Los Angeles is one of the highest-volume residential solar markets in the US — LADBS processes thousands of solar permits annually. The market is divided between the City of Los Angeles (LADWP utility, LADBS permits) and the broader LA County area (SCE utility, LA County Building permits). Getting the jurisdiction right before submitting any application is the first step.
City vs. County Jurisdiction
The City of Los Angeles (LADBS + LADWP) is surrounded by dozens of other cities and unincorporated LA County. Addresses in Beverly Hills, Santa Monica, Burbank, Glendale, Pasadena, Long Beach, or unincorporated county areas are NOT City of Los Angeles — they have separate permitting authorities and utilities. Use the LA County parcel viewer to verify the correct permitting authority before submitting.
SurgePV’s solar design platform helps automate compliance documentation.
NEC 2020 with California Amendments
Los Angeles uses the California Electrical Code, which is NEC 2020 with California-specific amendments:
| Requirement | California Addition |
|---|---|
| Rapid shutdown | NEC 690.12 + CALFire setback requirements |
| New construction | Title 24 mandatory solar (NEC 2020 base) |
| Fire hazard zones | Additional clearance requirements per CalFire |
| AFCI | NEC 2020 scope |
CalFire Setback Requirements (SB 1222)
For rooftop solar on residential structures:
- 3-foot access pathway required on at least two sides of each array
- Pathways must be clear of panels and obstructions
- Fire department access ridge path on roofs over 2:12 pitch
- Additional requirements in High Fire Hazard Severity Zones
LA County Fire Department has supplementary requirements for installations in designated fire hazard severity zones (significant portions of the Santa Monica Mountains, San Gabriel Mountains foothills, and other hillside areas).
LADBS Permit Process
SolarAPP+ Track (Residential, under 15 kW)
- Design system using SolarAPP+-compatible software
- Submit to SolarAPP+ portal — automated plan review
- Receive approval certificate (typically same-day)
- Submit approval certificate + LADBS online application
- LADBS issues over-the-counter permit
- Complete installation
- Schedule LADBS inspection
Standard Track (All Other Systems)
- Submit permit application through LADBS eServices portal
- Submit electrical one-line diagram, structural calculations, site plan
- Plan check review: 10–20 business days (complex systems longer)
- Receive approval and permit
- Complete installation
- Schedule inspections
LADBS permits required:
- Building permit (structural)
- Electrical permit
- Combination permit available for some residential systems
Permit Fees (Approximate)
| System Size | Approximate Permit Fee |
|---|---|
| Under 5 kW residential | $150–300 |
| 5–10 kW residential | $200–500 |
| 10–50 kW commercial | $500–1,500 |
| Over 50 kW | Based on valuation |
LADWP Interconnection
LADWP (Los Angeles Department of Water and Power) is a municipal utility that does not follow California PUC or NEM 3.0 rules — LADWP has its own rate structure:
LADWP Net Billing Tariff (NBT)
- LADWP uses a Net Billing Tariff (similar in concept to NEM 3.0 but LADWP-specific)
- Export credits are at a rate set by LADWP’s Rate Schedule — not the full retail rate
- Monthly true-up (not annual like PG&E/SCE NEM 3.0)
- Battery storage integration available under LADWP’s time-of-use rates
LADWP Interconnection Process
| Step | Action | Timeline |
|---|---|---|
| 1 | Apply for LADWP solar program online | Day 1 |
| 2 | LADWP technical review | 10–15 business days |
| 3 | Execute interconnection agreement | After review |
| 4 | Complete installation + LADBS inspection | Per schedule |
| 5 | LADWP activates net billing | 5–10 business days after inspection |
LADWP vs. SCE: Different Net Metering Programs
For areas in LA County served by Southern California Edison (SCE), the applicable net metering program is NEM 3.0 (Avoided Cost Calculator rates for exports). This is different from LADWP’s NBT. The utility determines the net metering economics — not the city. Projects in SCE territory use SCE’s NEM 3.0 process regardless of what city they are in.
Los Angeles Climate — Engineering Considerations
Los Angeles conductor derating:
| Parameter | Value |
|---|---|
| ASHRAE max air temp | 38°C |
| + 22°C rooftop adder | +22°C |
| Effective conductor temp | 60°C |
| THWN-2 (90°C) correction factor | 0.71 |
NEC 690.7 string voltage (LA):
For T_min = 3°C (ASHRAE LA minimum), β_Voc = -0.28%/°C, Voc = 45.0V:
Factor = 1 + (3 - 25) × (-0.0028) = 1.0616
Max modules (600V) = 600 / (45.0 × 1.0616) = 12.56 → 12 modulesAutomate LA Solar Permitting — LADBS Ready
SurgePV generates LADBS and SolarAPP+-compatible permit packages for Los Angeles — NEC 2020 + California amendments, CalFire setback documentation, and LADWP interconnection requirements.
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Frequently Asked Questions
Does Los Angeles use SolarAPP+?
Yes — the City of Los Angeles (LADBS) participates in SolarAPP+ for residential systems under 15 kW. SolarAPP+ provides same-day approval for qualifying systems. Unincorporated LA County uses a separate process through LA County Building and Safety.
How does LADWP net metering work?
LADWP uses its own Net Billing Tariff (NBT) — not California PUC NEM 3.0. LADWP export credits are calculated at LADWP’s NBT rate on a monthly basis. This differs from SCE or PG&E customers who use NEM 3.0 with Avoided Cost Calculator export rates.
What are the CalFire setback requirements in LA?
SB 1222 requires 3-foot access pathways on at least two sides of each array on residential rooftops. In LA’s High Fire Hazard Severity Zones, additional LA County Fire Department requirements apply. Verify with LADBS and LACFD for projects in hillside or fire-prone areas.
