If you’ve ever stood in the plumbing aisle wondering whether the project in your head needs a stamp from the city, you’re not alone. Permits are one of the murkier parts of owning a home, and the answer in California isn’t “it depends on how much it costs.” It depends on what kind of work you’re doing.
Here’s how to think about it, plus a few things that trip up Bay Area homeowners in particular.
The basic rule: permits follow the work, not the price
California uses the California Plumbing Code, which is adopted statewide and then enforced locally by your city or county building department. The code draws a line between two kinds of jobs.
On one side is repair and maintenance: keeping existing fixtures and pipes working. On the other side is new, altered, or replaced systems: anything that changes the plumbing itself.
Maintenance usually doesn’t need a permit. Replacing or changing the system usually does. That single distinction explains most of the confusion.
Work that typically does NOT need a permit
These jobs are generally considered repairs, and most jurisdictions let you do them without pulling anything:
- Clearing a clogged drain or toilet
- Replacing a faucet, showerhead, or angle stop
- Swapping out a toilet’s internal parts (flapper, fill valve)
- Fixing a small leak at a fitting
- Replacing a garbage disposal in the same location
The common thread is that you’re not opening up walls, not running new pipe, and not touching gas. You’re returning something to working order.
Work that typically DOES need a permit
Once a project changes the plumbing system, the building department wants to see it. Common examples:
- Water heater replacement. This is the big one. Even a straight like-for-like swap almost always needs a permit, because it touches gas or electrical, venting, the relief line, and seismic strapping. More on this below.
- Repiping a house or a section of it (for example, replacing old galvanized supply lines)
- Moving or adding fixtures, like relocating a sink, adding a bathroom, or running plumbing to a new laundry area
- New or replaced drain, waste, and vent piping behind the walls
- Sewer lateral repair or replacement (the pipe from your house to the city main)
- Water service line replacement from the meter to the house
- Re-piping for a remodel, including kitchen and bathroom renovations
If your project involves new pipe inside walls or under the slab, gas connections, or anything affecting the sewer or water service, assume a permit is required and confirm with your local office.
Why water heaters surprise so many people
People replace a water heater and think of it like swapping an appliance. The building department doesn’t see it that way. A new water heater installation is checked for several code items: proper venting (so combustion gases vent safely), a correctly run temperature and pressure relief discharge line, a drip pan where required, an expansion tank in some cases, and seismic strapping, which matters a lot here. California is earthquake country, and an unstrapped tank can tip, rupture a gas line, or break a water line during a quake.
A permit and inspection exist to catch those things. It’s not bureaucratic box-checking; it’s the difference between a safe install and a hidden hazard.
Permits are local, so rules vary across the Bay Area
There’s no single “Bay Area permit.” Each jurisdiction issues its own. A homeowner in Pleasanton deals with the City of Pleasanton; someone in Oakland or Berkeley goes through their city; and a home in unincorporated Contra Costa or Alameda County goes through the county. Fees, forms, and online portals differ. The underlying plumbing code is the same statewide, but the front desk you deal with is not.
When you’re planning a job, the fastest move is to call or visit your specific city or county building department and describe the work. They’ll tell you whether it needs a permit and what the process looks like.
Two Bay Area wrinkles worth knowing
The EBMUD private sewer lateral program. If your home is served by EBMUD (much of Oakland, Berkeley, and the inner East Bay), there’s a regional requirement to test and, if needed, repair or replace your private sewer lateral, often triggered at the point of sale or during major work. That lateral work is permitted work, and a compliance certificate may be required to close a sale. If you’re buying or selling in the EBMUD service area, factor this in early.
Older housing stock. A lot of Bay Area homes still have galvanized steel supply lines or early copper. When those reach the end of their life, the fix is usually a repipe, which is permitted work. The same goes for clay or cast-iron sewer laterals on older properties, which are common candidates for replacement.
Why an unpermitted job can haunt you later
Skipping a required permit can feel harmless when the work looks fine and the water runs. The trouble shows up later.
When you sell, home inspectors and buyers’ agents often notice work that doesn’t match permit records. You may be asked to “legalize” it retroactively, which can mean opening up finished walls so an inspector can see what’s behind them. Insurance can get complicated too, if a failure traces back to unpermitted work. And from a pure safety standpoint, the inspection you skipped was the one chance for a second set of eyes on a gas or sewer connection.
Permits also protect you. The record shows the work was done to code, which is exactly what a future buyer wants to see.
Can you pull your own permit?
In California, a homeowner can generally pull a permit for work on their own primary residence under the owner-builder provisions. That said, many people have a licensed plumber handle both the work and the permit, since the contractor knows the local process and stands behind the result. Rental and investment properties usually have different rules, so check before assuming you can self-permit.
When to call a licensed plumber, and how to verify one
For anything beyond a simple repair, especially water heaters, gas work, repipes, slab or under-floor drains, and sewer or water service lines, it’s worth bringing in a licensed plumber. They’ll know whether your specific city or county requires a permit, how to pull it, and what code upgrades the inspector will look for.
Before you hire anyone, verify their license. California’s Contractors State License Board lets you look up any contractor by name or license number at cslb.ca.gov, where you can confirm the license is active, in the right classification, and free of major issues. It takes two minutes and it’s the single best way to protect yourself.
This guide is general homeowner education, not a substitute for advice from your local building department or a licensed professional. Codes change and local rules vary, so confirm the specifics for your address before you start.