Local zoning · Martinez

Martinez — Overlay Districts

Q: Can I build more units if my lot is in the MUO or AHO?

Potentially yes: the MUO explicitly allows increased multifamily density for projects that provide at least 20% very low/low or 30% moderate affordability and sets specific density ranges (e.g., 21.5–43 units/acre for qualifying MUO projects). AHO provides alternative review for qualifying sites with similar affordable set‑asides. Confirm required deed restrictions and density calculations per the overlay chapter. § 22.11.010–020; § 22.17.020

Q: If my property is in the D Overlay can I reduce setbacks or parking?

Under the D Overlay some dimensional relief is possible through a use permit — for example a 10 ft front yard may be allowed and the Planning Commission can permit one covered parking space per unit with appropriate findings. Verify the findings the Commission must make before counting on reduced standards. § 22.13.030(C–D)

Q: What does it mean if my site is mapped as a PUD Overlay?

A mapped PUD Overlay means the property is subject to a site‑specific PUD Plan adopted by the City Council; no entitlements are final until a PUD Plan is approved. The PUD Plan functions as a rezoning and can change height, setbacks, parking, and other standards except those protected by separate Hillside Development rules. § 22.42.030–050

Q: Where do I confirm whether my parcel is eligible for the CSO?

The CSO is applied to properties owned by qualifying religious or community nonprofit organizations on or before a specified date; check parcel ownership records and the City’s CSO chapter to confirm eligibility. § 22.31.020

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

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Last reviewed: July 2, 2026

Overview

Overlay districts in Martinez are zoning “layers” placed on top of an underlying base zone to require, allow, or incentivize different land uses or standards than the base zone. They appear on the City zoning map and either (1) defer to the underlying zone for most uses and standards or (2) change specific rules (for example, density or design-review triggers). For quick reference see the City’s Martinez Zoning page and the consolidated Martinez Development Standards. Overlays commonly reference off‑street parking rules and the City’s design review process; historic overlays coordinate with the local historic preservation program. For accessory dwelling considerations consult the Martinez ADUs guidance. Building-permit and construction technicals remain governed by the California Building Standards Code. The discussion below is strictly what the Martinez zoning ordinance itself prescribes; citations point to the controlling § references in the local code.

Overlay districts in Martinez — district-by-district

MUO — Mixed‑Use / Housing Overlay District (MUO)

Purpose: To encourage multifamily residential development and affordable housing on particular vacant or underutilized parcels by allowing increased residential densities and by‑right processing when affordability conditions are met. § 22.11.010 .
Typical permitted uses: Uses of the underlying zone remain permitted; the overlay specifically expands residential/multifamily opportunities where a project meets the overlay’s affordable‑housing thresholds. § 22.11.020 .
Key dimensional / decision‑relevant standards:
- Density for qualifying affordable projects: 21.5–43 units/acre; minimum density rules apply on Housing Element Opportunity Sites. § 22.11.020(A) .
- Affordable set‑aside trigger: at least 20% very low/low or 30% moderate (different tracks). § 22.11.010 .
- Objective development standards must follow the stated residential district (e.g., R‑1.5) unless otherwise specified. § 22.11.040 .
Where it applies: Only to parcels identified on the Zoning Map as MUO. § 22.11.010 .

D — Downtown Overlay District (D Overlay)

Purpose: To recognize higher-density downtown housing patterns, provide transitions to single‑family areas, encourage infill/rehab, and preserve downtown character. § 22.13.010 .
Typical permitted uses: The overlay adopts the permitted uses of the underlying residential zoning with exceptions only where the overlay grants modifications via discretionary approval. § 22.13.020 .
Key dimensional / decision‑relevant standards:
- The overlay allows increased density with a use permit in specified contexts (e.g., develop to R‑1.5 standards where the underlying is R‑2.5; see specifics in § 22.13.030). § 22.13.030(A–B) .
- Possible reduced front yard to 10 ft by finding of compatibility. § 22.13.030(C) .
- Reduced parking (e.g., one covered parking space per unit may be approved via use permit under findings) is explicitly provided as a discretionary option. § 22.13.030(D) .
Where it applies: Parcels mapped as D Overlay on the Zoning Map. § 22.13.010 .

Downtown Historic Overlay District (Historic Overlay)

Purpose: Preserve and rehabilitate historic commercial, civic and mixed‑use buildings downtown; provide standards for listed resources and advisory guidance for others; enable use of the State Historical Building Code where appropriate. § 22.27.010 .
Typical permitted uses: Underlying uses remain; the overlay imposes preservation rules and design review for demolition, substantial modification or new infill. § 22.27.020 .
Key dimensional / decision‑relevant standards:
- Listed buildings are subject to mandatory application of the Secretary of the Interior’s Standards for Rehabilitation as part of local review. § 22.27.050(A) .
- Design review is mandatory for demolition or substantial modification of listed resources; non‑listed properties and new construction are subject to the City’s design-review process and advisory guidelines in the Downtown Specific Plan. § 22.27.040 .
- The overlay permits voluntary use of the State Historical Building Code for qualified projects. § 22.27.010(C) .
Where it applies: Parcels designated in the Downtown Historic Overlay on the Zoning Map and in the Downtown Specific Plan. § 22.27.010–030 .

AHO — Affordable Housing Overlay District (AHO)

Purpose: Provide an alternative review path for housing developments with at least 20% lower‑income units on qualifying Housing Element sites. § 22.17.010 .
Typical permitted uses: Underlying uses remain; qualifying housing projects are eligible for the overlay’s streamlined or alternate review features. § 22.17.020 .
Key dimensional / decision‑relevant standards:
- Consistency with minimum density requirements for the overlay or underlying zoning (whichever is greater). § 22.17.020 .
- Specific objective development standards, parking rules, height limits and ancillary uses are spelled out in the chapter (see § 22.17.040–060). § 22.17.040–060 .
- Projects processed under AHO may be eligible for ministerial or alternative review depending on compliance. § 22.17.030 .
Where it applies: Parcels shown as AHO on the Zoning Map and listed Housing Element Opportunity Sites. § 22.17.010 .

CSO — Community Services Overlay District (CSO)

Purpose: Encourage multifamily residential and affordable housing on lands owned by qualifying religious or community‑oriented non‑profits. § 22.31.010 .
Typical permitted uses: Underlying uses apply, but CSO specifically enables residential intensification for eligible institutional landowners. § 22.31.020–030 .
Key dimensional / decision‑relevant standards:
- Applied city‑wide to qualifying properties owned on or before a set date (example: owned on or before January 1, 2024 per the ordinance text). § 22.31.020 .
- Uses, density and applicable standards follow the chapter’s rules (see § 22.31.030). § 22.31.030 .
Where it applies: Properties meeting the ownership and other eligibility criteria as mapped or administratively identified. § 22.31.020 .

PUD — Planned Unit Development Overlay District (PUD Overlay)

Purpose / legal effect: A PUD designation is explicitly an overlay district that places specific plan‑level requirements and modified development standards on a project site once a PUD Plan is adopted. § 22.42.030(C) .
Typical uses: PUDs permit well‑designed grouped residential, mixed‑use, or industrial campus developments tailored by the approved PUD Plan. § 22.42.020 .
Key procedural / standards points:
- No entitlement or development approval for property in a PUD Overlay until a PUD Plan is approved by City Council. § 22.42.040 .
- A PUD Plan is a rezoning / zoning text amendment for the site and may modify base‑zone development standards (height, yards, lot size, parking, etc.) except the Hillside Development Regulations. § 22.42.050(A–B) .
- PUDs require submittal of schematic plans and detailed standards (density limits, allowable uses, parking, landscaping, sign programs, phasing). § 22.42.050(C) .
Where it applies: Only where the City Council rezones a property to PUD and the PUD is mapped; the City maintains a map of approved PUDs in the Planning Division. § 22.42.130 .

Combining/Other rules that affect overlays

The ordinance directs that combining districts or combining provisions use the most restrictive standard of the combining districts when rules conflict. § 22.26.040 .
Map changes, rezones, and overlay adoptions/removals follow the zoning amendment process prescribed in Chapter 22.46 (investigation, Planning Commission, City Council actions). § 22.46.070–090 .

Key decision‑relevant table

Overlay	Primary regulatory effect (decision relevance)	Typical permitted uses	Code reference
MUO	Allows increased density for projects that commit to 20% very low/low or 30% moderate affordability; projects meeting requirements are processed as a use by right.	Underlying zone uses; multifamily encouraged.	§ 22.11.010–040
D Overlay	Encourages downtown infill, allows density increases by use permit, and potential 10 ft front setback relief; parking may be reduced via findings.	Underlying residential uses; multifamily, duplexes, etc.	§ 22.13.010–050
Downtown Historic	Mandatory historic standards for listed buildings (Secretary’s Standards); design review required; State Historic Code option.	Underlying commercial/mixed uses; preservation priority.	§ 22.27.010–050
AHO	Alternative review path for sites with ≥20% lower‑income units; objective standards/ministerial pathways specified.	Underlying uses; qualifying affordable housing projects.	§ 22.17.010–060
CSO	Enables residential intensification on eligible institutional landowners; applied city‑wide to qualifying ownerships (ownership cutoff date).	Institutional uses plus encouraged multifamily housing.	§ 22.31.010–030
PUD	Site‑specific zoning via an adopted PUD Plan; Council may modify base standards (height, setbacks, FAR, parking) as part of rezoning.	Custom mix per PUD Plan (residential, mixed‑use, R&D, etc.).	§ 22.42.030–050; 110–130
Combining rule	When in a combining district, most restrictive standard controls (coverage, setbacks, height, etc.).	N/A	§ 22.26.040

Checklist — what an applicant must satisfy (high‑level)

Confirm whether the subject parcel is mapped in one or more overlays on the City zoning map (verify MUO, D, Historic, AHO, CSO, or PUD) — see the specific overlay chapter for “where it applies.” § 22.11.010; § 22.13.010; § 22.27.010; § 22.17.010; § 22.31.020; § 22.42.030
For MUO/AHO projects: document the affordability set‑aside (deed restrictions) and confirm density target (e.g., 21.5–43 u/ac for MUO qualifying projects). § 22.11.020(A); § 22.17.020
For PUD proposals: prepare a full PUD Plan (schematic plan, density, uses, setbacks, parking, landscaping, sign program) and expect Council approval; note PUD is a rezoning. § 22.42.040–050
If the parcel is in the Downtown Historic Overlay, identify whether the building is listed; prepare materials to satisfy the Secretary of the Interior’s Standards for listed resources and anticipate mandatory design review and referral to the Martinez Historic Society. § 22.27.040–050
Verify off‑street parking requirements (Chapter 22.36) and whether the overlay allows parking waivers or reductions (example: D Overlay use‑permit option). § 22.13.030(D)
Check whether combining districts impose the most restrictive standards that may tighten setbacks or coverage. § 22.26.040
Prepare for applicable design review submittals if the overlay or project triggers it (Historic Overlay, PUD concurrent design review option). § 22.27.040; § 22.42.110

Risks & Ambiguities

Issue	Why it matters	What to verify
Overlay vs. underlying standards (which controls?)	Some overlays adopt underlying uses but allow exceptions (density, setbacks) or grant modified standards; confusion causes incorrect permit filings.	Check the specific overlay chapter for conflict language and the combining rule § 22.26.040; verify applicability on the zoning map. § 22.26.040
Whether a site qualifies for MUO/AHO incentives	Density and by‑right processing depend on documented affordability levels and site listing on the Housing Element map.	Confirm minimum affordable unit % and that the parcel is an identified Opportunity Site; require recorded deed restrictions. § 22.11.010; § 22.17.010–020
Historic status of a building	Listed buildings face mandatory historic rehabilitation standards and different review paths; missing this can lead to denial or longer reviews.	Verify whether the structure is on the City inventory or State/National lists; if listed, apply Secretary’s Standards. § 22.27.050
PUD scope creep (what the Council can change)	PUD Plans change base standards and become zoning for the site; applicants may discover constraints late.	Confirm which base standards the Council will allow modified and which are excluded (Hillside rules exception). § 22.42.050(A)
Map / ownership cutoffs for CSO	The CSO applies to properties owned on a specified date — changes in ownership or timing can remove eligibility.	Verify title/ownership date against the ordinance’s cutoff and confirm eligibility. § 22.31.020

Plain‑English summary

Martinez overlays are “extra” zoning rules layered over base zones. Many overlays simply leave underlying uses intact but add incentives (MUO, AHO), design or preservation obligations (Downtown Historic), or site‑specific rules (PUD). Always check the zoning map and the overlay chapter for the controlling rule: some overlays allow higher densities when housing affordability is provided, others require mandatory historic standards or design review. See the code citations listed below to confirm specifics for your parcel. Verify parcel‑specific application with the Community Development Department. Relevant code citations: § 22.11, § 22.13, § 22.17, § 22.27, § 22.31, § 22.42.

Source References

§ 22.11.010–040 (Mixed‑Use/Housing Overlay — MUO) — Martinez Zoning Code (ecode360) § 22.11 — https://ecode360.com/MA6944 (Martinez Zoning)
§ 22.13.010–050 (Downtown Overlay District — D) — Martinez Zoning Code § 22.13 — https://ecode360.com/MA6944
§ 22.27.010–050 (Downtown Historic Overlay District) — Martinez Zoning Code § 22.27 — https://ecode360.com/MA6944
§ 22.17.010–060 (Affordable Housing Overlay — AHO) — Martinez Zoning Code § 22.17 — https://ecode360.com/MA6944
§ 22.31.010–030 (Community Services Overlay — CSO) — Martinez Zoning Code § 22.31 — https://ecode360.com/MA6944
§ 22.42.030–050; § 22.42.110–130 (Planned Unit Development — PUD Overlay) — Martinez Zoning Code § 22.42 — https://ecode360.com/MA6944
§ 22.26.040 (Combining district rule — most restrictive applies) — Martinez Zoning Code § 22.26.040 — https://ecode360.com/MA6944
Chapter references for process and review: Chapter 22.34 (Design Review) and Chapter 22.36 (Parking) — see overlay chapters which reference those chapters for implementation (e.g., § 22.27.040; § 22.13.030(D)).

Sources

Retrieved passages

Martinez Zoning Code (Chapter in) High relevance
Martinez Zoning Code (Chapter 22.82) High relevance
Martinez Zoning Code (Chapter 22.36.) High relevance
Martinez Zoning Code (§ 22.42.020) High relevance
CBC § 22.26.040 (§ 22.26.040.) High relevance
Martinez Zoning Code (Chapter 22.81) High relevance
Martinez Zoning Code (§ 22.10.060) High relevance
CBC § 22.27.020 (§ 22.27.020.) High relevance

Cited sections

Official Martinez code library

Frequently asked questions

What is an overlay district in Martinez and how does it show up for a parcel?

An overlay district is a zoning layer that sits on top of a base zone and can change or add requirements (density, design review, incentives) for parcels shown on the Zoning Map. Confirm whether your parcel is mapped in an overlay and read that overlay’s chapter for the precise effects (for example, MUO or AHO require meeting affordability thresholds). § 22.11.010; § 22.17.010

Can I build more units if my lot is in the MUO or AHO?

Potentially yes: the MUO explicitly allows increased multifamily density for projects that provide at least 20% very low/low or 30% moderate affordability and sets specific density ranges (e.g., 21.5–43 units/acre for qualifying MUO projects). AHO provides alternative review for qualifying sites with similar affordable set‑asides. Confirm required deed restrictions and density calculations per the overlay chapter. § 22.11.010–020; § 22.17.020

Does the Downtown Historic Overlay require special design review or preservation standards?

Yes. For buildings listed on the National/State registers the ordinance requires mandatory application of the Secretary of the Interior’s Standards for Rehabilitation and mandatory design review for demolition or substantial modification; other properties in the overlay are subject to advisory historic guidelines integrated into the City’s design‑review process. § 22.27.040–050

If my property is in the D Overlay can I reduce setbacks or parking?

Under the D Overlay some dimensional relief is possible through a use permit — for example a 10 ft front yard may be allowed and the Planning Commission can permit one covered parking space per unit with appropriate findings. Verify the findings the Commission must make before counting on reduced standards. § 22.13.030(C–D)

What does it mean if my site is mapped as a PUD Overlay?

A mapped PUD Overlay means the property is subject to a site‑specific PUD Plan adopted by the City Council; no entitlements are final until a PUD Plan is approved. The PUD Plan functions as a rezoning and can change height, setbacks, parking, and other standards except those protected by separate Hillside Development rules. § 22.42.030–050

How do combining districts affect which standard I must meet?

When a combining district or combining provisions apply, the ordinance directs that development standards (density, coverage, height, yards, parking) default to the most restrictive standard among the combined districts. Always check § 22.26.040 to determine which standard governs. § 22.26.040

Do overlays change parking rules I must meet?

Overlays often refer applicants back to the City’s parking chapter (Chapter 22.36), but some overlays explicitly allow reduced parking by discretionary approval (example: D Overlay use‑permit option for one covered space per unit). Confirm both the overlay language and Chapter 22.36 requirements. § 22.13.030(D)

Are affordability commitments in MUO/AHO recorded and for how long?

Yes — affordable units are required to be subject to recorded deed restrictions for specified durations under the MUO/AHO rules (see the overlay text for exact terms and durations); the MUO spells out minimum affordability durations that must be recorded. § 22.11.020(B)

Where do I confirm whether my parcel is eligible for the CSO?

The CSO is applied to properties owned by qualifying religious or community nonprofit organizations on or before a specified date; check parcel ownership records and the City’s CSO chapter to confirm eligibility. § 22.31.020

If state law conflicts with an overlay (e.g., density bonus law), which controls?

The ordinance notes that where a conflict exists with State law (for example Government Code § 65915 density bonus provisions), State law supersedes local provisions; some overlays explicitly reference such conflicts and direct compliance with State law where applicable. Verify overlay conflict language and State code applicability. Not all conflict wording appears in each overlay chapter — verify specific text in § 22.17/§ 22.11 and applicable State statutes. § 22.17.120 (conflict language referenced) — Not found in retrieved materials for every overlay; verify with the jurisdiction.

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