Local zoning · Antioch

Antioch — Overlay Districts

Overlay Districts under the Antioch local zoning and planning code, with the controlling citations.

Last reviewed: July 1, 2026

Overview

Overlay districts in the City of Antioch’s Title 9, Chapter 5 Zoning Ordinance layer additional, location-specific rules on top of a parcel’s base zoning to enable or tightly regulate targeted uses (e.g., infill housing, emergency shelters, cannabis businesses). The City’s summary of districts lists several overlays, including the H, SH, ES, CB, TH, CIH, and IH districts, each with distinct triggers, approval paths, and standards that either supersede or complement the underlying zone’s rules . Where an overlay grants ministerial “by-right” approvals, it can change typical entitlement expectations and how projects interface with Antioch Zoning, Antioch Land Use, Antioch Development Standards, Antioch Parking, and Antioch Design Review.

What counts as an “Overlay” in Antioch

Article 38’s district list specifically names these overlay districts: H Hospital/Medical Center, SH Senior Housing, ES Emergency Shelter, CB Cannabis Business (with subareas CB 1, CB 2 Downtown Antioch, CB 3 Somersville District), TH Transitional Housing, CIH Commercial Infill Housing, and IH Innovative Housing . Some legacy or combining districts (e.g., T Manufactured Housing Combining, HPD Hillside Planned Development) are not treated as overlays for purposes of this page.

Below is a district-by-district breakdown of each Antioch overlay.

H — Hospital/Medical Center Overlay District

Purpose. Protect the Delta Memorial Medical Center area from incompatible uses and accommodate expansion of medical services .
Typical permitted/compatible uses. The overlay is “intended to protect” and “allow” compatible medical uses such as medical offices, medical supply and retail sales, laboratories, and medical-related housing (short and long term care); these are identified as compatible uses within the overlay’s stated intent .
Key dimensional standards. Not found in retrieved materials. Underlying district standards apply unless a more specific overlay rule controls.
Where it applies. In the Delta Memorial Medical Center’s area of influence; the overlay is consistent with the Delta Memorial Medical Center General Plan Overlay designation .

SH — Senior Housing Overlay District

Purpose. A legacy overlay that “applies to projects approved prior to the effective date” of the section; such projects continue to be regulated by their SH approvals, with amendments processed under the current Municipal Code .
Typical permitted uses. The code indicates the overlay “provides additional densities beyond the minimum required by state law for senior housing projects that include increased percentages for elderly and/or affordable units.” Also, in the SH overlay, “use permit approval is required for all uses” per the land use procedures section .
Key dimensional standards. Project-specific (set by the prior SH entitlement). Not found in retrieved materials as generally applicable standards.
Where it applies. Only to parcels previously zoned with SH; it is not a citywide programmatic overlay for new sites .

ES — Emergency Shelter Overlay District

Purpose. Provide suitable sites for emergency shelters and allow shelters by right when they meet specified standards; otherwise, base zone rules govern non-shelter uses on those sites .
Typical permitted uses. Emergency shelters are permitted by right in ES when they meet the Emergency Shelter standards in Article 38; for other uses, the base zoning rules apply per the table footnote .
Key development/operational standards for shelters. Among others: maximum 50 beds, stay limits typically ≤180 days (unless a management program allows longer), required indoor intake/waiting areas sized at 10 sq ft/bed (min 200 sq ft), activities largely indoors, on-site security (security plan; at least one guard per 25 beds; digital cameras), and parking per Article 17 .
Where it applies. On parcels mapped with the ES overlay on the City’s zoning map; the overlay supersedes base zoning only for the shelter use itself .

CB — Cannabis Business Overlay Districts (CB 1, CB 2, CB 3)

Purpose. Identify where cannabis businesses may locate, subject to compatibility with the underlying zone and City Council approval .
Subdistricts and where they apply.
- CB 1: “The area designated as the Cannabis Business Overlay District prior to August 1, 2021” — allows the broadest range of cannabis businesses.
- CB 2 Downtown Antioch: “The area designated as Mixed Use within the Downtown Specific Plan” — allows storefront retail only.
- CB 3 Somersville District: “The area bounded by Buchanan Rd., Delta Fair Blvd., and Fairview Dr.” — allows storefront retail only .
Approval pathway and operating terms. A use permit from the City Council is required for all cannabis businesses; the operator must enter into and comply with an operating agreement covering conditions such as public outreach, social equity, fees, security, odor control, recordkeeping, insurance, indemnity, hours, lighting, signage, and other terms to protect the public health, safety, and welfare. Additional Council findings apply for use permit approval .
Key dimensional standards. Not found in retrieved materials for CB overlays; the underlying zone and any adopted cannabis standards govern.

TH — Transitional Housing Overlay District

Purpose and uses. Listed in the district summary, but a dedicated TH section of standards was not retrieved. Not found in retrieved materials .
Key dimensional standards. Not found in retrieved materials.
Notes. Article 38 includes supportive housing footnotes and related state references; however, a stand-alone “TH overlay” standards section was not found. Verify with the jurisdiction.

CIH — Commercial Infill Housing Overlay District

Purpose. Enable high-quality medium- and high-density residential or mixed-use infill projects on commercial sites consistent with the General Plan’s Commercial Infill Housing description; the overlay acts as a housing-enabling layer on mapped sites .
Typical permitted uses and densities. Residential development of 12–35 du/ac is allowed by-right; less than 12 du/ac is not permitted; development >35 du/ac may be allowed with a use permit. On mapped CIH sites, applications are ministerially processed by staff for conformance with CIH Objective Design Standards .
Height and parking. 2–4 stories (up to 45 ft) by right; >45 ft with a use permit. Parking follows Table 9-5.1703.1 in Article 17 of the zoning code .
Relationship to design review. Multi-family or residential mixed-use projects that comply with CIH Objective Design Standards are specifically carved out from standard design review triggers in § 9-5.2607(A)(1)(b) and (2)(b) (ministerial path) .
Where it applies. Parcels mapped with the CIH overlay (by-right), or parcels that are rezoned into CIH by City Council before applying (rezone required) .

IH — Innovative Housing Overlay District

Purpose. Facilitate affordable housing development “in new and novel ways,” focused on sites currently developed with religious assembly uses that have unused/underutilized land; also facilitates ADUs offered at affordable rent consistent with state requirements .
Where it applies and how to use it. Sites mapped within IH are qualified by-right to submit for ministerial approval of cottage communities; sites not mapped require a rezone into IH by the City Council before applying. Applicants can alternatively develop per the base zoning instead of the overlay standards .
Affordability. 100% of units (excluding manager’s units) must serve lower-income households, with up to 20% moderate-income and up to 5% reserved for on-site religious-institution staff; affordability is enforced by a recorded deed restriction of 20 years unless a longer term is required by funding law or conditions .
Density, unit form, and size. A minimum of three cottages is required; density ≤15 du/ac by right (calculated on the “site development area”), with >15 du/ac requiring a use permit. Units must be 150–1,200 sq ft each; two ADUs may attach to form a duplex footprint; they are regulated by the overlay’s objective development standards rather than the general multi-family standards .
Additional development standards. The IH section includes detailed, objective standards for setbacks (when adjacent to property lines), building separation (≥5 ft), cohesive architectural treatment, pedestrian connectivity, community buildings, waste and recycling, parking, and related items; nonconforming site conditions generally need not be corrected if not implicated by the project . For broader ADU rules citywide, see Antioch ADUs.

Quick-compare: what the most active overlays change

Overlay	What it adds or changes	By-right or Discretionary?	Notable numerical standards	Code Reference
CIH	Allows residential/mixed-use infill on commercial sites consistent with CIH map/rezones; ministerial review with objective design standards	By-right at 12–35 du/ac; >35 du/ac via use permit	Height 2–4 stories (≤45 ft) by right; >45 ft via use permit; parking per Article 17	§ 9-5.3849(A)–(F)
IH	Enables affordable “cottage communities” on religious sites; ministerial on mapped sites; strong affordability requirements	By-right on mapped sites; rezone needed otherwise; >15 du/ac via use permit	100% lower-income (with limited allowances); density ≤15 du/ac by right; cottages 150–1,200 sq ft	§ 9-5.3850(C)–(F)
ES	Allows emergency shelters by right where standards are met; base zoning otherwise applies	By-right if all shelter standards are met	Max 50 beds; min 8 hours open/day between 7am–7pm; security and cameras; on-site intake; parking per Article 17	§ 9-5.3839; Table 9-5.3803 footnote 9
CB (CB 1/2/3)	Establishes where cannabis businesses may locate; subareas limit allowed cannabis uses	Discretionary (City Council use permit + operating agreement)	Subarea allowances: CB 1 broadest range; CB 2/3 storefront retail only	§ 9-5.3845; § 9-5.3801 (CB subareas)
H	Protects medical center area; clarifies compatible medical uses	Not specified; defaults to underlying processes	Not found in retrieved materials	§ 9-5.3801(V) (H overlay intent/compatibility)
SH	Legacy senior-housing overlay; applies only to previously approved projects	Discretionary amendments; use permits for all uses in SH	Project-specific; general standards not provided	§ 9-5.3401; § 9-5.3802(B)(7)
TH	Transitional Housing Overlay — listed in summary; no dedicated standards retrieved	Not found in retrieved materials	Not found in retrieved materials	§ 9-5.3801 (district list)

How overlays interact with base zoning and procedures

Base zone still matters. Unless the overlay expressly supersedes a standard (e.g., ES shelter standards, CIH density/height minimums and ministerial path), the underlying zoning district continues to govern uses and development standards .
Ministerial vs. discretionary. The CIH and IH overlays establish ministerial, objective-standard reviews for qualifying housing projects on mapped sites, while CB requires a City Council use permit and operating agreement for any cannabis business. In the SH overlay, a use permit is required for all uses per Article 38 procedures .
Design review alignment. Multi-family or residential mixed-use projects in the CIH overlay that comply with CIH Objective Design Standards are processed administratively and are specifically excepted from standard design review triggers in § 9-5.2607(A)(1)(b) and (2)(b) .
Parking. Unless an overlay sets its own parking ratio, Article 17’s parking rules apply (e.g., ES references Article 17; CIH expressly defers to Table 9-5.1703.1). See Antioch Parking for the baseline standards .

Checklist

Confirm your parcel is actually mapped in an overlay on the City’s zoning map or that a rezone into the overlay has been approved if required (CIH, IH) .
If in CIH, set residential density to at least 12 du/ac; identify whether you need a use permit for densities >35 du/ac or height >45 ft; prepare to meet CIH Objective Design Standards for ministerial review .
If in IH, verify site qualification (religious assembly site or rezone), confirm affordability (100% lower-income with limited allowances), and design cottage communities within the 150–1,200 sq ft unit size and ≤15 du/ac unless you will seek a use permit .
If in ES, design the shelter to meet the Emergency Shelter standards (beds, intake area, hours, security, and Article 17 parking) to retain by-right status .
If in CB (CB 1/2/3), plan for a City Council use permit and operating agreement with security, odor control, public outreach, and other required terms; ensure the subarea actually allows your cannabis business type (CB 2/3 storefront only) .
If in SH, treat it as a legacy entitlement; expect use permits for uses within SH and rely on project-specific conditions; consult the original approval file .
Coordinate any required design review exceptions, objective design standards submittals, and parking calculations per the overlay and Article 17 citations above .
Where standards are unclear or parcel-specific (especially H or TH), Verify with the jurisdiction.

Risks & Ambiguities

Issue	Why it matters	What to verify
Overlay vs. base-zone conflict	Some overlays supersede base-zone limits (e.g., ES, CIH); others defer to base rules	Confirm which standard controls for your use (e.g., ES shelter standards; CIH height/density)
Ministerial promises	CIH and IH promise ministerial review if objective standards are met	Confirm your site is mapped in CIH/IH; otherwise, a rezone is needed before ministerial processing
ES “by-right” caveat	Shelters lose by-right status if standards aren’t met	Program design and site plan against § 9-5.3839 (beds, intake, security, parking)
Cannabis subareas	CB 2 and CB 3 restrict to storefront retail only	Confirm your parcel’s CB subarea and that your business type is allowed; Council UP required in all CB areas
Legacy SH overlay	It applies only to previously approved projects	Rely on the recorded SH approval and conditions; amendments go through current code processes
H overlay scope	The code lists compatible uses but not citywide dimensional standards	Coordinate with staff on boundaries and whether any area-specific standards apply beyond base zoning
TH overlay details	The district is listed but no standards section was retrieved	Not found in retrieved materials; request current TH overlay text from City

Plain-English Summary

Antioch uses overlays to fine-tune what can be built and how it’s approved. Some, like CIH and IH, make qualifying housing projects faster through objective, ministerial review; others, like ES, let emergency shelters proceed by right if they meet strict standards; and CB corrals cannabis businesses into specific subareas and always needs a City Council use permit. Your base zoning still matters, but the overlay can change the density, height, process, or even the permitted use on your property.

Source References

§ 9-5.3801 Summary of Zoning Districts (overlay list and CB subareas) — City of Antioch Zoning Ordinance, Title 9, Chapter 5
§ 9-5.3802(B)(7) Use permit required in SH overlay; Article 38 procedures — Title 9, Chapter 5
§ 9-5.3839 Emergency Shelters — Title 9, Chapter 5
Table 9-5.3803 footnote 9 (ES overlay by-right rule and base-zone deference) — Title 9, Chapter 5
§ 9-5.3845 Cannabis Businesses (requirements, use permits, operating agreements) — Title 9, Chapter 5
§ 9-5.3849 Commercial Infill Housing Overlay District (CIH) — Title 9, Chapter 5
§ 9-5.3850 Innovative Housing Overlay District (IH) — Title 9, Chapter 5
§ 9-5.2607 Site Plan and Design Review Required (CIH exception for ministerial compliance) — Title 9, Chapter 5
§ 9-5.3801(V) Hospital/Medical Center Overlay District (purpose/compatible uses) — Title 9, Chapter 5
§ 9-5.3401 Senior Housing Overlay District (legacy applicability) — Title 9, Chapter 5

Information Gaps

Transitional Housing Overlay District (TH): Not found in retrieved materials (purpose, standards, mapped areas).
Dimensional standards unique to the H overlay: Not found in retrieved materials; appears to rely on underlying zoning for development controls.

Sources

Retrieved passages

Antioch Zoning Code (section shall) High relevance
Antioch Zoning Code (§ 9-5.4102) High relevance
Antioch Zoning Code (§ 9-5.3850) High relevance
Antioch Zoning Code (chapter and) High relevance
Antioch Zoning Code (§ 65450) High relevance
Antioch Zoning Code (ARTICLE 4) High relevance
Antioch Zoning Code (§ 65583) High relevance
Antioch Zoning Code High relevance
CBC § 8 (§ 8-1.01) High relevance
CBC § 9 (§ 9-5.3844) High relevance
Antioch Zoning Code (ARTICLE 37) High relevance
Antioch Zoning Code (§ 9-5.3845) Medium relevance
Antioch Zoning Code (§ 9-5.3848) Medium relevance
Antioch Zoning Code (§ 9-5.4004) Medium relevance
Antioch Zoning Code (section of) Medium relevance
Antioch Zoning Code (§ 9-5.1101) Medium relevance

Cited sections

Official Antioch code library

Frequently asked questions

What overlay districts does Antioch use, and where do I find them on the map?

Antioch lists overlays for Hospital/Medical Center (H), Senior Housing (SH), Emergency Shelter (ES), Cannabis Business (CB with CB 1/2/3), Transitional Housing (TH), Commercial Infill Housing (CIH), and Innovative Housing (IH). These are identified in the district summary and applied on the zoning map; some require a rezone to enter the overlay before applying for a project (CIH, IH) .

What does the Commercial Infill Housing (CIH) overlay allow by right?

On mapped CIH sites, residential or residential mixed-use projects at 12–35 dwelling units/acre are permitted by right and processed ministerially to objective standards; >35 du/ac or >45 ft in height requires a use permit. Parking follows Article 17’s table, not a CIH-specific ratio .

Can an emergency shelter be approved by right in Antioch?

Yes—on parcels within the ES overlay, emergency shelters are permitted by right if they meet the Emergency Shelter standards (e.g., up to 50 beds, indoor intake area, security staffing and cameras, Article 17 parking, operations largely indoors). Otherwise, base-zone regulations apply for non-shelter uses on those sites .

How does the Innovative Housing (IH) overlay work for churches?

On sites with religious assembly uses that are mapped in IH, “cottage community” housing can be approved ministerially if it meets objective standards. Projects must be 100% lower-income (with limited allowances), density is ≤15 du/ac by right, and units are 150–1,200 sq ft; >15 du/ac needs a use permit. Sites not mapped into IH require a rezone before applying .

What are the Cannabis Business (CB) subareas and what do they allow?

CB has three subareas: CB 1 (broadest range of cannabis businesses), CB 2 Downtown (storefront retail only), and CB 3 Somersville (storefront retail only). All cannabis businesses require a City Council use permit and must enter into an operating agreement addressing security, odor, outreach, insurance, etc. .

Does the Senior Housing (SH) overlay still apply to new projects?

No. The SH overlay applies only to projects approved before the effective date of § 9-5.3401. Those projects remain governed by their SH approvals; amendments are processed under the current code. For uses in SH, a use permit is required per Article 38 procedures .

Do CIH/IH projects go through Antioch’s regular design review?

If a CIH or IH project fully complies with the overlay’s objective design standards, it is processed ministerially and is excepted from the standard design review triggers identified in § 9-5.2607(A)(1)(b) and (2)(b) .

What uses are considered compatible in the Hospital/Medical Center (H) overlay?

The H overlay is intended to protect and support the Delta Memorial Medical Center area; compatible uses include medical offices, medical supply and retail sales, laboratories, and medical-related housing. Specific dimensional standards are not provided; the base zoning controls for development metrics unless noted otherwise .

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