Do I need a permit to replace my air conditioner in Gilbert?

Not if it is a like-for-like replacement performed by an Arizona licensed contractor — exempt per Gilbert's local amendment IBC §105.2 Mechanical item 8. New equipment installations, system modifications, and ductwork changes require a permit.

Mechanical / HVAC Permit in Gilbert, Arizona

Required for installation, alteration, repair, and replacement of mechanical and HVAC systems in the Town of Gilbert. Governed by the 2018 IMC with Town of Gilbert amendments. Like-for-like HVAC equipment replacements by Arizona licensed contractors are exempt from permit per IBC §105.2 item 16 (cross-referenced in Mechanical item 8). New HVAC installations, significant alterations, and ductwork changes require a permit.

Verified 2026-06-29 · Source

When you need this permit

Submit through OneStopShop portal at onestopshop.gilbertaz.gov
Arizona ROC-licensed mechanical contractor required (owner-builder exemptions may apply for owner-occupied residential)
Work must comply with 2018 IMC as amended by Town of Gilbert Technical Codes 2020 Edition
Like-for-like HVAC equipment replacements by AZ licensed contractors are exempt from permit (IBC §105.2 Mechanical item 8, cross-reference to Building item 16)

Required documents

Req
Mechanical Permit Application
Permit application submitted through OneStopShop at onestopshop.gilbertaz.gov
Opt
Mechanical Plans
Required for new installations and significant alterations; like-for-like replacements may qualify for OTC

Fee schedule

Fee type	Amount	Notes
Individual Mechanical Permit (Residential) — flat fee	$150	Source: Town of Gilbert Development Services Fee Schedules (doc 5883), Applied Miscellaneous Building Fees — Individual Mechanical Permit, Residential, effective July 1, 2025, Resolution 4563.
Individual Mechanical Permit (Commercial) — flat fee	$300	Source: Town of Gilbert Development Services Fee Schedules (doc 5883), Applied Miscellaneous Building Fees — Individual Mechanical Permit, Commercial, effective July 1, 2025, Resolution 4563.
Building Permit Fee — valuation-based (for larger mechanical projects)	Same valuation-based table as building permits; $50.00 minimum for work valued $1.00–$1,100.00	Source: Town of Gilbert Development Services Fee Schedules (doc 5883), Building Permit and Plan Review Fees Table, effective July 1, 2025, Resolution 4563.
Plan Review Fee (where plan review is required)	65% of the calculated Building Permit Fee	Source: Town of Gilbert Development Services Fee Schedules (doc 5883), effective July 1, 2025, Resolution 4563.
Re-inspection Fee	$150	Source: Town of Gilbert Development Services Fee Schedules (doc 5883), Applied Miscellaneous Building Fees, effective July 1, 2025, Resolution 4563.

Review timeline

3–3 business days

Gilbert’s published plan-review target

Inspection process

1
Rough Mechanical Inspection
Inspection of mechanical rough-in before concealment
2
Final Mechanical Inspection
Final inspection confirming all mechanical work complete and compliant

Tips

Like-for-like HVAC equipment replacements by an Arizona licensed contractor are exempt from permit per Gilbert's local amendment IBC §105.2 Mechanical item 8.
OTC (Over the Counter) review may be available for gas lines and like-for-like change-outs per the Plan Review Programs document.
Commercial electric, plumbing, and mechanical permit reviews have a 3/3 working-day goal.
Individual flat-fee mechanical permits: $150 residential, $300 commercial (adopted July 1, 2025).

Frequently asked questions

Do I need a permit to replace my air conditioner in Gilbert?: Not if it is a like-for-like replacement performed by an Arizona licensed contractor — exempt per Gilbert's local amendment IBC §105.2 Mechanical item 8. New equipment installations, system modifications, and ductwork changes require a permit.

Sources & verification

Verified against official sources. Last reviewed 2026-06-29.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Gilbert building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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