Setback rules by tank size
- Under 125 gal water capacity: 0 ft minimum from buildings (with restrictions on openings and ignition sources). Can sit against a wall.
- 125–500 gal water capacity: 10 ft from buildings, 10 ft from property lines
- 501–2,000 gal water capacity: 25 ft from buildings, 25 ft from property lines
- Underground (residential range): 10 ft from buildings and property lines regardless of size
Setbacks from openings and ignition sources
Beyond the tank-to-building distance, additional setbacks apply to specific features:
- Fill valve and vents: minimum 10 ft from any building opening (door, window, vent) or ignition source
- Air-conditioning condensers and electrical equipment: typically 3–10 ft minimum depending on configuration
- Combustible materials (wood piles, debris): 10 ft clear zone around the tank
Property line setbacks
The property-line setback is a constraint many homeowners overlook. A 500-gal tank placed too close to the property line could force a relocation if a neighbouring landowner builds within 10 ft of the line. NFPA 58 setbacks apply to the structure, so the relevant measurement is from your tank to any current or potential neighbouring building location.
Local jurisdiction overrides
NFPA 58 is the national baseline. Many US jurisdictions adopt it directly; some impose stricter rules via state fire code amendments, county zoning, or municipal ordinances. Coastal flood zones, wildfire interface zones, and dense urban areas sometimes have additional restrictions. Always check local rules before installation — your installer should know them.
FAQ
How far does a propane tank need to be from a house?
For a typical residential 500-gallon aboveground tank: 10 ft minimum from the house and from property lines. For 1,000-gallon tanks: 25 ft. Underground tanks: 10 ft regardless of size.
Can I put a propane tank next to my AC unit?
Typically not closer than 10 ft, though specific configurations vary by jurisdiction. Air-conditioning condensers spark and arc internally and qualify as ignition sources under NFPA 58. Confirm with your installer.
What happens if my tank violates setback rules?
Insurance, permit revocation, and dealer-imposed relocation are the typical consequences. Many dealers refuse to fill tanks that violate NFPA 58 setbacks because doing so creates liability for the dealer.