Contractors active in Maryland county permit records, grouped from public filings. Counts reflect permits attributed to each firm. Not every filing names a contractor, so counts here are a floor. A firm's actual permit activity is usually higher.
| Contractor | Trade | Counties | Permits | Last active |
|---|---|---|---|---|
| SUNRUN INSTALLATION SERVICES INC | Solar | Frederick County, Howard County | 267 | Jul 2026 |
| SOLAR ENERGY WORLD | Solar | Frederick County, Howard County | 109 | Jul 2026 |
| FUSION SOLAR SERVICES LLC | Solar | Frederick County, Howard County | 106 | Jul 2026 |
| CELESTIAL SOLAR INNOVATIONS LLC | Solar | Frederick County, Howard County | 44 | Jul 2026 |
| D & L CLEAN POWER SOLUTIONS LLC | Solar | Frederick County, Howard County | 33 | Jun 2026 |
| Tesla Energy Operations, Inc. Tesla Energy Operations, Inc. | Solar | Frederick County | 23 | Jul 2026 |
| TRINITY SOLAR LLC | Solar | Frederick County, Howard County | 23 | Jun 2026 |
| Top tier solar solutions LLC | Solar | Frederick County | 7 | May 2026 |
| Nova Solar, Inc. | Solar | Frederick County, Howard County | 4 | Jul 2026 |
| Roofsimple INC dba Solarsimple | Solar | Frederick County | 4 | Apr 2026 |
| Brandon K Shores | Solar | Frederick County | 3 | Jun 2026 |
| Solar Installers Near Me LLC | Solar | Frederick County | 3 | Jun 2026 |
| SUSTAINABLE ENERGY SYSTEMS | Solar | Frederick County, Howard County | 3 | Jun 2026 |
| Venture Home Solar, LLC | Solar | Frederick County, Howard County | 3 | Jun 2026 |
Source: county permit records. Updated monthly.