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 |
|---|---|---|---|---|
| Rick Jones Electric | Electrical | Frederick County | 6 | Jul 2026 |
| Stella Electric LLC | Accessory Structure | Frederick County | 6 | Jul 2026 |
| AA ROOTER LLC DBA ROOTERMAN | Plumbing | Frederick County, Howard County | 5 | Jul 2026 |
| Alpha Electric LLC | Electrical | Frederick County | 5 | Jul 2026 |
| ANTHONY W PETROLLE | HVAC | Frederick County | 5 | Jul 2026 |
| ARCO ELECTRIC INC | Electrical | Frederick County, Howard County | 5 | Jun 2026 |
| C.E.Rensberger & Family Builder LLC | Plumbing | Frederick County | 5 | Apr 2026 |
| C T Smith Electrical Services LLC | Accessory Structure | Frederick County, Howard County | 5 | Jun 2026 |
| DAVID L KLIPP | Plumbing | Frederick County | 5 | Jun 2026 |
| DIXIE ELECTRIC,INC | Electrical | Frederick County, Howard County | 5 | Jul 2026 |
| Dorcus Construction Company Inc. | Plumbing | Frederick County | 5 | Jul 2026 |
| DUN-RITE PLUMBING & HEATING | Deck & Patio | Frederick County, Howard County | 5 | Jun 2026 |
| Gabriel Boumel | Accessory Structure | Frederick County | 5 | Jul 2026 |
| GLADHILL PLUMBING & HTG | Plumbing | Frederick County | 5 | Jul 2026 |
| II HOWARD C OREILLY | Accessory Structure | Frederick County | 5 | Jun 2026 |
| KAYWELL CONSTRUCTION CORPORATION | Plumbing | Frederick County | 5 | Jun 2026 |
| KELLIE VENEGAS | Deck & Patio | Frederick County | 5 | Jun 2026 |
| OLYMPUS ELECTRIC LLC | Accessory Structure | Frederick County, Howard County | 5 | Jul 2026 |
| Onspaugh Electric LLC | Electrical | Frederick County | 5 | May 2026 |
| Rachael Pietrzyk | Electrical | Frederick County | 5 | Jul 2026 |
| Robbie Norwood | Electrical | Frederick County | 5 | Jun 2026 |
| Sean Bartz | Deck & Patio | Frederick County | 5 | Jul 2026 |
| STRATEGIC FACTORY | Sign | Frederick County, Howard County | 5 | Jun 2026 |
| The Deck and Fence Company | Deck & Patio | Frederick County | 5 | Jul 2026 |
| TIM KYLE CO., ELECTRCIAL CONTR | Electrical | Frederick County | 5 | Jun 2026 |
| AC&T | Plumbing | Frederick County | 4 | Jul 2026 |
| AERO ENERGY | Site | Frederick County | 4 | Jul 2026 |
| Barnabas domowski | Deck & Patio | Baltimore County, Frederick County | 4 | Jul 2026 |
| BPM Heating & Cooling | Accessory Structure | Frederick County | 4 | Jul 2026 |
| BRIAN P SHANHOLTZ | Electrical | Frederick County | 4 | Jun 2026 |
| BUILD HD LLC | Deck & Patio | Frederick County, Howard County | 4 | Jun 2026 |
| CHARLES A HORN | Electrical | Frederick County | 4 | Jul 2026 |
| Charm City Electric | Electrical | Frederick County | 4 | Jul 2026 |
| Contracting LLC Stephen Lewis Barrett | Plumbing | Frederick County | 4 | Jul 2026 |
| DONALD L GOWER II | Electrical | Frederick County | 4 | May 2026 |
| ELECTRICAL SOLUTIONS, INC | Accessory Structure | Frederick County | 4 | May 2026 |
| FA OUTDOOR SPACES LLC | Deck & Patio | Frederick County, Howard County | 4 | Jul 2026 |
| FREDERICK PLUMBING & HEATING | Plumbing | Frederick County | 4 | May 2026 |
| Grossnickle Construction LLC | Accessory Structure | Frederick County | 4 | Jun 2026 |
| Hatfield's Equipment | Plumbing | Frederick County | 4 | May 2026 |
| Ivan Reid | Plumbing | Frederick County | 4 | Jul 2026 |
| JAMES E MORGAN | Plumbing | Frederick County | 4 | Jul 2026 |
| JR ROBERT L HALLEY | Plumbing | Frederick County | 4 | Jul 2026 |
| KENNETH A EYLER | Electrical | Frederick County | 4 | Jul 2026 |
| KINSLEY CONSTRUCTION LLC | Plumbing | Frederick County, Howard County | 4 | Jun 2026 |
| Kitchen & Bath Shop | Structural | Frederick County | 4 | Jun 2026 |
| Kline's Plumbing, LLC | Plumbing | Frederick County | 4 | Jun 2026 |
| Mallick Mechanical Contractors | Plumbing | Frederick County, Howard County | 4 | Jun 2026 |
| MOXLEY PLUMBING | Plumbing | Frederick County | 4 | Jun 2026 |
| Nate Wagner | Pool & Spa | Frederick County | 4 | Jun 2026 |
Source: county permit records. Updated monthly.