Most homeowners discover plumbing permits exist during escrow, when a buyer’s inspector flags work done years earlier by someone who skipped the paperwork. Knowing what needs a permit — and who issues it — saves that conversation.
What generally requires a permit
Requirements vary by jurisdiction, so confirm locally, but across these cities the pattern is consistent:
- Water heater replacement — yes, including a straight like-for-like swap. This is the one people most often assume is exempt.
- Repiping — replacing supply lines.
- Sewer lateral repair or replacement.
- Adding or relocating fixtures — anything that changes the drain, waste or vent layout.
- Gas line work — new lines, extensions, relocations.
- Water service line replacement.
Generally exempt: like-for-like faucet, toilet or disposal swaps, and clearing blockages. Repairing a leak in an existing line usually doesn’t need one; replacing the run does.
Who to contact
San Dimas and La Verne both run their own building divisions handling permits within city limits. Pomona likewise, and as the largest of the three it has the busiest counter — build in extra time. Glendora, Claremont and Covina each administer their own. Unincorporated pockets between these cities fall to LA County Public Works rather than any city, which catches people out — being “in San Dimas” by postal address doesn’t always mean being in the city.
Check the parcel, not the mailing address, if you’re near a boundary. Fees and turnaround differ by jurisdiction, so ask when you call rather than assuming.
What inspectors check on a water heater
This is the most frequently permitted job, and the most frequently failed. Expect them to look at:
- Seismic strapping at two points — upper third and lower third — with the lower strap clear of the controls.
- A thermal expansion tank where a pressure regulator or check valve creates a closed system.
- T&P relief valve discharge running downward, full-size, terminating at an approved location, never capped or threaded at the end.
- Correct venting, properly sloped and sized, with no back-pitch.
- Adequate combustion air, and appropriate clearances for the installation type.
- A drain pan with drainage where a leak could damage the structure.
- A compliant low-NOx unit, per the regional air district.
Our fuller walkthrough of water heater code requirements in LA County goes into each of these.
Why it matters beyond compliance
A permit creates a record. When you sell, that record answers the inspector’s question before it’s asked. Without it, unpermitted work can hold up a sale, get renegotiated against your price, or require retroactive permitting at a worse rate.
Insurance is the other reason. Where a claim traces back to unpermitted work, carriers have grounds to dispute it.
The contractor question
A licensed contractor pulls the permit as part of the job and it appears on your invoice. If a quote is notably cheaper than the others, ask directly whether a permit is included — that’s usually where the difference is. Anyone who tells you a replacement doesn’t need one is either uninformed or hoping you are.
We pull permits on every job that needs one. Water heater replacement and repiping across La Verne, Pomona, Covina and San Dimas. Call (949) 355-5640.
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