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 |
| TESLA ENERGY OPERATIONS INC | Solar | Howard County | 64 | 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 |
| BRYAN DOUGLAS LAW | Solar | Howard County | 27 | Jun 2026 |
| TRINITY SOLAR LLC | Solar | Frederick County, Howard County | 23 | Jun 2026 |
| STANDARD ENERGY SOLUTIONS | Solar | Howard County | 18 | Jun 2026 |
| FREEDOM FOREVER MARYLAND LLC | Solar | Howard County | 8 | Jun 2026 |
| HERVE BILLIET | Solar | Howard County | 7 | Jul 2026 |
| SMART ROOF ENERGY DBA 4I ENERGY PARTNERS | Solar | Howard County | 6 | Jun 2026 |
| Nova Solar, Inc. | Solar | Frederick County, Howard County | 4 | Jul 2026 |
| PARADISE ENERGY SOLUTIONS LLC | Solar | Howard County | 4 | Jul 2026 |
| POWER FACTOR LLC | Solar | Howard County | 4 | May 2026 |
| RESIDENTIAL HOME RECOVERY CORP | Solar | Howard 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.