Windsor — Development Standards

Last reviewed: July 3, 2026

Overview

This page summarizes Windsor’s zoning development standards (setbacks, heights, lot coverage, density/FAR and related site rules) as expressed in the Town Zoning Code (Title 17). It focuses only on standards in the Zoning Code that directly control site layout and building envelopes; technical building-code requirements remain under the California Building Standards Code. For zoning context and zone maps see the Town’s Windsor Zoning menu. All cited requirements below are taken from the Town Zoning Code (Title 17) and shown with the controlling code section (§) and the file-search citation.

How to read this page

• Bolded terms are what you should scan for (district names and numeric standards).
• The first natural mention of related topics is linked to the Town pages you’ll want while preparing an application: parking, design review, overlay districts, historic preservation, signage, landscaping and screening, and ADUs. Each numeric standard below is grounded to the Zoning Code (§ citation) and the file-search result that contains it.

District-by-district development standards

Note: Article 2 of the Zoning Code establishes the allowable uses and numeric standards for each zone; the general site-planning rules (measurement, projections, and exceptions) are in Article 3. See each cited § for the controlling language.

Rural Residential — RR

• Purpose & typical uses: Low-density single-family residential and compatible accessory uses (see Article 2 for use lists). Verify full permitted-use lists with the Town. Not found in retrieved materials for an explicit use table; see Article 2 references in the code .
• Key dimensional standards: The Code treats RR as one of the low-density residential zones where special rules apply to garage placement and setbacks (garage setback typically deeper than facade). Upper-floor stepbacks apply when adjacent to single-story homes. See § 17.10.050 for upper-floor setback techniques and garage-location notes .
• Where it applies: County/Town designations consistent with the General Plan; parcel-specific constraints and overlays (historic or HO) may add requirements — see § 17.16.050 .

Estate Residential — ER

• Purpose & typical uses: Very low-density residential lots; primary single-family dwellings and accessory uses. Specific allowed uses are set in Article 2 (Zones, Allowable Uses, and Development Standards) — see the code for parcel-level use lists .
• Key dimensional standards: The Code prohibits zero-lot-line development here and expects larger setbacks/lot sizes than medium-density zones; garage placement rules require the garage to be set back from the street facade (garage not to dominate street frontage) — see Table notes and § 17.10.050 .

Surrounding Residential — SR

• Purpose & typical uses: Medium-to-lower density residential category intended for areas transitioning from village to suburban. Small-lot projects and two-unit developments are allowed with the permit routes described below; confirm permitted uses in Article 2. See small-lot allowances in § 17.88.030 .
• Key dimensional standards: For small-lot projects in SR, the Code allows:
  • Front setback: 10 ft minimum (one-story porch may project up to 5 ft) — § 17.88.070.F.1 .
  • Side setbacks: 4 ft (one-story) / 8 ft (two-story) (except for attached/rowhouse/zero-lot-line units) — § 17.88.070.F.2 .
  • Rear setback: 15 ft (with limited exceptions for garages) — § 17.88.070.F.3 .
  • Maximum height: 35 ft for primary structures (unless otherwise specified) — § 17.88.070.F.4 .
• Where it applies: See § 17.88.030 permitting small-lot subdivisions in SR, VR and MDR .

Village Residential — VR

• Purpose & typical uses: Neighborhood-scale residential (smaller lots possible); supports small-lot subdivisions and townhouses where expressly allowed. See Article 2 for specific allowed uses .
• Key dimensional standards: Small-lot rules (front 10 ft, side 4/8 ft, rear 15 ft, height 35 ft) apply where a small-lot subdivision is proposed; the Code allows design flexibility (the review authority may approve alternative setbacks) — § 17.88.070 .
• Where it applies: Small-lot projects are explicitly allowed in VR per § 17.88.030 .

Medium Density Residential — MDR

• Purpose & typical uses: Multifamily and medium-density residential development; small-lot subdivisions may be allowed but note some prohibitions (e.g., detached single-unit dwellings are not allowed in MDR small-lot subdivisions) — § 17.88.030 .
• Key dimensional standards: MDR projects are governed by the zone-specific table in Article 2 and by the project-type chapters (small-lot, two-unit developments, cottage homes, etc.). Confirm density (du/acre) and FAR during project review; PD or CUP processes may set different numeric ranges — see § 17.16.050 for PD/FAR guidance .

Special purpose zones — OS, PI, REC

• Purpose & typical uses: Open Space (OS), Public/Institutional (PI), Recreation (REC) each have development standards in Table 17.16-02. The table explicitly sets low FARs and standard setbacks and heights to preserve these uses.
• Key dimensional standards (Table 17.16-02):
  • Max FAR examples: OS 0.05, PI 1.0, REC 0.10 — § 17.16.050 (Table 17.16-02) .
  • Height (primary): 35 ft; accessory: 15 ft (Table 17.16-02) — § 17.16.050 .
  • Setbacks (examples in the table): Front 20 ft / Rear 20 ft / Side 5 ft / Street side 10 ft for many special-purpose zones — § 17.16.050 (Table 17.16-02) .

Planned Development — PD

• Purpose & typical uses: The PD zone is used when the Town and developer want site-specific standards (density, FAR, setbacks, height, lot coverage) tailored to a parcel. A PD rezoning requires a Preliminary Development Plan that must identify the allowed land uses, minimum/maximum density and FAR, and the development standards that will apply — § 17.16.050.B .
• Practical note: A PD can and should be used to lock in alternative setbacks, lot sizes, and FAR for a large or complex project; expect the Council to approve the PD and Preliminary Plan together — § 17.16.050 .

Small‑lot subdivisions and Cottage Homes (special project types)

• Small-lot subdivisions: Allowed in SR, VR, and MDR with specific site-design standards (min parcel area for detached dwellings often between 1,800–4,000 sq ft, minimum parcel width 25 ft, minimum parcel depth 50 ft) — § 17.88.070.C–E . Front 10 ft / side 4/8 ft / rear 15 ft / height 35 ft — § 17.88.070.F .
• Cottage home developments: Have their own chapter. Highlights include minimum parcel size 8,000 sq ft, cottage size ≤ 850 sq ft, height ≤ 25 ft (garages/carports ≤ 15 ft), front setback 10 ft, and building separation 6 ft between structures — § 17.100.070 .

Two-unit developments (SB9-style / Dwelling Group)

• The Code establishes standards for two-unit developments and dwelling groups. Important numeric rules that control envelope and open space include:
  • Setbacks for these developments: Front 20 ft, Interior side 4 ft, Street side 10 ft, Rear 4 ft (text appears under two-unit/dwelling group standards) — § 17.94.110 .
  • Parcel coverage is limited to the district standard, but the Code allows an increase if the coverage standard would otherwise preclude the construction of an 800 sq ft new dwelling unit — § 17.94.110.I .
  • Off-street parking: generally 1 space per new dwelling unit, with limited exceptions if close to transit or car-share — § 17.94.110.K .
• Where allowed: Dwelling groups and two-unit projects are allowed in RR, ER, SR, and VR under the dwelling-group chapter and in single-unit residential districts under Article 2 when standards are met — § 17.96.030 and Chapter 17.94 generally .

Quick decision‑relevant standards (table)

Practical guidance & interpretation notes

• Setbacks and measurement rules come from the general site-planning chapter; check § 17.20.070 for measurement rules and § 17.20.040 for allowed projections (eaves, porches) before assuming a projection is allowed .
• The Code explicitly allows the Review Authority (Director or Planning Commission depending on the application) to approve alternative setbacks or reductions in limited cases (PD rezoning, Minor Use Permit, or where a strict application prevents creation of an 800 sq ft unit) — see § 17.16.050 and § 17.94.110 .
• Where projects touch an overlay (Historic HO overlay) the historic standards modify development rules; see § 17.16.050.F and Chapter 17.24 for preservation standards — § 17.16.050.F .
• Parking counts and layout are regulated in the off‑street parking chapter; consult the Town’s parking page and Chapter 17.30 for stall/dimensional rules and exceptions such as transit proximity — see the Code reference list in Table 17.16‑02 and § 17.20.030 for related site-planning elements .
• Design Review (plans, materials, and façade treatment) is required for many projects; consult the Town design review menu and Chapter 17.56 for thresholds and procedures — see project-specific chapters (cottage homes, small-lot) that cross‑reference Site Plan & Design Review standards .

Checklist

• Confirm the parcel’s base zone and any overlay districts (HO, PD, etc.). See § 17.16.050 .
• Verify which Article 2 zone table applies and read the zone’s numeric standards (setbacks, lot coverage, height) in the Code. See table references in § 17.16.050 .
• Map required setbacks and measurement points per § 17.20.070 and allowed projections under § 17.20.040 .
• Confirm maximum parcel coverage and whether an increase is permitted to allow an 800 sq ft unit (two‑unit/dwelling group rules) — § 17.94.110.I .
• Confirm parking requirements and exceptions (transit‑proximate exceptions) in Chapter 17.30 and the two‑unit chapter § 17.94.110.K .
• If in a historic area, follow the historic preservation chapter and HO overlay standards — see § 17.16.050.F and Chapter 17.24 .
• Determine whether Site Plan & Design Review or PD rezoning is required; if so, include density/FAR information in preliminary submittal per § 17.16.050.B.2 .
• For ADUs, follow the Code chapter for accessory units and state ADU law; see Chapter 17.82 and the Town ADU page ADUs — Code reference to Chapter 17.82 appears in the small-lot and residential chapters .
• Submit materials showing compliance with landscaping, screening, refuse, utilities, and mechanical screening requirements in § 17.94.030 (project-specific) and Chapter 17.28/17.30 for landscaping and parking details .

Risks & Ambiguities

Plain‑English Summary

Windsor’s zoning rules set where you can put buildings on a lot (setbacks), how tall they can be (commonly 35 ft for primary homes), how much of the lot they can cover (zone‑specific), and special project chapter rules for small‑lot, cottage, and two‑unit developments; check the exact zone table and the project chapters cited above to confirm the numbers that apply to your parcel (e.g., small‑lot front setback often 10 ft, two‑unit front setback 20 ft) — see the specific code sections referenced above for each rule .

Source References

• Chapter 17.20 — General site planning and measurement rules: § 17.20.020, § 17.20.030, § 17.20.040, § 17.20.070.
• Table 17.16‑02 (Development Standards — Special Purpose Zones) and PD standards: § 17.16.050 (Table 17.16‑02).
• PD zone requirements (Preliminary Development Plan, density, FAR): § 17.16.050.B.
• Small‑lot subdivision standards (setbacks, parcel width/depth, densities): § 17.88.030 and § 17.88.070.
• Two‑unit dwelling and lot split standards: Chapter 17.94 (including § 17.94.010, § 17.94.110).
• Cottage home development (parcel size, unit size, height, setbacks): § 17.100.070.
• Temporary housing setbacks and Director authority (modifications): § 17.38.040, § 17.38.050.
• Fence, wall and hedges table (Table 17.26‑01) and fence height measurement: § 17.26.030 and Table 17.26‑01.
• Landscaping, utilities and refuse standards referenced in site chapters: § 17.94.030 and related project chapters.
• Town webpages referenced (for process pages and additional checklists): Windsor zoning & planning overview, Windsor Zoning, Windsor Land Use, Windsor Parking, Windsor Design Review, Windsor Overlay Districts, Windsor Historic Preservation, Windsor Signage, Windsor Landscaping and Screening, Windsor ADUs. (These are the Town pages to open for process and checklists.)

Retrieved passages

• Windsor Zoning Code (Article 2) High relevance show source text
• Windsor Zoning Code (Chapter or) High relevance show source text
• Windsor Zoning Code (Chapter 17.96.) High relevance show source text
• Windsor Zoning Code High relevance show source text
• Windsor Zoning Code (chapter and) High relevance show source text
• Windsor Zoning Code (chapter and) High relevance show source text
• Windsor Zoning Code High relevance show source text
• Windsor Zoning Code (section of) High relevance show source text

Cited sections

• Chapter 17.20 — General site planning and measurement rules: **§ 17.20.020**, **§ 17.20.030**, **§ 17.20.040**, **§ 17.20.070**. (Chapter 17.20)
• Table 17.16‑02 (Development Standards — Special Purpose Zones) and PD standards: **§ 17.16.050** (Table 17.16‑02). (§ 17.16.050)
• PD zone requirements (Preliminary Development Plan, density, FAR): **§ 17.16.050.B**. (§ 17.16.050.B)
• Small‑lot subdivision standards (setbacks, parcel width/depth, densities): **§ 17.88.030** and **§ 17.88.070**. (§ 17.88.030)
• Two‑unit dwelling and lot split standards: Chapter 17.94 (including **§ 17.94.010**, **§ 17.94.110**). (Chapter 17.94)
• Cottage home development (parcel size, unit size, height, setbacks): **§ 17.100.070**. (§ 17.100.070)
• Temporary housing setbacks and Director authority (modifications): **§ 17.38.040**, **§ 17.38.050**. (§ 17.38.040)
• Fence, wall and hedges table (Table 17.26‑01) and fence height measurement: **§ 17.26.030** and Table 17.26‑01. (§ 17.26.030)
• Landscaping, utilities and refuse standards referenced in site chapters: **§ 17.94.030** and related project chapters. (§ 17.94.030)
• Town webpages referenced (for process pages and additional checklists): Windsor zoning & planning overview, Windsor Zoning, Windsor Land Use, Windsor Parking, Windsor Design Review, Windsor Overlay Districts, Windsor Historic Preservation, Windsor Signage, Windsor Landscaping and Screening, Windsor ADUs. (These are the Town pages to open for process and checklists.)
• Windsor_ZoningCode.md

• Official Windsor code library