Do you need a fire permit for a propane (LP-gas) tank in Phoenix?

Section 105.6.16 of the Phoenix Fire Code (the 2024 International Fire Code with Phoenix amendments, effective February 17, 2026) reads: "A construction permit is required for installation, alteration or modification of an LP-gas system including:"

1. 1"LP-gas containers with an aggregate water capacity of 125 gallons (473 L) or more used exclusively for vapor service."
2. 2"Racks storing 20-pound cylinders for the purpose of conducting an LP-gas exchange program at a specific site."
3. 3"LP-gas containers used for liquid transfer service."
4. 4"Individual containers less than 125-gallon (473 L) water capacity serving occupancies in Group R-3, exclusively for vapor service."

The packet notes item 4 was "added at industry request."

Section 6101.3 adds a paperwork step: "Where an LP-gas container is more than 125 gallons (473 L) in water capacity, the installer shall submit construction documents for such installation." The packet's reason says this changed "from OTC permit to required plan review due to the nature and hazard of the product."

Storing and using LP-gas is a separate question. Section 105.5.30 requires an operational permit for "Storage and use of LP-gas," with exceptions that include individual containers of 500 gallons or less (or multiple-container systems totaling 500 gallons or less), containers serving Group R-3, and vapor service under 2,000 gallons.

In short:

• Installing, altering or modifying an LP-gas system needs a construction permit.
• That includes tanks of 125 gallons or more in vapor service, exchange racks, liquid transfer containers and, in Phoenix, small vapor-service tanks at homes.
• Over 125 gallons, the installer submits construction documents for review.
• An operational permit for storage and use is a separate requirement with its own exceptions.

• LP-gas: liquefied petroleum gas, which includes propane.
• Vapor service: the system draws gas vapor from the tank to feed appliances.
• Liquid transfer service: a tank used to fill other containers or vehicles with liquid LP-gas.
• Group R-3: the code's occupancy group that includes one- and two-family homes.
• Water capacity: the volume the tank holds if filled with water, the standard way tank size is stated.

Owners and installers of LP-gas systems at homes, restaurants, retailers with cylinder exchange racks, and businesses that fill containers. The fire code's compressed gas chapter says "LP-gas shall comply with Chapter 61 and the International Fuel Gas Code," so the fuel gas side still applies.

This page covers LP-gas under the fire code's Chapter 61; natural gas service is outside that chapter. It also does not replace the building permit for gas piping from the tank to appliances: Phoenix's building code requires a rough-in or underground inspection for "all water and gas distribution systems prior to their being buried or concealed."

• A homeowner in Ahwatukee adds a propane pool heater. The 120-gallon tank is under 125 gallons, but it serves a house in vapor service, so item 4 applies and the Fire Department permit is required. No construction documents are needed at that size under 6101.3.
• A taqueria sets a 500-gallon tank behind the building. The answer changes at the 125-gallon line: the installer now submits construction documents, and the fee schedule's tank line for 126 to 1,999 gallons charges plan review (minimum $390) and inspection (minimum $195).
• The same homeowner later adds a gas line to an outdoor kitchen. The code does not list appliance additions by name, but reading it as an alteration of the LP-gas system brings the construction permit back, and the new piping is inspected before it is covered.

1. 1Find the tank's water capacity on its data plate and whether it is vapor or liquid service.
2. 2Check the four items in 105.6.16; if any applies, the job needs a Fire Department construction permit.
3. 3For a container over 125 gallons, have the installer prepare construction documents for review.
4. 4Budget the official fees from the Phoenix Fire Prevention Fee Schedule (effective January 20, 2026).
5. 5Pull the separate gas piping permit for lines to appliances, and have the piping inspected before it is buried or covered.
6. 6Ask whether storage and use also needs an operational permit under 105.5.30.

• "Small home tanks don't need a permit." Phoenix added item 4 for containers under 125 gallons serving Group R-3 in vapor service.
• "The propane company's delivery is the inspection." Section 105.6.16 requires a construction permit for the system itself.
• "Only the tank needs a permit." The fire code covers alteration or modification of the whole LP-gas system, and gas piping has its own permit and inspections.