Antioch — Development Standards

Last reviewed: July 1, 2026

Overview

This page distills the development standards that apply under the City of Antioch’s Title 9, Chapter 5 Zoning Ordinance, with a focus on setbacks, height, lot coverage, and residential density by zoning district. It complements the broader Antioch zoning & planning overview and the use-permitted matrix in the citywide Antioch Land Use table, and links out to related topics like Antioch Parking and Antioch Design Review. All bullets below cite the controlling sections so you can verify details before designing a site plan.

How Antioch organizes dimensional standards

• The core dimensional rules (maximum building height, minimum lot size/width, maximum lot coverage, minimum setbacks, and density ranges) are consolidated in the city’s Height and Area Regulations table, adopted in § 9-5.601 (Table 9-5.601). Read your zone row, then apply any lettered footnotes that appear in the table cell for your standard.
• Citywide footnotes that commonly control projects:
  • Front yard averaging in established blocks: where 40%+ of a block frontage is improved, the minimum front yard is the average of improved lots, but never less than 6 ft (footnote a).
  • Height is measured from the average grade under the building footprint to the roof’s highest point, with limited exceptions for spires, towers, and small penthouses (footnote b).
  • Minimum lot area rules do not apply to condo parcelization of larger projects (footnote c).
  • Graduated front/street-side setbacks are tied to street type and land use (footnote f). See “Setbacks by Street Type,” below.
  • Garages in any residential district must be set back at least 20 ft from the property line they face (footnote k).
  • Townhome projects (each unit on its own lot) may use a minimum 1,800 sq ft lot with a 0 ft interior side setback (footnote l).
  • Where multi-family abuts RR, RE, R-4, or R-6, provide a minimum 20 ft rear yard (footnote m).

Setbacks by Street Type (footnote f)

• Nonresidential uses: Arterial 30 ft landscaped; Collector 25 ft landscaped; Local 20 ft landscaped.
• Single-family and two-family: Arterial 30 ft landscaped; Collector 25 ft front and 10 ft street-side; Local 20 ft front and 10 ft street-side (both landscaped).
• Multi-family: Arterial 15 ft landscaped; Collector 15 ft landscaped; Local 10 ft landscaped.

Accessory buildings and legally established setbacks

• Accessory buildings in residential districts: max height 15 ft; must stay behind the required front yard; max coverage is 40% of the required rear yard; min side yard 5 ft (interior) and 20 ft (corner); rear yard 5 ft (or 10 ft for double-frontage lots). Portable sheds meeting size/height utilities criteria are exempt from setback rules in the rear yard. § 9-5.603.
• If a side/rear yard line on your lot has a legally established setback that’s smaller than today’s standard, you may continue that line when expanding a permitted use, as long as you still meet max lot coverage and other setbacks. Front yards are excluded. § 9-5.602.

Fences and walls (quick highlights)

• Max fence height generally 6 ft; up to 8 ft possible with findings in certain contexts; front-yard fences limited to 36 inches; special corner-side placement allowances. §§ 9-5.1601–1603.

Where permitted uses are listed

• Allowed uses by zone are in §§ 9-5.3802–3803 (Table of Land Use Regulations). Use that table in tandem with the dimensional standards here.

District-by-District Standards and Notes

Below, each district lists purpose/typical uses (where stated in the code), then the key dimensional rules from § 9-5.601. For full permit triggers and submittals, see Antioch Zoning and Antioch Design Review.

RR Rural Residential

• Purpose/uses: Large-lot custom homes consistent with Estate Residential; up to ~1 du/gross developable acre; typical lot sizes around a half-acre or larger. § (Residential districts description).
• Key standards: Determined case-by-case via Planned Development process per table (TBD by Council). § 9-5.601.

RE Estate Residential

• Purpose/uses: Not found in retrieved materials.
• Key standards: Determined via PD process (TBD by Council). § 9-5.601.

R-4 Single-Family Residential (up to 4 du/ac)

• Purpose/uses: Standard single-family consistent with Low Density GP.
• Key standards: 35 ft height; 6,000 sq ft min lot; 65/60 ft min lot width (corner/interior); 40% lot coverage; max density 4 du/ac; front per footnote f; side 5 ft; rear 20 ft. § 9-5.601 (Table 9-5.601).

R-6 Single-Family Residential (up to 6 du/ac)

• Purpose/uses: Standard single-family consistent with Medium-Low Density GP.
• Key standards: Same as R-4 except max density 6 du/ac, rear 20 ft. § 9-5.601.

R-10 Medium Density Residential

• Purpose/uses: Attached single-family and multi-family at 6–10 du/ac.
• Key standards: 45 ft height; 6,000 sq ft min lot; 65/60 ft width; 40% coverage; max density 10 du/ac; front per f; side 5 ft; rear 10 ft. § 9-5.601.

R-20 High Density Residential (up to 20 du/ac)

• Purpose/uses: Multi-family; may allow higher densities with community benefit per ordinance/state law.
• Key standards: 45 ft; 20,000 sq ft lot; 70 ft width; 40% coverage; max 20 du/ac; front per f; side 5 ft; rear 10 ft. § 9-5.601.

R-25 High Density Residential (20–25 du/ac)

• Purpose/uses: Multi-family with amenities and high-quality living environment.
• Key standards: 45 ft; 20,000 sq ft lot; 70 ft width; 50% coverage; 20–25 du/ac; front per f; side 5 ft; rear 10 ft, but if abutting RR/RE/R‑4/R‑6, min 20 ft (footnote m). § 9-5.601.

R-35 High Density Residential (25–35 du/ac)

• Purpose/uses: Multi-family at higher intensity.
• Key standards: 45 ft; 20,000 sq ft lot; 70 ft width; 50% coverage; 25–35 du/ac; front per f; side 5 ft; rear 10 ft, or 20 ft if abutting RR/RE/R‑4/R‑6 (footnote m). § 9-5.601.

MCR Mixed Commercial/Residential

• Purpose/uses: Not found in retrieved materials.
• Key standards: 45 ft; 6,500 sq ft lot; 65/60 ft width; 50% coverage; density up to 20 du/ac; front/side per f; rear 10 ft. § 9-5.601.

RTC Rivertown Commercial

• Purpose/uses: Downtown/Rivertown core mixed-use commercial; detailed purpose not in retrieved materials. See Downtown Specific Plan adoption.
• Key standards: 50 ft; 2,500 sq ft lot; 25 ft min width (with façade width patterning if over that, footnote g); 100% lot coverage; baseline residential density 20 du/ac, with a pathway up to 45 du/ac in a defined subarea if first floor is entirely commercial, public amenities are provided, and a use permit is granted (footnote h). Buildings are placed on the property line; first floors extend property-line to property-line, with narrow exceptions (footnotes i & j). Setbacks are 0 ft front/side/rear. § 9-5.601.

RTR-10 Rivertown Residential (approx. 10–12 du/ac)

• Purpose/uses: Not found in retrieved materials.
• Key standards: 45 ft; 3,500 sq ft lot; 45/45 ft width; 50% coverage; max density shown as 12; front 15 ft; side 10/5 ft (corner/interior); rear 15 ft. § 9-5.601.

RTR-20 Rivertown Residential (up to 20 du/ac)

• Purpose/uses: Not found in retrieved materials.
• Key standards: 45 ft; 20,000 sq ft lot; 100 ft width; 50% coverage; max 20 du/ac; front 15 ft; side 10 ft; rear 10 ft. § 9-5.601.

WF Waterfront

• Purpose/uses: Not found in retrieved materials.
• Key standards: 45 ft; 6,500 sq ft lot; 60 ft width; 60% coverage; 0 ft front/side/rear setbacks. § 9-5.601.

PBC Planned Business Center

• Purpose/uses: Not found in retrieved materials.
• Key standards: 35 ft; 20,000 sq ft lot; 65/60 ft width; 35% coverage; front/side per f; 0 ft rear. § 9-5.601.

C-0, C-1, C-2 Commercial

• Purpose/uses: See citywide Land Use Table for specific commercial categories.
• Key standards: 35 ft height; 20,000 sq ft lot; 65/60 ft width; 35% coverage; front/side per f; rear 10 ft. § 9-5.601.

C-3 Service Commercial

• Purpose/uses: Service commercial; also cross-referenced in the RRMP article.
• Key standards: 70 ft; 20,000 sq ft lot; 35% coverage; front/side per f; rear 10 ft. § 9-5.601.

M-1, M-2 Industrial

• Purpose/uses: Light/heavy industrial; see Land Use Table for specific uses.
• Key standards: M‑1: 45 ft; M‑2: 70 ft; both require 40,000 sq ft min lot, 100 ft width; 50% coverage; front/side per f; 0 ft rear. § 9-5.601.

H Hospital

• Purpose/uses: Not found in retrieved materials.
• Key standards: 70 ft height; other yard/coverage standards follow C‑0 via table note. § 9-5.601.

OS Open Space

• Purpose/uses: Open Space; numeric development standards are “NA” in the table. § 9-5.601.

PD, HPD, TOD, S (Planned/Specific Plan–based districts)

• Purpose/uses: Standards are set through the Planned Development/Specific Plan approval; the table lists these as determined by City Council through the PD process. § 9-5.601; see Article 23 (Planned Development) for how PD standards are created and tied to the final development plan.
• RRMP (Roddy Ranch Master Plan) is a PD-type district with its own development guidelines (e.g., estate residential guidance and a service commercial cross-reference to § 9-5.601). Article 41.

Overlay Districts most relevant to development standards

• CIH Commercial Infill Housing Overlay: By-right residential between 12–35 du/ac; up to 45 ft/four stories by right; above that requires a use permit; follows objective design standards adopted by resolution; parking per Table 9‑5.1703.1. § 9-5.3849.
• IH Innovative Housing Overlay: “Cottage communities” on sites with religious assembly; density up to 15 du/ac by right on the “site development area”; objective standards include cottage height 18 ft (up to 25 ft with steeper pitched roofs), building separation 5 ft, specific setbacks when adjacent to property lines, pedestrian-path connectivity, and open-space minimums; parking per § 9‑5.1704(F). § 9-5.3850.

Quick-reference standards (selected zones)

Notes:

• “f” is the graduated front-and-street-side setback standard by street type and land use.
• Garage doors must be set back 20 ft from the property line they face in any residential district (footnote k).
• Townhomes on individually owned lots can be as small as 1,800 sq ft with 0 ft interior side yards (footnote l).

Related approval frameworks that affect development standards

• Planned Development Districts: When a site is rezoned to PD/HPD (or RRMP), the City Council sets custom standards—minimum lots, setbacks, heights, coverage, and open space—through a final development plan. Those standards then function as the “zoning code” for that land. §§ 9-5.2301–2306; Article 41.
• Overlays: CIH and IH overlays can supersede some base-zone dimensional norms with objective, by-right standards. § 9-5.3849; § 9-5.3850; see Antioch Overlay Districts.
• Multi-Family Objective Design Standards: Apply citywide where multi-family is permitted, except where CIH/IH overlay standards govern. § 9-5.701.
• Other citywide requirements that frequently interact with site design: Antioch Landscaping and Screening and Antioch Signage. For properties with legally nonconforming situations, see Antioch Nonconforming Uses. Variance pathways are in Antioch Variances and Exceptions. If your site is historic, consult Antioch Historic Preservation.

Checklist

• Identify your base district and any overlays on the zoning map; pull the correct row in § 9-5.601 (Table 9-5.601) and note any footnotes (a–m) that apply.
• Apply the street-type setback “f” rule to your frontage(s) and confirm the 20 ft garage standard if residential (footnote k).
• Test lot coverage against the zone cap and, for townhomes, check footnote l for small-lot/zero-lot-line allowances.
• For multi-family next to lower-density residential, confirm the 20 ft rear yard (footnote m).
• If in RTC, confirm property-line building placement, first-floor build-to requirements, and any density bonus criteria in the eligible subarea.
• If in CIH or IH, apply those objective standards and densities before defaulting to base-zone rules.
• Check accessory structures, fences, and any legally established setbacks that may continue. §§ 9-5.602–603; §§ 9-5.1601–1603.
• Verify design review triggers and coordinate early with staff if you anticipate design review or special findings. § 9-5.2607.
• Cross-check parking with Antioch Parking before finalizing your site layout. § 9-5.1701 et seq.

Risks & Ambiguities

Plain-English Summary

Antioch assigns each zone a package of numbers—how tall you can build, how much of the lot you can cover, how far you must set back from the street and neighbors, and, for residential, how many homes per acre. The rules you’ll actually use are in Table 9-5.601: find your district row, apply the footnotes (especially the street-type setback footnote), and then layer on any overlay or PD-specific standards that supersede the base zone. Accessory buildings, fences, and legally established yard lines have their own sections. When in doubt, verify with the Planning Division early, especially in Rivertown and in PD/overlay areas.

Information Gaps

• Detailed “purpose” statements and “typical permitted uses” for several non-residential and Rivertown districts (MCR, RTC, RTR-10/20, WF, C-0 through C-3) were not included in the retrieved excerpts. Not found in retrieved materials. See §§ 9-5.3802–3803 for the official use table.
• Any citywide floor area ratio (FAR) limits in base commercial/industrial zones were not located. Not found in retrieved materials. Note: RRMP article references 0.50 FAR for visitor-serving commercial in that master plan only.
• Exact Downtown/Rivertown district boundary descriptions beyond the adoption reference. Verify with the jurisdiction.

Source References

• Title 9, Chapter 5: Zoning Ordinance; § 9-5.601 Height and Area Regulations, Table 9-5.601 and footnotes a–m.
• § 9-5.602 Legally Established Yard Setbacks.
• § 9-5.603 Accessory Buildings.
• §§ 9-5.1601–1603 Fences, Walls, Hedges, and Screen Plantings.
• §§ 9-5.3802–3803 Land Use Regulations (use table).
• Article 23: Planned Development District (PD standards creation and effect).
• Article 41: RRMP (Roddy Ranch Master Plan) District.
• § 9-5.3849 Commercial Infill Housing (CIH) Overlay.
• § 9-5.3850 Innovative Housing (IH) Overlay (Cottage communities).
• § 9-5.701 Multi-Family Residential Objective Design Standards; § 9-5.2607 Design Review applicability.

Retrieved passages

• Antioch Zoning Code (§ 4) High relevance show source text
• Antioch Zoning Code (§ 9-5.2302) High relevance show source text
• Antioch Zoning Code (§ 65583) High relevance show source text
• Antioch Zoning Code (§ 9-5.603) High relevance show source text
• Antioch Zoning Code (§ 9-5.3850) High relevance show source text
• Antioch Zoning Code (§ 9-5.4104) High relevance show source text
• Antioch Zoning Code (chapter for) High relevance show source text
• CBC § 66314 (§ 66314) High relevance show source text
• Antioch Zoning Code (§ 9-5.3846) High relevance show source text
• Antioch Zoning Code (§ 9-5.601) High relevance show source text
• Antioch Zoning Code (§ 9-5.1701) High relevance show source text
• Antioch Zoning Code (§ 9-5.3846) High relevance show source text
• Antioch Zoning Code High relevance show source text
• California Building Code Medium relevance show source text
• CBC § 21155 (§ 21155) Medium relevance show source text
• CBC § 310 (title to) Medium relevance show source text
• Antioch Zoning Code (Title 9) Medium relevance show source text
• Antioch Zoning Code (§ 66317) Medium relevance show source text
• Antioch Zoning Code (§ 9-5.3845) Medium relevance show source text
• Antioch Zoning Code (§ 9-5.4002) Medium relevance show source text

Cited sections

• Title 9, Chapter 5: Zoning Ordinance; § 9-5.601 Height and Area Regulations, Table 9-5.601 and footnotes a–m. (Title 9)
• § 9-5.602 Legally Established Yard Setbacks. (§ 9-5.602)
• § 9-5.603 Accessory Buildings. (§ 9-5.603)
• §§ 9-5.1601–1603 Fences, Walls, Hedges, and Screen Plantings. (§ 9-5.1601)
• §§ 9-5.3802–3803 Land Use Regulations (use table). (§ 9-5.3802)
• Article 23: Planned Development District (PD standards creation and effect). (Article 23)
• Article 41: RRMP (Roddy Ranch Master Plan) District. (Article 41)
• § 9-5.3849 Commercial Infill Housing (CIH) Overlay. (§ 9-5.3849)
• § 9-5.3850 Innovative Housing (IH) Overlay (Cottage communities). (§ 9-5.3850)
• § 9-5.701 Multi-Family Residential Objective Design Standards; § 9-5.2607 Design Review applicability. (§ 9-5.701)
• Antioch_ZoningCode.md

• Official Antioch code library