Local zoning · Duarte
Duarte — Historic Preservation
Historic Preservation under the Duarte local zoning and planning code, with the controlling citations.
Last reviewed: July 2, 2026
Overview
The Duarte Development Code does not implement a stand‑alone historic‑preservation chapter or a mapped local historic overlay in the materials retrieved. Instead, Duarte treats historic resources as constraints that affect other land‑use processes: they are explicit disqualifiers for some ministerial housing programs (urban lot splits and duplexes), they trigger (or are a factor in) design review and development‑standard exceptions, and they qualify ADUs for parking exceptions. See the Development Code provisions on Site Plan and Design Review, Duplexes, Urban Lot Splits, and Accessory Dwelling Units for the operative rules. § 19.122.030, § 19.10.035, § 19.88, and § 19.60 (respectively) are the controlling local references .
NOTE: this page covers only what the Duarte Development Code says about historic resources and how that affects zoning/land‑use review. For building code or Title 24 compliance, consult the California building code resources linked below.
What the Duarte Development Code actually says (core rules)
- Historic properties/districts are explicitly excluded from ministerial urban lot split and duplex approvals — a parcel that "is a historic property or within a historic district that is included on the State Historic Resources Inventory" or "designated by ordinance as a City or County landmark" is ineligible for those streamlined processes (§ 19.88; § 19.10.035) .
- The City’s Site Plan and Design Review process may be applied and elevated where projects could affect historic or character‑defining features; design review standards must be satisfied and can be escalated to the Architectural Review Board, Commission, or City Council (§ 19.122.030, § 19.122.050) .
- The ADU rules give a parking exemption when an ADU is located within a historic district (one of the ADU parking exceptions is "The ADU is located within a historic district") — ADU development standards and exemptions are in Chapter 19.60 (§ 19.60.010—19.60.190) .
- Where the Development Code refers to "historic landmarks" or "natural features (e.g., historic landmarks...)" those elements are to be identified in plans and considered in site design (e.g., Chapter 19.32 site‑planning standards and subdivision/condominium review) (§ 19.32.010; § 19.83.040) .
- There is no standalone local ordinance text in the retrieved materials describing procedures for designating City landmarks or a local historic register (text that would set up nomination, survey, or designation criteria was Not found in retrieved materials). Verify with the jurisdiction for any separate municipal landmark ordinance or registry. Not found in retrieved materials.
(Primary source locations in the Duarte Development Code: § 19.122.010—.060 for design review; § 19.10.035 for duplexes; § 19.88 for urban lot splits; § 19.60.010—.190 for ADUs.)
District-by-district (how historic rules interact with Duarte districts)
Below are Duarte districts where historic‑resource rules appear or most commonly matter. Each subsection cites the Code sections that set the district purpose/standards and the specific historic‑resource rule that applies.
R-1 (single‑family zones: R-1, R-1A, R-1B, R-1D, R-1E, R-1F)
- Purpose: intended for detached single‑family homes and accessory uses; minimum lot sizes vary by subzone (§ 19.10.010—19.10.090). Key development standards (front setbacks, side/rear, lot area, lot coverage) are in the R‑zone tables (§ 19.10.* tables) .
- Typical permitted uses: single‑family dwellings (P), accessory structures, accessory dwelling units (ADUs) as allowed (§ 19.10 tables and notes) .
- Historic‑resource effect: duplex conversions and urban lot splits in R‑1 areas are allowed only if the lot is NOT a historic property or within a historic district — see Duplex rules (§ 19.10.035) and Urban Lot Split chapter (§ 19.88) for the exclusion language .
- Key dimensional standards (decision‑relevant): front setback typically 20 ft, side 5 ft (interior), rear 10 ft for single‑story; lot coverage 35% typical (see Table and § citations) — confirm per subzone in Table 2‑1 / § 19.10.010—.090 .
R-2 (two‑family — R-2)
- Purpose & uses: medium density two‑family or small multi‑family; duplexes allowed per duplex rules; ADUs governed by Chapter 19.60 (§ 19.10 tables) .
- Historic‑resource effect: same statutory exclusion for ministerial duplex approval where site is a historic property/district (§ 19.10.035) .
- Dimensional standards: see R‑zone tables; setbacks, lot sizes listed in § 19.10 tables .
R-3 / R-4 (multi‑family — R-3, R-4)
- Purpose & uses: medium/high density multi‑family; Site Plan & Design Review is commonly required for new/expanded multi‑family projects (Table 7‑2) (§ 19.10 tables; § 19.122) .
- Historic‑resource effect: projects that may affect identified historic landmarks or district character are evaluated through the Site Plan and Design Review process and may be elevated to ARB/Commission review (§ 19.122.030—.050) .
- Dimensional standards: floor‑area, height and lot coverage limits set in the multi‑family standards tables; consult Table 2‑4 / § 19.10 for precise numbers .
Public / Institutional / Specific Plan areas (PF, I, Specific Plans)
- Purpose & uses: institutional and public facilities have their own development standards; site design standards require consideration of "natural features (e.g., historic landmarks...)" in plans (§ 19.18.040; § 19.22.040) .
- Historic‑resource effect: Specific Plans can include special rules for preservation; otherwise design review and other chapters apply (§ 19.22.040; § 19.122) .
Quick decision‑relevant table (selected standards / historic links)
| Rule / question | Short answer | Code reference |
|---|---|---|
| Are urban lot splits permitted on historic properties? | No — a lot that "is a historic property or within a historic district" is ineligible for urban lot split treatment. | § 19.88; see urban lot split provisions |
| Are duplex ministerial approvals allowed on historic lots? | No — duplex ministerial approval requires the lot NOT be a historic property or within a historic district. | § 19.10.035 (Duplexes) |
| Does Duarte prohibit ADUs in historic districts? | No — ADUs are allowed; ADUs located in historic districts qualify for certain parking exemptions. | § 19.60.010—.190; ADU parking exceptions (§ 19.60.*) |
| Who reviews design when historic resources are involved? | Site Plan & Design Review; decision authority follows Table 7‑2 (Staff / Director / ARB / Commission). | § 19.122.030—.050 |
| Which R‑zone setbacks/lot coverage apply when a project touches a historic resource? | The underlying zone standards apply (e.g., R‑1 setbacks/coverage in § 19.10 tables); design review must consider historic features. | § 19.10 tables; § 19.122; § 19.32 (site design) |
Practical guidance / interpretation (plain‑English how to act)
- If you own or propose work on a property that is listed on the State Historic Resources Inventory, or has been designated by ordinance as a City/County landmark, assume you cannot use Duarte’s ministerial shortcuts for urban lot splits or duplex ministerial approvals (those programs expressly exclude historic parcels) — check § 19.88 and § 19.10.035 early in project planning and state that status on your application .
- If your work affects exterior form, materials, or siting of a building in a candidate historic area, expect design review under the Site Plan and Design Review rules; the process may be elevated to the Architectural Review Board or Commission (§ 19.122.030—.050) .
- For ADUs, Duarte’s ordinance allows ADUs in historic districts and specifically lists "located within a historic district" as a condition that can waive an extra parking space (§ 19.60.*) — still meet the objective design and dimensional ADU standards in Chapter 19.60 § 19.60.010—.190 .
- The Code instructs applicants to identify historic landmarks and other natural features on development plans so those features are considered during site layout (§ 19.83.040; Chapter 19.32) .
Checklist — what an applicant must provide (minimum)
- Confirm whether the parcel is on the State Historic Resources Inventory or is designated by ordinance as a City/County landmark; disclose on application (urban lot split / duplex ineligibility applies) — § 19.88; § 19.10.035 .
- Complete the Site Plan & Design Review submittal package where applicable (see Table 7‑2 for review authority) — § 19.122.040—.050 .
- For ADUs, show compliance with Chapter 19.60 standards and indicate if the ADU sits in a historic district to claim the parking exception — § 19.60.010—.190 .
- Include drawings that identify "natural features (e.g., historic landmarks, slopes, and/or trees)" on the site plan; show how the proposal preserves or mitigates impacts — § 19.83.040; § 19.32.010 .
- Be prepared for escalation to ARB/Commission if project is controversial or affects historic character — § 19.122.030—.050 .
- Verify any special rules or mapping that may exist outside the Development Code (city resolutions or separate landmark ordinances) — Not found in retrieved materials; verify with the City of Duarte.
Risks & Ambiguities
| Issue | Why it matters | What to verify |
|---|---|---|
| Local landmark designation process | The Development Code references "designated by ordinance as a City or County landmark" but a dedicated designation procedure is not present in the retrieved code | Verify whether Duarte has a separate landmark ordinance or resolution or an adopted register (Not found in retrieved materials) |
| Exact map of historic districts | Several rules refer to "historic district" (e.g., ADU parking exemption); absent a local map, applicants can't know eligibility | Confirm with City whether a local historic district map or GIS layer exists (Not found in retrieved materials) |
| Which review body will decide? | Site Plan & Design Review may be elevated; process and timeline differ depending on review authority | Check Table 7‑2 and the Director's discretionary referral authority; expect ARB or Commission elevation for significant historic impacts (§ 19.122.030—.050) |
| State vs. local historic lists | Duarte code references the State Historic Resources Inventory as a disqualifier for ministerial programs — state listing and local listing differ | Verify whether the site is on the State list and whether the City maintains its own list; if in doubt, ask the Community Development Department (§ 19.88; § 19.10.035) |
Plain‑English Summary
Duarte does not have a single historic‑preservation chapter in the Development Code; instead historic properties are treated as a limiting condition that prevents use of some streamlined housing approvals (urban lot splits and ministerial duplexes), and historic resources are a factor in design review and ADU parking rules. If your parcel is state‑listed or ordinance‑designated as historic, you must plan for discretionary design review and cannot rely on the ministerial shortcuts in § 19.88 and § 19.10.035; ADUs remain allowed but certain ADU parking relief is available under § 19.60 .
Source References
- Duarte Development Code — Chapter 19.122 (Site Plan and Design Review): § 19.122.030, § 19.122.050 (review authority and findings) .
- Duarte Development Code — Duplex developments: § 19.10.035 (Duplex Developments in Single‑Family Residential Zones) .
- Duarte Development Code — Urban Lot Split chapter (urban lot split rules; historic exclusion): § 19.88 (Urban Lot Splits / chapter text) .
- Duarte Development Code — ADU rules and parking exceptions: § 19.60.010—19.60.190 (ADU development standards; parking exception for ADUs in historic districts) .
- Duarte Development Code — Site planning and natural features (historic landmarks referenced): § 19.32.010 and subdivision/condominium review references (§ 19.83.040) .
- Duarte Development Code — Residential zone development standards tables and setback/lot coverage numbers: Chapter 19.10 (Tables, notes) .
- Duarte Development Code — Index and chapter list (for locating chapters referenced above) .
Internal links (first natural mention of each topic in the page): Duarte’s zoning overview, design review, ADUs, parking, development standards, overlay districts, and California building codes are at Duarte site pages: Duarte zoning & planning overview, Duarte Zoning, Duarte Design Review, Duarte ADUs, Duarte Parking, Duarte Development Standards, Duarte Overlay Districts, and California Building Standards Code.
Sources
Retrieved passages
- Duarte Zoning Code (Chapter is) Medium relevance
- CBC § 66300 (Section 66300) Medium relevance
- Duarte Zoning Code (section of) Medium relevance
- Duarte Zoning Code (Chapter 19.40) Medium relevance
- Duarte Zoning Code Medium relevance
- CBC § 8 (SECTION 8-301) Medium relevance
- Duarte Zoning Code (section of) Medium relevance
- Duarte Zoning Code (Chapter 19.40) Medium relevance
- Duarte Zoning Code (chapter required.) Medium relevance
- Duarte Zoning Code (Section 19.120.060) Medium relevance
- Duarte Zoning Code Medium relevance
- CBC § G106 (SECTION G106) Medium relevance
- Duarte Zoning Code (Section 65913.4) Medium relevance
- Duarte Zoning Code (§ 65915) Medium relevance
- Duarte Zoning Code (§ 66314) Medium relevance
- CBC § 402.1 (Section 402.1) Medium relevance
- Duarte Zoning Code (Chapter 19.38) Medium relevance
- CBC § 65852.2 (section 65852.2) Medium relevance
- Duarte Zoning Code Medium relevance
- Duarte Zoning Code (ARTICLE 1) Medium relevance
- Duarte Zoning Code (Chapter shall) Medium relevance
- Duarte Zoning Code Medium relevance
- Duarte Zoning Code (Chapter 19.18) Medium relevance
- Duarte Zoning Code (Article 9) Medium relevance
- Duarte Zoning Code (Chapter 19.32.) Medium relevance
- Duarte Zoning Code (Section 66456.2.) Medium relevance
- Duarte Zoning Code (Section 19.148.050) Medium relevance
- CBC § 19.010.035 (Chapter 19.40) Medium relevance
- Duarte Zoning Code (Chapter 19.40) Medium relevance
- Duarte Zoning Code (Article 7) Medium relevance
- CBC § 4 (Chapter 19.118) Medium relevance
- CBC § 66300 (Section 66300) Medium relevance
- Duarte Zoning Code (Article 7) Medium relevance
- Duarte Zoning Code (Section 65450) Medium relevance
- Duarte Zoning Code (§ 4) Medium relevance
Cited sections
- Duarte Development Code — Chapter 19.122 (Site Plan and Design Review): **§ 19.122.030**, **§ 19.122.050** (review authority and findings) . (Chapter 19.122)
- Duarte Development Code — Duplex developments: **§ 19.10.035** (Duplex Developments in Single‑Family Residential Zones) . (§ 19.10.035)
- Duarte Development Code — Urban Lot Split chapter (urban lot split rules; historic exclusion): **§ 19.88** (Urban Lot Splits / chapter text) . (§ 19.88)
- Duarte Development Code — ADU rules and parking exceptions: **§ 19.60.010—19.60.190** (ADU development standards; parking exception for ADUs in historic districts) . (§ 19.60.010)
- Duarte Development Code — Site planning and natural features (historic landmarks referenced): **§ 19.32.010** and subdivision/condominium review references (§ 19.83.040) . (§ 19.32.010)
- Duarte Development Code — Residential zone development standards tables and setback/lot coverage numbers: **Chapter 19.10** (Tables, notes) . (Chapter 19.10)
- Duarte Development Code — Index and chapter list (for locating chapters referenced above) . (chapter list)
- Duarte_ZoningCode.md
Frequently asked questions
What happens if my Duarte parcel is listed on the State Historic Resources Inventory?
If the parcel is on the State Historic Resources Inventory, Duarte’s streamlining programs for urban lot splits and ministerial duplex approvals do not apply — the Code requires that lots eligible for those ministerial approvals NOT be historic properties or within a historic district (see § 19.88; § 19.10.035) .
Can I build an ADU on a Duarte property that is in a historic district?
Yes. Duarte’s ADU chapter allows ADUs in historic districts and lists "ADU located within a historic district" as one of the circumstances that can waive the required additional parking for an ADU; ADUs must still meet Chapter 19.60 objective ADU standards (§ 19.60.010—.190) .
Do I need Site Plan and Design Review for work that affects a historic building or streetscape?
Likely yes — the Site Plan and Design Review procedures apply to projects that change exterior site or building characteristics and the Director/ARB/Commission can consider historic character as part of the required findings (§ 19.122.030; § 19.122.050) .
Are there local Duarte landmark procedures or a local historic register in the Development Code?
A municipal designation mechanism (nomination/designation procedure text or a local register) was Not found in the retrieved Development Code materials; the Code does reference properties "designated by ordinance as a City or County landmark" but does not include a complete designation chapter in the retrieved text — Verify with the City for any separate landmark ordinance or register (Not found in retrieved materials) .
If my lot is historic, can I ever get an urban lot split or duplex approval in Duarte?
Not under the ministerial urban lot split or ministerial duplex provisions — the Code expressly excludes historic properties/districts from those ministerial tracks; a different discretionary path or an amendment (e.g., zoning map/code amendment) would require formal review and findings (§ 19.88; § 19.10.035) .
Which Duarte zone setbacks and lot‑coverage numbers apply when the project touches or includes a historic resource?
The underlying zone standards apply (for example, R‑1 setbacks/lot coverage per Chapter 19.10 tables); however, design review and site planning (Chapter 19.32 / § 19.122) will evaluate impacts on historic features and may impose conditions to preserve character (§ 19.10 tables; § 19.32.010; § 19.122) .
Does Duarte map "historic districts" in the Development Code?
A map or list of local historic districts was Not found within the retrieved Development Code materials. The Code repeatedly references "historic district" (for example in ADU and urban lot split rules) but does not, in the retrieved materials, provide a mapped local historic district layer. Verify with the Community Development Department or City Clerk for any adopted maps (Not found in retrieved materials) .
Do design standards require preserving specific historic materials or details?
Duarte’s code requires that façades visible from the public right‑of‑way incorporate compatible architectural elements and that natural/historic features be shown and preserved where possible; detailed preservation treatments are handled through design review or a specific plan and the review authority's findings (§ 19.32.010; § 19.83.040; § 19.122.050) .
If a property is eligible for the California Register but not locally designated, does Duarte treat it as "historic" for these rules?
The Code's disqualifying language references the State Historic Resources Inventory and ordinance designations; state eligibility or listing is commonly relevant. If you believe your property is state‑eligible, flag that early — the City treats State inventory listings as part of the "historic" constraint in the urban lot split/duplex rules (§ 19.88; § 19.10.035) . ---
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