Zoning Guide

Flagstaff Zoning & Land Use Guide

Last updated: Verified:

Official references and local checks

Use the official references below to identify the rules that apply to your address, then confirm parcel-specific requirements with the local authority before filing an application.

Official references

Population:
73,964
County:
Coconino County
State building code:
No mandatory statewide building code (local adoption)(statewide default)
State ADU law:
Yes — Arizona HB 2720 (2024), codified at ARS §9-461.18, requires municipalities with populations greater than 75,000 to allow at least one attached, detached, or internal accessory dwelling unit as a permitted use on any lot where a single-family dwelling is allowed. Effective January 1, 2025.
FEMA flood map:
Search flood zones
Planning department:
City of Flagstaff Planning Department
Municipal code:
View code online

Before you apply

  • Call the City of Flagstaff Planning Department: (928) 779-7632
  • Search the municipal code for the chapter that covers your zoning district and proposed use.
  • Check FEMA flood zone for your parcel — flood-zone status changes setbacks, foundation requirements, and insurance.
  • Check your HOA CC&Rs and recorded deed restrictions — they are common in Flagstaff and frequently restrict ADUs, fences, and exterior changes beyond what zoning allows.

Key Zoning Facts

Local Zoning / Building Office
City of Flagstaff Planning Department(928) 779-7632
Building Code Edition
2018 International Building Code (locally adopted)
ADU / Accessory Apartment
Verify by district

Regulatory Layers That Apply in Flagstaff

Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.

Federal

State — Arizona

  • Building Code: No mandatory statewide code (local adoption)
View Arizona zoning overview

County — Coconino County

    City / Municipal

    The municipality's zoning ordinance, building-code enforcement, and local permits form the primary local layer of land-use regulation for your property.

    Overlay Districts

    No overlay districts identified.

    Private Restrictions

    • Private covenants, deed restrictions, condominium rules, or association rules can impose requirements beyond zoning.
    • Check HOA CC&Rs for additional restrictions.

    Statewide Context (Arizona)

    Local data for Flagstaff is limited. The following state-level facts apply across Arizona and are inherited by this page until city-specific details are verified.

    State Building Code
    No mandatory statewide building code (local adoption)
    State ADU Preemption
    Yes — state law overrides local rules
    Coastal Zone
    No
    Wildfire Zones
    Yes

    ADU Rules in Flagstaff

    ADUs:Allowed(statewide context — not city-specific)

    State law (statewide context, not city-specific):

    Arizona HB 2720 (2024), codified at ARS §9-461.18, requires municipalities with populations greater than 75,000 to allow at least one attached, detached, or internal accessory dwelling unit as a permitted use on any lot where a single-family dwelling is allowed. Effective January 1, 2025.

    Source (Arizona)

    For local size, setback, and parking specifics, contact the City of Flagstaff Planning Department.

    Full ADU rules for Flagstaff →

    Permit Costs & Timelines

    Check Current Permit Fees & Timelines

    Permit fees and review times can vary by project type, scope, valuation, and required approvals. Check the current schedule with the local permitting authority before filing.

    Check current Flagstaff permit information →

    Official Sources

    City-specific

    City of Flagstaff Planning Departmentflagstaff.az.govOfficial sourceFlagstaff Municipal Codelibrary.municode.comOfficial source