Local zoning · Ukiah

Ukiah — Overlay Districts

Q: Does Ukiah have a hillside overlay, and what does it do?

Yes. The code establishes a Hillside (-H) combining district (§ 9008). The provided materials don’t include its detailed standards, so confirm slope thresholds, grading limits, and siting criteria with the City. Use the Official Zoning Map for applicability and § 9011 for boundary interpretation.

Q: What is the East Gobbi Housing Overlay Zone (HOZ)?

Ukiah created an East Gobbi Housing Overlay Zone (HOZ) with a dedicated article and a “Purpose and Intent” section (§ 9054 heading). The specifics (boundaries, permitted uses, and incentives) are not in the source materials; request the HOZ map and standards from the City before designing a project.

Q: Do Downtown “Special Designations” change my allowed uses?

No. In Downtown, designations like CE/CP/PE/PP are mapped but “allowed uses” still follow your GU/UC/DC zoning (§ 9222.1(B)). The Downtown article itself supersedes other zoning within its boundary (§ 9222.1(C)), so use Table 4 standards (§ 9225.2) for lot size, coverage, and density.

Q: How are overlay boundaries interpreted if the map isn’t clear?

Use the rules in § 9011 : follow street centerlines, parcel lines, or physical features; the Planning Commission decides tough cases (§ 9011(A)-(G)). If a boundary splits a lot, the Commission may allow extending one set of rules up to 50 ft across the line, processed like a variance (§ 9011(H)).

Q: Is a Site Development Permit required when an overlay applies?

Generally yes—Ukiah requires a Site Development Permit for all new construction, exterior changes, or on-site work (§ 9117). This is often where overlay or Downtown-specific findings are applied alongside design and compatibility findings (§ 9231.3).

Q: Do Downtown parcels have minimum lot sizes and coverage limits?

Yes. For example, DC can have interior lots as small as 2,500 sf and up to 90% coverage (or 100% with structured parking) (§ 9225.2 Table 4). GU and UC have larger minimum lots and lower coverage caps—check Table 4 for specifics.

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

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Quick answer

Ukiah’s overlays include PD, -A, -H, and the East Gobbi HOZ; PD can combine with any zone and can remove a separate use permit for permitted uses when paired with a precise plan (§ 9166). In Downtown, special designations don’t change uses; core standards like a 2,500 sf minimum lot in DC and up to 90%–100% lot coverage still follow GU/UC/DC rules (§ 9225.2), and nonresidential projects over 90 people/acre trigger Airport referral (§ 9225.2 Note 3; § 9004).

Last reviewed: July 25, 2026 · AI-generated analysis · General information, not legal advice · details

Compiled from Ukiah's adopted code with AI research tools and grounded in the sources cited below. Verify with Ukiah planning staff before relying on it.

Overview

Ukiah uses several overlay/combining districts and mapped special designations to refine base zoning. The code explicitly establishes the Planned Development combining zone (PD), Combining Agricultural (-A), and Hillside (-H), as well as an East Gobbi Housing Overlay Zone (HOZ) and Downtown “special designations.” Overlays either sit “on top of” a base district from the Ukiah Zoning map or apply within the Downtown Zoning Code geography, and they can change procedures, densities, or site planning outcomes.

Where the Downtown Zoning Code applies, it supersedes other zoning articles, but its “special designations” do not change allowed uses; uses still track the parcel’s GU/UC/DC zone (§ 9222.1(C), § 9222.1(B)).

What counts as an “overlay” in Ukiah

The code “establishes” combining/overlay districts including PD, -A, and -H in the same breath as base zones (§ 9008).
Ukiah has a mapped East Gobbi Housing Overlay Zone (HOZ) with its own article (§ 9054 heading).
Within the Downtown Zoning Code, mapped “Special Designations” (CE, CP, PE, PP, and Flood Plain annotation) function like overlays but are expressly not separate zoning; they guide public-realm expectations while allowed uses continue to come from GU / UC / DC zoning (§ 9222.1(A)-(B)).

How overlays relate to maps and boundaries

The Official Zoning Map is the final authority for zoning and any combining designations (§ 9009).
If a mapped district/overlay line is unclear, interpret it using centerlines, parcel lines, and other physical features; Planning Commission resolves edge cases (§ 9011(A)-(G)).
If a district/overlay boundary splits a lot, the Commission may allow extending one set of regulations up to 50 ft across the line as a special exception processed like a variance (§ 9011(H)).

District-by-District

Planned Development Combining Zone (PD)

Purpose and where it applies: The PD combining zone may be combined with any underlying zoning district (§ 9166(A); § 9008). It is a citywide tool that attaches to mapped parcels where approved.
Typical permitted uses: Uses are those of the underlying zone; the PD tool is chiefly procedural. When a PD zoning district and a precise PD project are proposed together, “a use permit for permitted land uses within the underlying zone shall not be required” (§ 9166(B)). Verify other entitlements case-by-case.
Key dimensional standards: Not found in source materials. Expect the underlying district’s standards to remain the baseline unless a duly adopted PD establishes different metrics. Verify with the jurisdiction.
Practical notes: PD can streamline entitlement for master-planned sites by removing an otherwise-required use permit for permitted uses (§ 9166(B)), but development still has to be consistent with the Ukiah Development Standards that apply.

Combining Agricultural (-A) District

Purpose and where it applies: The -A combining agricultural district is established by the code (§ 9008) and appears in Article 10 (“Combining Agricultural (-A) Districts”) headings.
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Practical notes: Expect -A to add agricultural preservation/compatibility conditions on top of the base zone; confirm actual allowances and triggers with the City.

Hillside (-H) District

Purpose and where it applies: The -H hillside district is established by the code (§ 9008).
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Practical notes: Anticipate slope-related development controls layered over the base zone. Verify with the jurisdiction.

East Gobbi Housing Overlay Zone (HOZ)

Purpose and where it applies: The City adopted regulations for the “East Gobbi Housing Overlay Zone (HOZ)” in Article 5.1; it includes a “Purpose and Intent” section (§ 9054 heading).
Typical permitted uses: Not found in source materials.
Key dimensional standards: Not found in source materials.
Practical notes: This is a dedicated housing overlay applied to a defined East Gobbi area. Obtain the HOZ map, permitted use table, and any streamlined housing provisions directly from the City.

Airport Compatibility Restrictions (ALUCP reference)

Purpose and where it applies: The City’s zoning is in substantial conformance with the Ukiah Municipal Airport Land Use Compatibility Plan (§ 9004). Within the Downtown Zoning Code, nonresidential projects exceeding 90 people/acre must be referred to the Airport Land Use Commission (§ 9225.2, Note 3).
Typical permitted uses: Governed by the base/overlay district; airport rules impose additional compatibility checks.
Key dimensional standards: Population-density thresholds apply to nonresidential projects; additional airport zone restrictions may apply (§ 9225.2, Notes).
Practical notes: Early coordination is critical near flight paths. Referral can affect height, intensity, and site planning.

Downtown Zoning Code — Special Designations (overlay-like)

What they are: Mapped “Special Designations” within the Downtown Zoning Code: Civic Space – Existing (CE), Civic Space – Preferred (CP), Public Parking – Existing (PE), and Parking Structure/Anchor Tenant Opportunity – Preferred (PP). The map also shows the FEMA 100‑year Flood Plain for information (§ 9222.1(B)).
How they work:
- Allowed uses are always determined by the parcel’s GU, UC, or DC zoning; the designations do not change use permissions (§ 9222.1(B)).
- Some designations carry public-realm expectations, e.g., Gibson Creek frontage should consider daylighting or granting a 60-ft right-of-way for a future public creek corridor (§ 9222.1(B)(1)(b)(2)).
- The flood plain is not a zoning designation; parcels remain subject to underlying zoning and separate flood regulations (§ 9222.1(B)(4)).
Where they apply: Only inside the Downtown Zoning Code map; the article supersedes other zoning provisions within its boundary (§ 9222.1(C)).

Downtown Zoning Code context for parcels with Special Designations

If your parcel has a Special Designation, your uses and core standards still come from GU, UC, or DC (§ 9222.1(A)-(B)). Key site standards are summarized below from Table 4 (§ 9225.2):

Standard (Downtown zones)	GU	UC	DC	Code Reference
Residential Density, min	10 du/ac	15 du/ac	15 du/ac	§ 9225.2 (Table 4)
Residential Density, max	28 du/ac	28 du/ac	28 du/ac	§ 9225.2 (Table 4, Note 4)
Block Perimeter, max	1,500 lf	1,400 lf	1,000 lf	§ 9225.2 (Table 4)
Lot Size – Interior, min	4,500 sf	4,500 sf	2,500 sf	§ 9225.2 (Table 4)
Lot Size – Corner, min	5,000 sf	5,000 sf	3,000 sf	§ 9225.2 (Table 4)
Lot Width, min	30 ft	30 ft	30 ft	§ 9225.2 (Table 4)
Lot Depth, min	70 ft	70 ft	70 ft	§ 9225.2 (Table 4)
Lot Coverage, max	70%	80%	90%	§ 9225.2 (Table 4)
Lot Coverage with Structured Parking, max	70%	100%	100%	§ 9225.2 (Table 4)
Building Type – Side Yard	Allowed	Allowed	Prohibited	§ 9225.2 (Table 4)
Parking design standards	See § 9228	See § 9228	See § 9228	§ 9225.2 (Table 4)

Notes:

Downtown standards are “also subject to Airport Zone Restrictions” as noted in Table 4; nonresidential intensity > 90 people/acre triggers ALUC referral (§ 9225.2, Note 3; § 9004).
Administration/procedures and lot standard exceptions are handled in § 9231; parking specifics are in § 9228 (both referenced by § 9225.2).

Other overlay-adjacent rules you should know

A Site Development Permit is required for all new construction, exterior modifications, or on‑site work, often the vehicle for applying overlay standards alongside Design Review findings (§ 9117; § 9231.3).
The Downtown article supersedes other zoning articles in its boundary, except where Building Regulations, Floodplain, or Airport plans control (§ 9222.1(C)).
District/overlay lines on the map are legally controlling; see adoption and change procedures (§ 9009). For edge cases, see boundary rules and 50‑ft extension option (§ 9011).

Checklist

Confirm your parcel’s base zoning and any PD / -A / -H / HOZ overlays on the Official Zoning Map (§ 9009).
If in Downtown, identify any CE/CP/PE/PP or Flood Plain special designations and confirm your GU/UC/DC zone (§ 9222.1(A)-(B)).
Apply Downtown standards if inside the Downtown Zoning Code boundary; it supersedes other zoning articles (§ 9222.1(C); § 9225.2).
If pursuing a PD plan, confirm whether a separate use permit is eliminated for permitted uses in the underlying zone (§ 9166(B)).
If near the airport or proposing high-intensity nonresidential use, check for ALUCP referral (> 90 people/acre) (§ 9225.2, Note 3; § 9004).
Prepare a Site Development Permit application; overlays and special designations are implemented through that discretionary review (§ 9117; § 9231.3).
Coordinate related requirements early: Parking (§ 9225.2 referencing § 9228), Development Standards, and potential Variances and Exceptions if a boundary splits your lot (§ 9011(H)).
If the property is potentially historic or in a sensitive context, align with Historic Preservation and resource protection findings (§ 9231.3).

Risks & Ambiguities

Issue	Why it matters	What to verify
Missing details for -A and -H	The code establishes these overlays but the provided materials don’t include their standards, uses, or maps (§ 9008).	Request the Article 10 text and official map layers showing where -A and -H apply.
Limited information for HOZ (East Gobbi)	Without the HOZ standards and map, eligibility and incentives are unclear (§ 9054 heading).	Get the HOZ article, boundary map, and any use/density/streamlining provisions from the City.
Downtown vs. citywide rules	Inside Downtown, that article supersedes other zoning, which can change assumptions about setbacks, coverage, and building types (§ 9222.1(C)).	Confirm if your site is within the Downtown Zoning Code map and apply Table 4 (§ 9225.2).
Airport compatibility	Intensity thresholds and height constraints can alter project massing and timing due to ALUC referral (§ 9225.2 Note 3; § 9004).	Calculate people-per-acre for nonresidential programs; consult the ALUCP.
Interpreting overlay boundaries	Small mapping ambiguities can shift which overlay controls apply (§ 9011(A)-(G)).	Use § 9011 rules and, if still unclear, seek Planning Commission interpretation.
Split-zoned parcels	A boundary across a lot can complicate development envelopes (§ 9011(H)).	Explore the 50‑ft extension option (processed like a variance) and align with Variances and Exceptions.

Plain-English Summary

Ukiah’s overlays add special rules on top of base zoning: PD can bundle a precise plan and, in some cases, skip a separate use permit; -A and -H add combining controls to protect agricultural and hillside areas; the HOZ targets housing in East Gobbi; and Downtown “special designations” guide public spaces while your uses still follow GU/UC/DC zoning. Always check the map, then apply the overlay plus base standards, Downtown rules where applicable, and airport compatibility triggers.

Source References

§ 9008 Establishment of Districts (establishes PD, -A, -H)
§ 9009 Adoption of Zoning Map by Reference
§ 9011 Rules for Interpretation of District Boundaries (includes 50‑ft extension)
Article 5.1 — East Gobbi Housing Overlay Zone; § 9054 Purpose and Intent (heading)
§ 9166 Application of Combining Zone/District (PD combining zone; permit relief)
§ 9222.1 Applicability; Downtown Zoning Code zones (GU/UC/DC) and Special Designations (CE/CP/PE/PP; Flood Plain)
§ 9225.2 Applicability; Table 4 Site Development Standards (GU/UC/DC), Airport referral note
§ 9004 Zoning in conformance with Ukiah Municipal Airport Land Use Compatibility Plan
§ 9117 Additional Requirements (Site Development Permit)
§ 9231.3 Findings (design/siting/resource protection)

Sources

Source passages

Ukiah Zoning Code (§ 9008) Medium relevance
Ukiah Zoning Code (§ 9225.2) Medium relevance
Ukiah Zoning Code (§ 9011) Medium relevance
Ukiah Zoning Code (§ 9222.1) Medium relevance
Ukiah Zoning Code (§ 9166) Medium relevance
Ukiah Zoning Code (§ 9117) Medium relevance
Ukiah Zoning Code (§ 9004) Medium relevance
Ukiah Zoning Code (§ 9009) Medium relevance
Ukiah Zoning Code (§ 9231.3) Medium relevance

Cited sections

§ 9008 Establishment of Districts (establishes PD, -A, -H) (§ 9008)
§ 9009 Adoption of Zoning Map by Reference (§ 9009)
§ 9011 Rules for Interpretation of District Boundaries (includes 50‑ft extension) (§ 9011)
Article 5.1 — East Gobbi Housing Overlay Zone; § 9054 Purpose and Intent (heading) (Article 5.1)
§ 9166 Application of Combining Zone/District (PD combining zone; permit relief) (§ 9166)
§ 9222.1 Applicability; Downtown Zoning Code zones (GU/UC/DC) and Special Designations (CE/CP/PE/PP; Flood Plain) (§ 9222.1)
§ 9225.2 Applicability; Table 4 Site Development Standards (GU/UC/DC), Airport referral note (§ 9225.2)
§ 9004 Zoning in conformance with Ukiah Municipal Airport Land Use Compatibility Plan (§ 9004)
§ 9117 Additional Requirements (Site Development Permit) (§ 9117)
§ 9231.3 Findings (design/siting/resource protection) (§ 9231.3)

Frequently asked questions

Does Ukiah have a hillside overlay, and what does it do?

Yes. The code establishes a Hillside (-H) combining district (§ 9008). The provided materials don’t include its detailed standards, so confirm slope thresholds, grading limits, and siting criteria with the City. Use the Official Zoning Map for applicability and § 9011 for boundary interpretation.

What is the East Gobbi Housing Overlay Zone (HOZ)?

Ukiah created an East Gobbi Housing Overlay Zone (HOZ) with a dedicated article and a “Purpose and Intent” section (§ 9054 heading). The specifics (boundaries, permitted uses, and incentives) are not in the source materials; request the HOZ map and standards from the City before designing a project.

How does a PD (Planned Development) overlay change my approvals?

A PD can be combined with any base zoning (§ 9166(A)). If a PD zoning district and a precise PD project are proposed together, a separate use permit for otherwise permitted uses in the underlying zone is not required (§ 9166(B)). Other approvals may still apply; verify with staff.

Do Downtown “Special Designations” change my allowed uses?

No. In Downtown, designations like CE/CP/PE/PP are mapped but “allowed uses” still follow your GU/UC/DC zoning (§ 9222.1(B)). The Downtown article itself supersedes other zoning within its boundary (§ 9222.1(C)), so use Table 4 standards (§ 9225.2) for lot size, coverage, and density.

What airport-related overlay rules should I consider?

Ukiah zoning conforms to the Airport Land Use Compatibility Plan (§ 9004). For Downtown, any nonresidential project exceeding 90 people/acre must be referred to the Airport Land Use Commission (§ 9225.2 Note 3). Expect potential constraints on intensity and height.

How are overlay boundaries interpreted if the map isn’t clear?

Use the rules in § 9011: follow street centerlines, parcel lines, or physical features; the Planning Commission decides tough cases (§ 9011(A)-(G)). If a boundary splits a lot, the Commission may allow extending one set of rules up to 50 ft across the line, processed like a variance (§ 9011(H)).

Is a Site Development Permit required when an overlay applies?

Generally yes—Ukiah requires a Site Development Permit for all new construction, exterior changes, or on-site work (§ 9117). This is often where overlay or Downtown-specific findings are applied alongside design and compatibility findings (§ 9231.3).

Do Downtown parcels have minimum lot sizes and coverage limits?

Yes. For example, DC can have interior lots as small as 2,500 sf and up to 90% coverage (or 100% with structured parking) (§ 9225.2 Table 4). GU and UC have larger minimum lots and lower coverage caps—check Table 4 for specifics.

General information, not legal advice.

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