What's in a solar permit set?
A residential solar permit set is a small package of drawings and calculations that proves the system is safe, code-compliant and buildable. AHJs vary, but a complete set is remarkably consistent. Here's what's in one and what each sheet has to show.
1. Cover sheet
Project and customer info, the AHJ and utility, the enforced NEC/IBC edition, a system summary (DC/AC size, module and inverter counts), general notes and a sheet index.
2. Site / plot plan and roof plan
A plot plan — property lines, structures, setbacks, north arrow, street — and a roof plan showing the array layout to scale with fire-access pathways and setbacks (IFC 605), plus equipment locations.
3. Structural and attachment
The roof framing, added dead load, wind and snow criteria (ASCE 7), attachment spacing and fastener embedment, and a typical mounting detail. Many AHJs require a stamp when the structure is loaded near capacity.
4. Three-line / one-line diagram
The electrical heart of the set: every component (array, inverter, disconnects, combiner, meter, service), conductor types and sizes, OCPD ratings, grounding and bonding, and the point of interconnection. This is the sheet reviewers scrutinize most.
5. Label and placard schedule
The plaque/directory at the service, PV disconnect labels and rapid-shutdown marking (705.10 / 690.56) — listed explicitly so an inspector can verify them.
6. Load and interconnection calcs
A service load calculation (NEC 220.82/83/87 for dwellings) and the interconnection math — the 705.12 busbar 120% check or a supply-side tap — showing the system fits the service.
7. Manufacturer datasheets
The module datasheet, the inverter/microinverter datasheet and the racking installation and structural manual. In a real approved set these attachments are often the majority of the pages.
See the enforced requirements for your area in our permit guides by jurisdiction, and the underlying math on the NEC reference pages.
FAQ
What documents are required for a solar permit?
Typically a cover sheet, site/plot plan and roof plan, structural/attachment details, a three-line electrical diagram, a label schedule, a service load calc, the interconnection (705.12) calc, and manufacturer datasheets for the module, inverter and racking.
What is a one-line (three-line) diagram in a solar permit?
It is the electrical schematic of the PV system — array, inverter, disconnects, meter and service — with conductor sizes, OCPD ratings, grounding and the point of interconnection. It is the sheet plan reviewers examine most closely.
Do I need manufacturer datasheets in a solar permit set?
Usually yes. Most AHJs (and California) require listed equipment with the module, inverter and racking cut sheets or manual attached to the set.
Related: Permits & inspections
Educational reference, reviewed 2026-07. A design aid, not a substitute for a licensed electrician or PE. Confirm the enforced NEC edition and local amendments with your AHJ.
Draft this design in minutes — free
Describe a residential solar + storage system in plain English. OneLine Studio drafts the one-line diagram, sizes the conductors, runs these NEC checks live, and builds a permit-ready package.
Start free →