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 |
|---|---|---|---|---|
| CARL STRINE PLUMBING & HEATING | Plumbing | 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 |
| EVGENY CHERNOUSOV | Plumbing | Howard County | 5 | Jul 2026 |
| EXCEL MECHANICAL | HVAC | Howard County | 5 | Jul 2026 |
| FRED ORAL ROBERTS THOMPSON | Electrical | Howard County | 5 | Jun 2026 |
| Gabriel Boumel | Accessory Structure | Frederick County | 5 | Jul 2026 |
| GLADHILL PLUMBING & HTG | Plumbing | Frederick County | 5 | Jul 2026 |
| HOMECRAFT BUILDERS INC | Deck & Patio | Howard County | 5 | Jun 2026 |
| Howard County Government | Deck & Patio | Howard County | 5 | Jun 2026 |
| II HOWARD C OREILLY | Accessory Structure | Frederick County | 5 | Jun 2026 |
| JOSE MENJIVAR LOPEZ | Electrical | Howard County | 5 | Jul 2026 |
| KAYWELL CONSTRUCTION CORPORATION | Plumbing | Frederick County | 5 | Jun 2026 |
| KELLIE VENEGAS | Deck & Patio | Frederick County | 5 | Jun 2026 |
| LONG FENCE COMPANY INCORPORATED | Deck & Patio | Howard County | 5 | Jun 2026 |
| LUIS CARO | Deck & Patio | Baltimore County | 5 | Apr 2026 |
| MAGOTHY ELECTRIC CO INC | Electrical | Howard County | 5 | Jul 2026 |
| M&A HEATING AND COOLING | HVAC | Howard County | 5 | Jun 2026 |
| MARYLAND HEATING & COOLING | HVAC | Howard County | 5 | Jul 2026 |
| MAYNE MECHANICAL LLC | Structural | Howard County | 5 | May 2026 |
| MID ATLANTIC COOPERATIVE SOLUTIONS DBA AERO ENERGY | Plumbing | Howard County | 5 | Jun 2026 |
| NATIVE SONS INC | Electrical | Howard County | 5 | Jul 2026 |
| OLYMPUS ELECTRIC LLC | Accessory Structure | Frederick County, Howard County | 5 | Jul 2026 |
| ONEIL PLUMBING | Plumbing | Howard County | 5 | Jun 2026 |
| Onspaugh Electric LLC | Electrical | Frederick County | 5 | May 2026 |
| PERFATER G MATTHEW | Pool & Spa | Howard County | 5 | Jun 2026 |
| Rachael Pietrzyk | Electrical | Frederick County | 5 | Jul 2026 |
| Robbie Norwood | Electrical | Frederick County | 5 | Jun 2026 |
| RYAN ELECTRIC | Electrical | Howard County | 5 | Jul 2026 |
| Sean Bartz | Deck & Patio | Frederick County | 5 | Jul 2026 |
| SHANNON-BAUM SIGNS INC | Sign | Howard County | 5 | Jun 2026 |
| ST JOHN PROPERTIES INC | HVAC | Howard County | 5 | Jul 2026 |
| STRATEGIC FACTORY | Sign | Frederick County, Howard County | 5 | Jun 2026 |
| TECHMARK CORPORATION | Electrical | Howard County | 5 | Jul 2026 |
| The Deck and Fence Company | Deck & Patio | Frederick County | 5 | Jul 2026 |
| THREE BROTHERS SERVICES LLC | Accessory Structure | Howard County | 5 | Jul 2026 |
| TIM KYLE CO., ELECTRCIAL CONTR | Electrical | Frederick County | 5 | Jun 2026 |
| VALLEY DECK & PATIO | Deck & Patio | Howard County | 5 | Jul 2026 |
| A AFFORDABLE ELECTRIC SERVICE LLC | Deck & Patio | Howard County | 4 | Jun 2026 |
| AC&T | Plumbing | Frederick County | 4 | Jul 2026 |
| AERO ENERGY | Site | Frederick County | 4 | Jul 2026 |
| ALTERNATIVE ROOFING INC | Howard County | 4 | Apr 2026 | |
| AMAZING PLUMBING HEATING AND AIR | Fire Protection | Howard County | 4 | Jun 2026 |
| AMERICAN HOME CONTRACTORS | Accessory Structure | Howard County | 4 | Jun 2026 |
| AMERICAN MASTERS PLUMBING CO LLC | Plumbing | Howard County | 4 | Jun 2026 |
| ARDO CONTRACTING INC | Deck & Patio | Howard County | 4 | Jul 2026 |
Source: county permit records. Updated monthly.