Do I need a permit to replace a water heater in California?
Short answer: yes. In California, swapping a water heater is regulated plumbing work, so it needs a permit. A like-for-like replacement still counts. The good news is it is usually a quick, low-cost permit, and a real installer will handle it for you.
Why a simple swap still needs a permit
A water heater ties into your water, your gas or electrical, and a vent. The permit is not red tape for its own sake. It is what gets the install inspected so the gas connection, the venting, and the relief valve are done right. A bad water heater install is how you get a gas leak or a flooded garage, so the state treats even a straight replacement as work that gets a permit and an inspection.
The strapping California requires
This is the part out-of-state guides miss. California law requires every residential water heater to be braced or strapped against earthquakes, and that includes replacements and existing units, not just new construction. The straps go around the upper and lower third of the tank, with the lower strap a few inches above the controls. If your installer is not strapping it, that is a red flag.
Who pulls the permit
Normally the licensed plumber or contractor doing the install pulls the permit and meets the inspector. If someone quotes you a water heater and tells you no permit is needed, ask why. The honest answer in California is that one is required, and a pro who pulls permits is a pro who stands behind the work.
If it failed and you need hot water now
If your heater dies and has to be replaced in an emergency, you do not have to wait days for a permit office to open. The rule lets the install happen and the permit get filed the next business day. So an emergency is not an excuse to skip the permit, it just changes the timing.
Always check your city or county
Permit fees, whether it is an over-the-counter permit, and the exact inspection steps vary by local building department. The requirement to get a permit is statewide. The how and how much is local. A two-minute call to your building department settles it.
Common questions
Do I need a permit to replace a water heater in California?
Yes. Water heater replacement is regulated plumbing work in California and requires a permit, even for a like-for-like swap. The licensed installer usually pulls it.
Does California require water heater strapping?
Yes. State law requires residential water heaters to be strapped or braced against earthquakes, including replacements and existing units, with straps around the upper and lower third of the tank.
Can I replace a water heater myself without a permit?
A permit is still required even if you do the work yourself. Many jurisdictions also limit gas and water heater work to licensed professionals, so check with your local building department first.