HVAC Permit in Pima County, Arizona
It depends
Sometimes, depending on the project
For installation or replacement of a central air conditioner, furnace, mini-split, or duct work in unincorporated Pima County
Issued byPima County Development Services Department
By Mario Bailey, verified against official sources
Quick answer
Pima County's official "Do I Need a Permit?" list requires a mechanical permit for a central air conditioner or furnace, a mini-split system, and modifying or replacing duct work. It exempts portable cooling units, portable evaporative coolers, portable heating appliances, portable ventilation equipment, and replacing an existing evaporative cooler with a like unit. Water heater and A/C replacements that keep the same size and fuel type may be processed through the Alliance of Construction Trades expedited replacement permitting program via the county's online portal.
Typical threshold: New or replacement central air conditioners/furnaces, mini-split systems, and modifying or replacing duct work require a permit; portable cooling, heating, or ventilation units, and replacing an existing evaporative cooler with a like unit, do not.
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When a permit is usually needed
For installation or replacement of a central air conditioner, furnace, mini-split, or duct work in unincorporated Pima County
What an HVAC permit costs in Pima County
How Pima County compares in Arizona
| Jurisdiction | Permit needed? | Threshold |
|---|---|---|
| Chandler | It depends | Like-for-like replacement of an evaporative cooler (equal or lesser airflow, same location) or of gas-fired air-conditioning equipment, direct-vent equipment, furnaces, or log lighters (equal or lesser BTU, same location) is exempt from a permit; new HVAC installations or non-like replacements require a permit. |
| Gilbert | Permit required | Gilbert's amended IRC R105.2 mechanical exemption list includes a replacement-based exemption and cross-references the exemption for water heating appliance replacements by an Arizona licensed contractor. |
| Maricopa County | Permit required | Not specified |
| Mesa | Permit required | Not specified |
| Peoria | It depends | Like-for-like replacement by a licensed contractor of an outdoor refrigeration unit of 5 tons or less is exempt, while replacement of equipment located inside the building and any new or altered mechanical system requires a permit. |
| Phoenix | Permit required | Not specified |
| Pima Countythis page | It depends | New or replacement central air conditioners/furnaces, mini-split systems, and modifying or replacing duct work require a permit; portable cooling, heating, or ventilation units, and replacing an existing evaporative cooler with a like unit, do not. |
How to apply in Pima County
In Pima County, a residential HVAC (mechanical) permit application must identify the covered equipment and scope of work, since installing, altering, or replacing a heating or cooling system is regulated work that cannot start until the application is submitted and the permit issued. The equipment itself must be picked by a real sizing calculation rather than a rule of thumb.
What most HVAC permit applications include:
- For Pima County, a mechanical permit is required before anyone may install, alter, repair, remove, convert, or replace a heating, ventilating, or air conditioning system regulated by the code, and the work may not begin until the application is submitted and the permit is issued (IRC R105.1).
- For Pima County, the application identifies the specific equipment being installed, such as a furnace, heat pump, or air conditioner, since the unit must be installed according to its listing and the manufacturer's installation instructions (IRC M1401.1).
- For Pima County, the proposed equipment location must leave the clearances needed to clean coils and replace filters, blowers, motors, and controls after installation (IRC M1401.2).
- For Pima County, the application carries the equipment sizing basis: ACCA Manual J building loads and Manual S equipment selection, or another approved sizing method, not a rule of thumb (IRC M1401.3).
- For a split system, the work covered by the permit includes refrigerant suction line insulation, since the piping is inspected against that standard once installed (IRC M1411.6).
General submittal guidance from International Residential Code (IRC), 2021 edition, Chapter 1 (Permits) and Chapter 14 (Heating and Cooling Equipment and Appliances). Source. Pima County Development Services Department sets the exact checklist for Pima County.
Where to apply in Pima County:
Pima County Development Services Department
- 201 N. Stone Ave., Tucson, AZ 85701
- Phone: 520-724-9000
HVAC Permit in Pima County compared with nearby Arizona localities
| Locality | Permit needed? | Threshold | What each Arizona schedule says | Verified |
|---|---|---|---|---|
| Pima County | It depends | New or replacement central air conditioners/furnaces, mini-split systems, and modifying or replacing duct work require a permit; portable cooling, heating, or ventilation units, and replacing an existing evaporative cooler with a like unit, do not. | Flat fee tiered by scope: minor work such as a residential air conditioner unit is $27... | |
| Chandler | It depends | Like-for-like replacement of an evaporative cooler (equal or lesser airflow, same location) or of gas-fired air-conditioning equipment, direct-vent equipment, furnaces, or log lighters (equal or lesser BTU, same location) is exempt from a permit; new HVAC installations or non-like replacements require a permit. | No HVAC or mechanical-specific fee line, mechanical permits are billed as a standard... | |
| Gilbert | Permit required | Gilbert's amended IRC R105.2 mechanical exemption list includes a replacement-based exemption and cross-references the exemption for water heating appliance replacements by an Arizona licensed contractor. | Individual Mechanical Permit, residential: $150 (fee schedule revised 7/1/2026). | |
| Maricopa County | Permit required | Not specified | Flat fee of $50 for mechanical work under the Minor Self Service flat rate schedule, per... | |
| Mesa | Permit required | Not specified | Stand-alone mechanical work is valuation based via the Residential Rate Table, $220... |
Inspections and closing out your permit
In Pima County, mechanical work gets a rough in inspection after the ductwork, refrigerant lines, and gas piping are in but before they are covered or concealed, followed by a final inspection that confirms the equipment operates correctly and its clearances, combustion air, and condensate disposal are in place. A straight equipment changeout with no new ductwork commonly gets a single final inspection instead of a separate rough in trip.
- In Pima County: rough inspection of the mechanical and gas systems must be made before the work is covered or concealed, before fixtures or appliances are set or installed, and before the framing inspection (IRC R109.1.2).
- In Pima County: where a cooling coil is added to an existing warm air furnace, the rough in confirms the coil is not installed upstream of the heat exchanger unless the furnace is listed for it, and that the blower can handle the added static pressure (IRC M1411.2).
- In Pima County: the rough in and final both confirm the appliance access opening and working space are large enough to service the unit (IRC M1305.1).
- In Pima County: at final inspection, the inspector verifies the equipment has adequate combustion air, with openings kept clear for the distance the code requires (IRC M1402.3).
- In Pima County: final inspection also checks that the condensate line drains to an approved point of disposal with the required slope and does not create a nuisance (IRC M1411.3).
- In Pima County: for a straight equipment changeout with no new ductwork, many permit offices require only a single final inspection, while a new installation still gets a rough in inspection before the final (common local inspection practice).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the Pima County permit portal or by phone at 520-724-9000.
Inspection sequence from International Residential Code (IRC), 2021 edition, Section R109 (Required Inspections) and Chapter 14 (Heating and Cooling Equipment and Appliances). Source. An open permit left un-inspected can surface later in a title search or home sale.
Your HVAC Permit checklist for Pima County
- Confirm the requirement. Sometimes, depending on the project. Typical threshold: New or replacement central air conditioners/furnaces, mini-split systems, and modifying or replacing duct work require a permit; portable cooling, heating, or ventilation units, and replacing an existing evaporative cooler with a like unit, do not. Usually needed: For installation or replacement of a central air conditioner, furnace, mini-split, or duct work in unincorporated Pima County.
- Budget the fee. Flat fee tiered by scope: minor work such as a residential air conditioner unit is $27, moderate work such as multiple mechanical units, ducts, or re-piping a single family dwelling is $198, per the Development Services Fee Schedule effective 2026-07-01. Official fee schedule.
- Apply. In Pima County, a residential HVAC (mechanical) permit application must identify the covered equipment and scope of work, since installing, altering, or replacing a heating or cooling system is regulated work that cannot start until the application is submitted and the permit issued. The equipment itself must be picked by a real sizing calculation rather than a rule of thumb. Start at the Pima County permit portal.
- Keep the office details handy. Pima County Development Services Department. Phone: 520-724-9000. Address: 201 N. Stone Ave., Tucson, AZ 85701.
- Plan for inspections. In Pima County, mechanical work gets a rough in inspection after the ductwork, refrigerant lines, and gas piping are in but before they are covered or concealed, followed by a final inspection that confirms the equipment operates correctly and its clearances, combustion air, and condensate disposal are in place. A straight equipment changeout with no new ductwork commonly gets a single final inspection instead of a separate rough in trip.
Compiled from the official sources on this page. Last checked .
Frequently asked questions
- Do you need an HVAC permit in Pima County?
- Pima County's official "Do I Need a Permit?" list requires a mechanical permit for a central air conditioner or furnace, a mini-split system, and modifying or replacing duct work. It exempts portable cooling units, portable evaporative coolers, portable heating appliances, portable ventilation equipment, and replacing an existing evaporative cooler with a like unit. Water heater and A/C replacements that keep the same size and fuel type may be processed through the Alliance of Construction Trades expedited replacement permitting program via the county's online portal. New or replacement central air conditioners/furnaces, mini-split systems, and modifying or replacing duct work require a permit; portable cooling, heating, or ventilation units, and replacing an existing evaporative cooler with a like unit, do not. Always confirm with the office before starting.
- How much does an HVAC permit cost in Pima County?
- Flat fee tiered by scope: minor work such as a residential air conditioner unit is $27, moderate work such as multiple mechanical units, ducts, or re-piping a single family dwelling is $198, per the Development Services Fee Schedule effective 2026-07-01. See the official fee schedule for current amounts.
- Where do you apply for an HVAC permit in Pima County?
- You can apply through the Pima County permit portal or contact the Pima County Development Services Department directly. The links are listed on this page.
- Can a homeowner pull an HVAC permit themselves in Pima County?
- Under Arizona law (A.R.S. 32-1121(A)(5), (A)(9), (A)(14)(a); 32-1164(A)(2), (B)): Arizona addresses owner-builders through its contractor licensing law rather than through the building code itself. A.R.S. 32-1121(A)(5) exempts property owners who build or improve structures on their own land and do the work themselves, with their own employees, or with duly licensed contractors, as long as the finished structure is for the owner's own occupancy and is not intended for sale or rent. Selling or renting within one year of completion or of the certificate of occupancy is prima facie evidence the project was really undertaken for sale or rent, which defeats the exemption, a rule that functions much like Florida's one-year restriction. The exemption does not waive the underlying permit requirement: several of the chapter's small-job licensing exemptions, including the $1,000 casual-work exemption in A.R.S. 32-1121(A)(14), expressly do not apply whenever the work requires a local building permit, so once a job needs a permit, anyone doing that work for someone else generally must hold an Arizona contractor's license regardless of dollar amount. Acting as a contractor without a license, on permit-required work or otherwise, is a class 1 misdemeanor under A.R.S. 32-1164, carrying a mandatory minimum fine of $1,000 for a first offense and $2,000 for a repeat offense. Confirm how Pima County applies this before you apply.
From the Library
What else needs a permit in Pima County
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Deck Permit | It depends | Decks and non-structural flat work not more than 30 inches above adjacent grade, not over any basement or story below, and not part of an accessible route do not require a permit; a deck greater than 30 inches above finished grade or floor level requires a permit. | Assessed as a building permit: base fee $69 plus 1.096% of the ICC square foot... |
| Electrical Permit | It depends | New electric outlet/fixture installations and photovoltaic systems or generators require a permit; wiring/devices operating under 25 volts and not exceeding 50 volt-amps, and like-for-like repair or replacement of switches, controls, overcurrent devices, fixed motors, transformers, or outlets/fixtures in the same location, do not. | Flat fee tiered by scope: minor work such as a service upgrade, reconnect, or up to five... |
| Fence Permit | It depends | Non-retaining walls and fences no more than 7 feet in height do not require a permit; fences taller than 7 feet require a building permit. | Fee is $0.25 per lineal foot plus the standard $69 base permit fee, per the Development... |
| Patio Permit | It depends | An open, ground-level patio slab counts as non-structural flat work not more than 30 inches above adjacent grade and does not require a permit; enclosing a porch or patio (adding walls, screens, or a roof enclosure) requires a permit. | No patio-specific line |
| Plumbing Permit | It depends | New pipe work, propane tanks, septic systems, sewer connections, solar water heaters, water heater replacement, and new dishwashers require a permit; clearing stoppages or repairing leaks that do not involve replacing valves, pipes, or fixtures, fixture swaps (sinks, toilets, tubs), and grade-supported water tanks up to 5,000 gallons do not. | Flat fee tiered by scope: minor work such as a water heater or a gas, water, or drain... |
| Pool Permit | It depends | Pre-fabricated residential pools installed entirely above ground require a building permit once they exceed 18 inches in depth and 5,000 gallons; any in-ground or custom-built residential pool or spa requires a building permit through Administrative Review regardless of size. | Not published |
| Roof Replacement Permit | It depends | Re-roofing with like materials (tile, shingles, etc.) does not require a permit; structural roof work requires a permit. | No fee for re-roofing with like materials since no permit is required per the county's... |
| Shed Permit | It depends | One-story detached tool and storage sheds, playhouses, and similar non-habitable accessory structures are the category Pima County's own adopted code amendments refer to as "structures exempted from permits"; the standard exemption size carried in the adopted IRC for this category is 200 sq ft with no electrical, plumbing, or mechanical connections, though Pima's own published guidance pages do not restate that figure directly. | No shed-specific line |
| Solar Permit | Permit required | Not specified | Residential photovoltaic installation is treated as minor electrical work, flat fee $27... |
HVAC Permit in other Arizona localities
Everything above, sourced
Code references
National and state model-code sections the general guidance on this page is drawn from. They are not Pima County documents; the office above sets the local rules.
How this HVAC permit page for Pima County was verified. 2 official sources: pima.gov, pima.gov; fee schedule: official document. Last checked by Mario Bailey, not confirmed with Pima County Development Services Department. Rules change; confirm before you build. How we verify.
Last checked: Report an error on this page