Do You Need a Permit to Pour Concrete in Los Angeles?

Short answer: some concrete needs a permit in Los Angeles and some does not, and the line is not about size - it is about whether the work is structural, whether it is in the public right-of-way, or whether it holds back soil. Replacing a backyard patio slab on the same footprint usually does not need a building permit. A new foundation, a structural slab, a driveway apron at the street, or a retaining wall over four feet almost always does. Here is how the lines actually fall.

Work that generally needs a permit

• New foundations and structural slabs. Anything that supports a structure - a house foundation, an ADU or addition slab, footings - is engineered, permitted, and inspected work through LA Department of Building and Safety. This is the category where the permit is not paperwork; the pre-pour steel inspection is what guarantees the reinforcement is actually there.
• Driveway aprons in the public right-of-way. The apron where your driveway meets the street is City property, and cutting a new curb or pouring a new apron needs a permit from the LA Bureau of Engineering. This one surprises homeowners constantly, and it is a real line item in our LA driveway cost guide.
• Retaining walls over four feet. A wall retaining more than four feet of soil, measured from the bottom of the footing, needs an engineered design and a building permit. Even shorter walls need proper drainage, and a wall supporting a surcharge (like a driveway above it) can trip the requirement at a lower height.
• Work in a hillside or special hazard area. On hillside lots and in methane, flood, or fault zones, the thresholds are stricter and more work is pulled into permitting.

Work that usually does not

Straight replacement of a non-structural flatwork slab - a patio, a walkway, a small pad - on the same footprint and grade is generally maintenance and does not need a building permit. But two caveats: the surrounding cities (Santa Monica, Pasadena, Long Beach, Glendale, Burbank, and Torrance each run their own building departments) set their own thresholds, so the answer in the City of LA is not automatically the answer in Pasadena; and a public sidewalk repair out front, while your responsibility as the fronting owner, has its own City spec to meet.

Who is responsible for repairing the sidewalk in front of your house?

In California, under state law the owner of the fronting property is responsible for maintaining the sidewalk adjacent to their lot, and that is the default answer in Los Angeles too - the concrete is in the public right-of-way, but the upkeep lands on you. The important LA wrinkle is the City's Sidewalk Repair Program, which offers help where the damage came from a City street tree and runs a rebate track for owners who repair their own frontage; the current terms, eligibility, and application live with the LA Bureau of Engineering, and they are worth checking before you pay for the work outright, because the program has changed more than once.

Either way the repair itself is not free-form flatwork. Sidewalk in the right-of-way has to be built to City spec - width, thickness, cross-slope, scoring, and ADA-compliant transitions at driveways and corners - and it needs an A-permit from the Bureau of Engineering, not a building permit from LADBS. That is a different counter than the one you use for a patio, which is exactly why homeowners get sent in circles on this one. A contractor who does right-of-way work regularly will know which desk it goes to and will build to the inspection.

Why unpermitted concrete costs more, not less

The fee you skip is small. The cost of skipping it is not. Unpermitted structural concrete is an unpermitted structure, and it surfaces at the worst possible moment - when you sell and it shows up in inspection, when you refinance, or when you file an insurance claim on a wall or foundation that failed. At that point the city can require you to expose finished work for inspection or tear it out and re-do it to code. A permitted pour, inspected at the right stages, is documented and clean, and it is the version a buyer's agent and an insurer both want to see.

Who pulls the permit?

A licensed concrete contractor pulls the permits for the work they do and builds to the inspections - that is part of what separates a licensed crew from a cash pour. When we quote a foundation, apron, or retaining wall, the permit is in the bid and the inspection milestones are in the schedule.

Common questions

Do I need a permit to replace my backyard patio slab? In the City of LA, straight replacement of a non-structural patio on the same footprint and grade is generally maintenance and does not need a building permit. Change the footprint, add a roof or a structure over it, or work on a hillside lot, and the answer flips - and Pasadena, Santa Monica, Long Beach, Glendale, Burbank, and Torrance each set their own thresholds.

How long does a concrete permit take in Los Angeles? Honestly, it depends entirely on the type. Over-the-counter permits for straightforward flatwork and aprons can move quickly; anything engineered - a foundation, an ADU slab, a tall retaining wall - goes through plan check and should be planned for in weeks, not days. Build the permit timeline into the project schedule rather than treating it as a formality at the end.

What happens if the previous owner poured concrete without a permit? It becomes your problem when you sell, refinance, or file a claim. The usual path is a retroactive permit, which can mean exposing finished work so an inspector can verify what is underneath. Getting it assessed early is far cheaper than discovering it in escrow.

Not sure whether your project needs a permit? Our Los Angeles concrete team will tell you straight during the site visit and handle the permitting for the work that needs it.