Los Angeles — Historic Preservation

Last reviewed: July 2, 2026

Overview

Los Angeles regulates local historic preservation primarily through a Historic Preservation Overlay Zone (HPOZ) program, Conservation Districts, and review tools administered by the Department of City Planning and the Historic Preservation Board. The HPOZ rules sit in the Zoning Code (Chapter 1A) and set review triggers, exemptions, and required findings for work on contributing and non‑contributing elements; establishment and amendment of HPOZs require a certified Historic Resources Survey and specified public notice/approval steps. See § 13B.8.1, § 13B.8.2, and § 13B.8.3 for the core framework .

This page explains the Los Angeles code (Chapter 1A) rules for HPOZs and Conservation Districts, how review works, key numeric thresholds, and where to verify parcel‑specific application of zoning and development rules in practice. For context about how preservation review interacts with the city's land‑use system, consult Los Angeles Zoning and Los Angeles Land Use; for impacts on driveway/parking layout consult Los Angeles Parking and for development metrics consult Los Angeles Development Standards. When a building permit is required you will also need to coordinate with the California Building Standards Code (Title 24).

What the ordinance is (high level)

• The Historic Preservation Overlay Zone (HPOZ) Supplemental District is the City’s local historic‑district tool. Its intent is to protect and enhance groups of buildings, structures, landscaping, natural features, and areas that have historic, architectural, cultural or aesthetic significance; it also requires compliance with CEQA procedures for HPOZ actions (§ 8.2.6 (HPOZ) and § 13B.8.2) .
• A separate but related tool is the Conservation District (CD), intended to protect surveyed historic resources that may not yet be designated historic; CDs apply targeted facade/roof/primary elevation controls (§ 8.2.7) .
• The city distinguishes work on Contributing Elements vs Non‑Contributing Elements, with different review paths: Certificate of Appropriateness for contributing elements and Certificate of Compatibility (or other conformity/exception paths) for non‑contributing elements (§ 13B.8.1; § 13B.8.5) .

District-by-district breakdown

HPOZ (Historic Preservation Overlay Zone)

• Purpose: Protect neighborhoods/areas with clustered historic resources and regulate exterior work to preserve character (§ 8.2.6) .
• Typical permitted uses: The underlying base zone’s uses remain in effect; the HPOZ is a supplemental district that layers review over existing use allowances (HPOZ does not itself create new base uses in code text) (§ 8.2.6; Div. 13B.8 general provisions) .
• Key review/thresholds and dimensional guidance:
  • Work that changes the exterior, including paint color, fencing, removal of significant trees, window/door replacement that affects character, and public space features are "projects" under the HPOZ rules (§ 8.2.6.B.1) .
  • Demolition is defined as removal of more than 50% of perimeter or roof framing or substantial removal of a street‑visible façade; demolition of contributing elements triggers the strictest review (§ 13B.8.1 definitions) .
  • A Certificate of Appropriateness is required for construction, additions over thresholds, demolition, reconstruction, alteration, removal, or relocation of any building/feature identified as a Contributing Element in the Historic Resources Survey (§ 13B.8.1 definition; § 13B.8.5) .
  • Review for Conforming Work (minor projects that meet preservation plan standards) is expected to be acted on by the Historic Preservation Board at its next agendized meeting within 21 days of a complete application unless extended or transferred (§ 13B.8.4) .
  • HPOZ establishment requires a certified Historic Resources Survey; owner‑initiated petitions must include signatures from at least 75% of Owners/lessees within the proposed district before a survey is prepared (§ 13B.8.2.B.2) .
• Where it applies: HPOZs are mapped as the third bracket in the zone string using the acronym HPOZ; specific preservation rules are implemented through a Preservation Plan for each HPOZ (§ 8.2.6.C.1; § 13B.8.3) .

Practical note: HPOZ review overlays the base zone’s numeric standards (setbacks, FAR, height) but projects must comply with both the base zone and the HPOZ preservation rules; if the Preservation Plan delegates review authority, the Director may sign off on some conforming work (§ 13B.8.4) .

(See the city’s Overlay Districts page for mapping and how the overlay appears in the zone string.)

Conservation District (CD)

• Purpose: Protect areas that are listed in an historic resources survey as eligible for designation, preserving integrity and eligibility for future designation (§ 8.2.7.A) .
• Typical permitted uses: The base zone uses remain; the CD adds façade/roof/primary elevation controls and additional review for surveyed resources (§ 8.2.7.B.1–2) .
• Key dimensional and scope limits:
  • CD standards apply to primary and secondary facades, to the peak of the highest roof ridge or 15‑foot depth, whichever is greater; they do not apply to accessory structures (§ 8.2.7.B.2) .
  • Where CDs conflict with the Zoning Code the Code generally prevails, but defined terms in the CD prevail over the general glossary when conflicts arise (§ 8.2.7.C.1–3) .
• Where it applies: Conservation Districts are supplemental districts adopted for specific surveyed areas; check the zoning map and the applicable Conservation District text for localized standards (§ 8.2.7) .

Historic‑Cultural Monument (City designation) — brief

• The Division states it does not supersede or override the authority of the Cultural Heritage Commission as provided in the Los Angeles Administrative Code (referenced at LAAC § 22.171 et seq.); detailed HCM procedures and powers are in that LAAC provision, not fully reproduced in the Chapter 1A excerpts here (see § 13B.8.1.E.3) .
• For code text regarding HCM nominations, findings, and protections see the Cultural Heritage Commission code (LAAC § 22.171 et seq.). Not found in retrieved materials: full HCM procedural text in LAMC chapter form within the provided files.

Key standards and decision triggers (quick table)

How review works (practical synthesis)

• Initiation and mapping: HPOZs are established by City Council, City Planning Commission, Director, Cultural Heritage Commission, or by owner/renter petition (owner petitions require 75% signatures) and must be supported by a certified Historic Resources Survey (§ 13B.8.2.B) .
• Preservation Plan: Each HPOZ has a Preservation Plan that sets the local standards and exemptions; the Preservation Plan is prepared/approved per § 13B.8.3 and may delegate Historic Preservation Board authority to the Director for certain conforming work (§ 13B.8.3; § 13B.8.4) .
• Application routing: On receipt of an application staff determines whether a project needs a Certificate of Appropriateness, Certificate of Compatibility, or qualifies as Conforming Work; all HPOZ projects (except enumerated exemptions) must be submitted to the Department of City Planning on its form (§ 13B.8.2.F.3) .
• Decision makers and appeals: Historic Preservation Boards review conforming work and make recommendations; Certificates of Appropriateness decisions include findings (standards listed in § 13B.8.5) and appeals may be reviewed by the Area Planning Commission (see § 13B.8.5.G for appeal procedure references) .
• Exemptions: Emergency repairs, certain public‑works improvements, work authorized by a Historical Property Contract, repair of structural elements without exterior change, and interior alterations that don’t alter exterior features are typical exemptions; Preservation Plans may add exemptions (§ 8.2.6.B.2; § 13B.8.1.C) .

Practical guidance: treat an HPOZ as an overlay that controls exterior visible character first; check the certified Historic Resources Survey to see whether your building is Contributing or Non‑Contributing (that classification determines the path) — the Survey is the controlling inventory (§ 13B.8.2.B.3) .

Checklist

• Identify whether the parcel is inside an HPOZ or Conservation District and obtain the applicable Preservation Plan and Historic Resources Survey (§ 13B.8.2; § 13B.8.3) .
• Confirm whether the subject element is listed as a Contributing Element or Non‑Contributing Element in the certified Historic Resources Survey (§ 13B.8.1 definition) .
• Determine whether proposed work is exempt under the Preservation Plan or HPOZ exemptions (emergency work, certain public works, HCM/Historical Property Contract exceptions) (§ 8.2.6.B.2) .
• If not exempt, identify required application: Conforming Work route, Certificate of Appropriateness, or Certificate of Compatibility; prepare materials to show compliance with Preservation Plan or Secretary of the Interior standards (§ 13B.8.4; § 13B.8.5) .
• File with Department of City Planning on the required form and pay any project survey/decision fees; for an HPOZ designation petition confirm 75% owner/lessee signatures if owner‑initiated (§ 13B.8.2.B.2) .
• Track Historic Preservation Board schedule (Conforming Work: 21‑day target) and be ready to request jurisdiction transfer to the Director if the Board fails to act within the time window (§ 13B.8.4.D.3) .
• If a demolition is proposed, assess the >50% threshold for demolition and prepare the highest level of justification and CEQA analysis (§ 13B.8.1 definitions) .
• If appeals or higher‑level review are possible, identify the appellate body (Area Planning Commission) and related appeal deadlines (§ 13B.8.5.G) .

Also coordinate with Los Angeles Development Standards, Los Angeles Parking, and Los Angeles Design Review early if your project includes changes that interact with setbacks, parking counts, frontage or design guidelines.

Risks & Ambiguities

Plain-English Summary

If your property lies in a Los Angeles Historic Preservation Overlay Zone, almost any visible exterior change may require city review: small, clearly conforming projects can be signed off quickly, but demolitions, major additions, or changes to contributing buildings generally require a formal Certificate of Appropriateness and must satisfy the Preservation Plan or Secretary of the Interior standards. Check the certified Historic Resources Survey to see if your building is Contributing and get the HPOZ’s Preservation Plan before you design work (§ 13B.8.1–.5) .

Source References

• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — Historic Preservation: § 13B.8.1 (General Provisions)
• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — § 13B.8.2 (Historic Preservation Overlay Zone Designation)
• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — § 13B.8.3 (Preservation Plan Adoption/Amendment)
• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — § 13B.8.4 (Review of Conforming Work)
• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — § 13B.8.5 (Certificate of Appropriateness)
• Historic Preservation Overlay Zone supplemental district text — § 8.2.6 (HPOZ intent, applicability, exemptions)
• Conservation District rules — § 8.2.7 (Conservation District (CD))

Also consult these GoCodebook pages for coordination topics (linked where first referenced above): Los Angeles Zoning, Los Angeles Land Use, Los Angeles Development Standards, Los Angeles Parking, Los Angeles Design Review, Los Angeles Overlay Districts, Los Angeles ADUs, and the California Building Standards Code (Title 24).

Retrieved passages

• Los Angeles Zoning Code (ARTICLE 13) High relevance show source text
• Los Angeles Zoning Code (ARTICLE 13) High relevance show source text
• Los Angeles Zoning Code (ARTICLE 13) High relevance show source text
• Los Angeles Zoning Code (ARTICLE 13) High relevance show source text
• Los Angeles Zoning Code (ARTICLE 8) High relevance show source text
• Los Angeles Zoning Code (ARTICLE 13) High relevance show source text
• Los Angeles Zoning Code (ARTICLE 13) High relevance show source text
• Los Angeles Zoning Code (ARTICLE 13) High relevance show source text

Cited sections

• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — Historic Preservation: **§ 13B.8.1** (General Provisions) (Chapter 1A)
• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — **§ 13B.8.2** (Historic Preservation Overlay Zone Designation) (Chapter 1A)
• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — **§ 13B.8.3** (Preservation Plan Adoption/Amendment) (Chapter 1A)
• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — **§ 13B.8.4** (Review of Conforming Work) (Chapter 1A)
• Los Angeles Zoning Code (Chapter 1A), Division 13B.8 — **§ 13B.8.5** (Certificate of Appropriateness) (Chapter 1A)
• Historic Preservation Overlay Zone supplemental district text — **§ 8.2.6** (HPOZ intent, applicability, exemptions) (§ 8.2.6)
• Conservation District rules — **§ 8.2.7** (Conservation District (CD)) (§ 8.2.7)
• LA City Zoning Code Chapter 1A.md

• Official Los Angeles code library