a designated property. Verify parcel mapping and current active nominations with the Windsor Planning Division. Not found in retrieved materials: parcel-specific overlay mapping and the Town’s step-by-step application forms for Mills Act enrollment (Town may have separate procedures).

Retrieved passages

• Windsor Zoning Code (chapter are) High relevance show source text
• CBC § 050 (Chapter 17.58) High relevance show source text
• CBC § 050 (Chapter 17.24) High relevance show source text
• Windsor Zoning Code (Title XVII) High relevance show source text
• CBC § 18950 (Chapter 17.74) High relevance show source text
• Windsor Zoning Code (Section 17.24.070) High relevance show source text
• Windsor Zoning Code (Chapter 17.24.) High relevance show source text
• Windsor Zoning Code (Chapter 17.24.) High relevance show source text
• Windsor Zoning Code High relevance show source text
• Windsor Zoning Code (Chapter 17.18.) Medium relevance show source text
• Windsor Zoning Code (Chapter 17.16.) Medium relevance show source text
• Windsor Zoning Code (article may) Medium relevance show source text
• Windsor Zoning Code (Chapter 17.18.) Medium relevance show source text

Cited sections

• Town of Windsor Zoning Code (Title 17): **Chapter 17.24 — Historic Preservation and Conservation** (purpose, applicability, landmark designation, criteria, cultural resources, findings, economic hardship, incentives, maintenance). Key sections: **§ 17.24.010**, **§ 17.24.020**, **§ 17.24.030**, **§ 17.24.040**, **§ 17.24.050**, **§ 17.24.060**, **§ 17.24.070**, **§ 17.24.090**, **§ 17.24.100**. . (Title 17)
• Town of Windsor Zoning Code (Title 17): **Chapter 17.18 — Overlay Zones** (Historic Overlay Zone **-HO**; mapping, applicability, and permit rules). **§ 17.18.050**. (Title 17)
• Town of Windsor Zoning Code (Title 17): **Chapter 17.16 / Table 17.16-02 — Development Standards (Special Purpose Zones)** and **Table 17.16-01** (land-use matrix notes) for PD/OS/PI/REC development standards and -HO cross‑references. (Title 17)
• Town of Windsor Zoning Code (Title 17): **Table 17.12-02** (Development Standards—Commercial/Mixed-Use Zones, includes **TC**, density/FAR ranges). (Title 17)
• Site Plan & Design Review and Review Authority guidance (applicability and referral to Commission): **Chapter 17.56** / **§ 17.56.020** and Table 17.56-01. (Chapter 17.56)
• Definitions (e.g., “Designated Historic Landmark”): **Chapter 17.110** definitions. (Chapter 17.110)
• Windsor_ZoningCode.md
• 2025 California ADU handbook.md

• Official Windsor code library