Duarte — Development Standards

Last reviewed: July 2, 2026

Overview

This page summarizes the City of Duarte Development Code rules that control development standards (setbacks, heights, lot coverage, density/FAR where applicable) for each local zoning district and special overlay. It is grounded in the Duarte Development Code (Title 19) and summarizes the decision‑relevant numbers and where they live in the code. For process topics referenced here (e.g., parking, design review, ADUs, or overlays) follow the linked topic pages for separate, detailed guidance.

Key rules that apply citywide (short list)

• No habitable structure within 40 feet of a freeway or railroad right‑of‑way (exceptions for transit‑oriented projects) — § 19.10.030 .
• Projections into required setbacks are governed by § 19.32.020 and yard measurement rules in § 19.32.050 .
• Accessory structures count toward lot coverage and have their own setbacks in Chapter 19.34 .
• Planned Development Permits may modify numeric envelope standards except they cannot increase base density except as allowed under density‑bonus rules — § 19.118.020 .
• Affordable Housing Overlay development standards (density, height, setbacks, open space, parking) are in § 19.26.050 .

(Links used above: Duarte Zoning & Planning overview, Duarte Parking, Duarte Design Review, Duarte Overlay Districts, Duarte ADUs, California Building Standards Code.)

District-by-district breakdown

Notes on methodology: Duarte organizes residential zones in Chapter 19.10 and provides the numeric tables as Table 2‑3 (single‑family/two‑family) and Table 2‑4 (multi‑family). The narrative below condenses those tables and the accompanying text; each numeric item cites the controlling code section(s).

R-1 / R-1A / R-1B / R-1D / R-1E / R-1F — Single‑Family Residential (very low to low density)

Purpose & where it applies: the R-1 family of zones implements the General Plan low‑density categories and is described in § 19.10.010; minimum lot sizes vary by subzone (R‑1 = 6,500 sf; R‑1A = 7,500 sf; R‑1B = 10,000 sf; R‑1D/E/F = larger) .

Typical permitted uses: single‑family dwellings (P); two‑family (duplex) allowed in many R‑1 subzones per the duplex rules — see § 19.10.020 and § 19.10.035 .

Key dimensional standards (summary from Table 2‑3 and related text):

• Front setback: minimum 20 ft (measured consistently with the block average) — 30 ft minimum in R‑1F; cannot be reduced below 20 ft except R‑1F (30 ft) — § 19.10.030 .
• Side interior setback: typically 5 ft (some hillside or R‑1D exceptions increase side yards) — § 19.10.030 .
• Rear setback: single‑story 10 ft, two‑story 20 ft (varies where accessory‑structure rules apply) — § 19.10.030 and Chapter 19.34 .
• Lot coverage (max): base 35% for R‑1/R‑1A (up to 40% for single‑story on lots ≤ 8,000 sf); special low coverage limits for R‑1F (one‑story 12.5%, two‑story 10%) — § 19.10.030 .
• Height: typically 35 ft or 2 stories (whichever is less) for most R‑1 subzones; see Chapter 19.32.040 for measurement rules — § 19.10.030; § 19.32.040 .

Practical guidance: Verify whether a lot is in a hillside area (R‑1D, R‑1F notes) because Chapter 19.46 adds additional restrictions; accessory buildings and ADUs have separate but related rules (Chapter 19.34 and the ADU section) — see § 19.10.090 and § 19.34 .

R-2 — Two‑Family / Medium Density Residential

Purpose & uses: medium‑density (7–11 du/ac) for cohesive one‑ or two‑family attached/detached developments — § 19.10.010 / § 19.10.020 .

Key standards (Table 2‑3):

• Front setback: 20 ft (or block average rule) — § 19.10.030 .
• Side interior: 5 ft; corner: 10 ft — § 19.10.030 .
• Rear: 10 ft single‑story / 20 ft two‑story — § 19.10.030 .
• Lot coverage: typically 35% (with some flexible rules for single‑story on small lots) — § 19.10.030 .
• Height: generally 35 ft or 2 stories — see § 19.32.040 for measurement .

R-3 / R-4 — Multi‑Family Residential (medium to high density)

Purpose & where it applies: R‑3 and R‑4 accommodate multi‑family development; density, lot area, setbacks and lot coverage are spelled out in Table 2‑4 — § 19.10.020 / § 19.10.030 .

Key standards (from Table 2‑4):

• Density (maximum): R‑3 = 1 unit per 2,074 sf; R‑4 = 1 unit per 1,556 sf (see Table 2‑4) — § 19.10.030 .
• Front setback: 30 ft in both R‑3 and R‑4 — § 19.10.030 .
• Side interior: 5 ft; corner (street side): 10 ft; reverse corner: 15 ft — § 19.10.030 .
• Rear setback: 25 ft where abutting R‑1; 20 ft otherwise — § 19.10.030 .
• Lot coverage (max): 50% (R‑3), 60% (R‑4) — § 19.10.030 .
• Height: R‑3 = 40 ft / 3 stories max; R‑4 = 50 ft / 4 stories max. The Code allows a CUP to grant additional height up to 70 ft in limited circumstances; height measurement exceptions in § 19.32.040 apply — § 19.10.030; § 19.32.040 .

Practical guidance: multi‑family proposals should confirm density calculations early and consider State density bonus rules (Chapter 19.64) if proposing affordability incentives; see the Affordable Housing Overlay rules below for overlay‑specific departures — § 19.64 and § 19.26.050 .

R‑MH — Mobile Home Residential

Purpose & uses: mobile home parks and accessory uses only; development standards in Table 2‑4 apply with specific mobile‑home provisions and Site Plan/CUP requirements — § 19.10.020 and Table 2‑4 .

Key standards:

• Density: calculated as one mobile home per 800 sf of site area per Table 2‑4 — § 19.10.030 .
• Setbacks: front 30 ft, side/rear per table; height limited to single‑story mobile home standard (15 ft / 1 story) — § 19.10.030 .

Commercial zones — C‑P / C‑G / C‑F

Purpose & uses: three commercial zones provide for professional, general retail/services, and freeway‑oriented commercial activity; each zone’s allowed uses and zone‑specific standards are in Chapter 19.12 and Table 2‑5 — § 19.12.010 – .020 .

Key standards and notes:

• Commercial development standards (setbacks, height, lot coverage) vary by zone and specific use; see Table 2‑5 and relevant chapters for sign and landscaping requirements (Chapters 19.42 and 19.40) — § 19.12.020, Chapters 19.40, 19.42 .
• Freeway‑adjacent C‑F sites often have larger lot, setback, and parking requirements to support auto‑oriented uses — confirm against Table 2‑5 and site‑specific specific plans (Table 2‑15) — § 19.22.050 .

Affordable Housing Overlay (AHO)

Where and why: the AHO creates an overlay strategy for identified opportunity sites and sets alternate development standards to encourage affordable housing — see § 19.26.030 – .060 .

AHO development standards (summary of § 19.26.050):

• Density: base 20–30 du/acre; projects providing certain affordable mixes may access automatic State density increases (up to an 80% increase under State law) — § 19.26.050.1 .
• Height: maximum 50 ft / 4 stories; buildings taller than three stories fronting public streets must include height modulation and an average setback of 12 ft for stories above the third — § 19.26.050.2–3 .
• Setbacks: front 10 ft minimum; side 5 ft; rear 10 ft — § 19.26.050.3 .
• Open space & parking: minimum open space 125 sf/unit; parking requirements generally follow the underlying zone except AHO specifies parking ratios by unit size — § 19.26.050.4–5 .

Important: AHO standards are additive to underlying objective standards but where the AHO conflicts with other Code provisions the AHO governs for sites in the overlay — § 19.26.050.6 .

Quick reference table: decision‑relevant numeric standards

Use this table only as a quick screen; confirm parcel‑level applicability (hillside rules, specific plans, easements, alleys) because the Code adds many special‑case adjustments — see § 19.10.090 and adopted specific plans in Table 2‑15 .

Practical links in the code you’ll use early

• If you expect to need reductions/adjustments to setbacks, consult the Variances and Administrative Variances chapter (Chapter 19.126) and the Planned Development chapter 19.118 — § 19.126.020, § 19.118.020 .
• ADU applicants: local ADU standards and exceptions are in Chapter 19.60.160; State ADU law also constrains local limits — see the ADU page and § 19.60.160 .
• Parking rules referenced by many standards live in Chapter 19.38 — consult the parking page for practical application and the off‑street parking chapter for ratios § 19.38 .

(First time each of the linked words above appears, it is linked: Duarte Zoning & Planning overview, Duarte Zoning, Duarte Land Use, Duarte Parking, Duarte Design Review, Duarte Overlay Districts, Duarte ADUs, California Building Standards Code.)

Checklist — what an applicant must satisfy (pre‑application / entitlement screen)

• Confirm the zoning district and any overlay (check the zoning map and Table 2‑15 for specific plans). Verify hillside / special area limits — § 19.10.010 / § 19.22.050 .
• Confirm basic numeric envelope: front/side/rear setbacks, lot coverage, height, and density from Table 2‑3 or Table 2‑4 — § 19.10.030 .
• Check accessory structure setbacks and contribution to lot coverage (Chapter 19.34) — § 19.34 .
• Determine parking requirement per Chapter 19.38 and check proximity exceptions (transit, car‑share, historic district) — § 19.38 .
• If requesting adjustments to numeric standards, prepare findings and enhanced amenity proposals for a Planned Development Permit or a Variance — § 19.118.020 / § 19.126.020 .
• If proposing affordable housing on an AHO site, align the project with § 19.26.050 density, height and open‑space rules and prepare density bonus documentation if applicable — § 19.26.050 .
• For ADUs, review Chapter 19.60.160 and State ADU law; note parking and height exceptions — § 19.60.160 .
• Coordinate design review (objective standards in Chapter 19.44) and neighborhood noticing early — see Duarte Design Review and § 19.44 .

Risks & Ambiguities

Plain‑English summary

Duarte’s Development Code sets district‑specific numeric envelopes (front/side/rear setbacks, lot coverage, heights and densities) in Tables 2‑3 and 2‑4 and supplements those tables with chapter rules for accessory structures, projections, and measurement. Hillside parcels, adopted specific plans, and the Affordable Housing Overlay can change the numbers; if you need an adjustment you must use Planned Development or Variance procedures and justify the change — see § 19.10.030, § 19.118.020, and § 19.26.050 .

Source References

• Duarte Development Code (Title 19), Chapter 19.10 (Residential zones), incl. § 19.10.020 and § 19.10.030 (development tables and rules) — § 19.10.030 .
• Table 2‑3 (Development Standards for Single‑Family and Two‑Family Residential Zones) — table and commentary in Chapter 19.10 (see Table 2‑3) — .
• Table 2‑4 (Development Standards for Multi‑Family Residential Zones) and related height/density notes — Chapter 19.10 — .
• Chapter 19.34 (Accessory Structures) — accessory setbacks and counting toward lot coverage — .
• Chapter 19.32 (Site Planning and General Development Standards) — permitted projections, yard measurement, height measurement exceptions (§ 19.32.020, § 19.32.040, § 19.32.050) — .
• Affordable Housing Overlay (AHO) development standards — § 19.26.050 — .
• Planned Development Permit authority to modify numeric standards — § 19.118.020 — .
• ADU local standards and parking exceptions — Chapter 19.60 (see § 19.60.160) and ADU notes — .
• Code index and article list (Development Code Preface / Article 2) — Title 19 index — .

If you want, I can pull the exact numeric cell for a single parcel: provide the parcel address or APN and I’ll confirm the zone, overlays, and the specific table row that applies. Verify with the City for parcel‑specific interpretations.

Retrieved passages

• CBC § 4 (Chapter 19.118) High relevance show source text
• Duarte Zoning Code (Article 7) High relevance show source text
• Duarte Zoning Code High relevance show source text
• Duarte Zoning Code (§ 4) High relevance show source text
• Duarte Zoning Code (§ 4) High relevance show source text
• Duarte Zoning Code (Chapter shall) High relevance show source text
• CBC § 19.10.040 (Chapter 19.46) High relevance show source text
• CBC § 66321 (§ 66321) High relevance show source text
• Duarte Zoning Code High relevance show source text
• Duarte Zoning Code (Section 19.010.035) High relevance show source text
• Duarte Zoning Code (§ 2) High relevance show source text
• Duarte Zoning Code (Chapter 19.34) High relevance show source text
• Duarte Zoning Code (§ 4.A.) Medium relevance show source text
• Duarte Zoning Code (§ 66317) Medium relevance show source text

Cited sections

• Duarte Development Code (Title 19), Chapter 19.10 (Residential zones), incl. **§ 19.10.020** and **§ 19.10.030** (development tables and rules) — **§ 19.10.030** . (Title 19)
• Table 2‑3 (Development Standards for Single‑Family and Two‑Family Residential Zones) — table and commentary in Chapter 19.10 (see Table 2‑3) — . (Chapter 19.10)
• Table 2‑4 (Development Standards for Multi‑Family Residential Zones) and related height/density notes — Chapter 19.10 — . (Chapter 19.10)
• Chapter 19.34 (Accessory Structures) — accessory setbacks and counting toward lot coverage — . (Chapter 19.34)
• Chapter 19.32 (Site Planning and General Development Standards) — permitted projections, yard measurement, height measurement exceptions (**§ 19.32.020**, **§ 19.32.040**, **§ 19.32.050**) — . (Chapter 19.32)
• Affordable Housing Overlay (AHO) development standards — **§ 19.26.050** — . (§ 19.26.050)
• Planned Development Permit authority to modify numeric standards — **§ 19.118.020** — . (§ 19.118.020)
• ADU local standards and parking exceptions — Chapter **19.60** (see **§ 19.60.160**) and ADU notes — . (§ 19.60.160)
• Code index and article list (Development Code Preface / Article 2) — Title 19 index — . (article list)
• Duarte_ZoningCode.md

• Official Duarte code library