Cerritos Plumbing Permits: When You Need One and What to Expect

Plumbing permits exist for a reason that benefits homeowners: they require that significant work be inspected by the city to confirm it meets code, which protects the home, future owners, and the surrounding community. In Cerritos, the City of Cerritos Building and Safety Division administers plumbing permits and inspections. Knowing which work requires a permit, which does not, and what the process involves helps homeowners avoid the surprise of discovering unpermitted work at exactly the wrong time, such as during a home sale or an insurance claim.

Work that requires a City of Cerritos permit

The general principle in California municipalities, including Cerritos, is that work which alters the plumbing system, adds to it, or replaces significant components requires a permit, while simple like-for-like fixture maintenance generally does not. The specific categories of plumbing work that typically require a permit in Cerritos include:

Whole-home repiping. Replacing the supply piping throughout the home is a permitted activity. The permit ensures the new system is inspected before walls are closed, confirming the materials, connections, and pressure testing meet code. A repipe done without a permit is a significant unpermitted modification to the home’s core systems.

Slab leak repair that opens the concrete. Opening the foundation slab to access and repair a supply line is permitted work because it involves both the plumbing system and the structural slab. The permit and inspection confirm the repair and the slab restoration are done correctly.

Sewer lateral repair or replacement. Work on the sewer lateral from the building to the city main connection requires a permit. This is significant underground work affecting the sanitary system and the connection to the public sewer, and the inspection confirms proper slope, materials, and connection.

New gas line installation or modification. Any work that adds, extends, or significantly modifies the gas piping system requires a permit. Gas work carries safety implications that make inspection particularly important, and gas line work for a new appliance location or a tankless water heater upsizing falls into this category.

New fixture locations and additions. Adding a fixture where none existed (a new bathroom, a wet bar, a laundry hookup in a new location) requires a permit because it adds to the plumbing system. This includes the supply and drain work for the new fixture.

Water heater replacement. In most California jurisdictions, including Cerritos, replacing a water heater requires a permit. This is because water heater installation involves code requirements for seismic strapping, the temperature and pressure relief valve and its discharge piping, combustion air and venting for gas units, and the connections. The permit confirms these safety elements are correct.

Work that typically does not require a permit

Simple maintenance and like-for-like replacement in the same location generally does not require a permit in Cerritos. This typically includes: replacing a faucet with a new faucet in the same location, replacing a toilet with a new toilet in the same location, clearing a clogged drain, repairing or replacing a garbage disposal, replacing a fixture supply valve or angle stop, and similar maintenance activities that do not alter the plumbing system layout or add to it.

The distinction is between maintaining or replacing what exists in place (generally no permit) versus altering, adding to, or replacing major components of the system (generally permit required). A homeowner replacing a leaking kitchen faucet does not need a permit. A homeowner adding a pot filler over the stove, which requires running a new supply line, generally does. When in doubt, the City of Cerritos Building and Safety Division can confirm whether a specific job requires a permit, and a licensed plumber will know the requirement for the work being quoted.

The inspection process and timing

When permitted work is performed, the process generally follows this sequence: the contractor (or homeowner, for owner-performed work) pulls the permit from the City of Cerritos Building and Safety Division before work begins; the work is performed to code; and a city inspector inspects the work at the required stage. For work that will be concealed (like repipe lines in walls or a sewer lateral in the ground), the inspection happens before the work is covered, while it is still visible. This is why a repipe is inspected before the drywall is patched and a sewer lateral is inspected before the trench is backfilled.

The inspection confirms the work meets the applicable plumbing code. If it passes, the permit is finalized and the work can be closed up. If the inspector identifies a deficiency, it must be corrected and re-inspected before the permit is finalized. This process is the protection the permit provides: an independent confirmation that the work is correct before it becomes invisible behind a wall or under the ground.

Why unpermitted work surfaces at the worst time

The reason permits matter to homeowners beyond code compliance is that unpermitted work has a way of surfacing at the most inconvenient possible moment. During a home sale, the buyer’s inspector may identify work that appears to be a repipe, a relocated water heater, or a modified gas line with no corresponding permit record. This raises questions, can delay or complicate the sale, and may require the seller to retroactively permit the work (which can involve opening up finished walls for inspection) or to negotiate a price reduction. Unpermitted work that does not meet code can become a genuine liability in a transaction.

During an insurance claim, the question of whether work was performed to code and permitted can arise, particularly if the work in question is related to the loss. Unpermitted work that contributed to a loss can complicate a claim.

And in the event of a plumbing failure or safety incident related to unpermitted work, the absence of permitting and inspection removes the documentation that the work was done correctly, which can have consequences ranging from the practical to the legal.

Why licensed contractors pull permits

Licensed plumbing contractors pull permits as a matter of standard practice for permitted work, because operating without required permits jeopardizes their license and exposes both the contractor and the homeowner to the problems described above. When a contractor proposes to do permitted work without a permit, often framed as a way to save the homeowner the permit fee and the inspection delay, that is a signal worth paying attention to. The permit fee is a small fraction of a repipe or water heater project cost, and the inspection is the homeowner’s protection. A contractor who routinely skips permits on permitted work is cutting a corner that the homeowner ultimately bears the risk of.

We pull the required City of Cerritos permits for all permitted work we perform and coordinate the inspection as part of the project. The permit and inspection are built into how we do the work, not an optional add-on.