Cerritos ADU Builder

Building an ADU in Cerritos, CA

A famously well-kept city with an orderly permit process — build the ADU to Cerritos standards and the process rewards you.

Get your free quote→ (949) 374-7980

Cerritos ADU key facts

Who reviews your plans	Cerritos’ own Community Development department — planning approval plus building plan check at the city’s counter
The city’s style	Cerritos publishes its residential permit process step-by-step, down to the allowed construction hours
Housing stock	Well-maintained 1960s-70s tract homes on regular lots — newer bones than the postwar cities
State-law floor	Ministerial approval, 4-ft setbacks, and the 2026 SB 543 review clock all apply

Cerritos runs one of the most orderly counters on the LA side of our service area. The city publishes its residential permit path step by step — planning approval, plan check, inspections, even the allowed construction hours — and it expects projects to respect that order. That suits us: our submittals go in complete, our crews work to posted hours, and a code-compliant ADU moves through on the state’s ministerial timeline.

What’s different about building in Cerritos

Cerritos takes visible pride in how the city looks — neighborhoods here are kept, and the permit process reflects the same discipline. Practically, that means the design should defer to the neighborhood: rooflines, materials and colors that belong on the street. State law guarantees your right to build; designing to Cerritos’ standards is what makes the build smooth.

The housing stock helps. Much of Cerritos went up in the 1960s and 70s — a decade or two younger than the postwar cities — so slabs and electrical panels tend to check out better on garage conversions, and lots are regular enough that detached units place cleanly. The physical checkpoints are the familiar three: slab, panel, sewer run.

One practical note from the city’s own process page: plan-check and planning services run on posted counter schedules, so a submittal that arrives complete matters even more here — a bounced package waits for the next window. We build the completeness check into our process so the state review clock starts on the first pass.

What an ADU costs in Cerritos

The short answer

The published ranges apply in Cerritos: garage conversions typically $90,000–$150,000, new detached units $200,000–$450,000+. What moves the number is physical — slab, panel, sewer — not the city. Get a range for your size in the ADU cost calculator.

Frequently asked questions

Does Cerritos use LADBS?

No — Cerritos has its own Community Development department. Your ADU goes through the city’s own planning approval and plan check, on the state’s legal review timeline.

Are Cerritos’ standards stricter for ADUs?

State law sets the approval floor everywhere — what stands out in Cerritos is order: a step-by-step published process and posted construction hours. A complete, neighborhood-appropriate design moves smoothly; a sloppy submittal waits.

Can I convert my garage in Cerritos?

Usually, yes — and the 1960s-70s housing stock means slabs and panels pass inspection more often than in older cities. We verify slab, panel capacity and the sewer route on the first visit.

Does a Cerritos ADU need a public hearing?

No. A code-compliant ADU is approved ministerially under state law — no hearing — and since 2026 the review runs on a legal clock: 15 days to completeness, 60 days to decide.

Useful links for Cerritos homeowners

City of Cerritos — residential permit & planning approval Orange County ADU cost guide OC permit requirements Garage conversion ADU guide All areas we serve

Ready to start
your ADU?

Get a free, no-pressure quote from a licensed Orange County design-build team — and a plan drawn around your lot.