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 |
|---|---|---|---|---|
| TRI STAR ELECTRIC INC | Accessory Structure | Howard County | 24 | Jul 2026 |
| SILVER DOLLAR ELECTRIC INC. | Accessory Structure | Frederick County, Howard County | 20 | Jul 2026 |
| David Williams Electric | Accessory Structure | Howard County | 18 | Jul 2026 |
| O'REILLY ELECTRIC | Accessory Structure | Howard County | 16 | Jul 2026 |
| DAWN LAWSON | Accessory Structure | Frederick County | 15 | Jun 2026 |
| ANDREWS ARK ELECTRIC LLC | Accessory Structure | Howard County | 13 | Jul 2026 |
| ARTISAN INVESTMENTS LLC | Accessory Structure | Frederick County, Howard County | 9 | Jun 2026 |
| ELECTRICAL CONNECTIONS LLC | Accessory Structure | Frederick County, Howard County | 9 | Jul 2026 |
| Wenbrooke Services | Accessory Structure | Frederick County | 8 | Jul 2026 |
| WINN ELECTRIC CONTRACTING CO | Accessory Structure | Howard County | 8 | Jul 2026 |
| John Andrews | Accessory Structure | Frederick County | 7 | Jul 2026 |
| ABLE ELECTRICAL SERVICES INC | Accessory Structure | Howard County | 6 | Jul 2026 |
| JD ELECTRIC LLC | Accessory Structure | Howard County | 6 | Jun 2026 |
| Stella Electric LLC | Accessory Structure | Frederick County | 6 | Jul 2026 |
| C T Smith Electrical Services LLC | Accessory Structure | Frederick County, Howard County | 5 | Jun 2026 |
| Gabriel Boumel | Accessory Structure | Frederick County | 5 | Jul 2026 |
| II HOWARD C OREILLY | Accessory Structure | Frederick County | 5 | Jun 2026 |
| OLYMPUS ELECTRIC LLC | Accessory Structure | Frederick County, Howard County | 5 | Jul 2026 |
| THREE BROTHERS SERVICES LLC | Accessory Structure | Howard County | 5 | Jul 2026 |
| AMERICAN HOME CONTRACTORS | Accessory Structure | Howard County | 4 | Jun 2026 |
| BPM Heating & Cooling | Accessory Structure | Frederick County | 4 | Jul 2026 |
| CK ELECTRIC LLC | Accessory Structure | Howard County | 4 | Jul 2026 |
| ELECTRICAL SOLUTIONS, INC | Accessory Structure | Frederick County | 4 | May 2026 |
| Grossnickle Construction LLC | Accessory Structure | Frederick County | 4 | Jun 2026 |
| R. L. THOMPSON ELECTRIC CONTRACTORS INC | Accessory Structure | Howard County | 4 | Jul 2026 |
| SNYDER ELECTRIC INC | Accessory Structure | Frederick County, Howard County | 4 | Jun 2026 |
| TRIPLE C ELECTRIC | Accessory Structure | Howard County | 4 | Apr 2026 |
| Zachary Coburn | Accessory Structure | Frederick County | 4 | Jul 2026 |
| BRAVO ELECTRICAL SERVICES LLC. | Accessory Structure | Howard County | 3 | Jul 2026 |
| GUARDIAN PROTECTION SERVICES | Accessory Structure | Frederick County, Howard County | 3 | Jun 2026 |
| HAVEPOWER LLC | Accessory Structure | Frederick County, Howard County | 3 | Jun 2026 |
| HURD BUILDERS, LLC | Accessory Structure | Frederick County | 3 | Jun 2026 |
| JAMES M. SCANLON | Accessory Structure | Frederick County | 3 | Apr 2026 |
| Most Valuable Plumber | Accessory Structure | Frederick County | 3 | Jun 2026 |
| PHOENIX CONSTRUCTION SERVICES LLC | Accessory Structure | Howard County | 3 | Jul 2026 |
| THOMAS & THOMAS ELECTRIC LLC | Accessory Structure | Howard County | 3 | Jul 2026 |
Source: county permit records. Updated monthly.