Brea — Overlay Districts

Last reviewed: July 1, 2026

Overview

Brea’s Zoning Code (Title 20) uses several overlay and supplemental zoning districts to layer targeted requirements on top of a property’s base zone. These overlays do not change the underlying land use permissions in the base zone; they add location-specific rules to address hazards, rural/equine use, and corridor design along arterials. The City’s list of zones includes the overlay and supplemental designations WD, E, FP, and SGS, among others . When navigating overlays, start with your base zone under Brea Zoning, then apply any overlay standards described below.

How Brea’s overlays work

• Overlays apply in addition to your base zone; base-zone permitted uses still govern unless a chapter says otherwise. This is explicit in the WD, E, and SGS chapters, which all state that the underlying zone’s use permissions apply while imposing extra standards and/or submittals for the overlay area .
• Where an overlay references citywide processes or standards (e.g., plan review, general site standards), the normal Title 20 procedures still apply. Use Brea Development Standards for citywide dimensional and operational rules, Brea Design Review for plan review triggers and submittals, and Brea Parking for off‑street requirements if your project scope includes new construction or intensification.

District-by-District

WD Wall Design Overlay Zone (WD)

Purpose and where it applies

• Purpose: uniform, visually pleasing perimeter walls along the city’s arterial highways shown on Brea’s Master Plan of Roadways .
• Mapping: Applied as an additional zone classification to parcels along arterial corridors; it “adds on” to any base zone .

Typical permitted uses

• Uses default to the underlying base zone; WD does not alter allowed uses or prohibitions .

Key dimensional and design standards

• Minimum wall setback from public sidewalk: 6 inches (final setback set by City Planner) .
• Wall height: 6 to 8 ft, measured from highest adjacent grade (final height set during plan check) .
• Materials and uniform treatments: tan slumpstone block (8"x6"x16"), one pilaster per property, and a slumpstone wall cap per City standards; exhibits referenced in Title 20’s appendix guide exact appearance .
• Process: A building permit is required; the City Planner, City Engineer, and Building & Safety Manager review—submittals must include plot plan, elevations, cross‑section, materials notes, and structural info as needed .

E Equestrian Overlay Zone (E)

Purpose and where it applies

• Purpose: allow private, noncommercial horse keeping in rural conditions where historically present, with site and animal‑care standards to protect health, safety, and neighborhood compatibility .
• Mapping: Applied only to Single‑Family Residential (R‑1) lots in Olinda Village; see the Olinda Village map in Title 20’s appendix .

Typical permitted uses

• Underlying base‑zone uses continue to apply; the overlay authorizes private horse keeping when the overlay’s standards are met (commercial equine uses are not allowed) .

Key dimensional and operational standards

• Minimum lot area and frontage: 1 acre (43,560 sf) and 30 ft street frontage .
• Horse allocation: up to 4 horses on the first acre; then +1 horse per 15,000 sf beyond an acre (round up if a fraction); foals under 1 year do not count toward the allocation .
• Setbacks for horse housing structures: 100 ft from any neighboring dwelling off‑site; 50 ft from any dwelling on the same property; 25 ft from property lines .
• Setbacks for pastures/exercise areas: 75 ft from neighboring dwellings off‑site; 35 ft from on‑site dwellings; 25 ft from property lines .
• Enclosure: a secure fence/wall min. 6 ft high enclosing equine areas; gates must be secure when unattended .
• Other criteria: private, noncommercial use only; no horse structures in front yards; waste management and animal‑care standards required, including compliance with California’s anti‑cruelty law; UC Davis “Minimum Standards of Horse Care” incorporated by reference for E‑zone properties .
• Process scale: “Minor” projects (lots 1–5 acres) proceed via building permit review to confirm compliance; “Major” projects (sites >5 acres) require a conditional use permit with specified submittals (boundary survey, detailed site/landscaping/arena plans, grading plan, etc.) .

FP Flood Plain Overlay District / Flood Hazard Overlay (F)

Purpose and where it applies

• Purpose: minimize flood losses and protect life and property in areas of special flood hazard .
• Mapping/basis: the overlay applies to FEMA‑mapped Special Flood Hazard Areas identified in the countywide Flood Insurance Study and FIRMs dated December 3, 2009, as amended; the FIS/FIRMs are adopted by reference and kept on file with the City Clerk .

Typical permitted uses

• Uses follow the base zone, but any development activity within the F overlay must comply with Brea’s floodplain management regulations in Title 18 (Division II) before construction, alteration, or placement of structures/uses .

Key development standards

• Core requirement: full compliance with Title 18’s floodplain standards for any structure or land use inside the F overlay. The overlay points you to the floodplain chapter for elevations, floodproofing, encroachments, and other technical rules that apply on top of your base zone .

SGS Special Geologic Studies Zone (SGS)

Purpose and where it applies

• Purpose: protect life and property from geologic faulting by requiring fault hazard evaluation before approving any development permit or tentative map on affected properties .
• Mapping: applied by attaching “(SGS)” to the base zone symbol on the zoning map; “(SGS)” functions as an Overlay District and does not supersede other overlay requirements if multiple apply .

Typical permitted uses

• All base‑zone permitted and conditional uses remain allowable, subject to certification that a Special Geologic Studies Zone Analysis has been submitted and considered under § 20.280.050 .

Key procedural and technical standards

• Completeness timing: for projects where State law imposes a decision deadline of 180 days or less, applications are not deemed complete until all required SGS analyses and documentation are submitted, including the final analysis, to the initial City review body .
• Analysis content and preparers: the SGS analysis is a combined geologic and soils investigation prepared by a CA‑registered geologist (certified engineering geologist) and a licensed civil engineer qualified in soil mechanics, with specified scope and interagency consultation before completion .

Quick comparison — Overlay triggers and key standards

Notes:

• The official list of Brea zones, including overlay/supplemental designations (WD, E, FP, SGS), is established in § 20.04.010 and shown on the City’s zoning map; always verify your parcel’s designations on the Official Zoning Map .

Checklist

• Confirm your base zoning and any overlays on the City’s Official Zoning Map under Brea Zoning; look for suffixes like “WD,” “E,” “FP,” or “(SGS)” on the map or zone symbol. See § 20.04.010 for designations .
• For WD: Prepare a compliant wall plan set (plot plan, elevations, cross‑section, materials, structural notes); secure building permit with planner/engineering review per § 20.262.050 .
• For E: Confirm lot size and horse allocation; site all equine structures and pastures to meet stated setbacks; prepare enclosure fencing plan; if site >5 acres or facility scale is “major,” assemble CUP submittals per § 20.263.050 .
• For FP: Document location relative to FEMA FIRMs (Dec 3, 2009 FIS; as amended) and demonstrate compliance with Title 18 Division II before any construction or alteration per § 20.276.050 .
• For SGS: Retain qualified professionals and complete the Special Geologic Studies Zone Analysis before the City will accept a discretionary application in SGS areas per § 20.280.050 and § 20.280.040 .
• If your project includes new structures, apply general Title 20 rules (e.g., setbacks, screening, signs) in addition to the overlay. See Brea Development Standards, Brea Landscaping and Screening, and Brea Signage.
• Check if your scope triggers Brea Design Review or site Brea Parking updates.
• If an overlay standard makes an existing situation nonconforming, see Brea Nonconforming Uses. For tailored relief where allowed, see Brea Variances and Exceptions.

Risks & Ambiguities

Plain-English Summary

Overlays in Brea don’t change what your property can be used for; they add extra rules where the City needs them. If you’re along a major street, the WD overlay dictates exactly how your perimeter wall must look. In Olinda Village, the E overlay sets minimum lot size, horse counts, and big setbacks from homes. In mapped flood zones, the FP overlay requires you to meet floodplain rules. Where fault hazards are mapped, the SGS overlay requires a geologic study before the City will process your project. Start with your base zone, then layer on any overlay rules that apply to your parcel.

Source References

• Brea Zoning Code — Establishment of zones and overlay designations: § 20.04.010
• WD Wall Design Overlay Zone: § 20.262.010–.050 (intent, standards, process)
• E Equestrian Overlay Zone: § 20.263.010–.050 (intent, lot/horse standards, setbacks, process)
• FP Flood Plain Overlay District / Flood Hazard Overlay (F): § 20.276.030–.050 (purpose, FEMA mapping, Title 18 compliance)
• SGS Special Geologic Studies Zone: § 20.280.010–.050 (intent, overlay application, analysis requirements and timing)

Retrieved passages

• Brea Zoning Code (§ 20.276.040.) High relevance show source text
• Brea Zoning Code (§ 20.261.020.) High relevance show source text
• Brea Zoning Code (§ 20.263.020.) High relevance show source text
• Brea Zoning Code (§ 20.263.050.) High relevance show source text
• Brea Zoning Code (§ 20.56.050.) High relevance show source text
• Brea Zoning Code (§ 20.236.040.E) High relevance show source text
• Brea Zoning Code (§ 20.276.030.) High relevance show source text
• Brea Zoning Code (§ 20.258.020.) High relevance show source text
• Brea Zoning Code (§ 20.262.010.) High relevance show source text
• Brea Zoning Code (section of) High relevance show source text
• Brea Zoning Code (Section 20.408.010.) High relevance show source text
• Brea Zoning Code (§ 20.280.020.) High relevance show source text
• Brea Zoning Code (§ 597) High relevance show source text
• Brea Zoning Code (§ 20.263.020.) High relevance show source text
• Brea Zoning Code (§ 20.263.040) High relevance show source text
• Brea Zoning Code (§ 20.258.020) Medium relevance show source text
• Brea Zoning Code (§ 20.408.040.) Medium relevance show source text

Cited sections

• Brea Zoning Code — Establishment of zones and overlay designations: § 20.04.010 (§ 20.04.010)
• WD Wall Design Overlay Zone: § 20.262.010–.050 (intent, standards, process) (§ 20.262.010)
• E Equestrian Overlay Zone: § 20.263.010–.050 (intent, lot/horse standards, setbacks, process) (§ 20.263.010)
• FP Flood Plain Overlay District / Flood Hazard Overlay (F): § 20.276.030–.050 (purpose, FEMA mapping, Title 18 compliance) (§ 20.276.030)
• SGS Special Geologic Studies Zone: § 20.280.010–.050 (intent, overlay application, analysis requirements and timing) (§ 20.280.010)
• Brea_ZoningCode.md

• Official Brea code library