Local zoning · Auburn

Auburn — Overlay Districts

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

Last reviewed: July 1, 2026

Overview

Auburn’s zoning ordinance in Title XV, Chapter 159 layers several “overlay” and “combining” districts on top of base zones to address special conditions like historic character areas, flood hazards, airport safety, mineral resources, and minimum lot sizes. Overlays do not replace the base zoning shown on the City’s official zoning map; they add extra review, use limitations, or dimensional standards that control development within mapped areas or where suffixes appear on parcel zoning (e.g., “-7” for minimum lot size). See the list of established districts and combining designations in § 159.015, with boundaries maintained on the City’s zoning map on file with the Planning Department (§ 159.017; Appendix A) .

How Auburn treats overlays

Base zoning and combining suffixes: The City establishes base districts (e.g., R-1, C-2, M-2) and combining districts/suffixes (e.g., -7, -1A, -P) in § 159.015. Minimum lot and selected parking standards for many of these combinations are codified in Appendix A .
Mapping: District boundaries and any designated overlay areas are maintained on the official zoning map; design review districts are also identified on a separate map on file per § 159.113 and § 159.017 .
Overlays vs. special base districts: Auburn also has special base districts (e.g., AI-DC Airport Industrial Design Control, DC Auburn Dam Overlook Civic Design Control, DH Auburn Historic) that embed tailored standards in the base zone (§ 159.015). Treat these as base zoning, not overlays, unless a separate overlay applies concurrently .

District-by-District breakdown

Historic Design Review District (includes Downtown and Old Town subareas)

Purpose: Protect and enhance places, buildings, and districts with unique/historic character, including Downtown and Old Town, through a tailored design review program (§ 159.112; § 159.490–159.507) .
Where it applies: Mapped “Historic Design Review District” encompassing the Downtown Design Review District, the Old Town Design Review District, and properties designated as a historic resource (§ 159.112; § 159.113) .
What it changes: Requires a Historic Design Review Permit for new construction and a broad range of exterior alterations; in historic areas, even changes to paint color, roofing, and signage can trigger review (§ 159.114(C)) .
Key standards:
- Design criteria ensure alterations don’t increase a non‑contributory character and push projects toward compatibility (§ 159.498–159.499; application language at § 159.499 and related criteria discussion) .
- Signs have stricter size/height limits in Old Town and Downtown Historic Design Review Districts (e.g., max freestanding sign height 10 ft in these districts) under the City’s signage rules (§§ 159.185–159.198; see height note) .
Approvals: The Historic Design Review Commission is the reviewing authority for projects in the Historic Design Review District (§ 159.112) .
Uses and dimensional standards: Follow the underlying base zone and Appendix A; the overlay adds design controls and may affect signage and site features (§ 159 Appendix A; §§ 159.185–159.198) .

Design Review Districts (non‑historic, overlay program)

Purpose: Establishes citywide and area‑specific design review to address appearance, site design, and compatibility for commercial/office/industrial and multifamily projects (§ 159.111) .
Where it applies: Citywide for specified project types; additional Design Review Districts may be established by Council resolution and shown on a map on file (§ 159.113) .
What it changes: Requires a Design Review Permit for new buildings, large additions, substantial facade remodels, and certain site modifications; the Director may approve minor changes administratively (§ 159.114(A)–(B)) .
Uses and dimensional standards: Follow the base zone; overlay adds design controls and may coordinate with other standards such as design review procedures, signage, and landscaping and screening (§ 159.114; § 159.185–159.198; see also Chapter 153 references within zoning text) .

Flood Damage Prevention (Areas of Special Flood Hazard)

Purpose: Minimize flood losses and regulate development in mapped flood hazard areas, implementing FEMA floodplain management concepts (§§ 159.310–159.315) .
Where it applies: “Areas of special flood hazard” as shown on FEMA Flood Insurance Rate Maps; definitions and methods are provided in the flood subchapter (§ 159.311; § 159.310) .
What it changes: Adds flood‑specific development standards and procedures, including site studies, elevation or floodproofing requirements, administration, and a tailored variance procedure (§§ 159.312–159.315) .
Key standards:
- The ordinance explains minimum floor elevation and floodproofing concepts for construction in the 100‑year floodplain (Flood Damage Prevention subchapter) — confirm project‑specific requirements with the Floodplain Administrator (§§ 159.310–159.315) .
- Variances are rare and require findings tied to exceptional hardship and public safety (§ 159.315) .
Uses and dimensional standards: Base zoning applies, but development must also meet flood overlay provisions (§§ 159.310–159.315) .

Airport Zoning Overlay

Purpose: Protect airspace and public safety around Auburn Municipal Airport by controlling heights, uses, and obstructions (§§ 159.140–159.151) .
Where it applies: Within defined airport zones and the Airport Influence Area/Referral Area, as coordinated with the adopted Airport Land Use Compatibility Plan (ALUCP) (§ 159.142) .
What it changes: Establishes airport zones (§ 159.143), airport zone height limitations (§ 159.144), and use restrictions (§ 159.145) to prevent air navigation hazards; enforcement and appeals procedures are set out in §§ 159.148–159.150 .
Related base district near the airport: The AI‑DC Airport Industrial Design Control base district ties permitted uses to ALUCP standards (§ 159.043) — separate from the airport overlay but frequently concurrent .

Mineral Extraction Combining District (ME)

Purpose: Flag lands with existing or potential mineral resources and conditionally allow mineral extraction/processing subject to environmental review and CUPs (§§ 159.370–159.377) .
Where it applies: Parcels where the zone symbol is followed by “ME” (e.g., “AR‑ME”); criteria for applying ME include current or past mining or mapped mineral resource zones (§ 159.377) .
What it changes:
- Base‑zone permitted, accessory, and temporary uses continue to apply (§§ 159.371–159.373) .
- Mining, quarrying, commercial extraction, and on‑site processing become conditionally allowed uses (Use Permit) (§ 159.374; “processing” defined in § 159.375) .
- ME does not waive environmental review or Surface Mining and Reclamation Act (SMARA) compliance (§ 159.376; related mining permits at §§ 159.345–159.356) .
Uses and dimensional standards: Follow the base zone and Appendix A; overlay mainly alters allowable resource uses and notice/expectations (§ 159 Appendix A) .

Minimum Lot Area Combining Districts (-5, -7, -8.5, -10, -15, -1A, -2A)

Purpose: Ensure larger minimum lot areas than the base zone otherwise requires.
Where it applies: As a suffix to the base zoning on the map (e.g., “R‑1‑7”).
What it changes: Sets the minimum lot area shown in Appendix A. For example, -7 requires a 7,000 sq ft minimum lot; -1A requires 1 acre (§ 159 Appendix A) .
Uses and dimensional standards: All other base‑zone standards still apply unless another overlay says otherwise (§ 159 Appendix A) .

Parking Combining District (-P)

Purpose: Tailor off‑street parking ratios in mapped areas.
Where it applies: As a suffix to the base zoning on the map (e.g., “C‑1‑P”).
What it changes: Appendix A shows the -P combining district sets a different parking ratio for certain uses (e.g., “New construction: 1 space per 600 sq ft; Reconstruction: 1 per 1,200 sq ft,” as shown in the Parking Spaces Required column) (§ 159 Appendix A) .
Interaction with citywide rules: The combining ratio works in tandem with Auburn’s general parking framework; where conflict exists, verify with the City which standard controls for your use and overlay mapping (Not found in retrieved materials for §§ 159.165–159.175 specifics).

Key Overlay Triggers & Standards (quick view)

Overlay District	What it changes	Typical triggers	Notes	Code Reference
Historic Design Review District (Downtown/Old Town)	Adds historic design permit and criteria, tighter signage	New buildings; exterior alterations; non-similar repaint/re-roof; signs	Commission is review authority; 10 ft freestanding sign max in Old Town/Downtown	§ 159.112; § 159.114(C); §§ 159.490–159.507; §§ 159.185–159.198
Design Review Districts (non-historic)	Adds design permit/standards	New buildings; >20% additions; major facade work; site changes	Director may approve minor items	§ 159.111–§ 159.114
Flood Damage Prevention	Floodproofing/elevation; admin and variance rules	Work in FEMA special flood hazard areas	Variances rare; project engineering often required	§§ 159.310–159.315
Airport Zoning	Height and use restrictions within airport zones/influence area	Structures, trees, utilities, or uses within mapped airport zones	Coordinates with ALUCP; separate AI‑DC base zone nearby	§§ 159.140–159.151; § 159.043
Mineral Extraction Combining (ME)	Conditional allowance for mining/processing	Properties with “ME” suffix	Base uses stay; SMARA compliance still required	§§ 159.370–159.377; §§ 159.345–159.356
Minimum Lot Area Combining (-5, -7, -8.5, -10, -15, -1A, -2A)	Sets larger minimum lot area	Any development/subdivision on parcels with suffix	Numbers in Appendix A; base standards otherwise apply	§ 159.015; Appendix A
Parking Combining (-P)	Modifies parking ratios	New or reconstructed floor area in mapped -P areas	Use Appendix A ratios; verify use-by-use	Appendix A (Parking column)

Checklist

Confirm your base zoning and any combining suffixes on the official zoning map; if a suffix like -7, -1A, or -P appears, apply those overlay standards (§ 159.015; § 159.017; Appendix A) .
If your site is in Old Town/Downtown or a designated historic resource, plan for a Historic Design Review Permit and adherence to historic criteria and signage limits (§ 159.112; § 159.114(C); §§ 159.490–159.507; §§ 159.185–159.198) .
For commercial, office, industrial, or multifamily projects citywide, scope whether a Design Review Permit is required versus administrative approval or exemption (§ 159.114) .
Check FEMA flood maps; if in a special flood hazard area, integrate flood development standards early and discuss variances only where exceptional hardship exists (§§ 159.310–159.315) .
Near Auburn Municipal Airport, evaluate height and use restrictions under Airport Zoning and coordinate with ALUCP (§§ 159.140–159.151; § 159.043) .
If zoning shows “ME,” budget for a Use Permit and SMARA‑related submittals for any extraction/processing proposal (§§ 159.370–159.377; §§ 159.345–159.356) .
Coordinate overlay requirements with applicable design review, signage, and landscaping and screening standards, and confirm potential nonconforming uses implications (§ 159.113; §§ 159.185–159.198; index reference for §§ 159.240–159.246) .

Risks & Ambiguities

Issue	Why it matters	What to verify
Exact overlay boundaries	Overlays and combining suffixes are map-driven	Confirm your parcel’s overlay designations on the latest zoning and design review district maps (§ 159.017; § 159.113)
Historic vs. non-historic design review	Triggers and approving authority differ	Whether the site is in the Historic Design Review District and whether the proposal triggers Historic vs. standard Design Review (§ 159.114)
Floodplain elevation requirements	Technical thresholds affect cost/scope	Required elevation/floodproofing standards and whether a variance is even feasible for your case (§§ 159.310–159.315)
Airport height limits	May cap building height and signage	Applicable airport zone, ALUCP consistency, and any permit/marking requirements (§§ 159.140–159.151; § 159.043)
ME extraction allowances	Resource projects face layered approvals	Whether “ME” applies, Use Permit criteria, and SMARA consistency (§§ 159.370–159.377; §§ 159.345–159.356)
Minimum lot size suffixes	Control subdivision potential	Which combining suffix applies and the corresponding minimum lot area in Appendix A (§ 159 Appendix A)
-P parking ratios	Affects site capacity and layout	Whether -P applies to your use and how it interacts with general parking rules (Appendix A; Not found in retrieved materials for §§ 159.165–159.175 specifics)

Plain-English Summary

In Auburn, your base zoning tells you what you can build, but overlays and combining suffixes can change the rules on top of that—requiring extra design review in Old Town/Downtown, setting bigger minimum lot sizes, limiting heights near the airport, adding floodproofing in flood zones, or allowing mining where “ME” is mapped. Always check if your parcel carries a suffix like “-7” or lies in a mapped overlay area; those layers can be the difference between a by‑right project and one needing special permits and added standards (§§ 159.015, 159.017; § 159.114; §§ 159.310–159.315; §§ 159.140–159.151; §§ 159.370–159.377) .

Source References

Title XV: Land Use — Zoning Law of the City of Auburn; districts established; zoning map procedures (§§ 159.002–159.006; § 159.015; § 159.017; Appendix A) .
Design Review program; definitions; areas of application; permit requirements (§§ 159.110–159.125; esp. § 159.111–§ 159.114) .
Historic Preservation; Historic Design Review District; permits and criteria (§§ 159.490–159.507) .
Signs; historic district sign limits (Old Town/Downtown) (§§ 159.185–159.198; freestanding sign height note) .
Flood Damage Prevention overlay (§§ 159.310–159.315) .
Airport Zoning overlay; airport zones, height limits, use restrictions (§§ 159.140–159.151) .
Airport Industrial Design Control base district (AI‑DC) (§ 159.043) .
Mineral Extraction Combining District (ME) (§§ 159.370–159.377); related Surface Mining Permits (§§ 159.345–159.356) .
Landscaping references within zoning text to Chapter 153 (landscaping) for development (§ 153.02; § 153.06 cited in zoning text) .

Sources

Retrieved passages

Auburn Zoning Code (chapter shall) Medium relevance
Auburn Zoning Code Medium relevance
Auburn Zoning Code (§ 159.015.) Medium relevance
Auburn Zoning Code Medium relevance
Auburn Zoning Code (§ 9-3.1620) Medium relevance
Auburn Zoning Code (§ 7-9.403) Medium relevance
Auburn Zoning Code (chapter are) Medium relevance
Auburn Zoning Code (§ 50675.2) Medium relevance
Auburn Zoning Code (§ 9-4.2412) Medium relevance
Auburn Zoning Code (§ 9-4.2503) Medium relevance
Auburn Zoning Code (§ 9-3.2417) Medium relevance
Auburn Zoning Code (§ 9-4.2409) Medium relevance
Auburn Zoning Code (Section 159.180) Medium relevance
Auburn Zoning Code (§ 9.4-1701) Medium relevance
Auburn Zoning Code (§ 159.405) Medium relevance
Auburn Zoning Code (§ 9-4.704) Medium relevance
Auburn Zoning Code (§ 9-4.512) Medium relevance
Auburn Zoning Code (§ 9-4.516) Medium relevance

Cited sections

Official Auburn code library

Frequently asked questions

Does Auburn use suffixes like “-7” or “-1A” on zoning? What do they mean?

Yes. They are combining districts that set larger minimum lot sizes. For example, “-7” means a 7,000 sq ft minimum; “-1A” means 1 acre. These apply in addition to your base zoning and are shown in Appendix A and the district list in § 159.015. Verify your map designation with the City (§ 159.015; Appendix A) .

I’m renovating a storefront in Old Town. Do I need Historic Design Review?

Likely. In the Historic Design Review District (which includes Old Town and Downtown), exterior changes—down to non‑similar repainting or re‑roofing—typically require a Historic Design Review Permit. The Historic Design Review Commission is the approving authority (§ 159.112; § 159.114(C)) .

What floodplain rules could affect my project?

Projects in a FEMA special flood hazard area must meet Auburn’s Flood Damage Prevention standards, which address site studies, elevation/floodproofing, and administration. Variances are rare and tied to exceptional hardship criteria (§§ 159.310–159.315) .

How do airport height limits work near Auburn Municipal Airport?

Auburn’s Airport Zoning overlay sets airport zones, height limitations, and use restrictions to prevent airspace hazards. The Airport Influence Area is defined, and consistency with the ALUCP is required. Check §§ 159.143–159.145 for the specific limitations (§§ 159.140–159.151) .

What is the ME (Mineral Extraction) combining district?

“ME” flags parcels with mineral resources and conditionally allows mining/processing via a Use Permit, with SMARA compliance and environmental review still required. Base‑zone uses remain otherwise allowed (§§ 159.370–159.377; §§ 159.345–159.356) .

Are signs treated differently in Old Town and Downtown?

Yes. Among other rules, freestanding signs in the Old Town and Downtown Historic Design Review Districts have a 10‑ft maximum height under the sign code’s district‑specific standards (§§ 159.185–159.198) .

If my project only changes paint or materials, can Design Review be administrative?

Often. The Director may approve minor changes administratively, while larger additions or significant facade work require a Design Review Permit (§ 159.114(A)–(B)) .

Can floodplain elevation rules be waived with a variance?

Only in exceptional circumstances. Auburn’s flood variance procedure is detailed and designed to screen out cases where alternatives exist; rarity and strict findings apply (§ 159.315) .

Who approves projects in the Historic Design Review District?

The Historic Design Review Commission is the approving authority for projects in the Historic Design Review District (§ 159.112) .

What happens if an overlay makes my existing use nonconforming?

Existing nonconforming situations are handled under the City’s Non‑Conforming Uses and Buildings provisions; consult those rules to understand maintenance/expansion limits (index reference §§ 159.240–159.246) and verify with staff for your case .

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