Permitting and interconnection in Loudoun County
| Permit issued (median) | 18 business days (2024) |
|---|---|
| Inspection scheduled (median) | 12.5 business days (2024) |
| Utility approval before install (median) | 2 business days (2024) |
| Final interconnection to PTO (median) | 7.5 business days (2024) |
| Median residential permit cost | $200 |
| Online submission | Online portal or email |
| Instant permitting | Not available |
| Same-day, over-the-counter permits | Not available |
| Structural review, systems under 10 kW | Required |
| Electrical review, systems under 10 kW | Not required |
| Inspections required | 2 |
| Rough-in inspection | Required |
| SolSmart designation | Silver |
A Loudoun County plan set from Ballast
Enter the address and Ballast finds the jurisdiction and the utility, pulls the aerial and parcel line, and builds the set on ANSI B: cover, site plan, roof or array plan, attachment details, line diagrams, NEC calculations, labels and spec sheets.
- Checks run under the code edition Loudoun County has adopted, each with the article cited.
- Any correction Loudoun County sends back becomes a rule for the jurisdiction, so the next set already answers it.
- The Solar Agent follows the permit through to approval, then moves the job on to interconnection and install.
Questions
How long does a solar permit take in Loudoun County, VA?
The median time to issue a residential solar permit in Loudoun County was 18 business days in 2024, according to NREL SolarTRACE.
How much does a solar permit cost in Loudoun County?
The median residential solar permit cost in Loudoun County is $200 (NREL SolarTRACE). Confirm the current fee schedule with the jurisdiction.
How many inspections does a solar install need in Loudoun County?
Loudoun County requires 2 inspections for a residential solar installation, including a rough-in inspection.
Source: SolarTRACE, National Renewable Energy Laboratory (NREL), 2025-09-09 release. Times are medians for residential solar in the year shown. Requirements change — confirm current rules, fees and forms with the jurisdiction before you submit.