Brentwood — Overlay Districts

Last reviewed: July 1, 2026

Overview

Brentwood’s Title 17 Zoning uses overlays sparingly, typically as add-on rules inside area-specific Planned Development (PD) chapters rather than as citywide “combining” districts. In the retrieved code, two overlays are explicit: an Agricultural Overlay within the PD‑35 chapter, and a Civic Facilities overlay note inside the Garin Ranch specific plan standards. Overlays layer additional permissions or limits on top of a parcel’s base zoning; they do not replace the underlying zoning, land use, or development standards.

• Agricultural Overlay (PD‑35): map at § 17.485.019; permissions and limits are set in subsections A–D of Chapter 17.485, and cross-reference animal-keeping rules in Chapter 17.670 .
• Civic Facilities overlay (Garin Ranch Area #10): identified for possible expansion of school district or city facilities within Garin Ranch (PD‑17), adjacent to a “Public Facilities” section that lists typical civic-use standards .

District-by-District

Agricultural Overlay (within PD‑35)

• Purpose and where it applies
  • Applies to a defined portion of the PD‑35 (Planned Development Thirty‑Five) area; the overlay boundary is on the PD‑35 map at § 17.485.019 (chapter map citations also appear at § 17.485.020) . It is intended to allow ongoing agricultural activity after annexation, while limiting more intensive agricultural industry uses .
• Applicability trigger
  • Parcels must be at least 40,000 sq ft and must have had existing agricultural operations at the time of annexation to the city to use these overlay allowances .
• Typical permitted uses
  • Agricultural operations; farming; raising/keeping dairy and poultry; animal breeding; aviaries; one single-family dwelling; and “similar uses” as determined by the Community Development Director .
• Conditional uses
  • Riding academies; stables; dog kennels (up to 20 dogs); canneries; wineries; agricultural stands; U‑pick; processing of agricultural products; and “similar” uses as determined by the Director (require a CUP) .
• Key dimensional/operational limits
  • Animal thresholds: more than 24 fowl/rabbits/rodents, or 4 large livestock, or 30 small livestock are allowed on qualifying lots; then add up to +2 large livestock or +15 small livestock for each additional 20,000 sq ft over the 40,000 sq ft minimum .
  • Prohibited: slaughterhouses, fertilizer yards, bone yards, rendering plants, and other industrial uses objectionable due to odor/smoke/dust/fumes .
  • Definitions and other rules: the overlay adopts the Chapter 17.670 animal‑keeping framework for terms/standards, but the overlay’s specific animal counts supersede the Chapter 17.670 numbers where they differ .
• Relationship to the base zoning and other standards
  • The overlay adds to PD‑35 permissions/standards; commercial and residential subareas of PD‑35 continue to follow their own permitted/conditional uses and site standards outside the overlay areas (PD‑35 subarea uses and standards summarized across Chapter 17.485) .

Civic Facilities overlay (Garin Ranch – Area #10)

• Purpose and where it applies
  • Within the Garin Ranch specific plan regulations (PD‑17), the code states: “Area #10: A Civic Facilities overlay zone shall be applied to Area #10 for possible expansion of school district or city facilities.” This is a location-specific overlay inside Garin Ranch, not a citywide overlay series .
• Typical permitted uses and dimensional standards
  • The same Garin Ranch section lists a dedicated “Public Facilities” zone, with permitted uses including governmental/public administrative offices, quasi-public utility offices/right‑of‑way, public parks, and public schools; conditional uses include other appropriate public uses as determined by the planning commission. Site standards shown there include a 10,000 sq ft minimum lot area, 100 ft minimum lot width, setbacks of 10 ft front, 20 ft rear, 15 ft side, and a 30 ft maximum height .
  • Not found in retrieved materials: a direct cross‑reference stating the Civic Facilities overlay in Area #10 automatically applies those “Public Facilities” standards. Verify with the jurisdiction whether PF standards govern an Area #10 entitlement.
• Relationship to other requirements
  • Garin Ranch development remains subject to its specific plan and Title 17 standards, including design review, parking, signage, and landscaping and screening where applicable across PD‑17 .

Decision-Relevant Standards (selected)

Notes:

• Overlays add to the underlying district. Continue to check the base district’s zoning, parking, signage, and landscaping and screening rules as applicable.

Information Gaps

• Citywide overlay framework (e.g., floodplain, hillside, historic overlay districts): Not found in retrieved materials. See Brentwood Historic Preservation for context if applicable.
• Explicit text tying the Garin Ranch Area #10 “Civic Facilities overlay” to the “Public Facilities” dimensional standards: Not found in retrieved materials; Verify with the jurisdiction.
• Official overlay map links outside PD‑35: Not found in retrieved materials.

Checklist

• Confirm your parcel’s base zoning and any PD subarea in the city’s maps and PD chapter text; then check whether an overlay applies (for PD‑35, use § 17.485.019) .
• If in the Agricultural Overlay, verify minimum lot size (40,000 sq ft) and that agricultural operations existed at annexation before relying on overlay rights .
• If pursuing a conditional use (e.g., winery, U‑pick, kennel), prepare for a CUP; align with PD‑35 overlay lists and base PD standards; coordinate early with staff .
• If in Garin Ranch Area #10, confirm with Planning whether the “Civic Facilities overlay” triggers PF standards and uses listed in the same section; request written confirmation .
• Check overlay interactions with base standards: setbacks, heights, lot coverage, and parking still apply unless expressly varied by the PD chapter.
• Determine whether design review is required for your project type in the PD area; many PDs require it.
• For existing uses that don’t match current code, evaluate nonconforming status and whether a variance or exception is needed.

Risks & Ambiguities

Plain-English Summary

Brentwood doesn’t use a lot of overlays. The big one you’ll see is an Agricultural Overlay inside the PD‑35 area that lets long‑standing, large‑lot properties keep and expand certain farm uses and animals under set thresholds, while banning heavy industrial ag uses. A second, very localized “Civic Facilities overlay” is noted inside Garin Ranch for potential school/city facility expansion. Everything else still follows your base PD or zoning rules, plus normal parking, design review, and signage requirements.

Source References

• Brentwood Municipal Code, Chapter 17.485 PD‑35 — Agricultural overlay text and map references (§ 17.485.019, § 17.485.020); overlay permitted/conditional/prohibited uses; animal thresholds; Chapter 17.670 cross‑reference for animal definitions .
• PD‑35 base district permitted/conditional uses and development standards (context for areas outside the overlay) .
• Garin Ranch specific plan (PD‑17) — note applying a “Civic Facilities overlay” to Area #10; proximate “Public Facilities” permitted uses and site standards (lot area, width, setbacks, height) used in the same section .
• Additional PD context showing Title 17 processes (design review, parking, signage, landscaping) apply within PDs (various PD chapters) .

Retrieved passages

• Brentwood Zoning Code (Section 17.470.005.) High relevance show source text
• Brentwood Zoning Code (Chapter 17.489) High relevance show source text
• Brentwood Zoning Code (title 17) High relevance show source text
• Brentwood Zoning Code (§ 2) High relevance show source text
• Brentwood Zoning Code (Chapter 17.456) High relevance show source text
• Brentwood Zoning Code (Chapter 17.620) High relevance show source text
• Brentwood Zoning Code (Section 17.620) High relevance show source text
• Brentwood Zoning Code (Section 17.473.006.) High relevance show source text
• Brentwood Zoning Code (Section 17.640) High relevance show source text
• Brentwood Zoning Code (Section 17.485.020.) High relevance show source text
• Brentwood Zoning Code (Chapter 17.670) High relevance show source text
• Brentwood Zoning Code (§ 2) Medium relevance show source text
• Brentwood Zoning Code (§ 2) Medium relevance show source text
• Brentwood Zoning Code (§ 2) Medium relevance show source text
• Brentwood Zoning Code (§ 2) Medium relevance show source text
• Brentwood Zoning Code (Chapter 17.630) Medium relevance show source text
• Brentwood Zoning Code Medium relevance show source text

Cited sections

• Brentwood Municipal Code, Chapter 17.485 PD‑35 — Agricultural overlay text and map references (§ 17.485.019, § 17.485.020); overlay permitted/conditional/prohibited uses; animal thresholds; Chapter 17.670 cross‑reference for animal definitions . (Chapter 17.485)
• PD‑35 base district permitted/conditional uses and development standards (context for areas outside the overlay) .
• Garin Ranch specific plan (PD‑17) — note applying a “Civic Facilities overlay” to Area #10; proximate “Public Facilities” permitted uses and site standards (lot area, width, setbacks, height) used in the same section .
• Additional PD context showing Title 17 processes (design review, parking, signage, landscaping) apply within PDs (various PD chapters) . (Title 17)
• Brentwood_ZoningCode.md

• Official Brentwood code library