Quick Facts
| Item | Detail |
|---|---|
| Authority Having Jurisdiction | LA County Dept. of Public Works — Building & Safety |
| Phone | (626) 458-3173 |
| Permit Fee (estimate) | $300–$800 |
| Typical Approval Timeline | 10–15 business days (online); walk-through for under 10kW |
| Required Inspections | Structural rough, electrical rough, final |
| Primary Utility | SCE (most areas) or LADWP (portions) |
| PTO Timeline (post-final) | 20–40 business days |
County-Specific Requirement
LA County offers over-the-counter solar permits for residential systems under 10kW meeting standard installation criteria — bring the complete permit package to a Building & Safety district office. NEM 3.0 (Net Billing Tariff) applies to SCE customers. LADWP customers follow a separate interconnection process at ladwp.com with a $50 Customer-Owned Generation application fee.
Required Documents
- Completed permit application — from LA County Dept. of Public Works — Building & Safety
- Site plan / plot plan — showing panel location, setbacks, north arrow, scale
- Roof plan with panel layout — including IFC fire setback dimensions
- Single-line electrical diagram (SLD) — signed by installer
- Equipment specification sheets — panels, inverter, racking
- Structural engineering letter — required for systems over 10kW in most jurisdictions
- Permit fee — $300–$800 (verify current fee schedule with AHJ)
Interconnection: SCE (most areas) or LADWP (portions)
SCE NEM 3.0: export credits are calculated at avoided cost (3–5¢/kWh), not full retail. Battery storage combined with solar is now strongly favored in LA County to maximize self-consumption. Submit the SCE interconnection application at sce.com simultaneously with the county permit.
Full step-by-step guide: Solar Interconnection Application Steps.
File your SCE (most areas) or LADWP (portions) interconnection application at the same time as your county permit application. Both reviews run in parallel, saving 3–6 weeks off your total timeline to Permission to Operate.
HOA Solar Rights — California
For California HOA solar rights and a template approval request letter, see our HOA Solar Rights by State guide.
Frequently Asked Questions
Contact LA County Dept. of Public Works — Building & Safety at (626) 458-3173 or use their online portal to schedule inspections. Your installer typically schedules inspections on your behalf. Inspections are generally available within 1–5 business days of scheduling, depending on the AHJ's workload. Confirm the inspection type (rough-in vs. final) and access requirements with your installer before the scheduled date.
The most common causes: incomplete application documents (missing SLD or spec sheets), plan revisions required by the AHJ (often fire setback issues), and utility interconnection queue delays. Submitting a complete, accurate package the first time and filing the SCE (most areas) or LADWP (portions) interconnection application simultaneously with the county permit are the two most effective delay-reduction strategies.
A properly permitted and inspected solar installation is generally covered under your homeowner's policy as a permanent home improvement. Notify your insurer after installation is complete and PTO is issued — some require a rider or endorsement for solar. Unpermitted installations may void coverage for fire or weather damage. See our guide: What Happens If You Install Solar Without a Permit.