Tempe ADU Permit Guide - Accessory Dwelling Unit

Housing and Building Standards Arizona 4 Minutes Read · published February 20, 2026 Flag of Arizona

In Tempe, Arizona, homeowners who want to add an Accessory Dwelling Unit (ADU) must follow local zoning and building rules administered by city planning and building departments. This guide explains the typical permit pathway, the departments to contact, common application requirements, inspections, enforcement risks, and appeal routes so you can prepare complete submissions and avoid delays. It summarizes where to find official City of Tempe forms and what to expect during review and inspection. For definitive step details consult the Tempe Planning and Development pages linked below for official forms and checklists.[1]

Penalties & Enforcement

Enforcement for ADU work in Tempe is carried out by the City of Tempe Development Services/Building Safety and Code Compliance divisions; they may inspect work, issue stop-work orders, and require removal or modification of noncompliant construction. If work proceeds without required permits or violates zoning/building standards, the city can pursue administrative orders and civil enforcement actions, and may refer matters for criminal prosecution where allowed by ordinance.[3]

  • Fine amounts: not specified on the cited page.
  • Escalation: first or repeat offence ranges are not specified on the cited page.
  • Non-monetary sanctions: stop-work orders, removal or alteration orders, denial of occupancy, and civil court actions.
  • Enforcer and inspections: Development Services/Building Safety and Code Compliance handle inspections, complaints, and enforcement; contact details in Resources below.[3]
  • Appeals and review: appeal routes are available through administrative review or municipal processes; specific time limits for appeals are not specified on the cited page.
  • Defences/discretion: permits, variances, or administrative relief may be available; process details and standards for discretionary relief are on official planning pages.[1]
Always confirm current enforcement language and deadlines with the city before you begin construction.

Applications & Forms

Permitting for an ADU typically requires a building permit application, site plan, floor plans, and any zoning/variance applications if the proposed unit does not meet dimensional or parking standards. The City of Tempe posts permit application forms and submittal checklists on its Development Services/Building pages. Fees and specific required documents should be checked on the official forms page because amounts and submittal requirements are subject to change.[2]

  • Common forms: Building Permit Application, plan sets (site and floor), permit checklist — exact form names and numbers not specified on the cited page.
  • Fees: permit fees and plan review fees are published on the city forms or fee schedule page; specific numeric fees are not specified on the cited page.
  • Submission: online or in-person submittal options are described on the Development Services page; follow the city’s current submittal instructions.
Collect complete plans and a clear site plan before submitting to reduce review cycles.

Action Steps to Apply

  • Step 1: Review ADU requirements on the City of Tempe planning pages and confirm your property zoning and allowed ADU standards.[1]
  • Step 2: Prepare site plan, floor plans, and elevations; obtain any required neighbor or HOA permissions if applicable.
  • Step 3: Complete the Building Permit Application and attach required documents; submit per Development Services instructions.[2]
  • Step 4: Schedule and pass inspections; address any corrections the reviewer issues.
  • Step 5: Pay permit and inspection fees, obtain final approval and a Certificate of Occupancy if required.
Incomplete plans and missing documentation are the most common causes of review delays.

FAQ

Do I need a permit to build an ADU in Tempe?
Yes. Building permits and compliance with zoning standards are required for new ADUs; confirm submittal requirements on the city’s Development Services and Planning pages.[2]
How long does plan review and permitting typically take?
Review times vary by workload and complexity; the city’s permit page describes current review timing but specific durations are not specified on the cited page.
Who enforces ADU rules and how do I report an unpermitted ADU?
Development Services/Building Safety and Code Compliance enforce permit and zoning rules; report concerns via the city’s code compliance contact page.[3]

How-To

  1. Confirm zoning and ADU allowance for your parcel by consulting the Tempe Planning Division resources.[1]
  2. Assemble required drawings: site plan, floor plans, elevations, and any engineering documents.
  3. Complete and submit the Building Permit Application and pay required fees; follow the city’s submission checklist.[2]
  4. Coordinate inspections during construction and respond promptly to plan review corrections.
  5. Obtain final sign-off and Certificate of Occupancy if required before use or rental of the ADU.

Key Takeaways

  • Check zoning and plan requirements with Tempe Planning before drawing plans.
  • Submit complete permit packages to avoid repeat review cycles and delays.
  • Contact Development Services or Code Compliance early if enforcement or compliance questions arise.

Help and Support / Resources

  1. [1] City of Tempe Planning Division - ADU and zoning information
  2. [2] City of Tempe Development Services - Building & Permit Forms
  3. [3] City of Tempe Code Compliance - Complaints and enforcement

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