Module 10 · Lesson 6
Other Departments: Fire, Public Works, and Utilities
Beyond Planning and Building, your ADU may be reviewed by Fire, Public Works, and utility providers. What each one checks and when they matter.
Planning and Building are the main event, but your application may make brief stops at other desks. Most are routine; each has one question it cares about. Knowing them prevents the "who is asking for THIS now?" moment.
Fire. Question: can we reach it and will it resist ignition? Fire review matters most in Very High Fire Hazard Severity Zones (Module 2.5) — expect comments on ignition-resistant construction, vents, and defensible space. Elsewhere, the common items are access-path width to a rear unit, hydrant distance, and whether sprinklers apply (recall the friendly rule: generally only if the main house has them). Most flat-land ADUs pass through Fire with little or no comment.
Public Works / Engineering. Question: what does this project do to the public's infrastructure? They review driveway approaches and curb cuts, drainage (your roof's new water has to go somewhere that isn't the neighbor's yard), grading on sloped lots, sewer connections in the public right-of-way, and any work touching the sidewalk or street. Trench across a sidewalk for utilities and it's Public Works issuing that encroachment permit.
Utility providers. Question: can we serve it? Not a city department at all — LADWP, SCE, PG&E, and your water/sewer district run their own parallel processes for panel upgrades, new meters, and service connections (Module 7's timelines). The classic mistake is treating utility applications as an afterthought: their clocks don't care about your permit date. Start them during plan check, not after.
Occasionally: school district fees (collected at issuance for larger units), sanitation districts with their own sewer fees, and — for the special zones from Module 2.5 — coastal or historic reviews.
The practical takeaway: none of these desks is scary; the risk is purely sequencing. A well-run project identifies every required sign-off on day one and runs them in parallel. A poorly run one discovers Fire's access comment in month four. The difference is a checklist — and a team that has been through your city before.
Key takeaways
- Fire cares about access and ignition resistance; Public Works about drainage, driveways, and the right-of-way; utilities about serving the load.
- Utility providers run their own clocks — apply during plan check, never after permit.
- Special zones (fire, coastal, historic) add their reviews to the routing.
- The risk is sequencing, not difficulty: identify every sign-off on day one and run them in parallel.