Local zoning · Brentwood

Brentwood — Historic Preservation

Q: Will my project in a PD zone be reviewed for context or historic compatibility?

Many PD districts require design review . While Title 17 doesn’t list historic criteria, PD-53 expressly applies the Chapter 17.820 design and site development review procedure—typical of how the City looks at context. Verify with your PD chapter.

Historic Preservation under the Brentwood local zoning and planning code, with the controlling citations.

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Last reviewed: July 1, 2026

Overview

Brentwood’s zoning regulations in Title 17 do not establish a standalone “Historic Preservation” chapter, historic landmark register, or a citywide historic overlay. Instead, historic-resource considerations surface where they affect other approvals, most notably in the city’s two-unit (SB 9) rules and in areas governed by adopted specific plans such as Downtown and Brentwood Boulevard. In practice, you will encounter historic triggers through the SB 9 location limits, project-specific design review requirements embedded in district regulations, and—outside the built environment—agricultural land programs that reference sites with historic value.

How Brentwood’s zoning addresses historic resources

SB 9 location limits: Brentwood’s two‑unit housing chapter bars SB 9 projects on any lot in a “historic district” or on a “property included on the State Historic Resources Inventory,” and on sites designated as a local landmark or historic property/district pursuant to a city or county ordinance. This is a bright-line ineligibility rule for SB 9 projects citywide. The same chapter sets reduced side/rear setbacks of 4 ft for eligible SB 9 sites, which do not apply if the site is ineligible due to historic status.
Downtown and corridor plans: The DT (Downtown) zone and the BB (Brentwood Boulevard) zone are controlled by their adopted specific plans, which supersede general zoning for properties in those areas. Any historic-context design criteria would live in those plans, not in the base code text.
Design review touchpoints: Many districts and planned developments require design review. While Title 17 does not specify historic criteria for design review, several districts explicitly require conformance with Chapter 17.820’s design and site development procedure for their projects—this is a procedural hook where context-sensitive design is applied.
Agricultural open land with historic value: Brentwood’s land use-adjacent agricultural preservation program allows conservation of agricultural land that may possess “historic or other important values,” but this applies to open lands rather than built historic structures.

District-by-District

Citywide — Two-Unit Housing Developments (Chapter 17.797)

Purpose: Implements state SB 9 two‑unit housing on eligible single-family lots.
Typical permitted use: Two primary dwellings on one lot, subject to objective standards and site eligibility.
Key dimensional standards: Among the objective standards, side and rear setbacks are set at 4 ft for SB 9 developments on eligible parcels.
Historic preservation hook: A two‑unit development may not be located within a historic district; on property on the State Historic Resources Inventory; or on a locally designated historic landmark/property/district. If any of these apply, SB 9 is off the table.
Where it applies: Any single-family zone or single-family subarea of a Planned Development district, unless disqualified (including by historic status).

DT (Downtown) Zone — Downtown Specific Plan (Chapter 17.280)

Purpose: Encourages coordinated reinvestment and cohesive design in Downtown; the Downtown Specific Plan is the controlling land-use and development regulation within this zone.
Typical permitted uses: Governed by the adopted Downtown Specific Plan, which replaces prior ordinance-based use lists for this area. Not found in retrieved materials.
Key dimensional standards: Governed by the Downtown Specific Plan. Not found in retrieved materials.
Historic preservation hook: Any historic-related standards would be within the specific plan documents reviewed at entitlement; Title 17 points all applications to conform with the plan. Verify with the jurisdiction.
Where it applies: Properties mapped in the DT zone.

BB (Brentwood Boulevard) Zone — Brentwood Boulevard Specific Plan (Chapter 17.290)

Purpose: Transforms the former SR‑4 corridor into a traditional boulevard with distinctive buildings and landscaping; the Brentwood Boulevard Specific Plan controls here.
Typical permitted uses: Established by the Brentwood Boulevard Specific Plan. Not found in retrieved materials.
Key dimensional standards: Established by the Brentwood Boulevard Specific Plan. Not found in retrieved materials.
Historic preservation hook: If the corridor plan sets historic-context design direction, it will be applied through plan conformity and design review. Title 17 defers to the plan text. Verify with the jurisdiction.
Where it applies: Properties mapped in the BB zone.

Planned Development (PD) Zones — General Regulations (Chapter 17.450)

Purpose: Implements specific plans and coordinated site planning where a mixture of uses, intensities, or variations in standards are needed; PDs often embed development standards and design review triggers for projects.
Typical permitted uses: “Any and all compatible uses” consistent with the General Plan and the PD text; ADUs are allowed in PDs that allow single-family or multifamily use (see ADUs).
Key dimensional standards: Set in each individual PD chapter or plan exhibit; deviations require a zoning text amendment or variance. Verify with the jurisdiction.
Historic preservation hook: No PD-wide historic rules in Title 17; however, PDs routinely require design review. For example, PD-53 states that Chapter 17.820 design and site development review applies—this is where context-sensitive design is reviewed, including in areas with historic character.

Key Historic-Preservation Triggers and Where They Live

Topic/Trigger	What it does	Where it applies	Code Reference
SB 9 ineligibility for historic resources	Disqualifies two‑unit (SB 9) projects on lots in a historic district, on State Historic Resources Inventory parcels, or on locally designated landmarks/properties/districts	Citywide, on otherwise SB 9‑eligible single-family parcels	Chapter 17.797 (Two‑Unit Housing Developments) — location limits; 4‑ft side/rear SB 9 setbacks on eligible sites also specified
Downtown Specific Plan control	Requires all DT projects to conform to the Downtown Specific Plan rather than base ordinance text	DT zone	Chapter 17.280 DT zone — plan governs use/standards; consult the plan for any historic-context design criteria
Brentwood Boulevard Specific Plan control	Requires all BB projects to conform to the corridor plan rather than base ordinance text	BB zone	Chapter 17.290 BB zone — plan governs use/standards; consult the plan for any historic-context design criteria
Design and Site Development Review procedure	Establishes project-level design review; frequently required in PDs and other districts	As required by district/PD	PD-53 explicitly applies Chapter 17.820 design review to projects in that PD (example of how design review is used)
Agricultural land with “historic” value	Allows conservation of agricultural lands that may include historic values (open-space context)	Agricultural preservation areas	Chapter 17.730 Agricultural Preservation Program; eligibility cites parcels with “historic or other important values”

Note: For accessory dwellings on historic properties, state law allows local agencies to apply objective standards that prevent adverse impacts on listed historic resources while still allowing ADUs; see the state guidance under California ADU law.

Checklist

Confirm whether your parcel is in a “historic district,” on the State Historic Resources Inventory, or designated as a local landmark/historic property or district. If yes, SB 9 two‑unit projects are ineligible.
If in the DT or BB zones, obtain and follow the applicable adopted specific plan; those plans, not base code, set the governing land-use and design rules in these areas.
Determine whether your zoning or PD district requires design review and prepare context-sensitive materials accordingly; several PDs apply Chapter 17.820.
Coordinate with development standards and parking requirements that still apply to your project, even if historic context is present.
For ADUs on historically sensitive sites, plan for objective standards that avoid adverse impacts on listed resources per state law; do not assume an ADU is prohibited solely due to historic status.
If your site involves agricultural open land with potential historic value, review the city’s agricultural preservation program for conservation options.

Risks & Ambiguities

Issue	Why it matters	What to verify
No standalone historic preservation chapter in Title 17	There is no citywide listing/overlay mechanism described in the zoning text	Whether Brentwood maintains a local register or separate preservation ordinance outside Title 17; Not found in retrieved materials
Where are historic district boundaries?	SB 9 eligibility turns on this; Downtown projects may also rely on plan policies	Ask the City for official maps/lists of historic districts and designated properties; Not found in retrieved materials
Downtown/BB plan content lives outside Title 17	Historic-context design rules, if any, would be in the adopted plans	Obtain the Downtown Specific Plan and BBSP documents referenced by Chapter 17.280 and 17.290
Demolition controls for historic buildings	Could limit or shape demolition/replacement	Any demolition-review standards specific to historic properties; Not found in retrieved materials
Using variances for preservation outcomes	Relief from standards may be requested but criteria/time limits apply	Variance process and limits in Title 17 (time limits; minor variances) before pursuing this tool; see general variance rules.

Plain-English Summary

Brentwood’s zoning doesn’t have a single “historic overlay” to manage old buildings; instead, historic issues show up in the SB 9 rules (which bar two‑unit projects on historic/district-listed sites), and in areas where adopted plans like Downtown control design and land use. Expect to go through design review in many districts, and—if you’re planning an ADU—know that the city can apply objective standards to avoid harm to listed historic resources while still allowing your unit under state law.

Source References

Brentwood Municipal Code Title 17 — General provisions; applicability of zoning regulations.
Chapter 17.797 (Two‑Unit Housing Developments) — SB 9 location limits referencing historic districts and inventory-listed or locally designated historic properties; and 4‑ft side/rear setback standard for eligible sites.
Chapter 17.280 DT (Downtown) — Downtown Specific Plan governs land use and development within DT.
Chapter 17.290 BB (Brentwood Boulevard) — Brentwood Boulevard Specific Plan governs land use and development within BB.
Chapter 17.450 (Planned Development Zones—General Regulations) — PD purpose/authority, standards by PD, ADU allowance in PDs.
PD-53 example — applies Chapter 17.820 design and site development review.
Chapter 17.730 (Agricultural Preservation Program) — includes conservation of lands that may possess “historic” values.
State: 2025 California ADU Handbook — ADUs allowed on historic properties; local agencies may apply objective standards to prevent adverse impacts on listed historic resources.

Information Gaps

Whether Brentwood has a separate local historic register, designation criteria, or certificate-of-appropriateness process outside Title 17. Not found in retrieved materials.
Any demolition review, alteration standards, or preservation incentives tailored to locally designated historic resources. Not found in retrieved materials.
Specific Downtown or Brentwood Boulevard plan policies that address historic character/design; Title 17 defers to those plans, which were not included in the retrieved excerpts. Not found in retrieved materials.

Sources

Retrieved passages

Brentwood Zoning Code (Chapter 10) High relevance
Brentwood Zoning Code (Chapter 17.620) Medium relevance
Brentwood Zoning Code (§ 2) Medium relevance
Brentwood Zoning Code (§ 2) Medium relevance
Brentwood Zoning Code (Chapter 12.75) Medium relevance
Brentwood Zoning Code (§ 65915) Medium relevance
Brentwood Zoning Code (Chapter 17.800.) Medium relevance
Brentwood Zoning Code (§ 2) Medium relevance
Brentwood Zoning Code (Chapter 17.489) Medium relevance
Brentwood Zoning Code (Section 17.820.) Medium relevance
Brentwood Zoning Code (title 17) Medium relevance
Brentwood Zoning Code (title imposes) Medium relevance
Brentwood Zoning Code (§ 2) Medium relevance
Brentwood Zoning Code (Chapter 17.290) Medium relevance
Brentwood Zoning Code (Chapter 17.820.) Medium relevance
Brentwood Zoning Code (Chapter 17.630) Medium relevance
Brentwood Zoning Code (§ 2) Medium relevance
Brentwood Zoning Code (Chapter 17.820.) Medium relevance

Cited sections

Official Brentwood code library

Frequently asked questions

Does Brentwood have a local historic overlay district in Title 17?

Not in the retrieved zoning text. Title 17 does not establish a citywide historic overlay, local register, or certificate-of-appropriateness process. Historic issues arise through SB 9 ineligibility and through specific plans like Downtown, which govern projects within their boundaries. Not found in retrieved materials; Downtown control cited in § 17.280.

Can I use SB 9 to build two units if my Brentwood lot is in a historic district?

No. Brentwood’s SB 9 chapter makes lots in a historic district, on the State Historic Resources Inventory, or on a locally designated historic property/district ineligible for two‑unit developments. If your lot is eligible, reduced side/rear setbacks of 4 ft apply. See Chapter 17.797.

Do Downtown Brentwood projects have special historic design rules?

Any historic-context standards would be in the Downtown Specific Plan, which supersedes base zoning within the DT zone. Title 17 directs all Downtown projects to conform to that plan. Obtain the plan to confirm specific requirements. § 17.280.

Will my project in a PD zone be reviewed for context or historic compatibility?

Many PD districts require design review. While Title 17 doesn’t list historic criteria, PD-53 expressly applies the Chapter 17.820 design and site development review procedure—typical of how the City looks at context. Verify with your PD chapter.

Are ADUs allowed on properties with historic status in Brentwood?

Yes. State ADU law allows ADUs in historic districts and on historic properties; the City may apply objective standards to prevent adverse impacts on listed historic resources, but cannot unreasonably restrict ADUs. See state guidance.

Does Brentwood regulate preservation of historic farmland or open space?

Brentwood’s agricultural preservation program can conserve agricultural parcels that have “historic or other important values,” but this is an open-space/land conservation tool, not a building preservation code. Chapter 17.730.

If I need relief to preserve a historic feature, can I request a variance?

Possibly. Title 17 provides a variance process (with timelines and minor-variance authority) that could be considered for relief from certain standards; however, there are no variance provisions tailored specifically to historic resources. See Chapter 17.860 (general variance rules).

Where do I find the exact list of Downtown or BB plan standards?

In the adopted Downtown Specific Plan and Brentwood Boulevard Specific Plan documents referenced by §§ 17.280 and 17.290. Title 17 points to those plans, which set uses, form, and design. Obtain them from the City.

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