Residential Addition / Remodel / ADU Permit in Avondale, Arizona

No — one-story detached accessory structures (other than storm shelters) up to 200 sq ft are exempt from a residential building permit under the City's amended IRC R105.2, though zoning/setback requirements may still apply.

In Avondale, the published Building Permit Fee — Based on Valuation (Tiers A–H, using AMR valuation formula for alterations) is: Same Tier A–H schedule as new construction (see Residential Building Permit); AMR valuation = Project SF × BVD Base Rate × Alteration Multiplier. Additional published fees: Building Plan Review Fee — 65% of the Building Permit Fee; Application Processing Fee — $102.00. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Avondale's published plan-review target for a residential addition / remodel / adu permit is 16–24 business days.

You'll need: Building Permit Application; Residential Submittal Checklist; Site/Plot Plan. See the required-documents checklist on this page for details on each.

Avondale requires 3 inspection(s) for a residential addition / remodel / adu permit, in order: Foundation/Footing, Rough (Framing, Electrical, Plumbing, Mechanical), Final Combination. Schedule each through City of Avondale Development Services Department — Building Services Division (623-333-4000).

Apply through City of Avondale Development Services Department — Building Services Division at 11465 W. Civic Center Drive, Avondale, AZ 85323. Phone: 623-333-4000, email: buildingservices@avondaleaz.gov. Office hours: 7:00 AM – 6:00 PM (Building Services Division, per the City's Building Services Division page); City Hall / Development Services counter hours are Monday–Thursday 7:00 AM – 6:00 PM per the City's Contact Us footer (City Hall operates a compressed 4-day, 10-hour workweek). Applications are submitted electronically via the Avondale Citizen Portal (Accela Citizen Access). Building Official: Benjamin Carr (bcarr@avondaleaz.gov), per the 2025 Arizona Building Officials (AZBO) Directory.. Official information: https://avondaleaz.gov/government/departments/development-services/building-division/.

Avondale, Arizona has adopted: Arizona has NO statewide mandatory building code floor for general construction — code adoption is a per-city/county authority under state enabling statutes (e.g., A.R.S. Title 9 for municipalities). The City of Avondale independently adopts and administers its own construction codes through its Development Services Department / Building Services Division; it does not defer permitting to Maricopa County. Source: City of Avondale Building Services Division page (avondaleaz.gov/government/departments/development-services/building-division/).; 2024 International Building Code (IBC), as published by the International Code Council, adopted by reference with City of Avondale amendments. Effective January 1, 2026 (per the City's 'Current Adopted Building Codes (effective January 1, 2026)' list). Source: City of Avondale Building Services Division page; City of Avondale Building Code Adoption ordinance document ('Building-Code-Adoption-Final.pdf').; 2024 International Residential Code (IRC), adopted by reference with City of Avondale amendments, effective January 1, 2026. Source: City of Avondale Building Services Division page; City of Avondale Building Code Adoption ordinance document.; 2024 International Existing Building Code (IEBC), adopted by reference with City of Avondale amendments, effective January 1, 2026. Source: City of Avondale Building Services Division page.; 2023 National Electrical Code (NEC), as published by the National Fire Protection Association, adopted with City of Avondale amendments (note: electrical code cycle is one edition behind the 2024 ICC set), effective January 1, 2026. Source: City of Avondale Building Services Division page; City of Avondale Building Code Adoption ordinance document (Avondale Amendments to the 2023 National Electrical Code).; 2024 International Mechanical Code (IMC), adopted by reference with City of Avondale amendments, effective January 1, 2026. Source: City of Avondale Building Services Division page.; 2024 International Plumbing Code (IPC), adopted by reference with City of Avondale amendments, effective January 1, 2026, including a burial-depth amendment to G2415.12/IFGC 404.12 and added stub-out/push-to-connect-valve provisions (P2605.1.1, P2605.1.2). Source: City of Avondale Building Code Adoption ordinance document.; 2024 International Fuel Gas Code (IFGC), adopted by reference with City of Avondale amendments, effective January 1, 2026. Source: City of Avondale Building Services Division page.; 2024 International Energy Conservation Code (IECC), adopted by reference with City of Avondale amendments, effective January 1, 2026 (Manual J design criteria: elevation 1,101 ft, latitude 34°, outdoor summer design dry-bulb 108°F, outdoor winter design dry-bulb 33°F). Source: City of Avondale Building Services Division page; City of Avondale Building Code Adoption ordinance document.; 2024 International Property Maintenance Code (IPMC), adopted by reference, effective January 1, 2026. Source: City of Avondale Building Services Division page.; 2024 International Swimming Pool and Spa Code (ISPSC), adopted by reference with City of Avondale amendments (including an amended barrier-height provision requiring a minimum 60-inch/5-foot barrier height, up from the model code's 48 inches), effective January 1, 2026. Source: City of Avondale Building Services Division page; City of Avondale Building Code Adoption ordinance document (Avondale Amendments to the 2024 ISPSC, Section 305.2.1); City of Avondale Swimming Pool Requirements handout (rev. 10.26.2023).; All work must be performed by a contractor licensed with the Arizona Registrar of Contractors (ROC), unless the property owner qualifies as an owner-builder under A.R.S. § 32-1121 (Building Permit Application, Standard Conditions and Applicant Certification, rev. 05.06.2026). Source: City of Avondale Building Permit Application.. Local amendments apply — see the Avondale overview page for the full list.