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 |
|---|---|---|---|---|
| STANDARD ENERGY SOLUTIONS | Solar | Howard County | 18 | Jun 2026 |
| B & B AIR CONDITIONING & HEATING | HVAC | Howard County | 17 | Jul 2026 |
| ROYAL ELECTRIC INC | Electrical | Frederick County, Howard County | 17 | Jul 2026 |
| ALL AROUND PLUMBING INC | Plumbing | Frederick County | 16 | Jul 2026 |
| CHASE PLUMBING & WELL SERVICES | Plumbing | Howard County | 16 | Jul 2026 |
| EDGE ENERGY DBA EQUITY DEVELOPMENT | Electrical | Howard County | 16 | Jul 2026 |
| F.H. FURR PLUMBING, HEATING, AIR CONDITIONING, & ELECTRICAL | HVAC | Howard County | 16 | Jul 2026 |
| JES CONSTRUCTION INC | Structural | Frederick County, Howard County | 16 | Jul 2026 |
| KCL ELECTRIC | Electrical | Frederick County, Howard County | 16 | Jul 2026 |
| O'REILLY ELECTRIC | Accessory Structure | Howard County | 16 | Jul 2026 |
| BARRY DETWILER | Fire Protection | Frederick County | 15 | Jun 2026 |
| CLARKSVILLE ELECTRIC LLC | Electrical | Howard County | 15 | Jul 2026 |
| DAWN LAWSON | Accessory Structure | Frederick County | 15 | Jun 2026 |
| LARRY & SONS INC | HVAC | Frederick County | 15 | Jul 2026 |
| MARYLAND ELECTRICAL SOLUTIONS | HVAC | Howard County | 15 | Jul 2026 |
| Tuckers Air Conditioning, Heating and Plumbing | HVAC | Frederick County | 15 | Jul 2026 |
| EDGE ENERGY | HVAC | Howard County | 14 | Jul 2026 |
| F.H. FURR PLMB, HTG, & A/C | HVAC | Frederick County | 14 | Jul 2026 |
| HUNT PLUMBING HEATING AND AIR CONDITIONING, LLC | HVAC | Howard County | 14 | Jul 2026 |
| Nathan Burner | Plumbing | Frederick County | 14 | Jul 2026 |
| ROTO ROOTER SERVICES COMPANY | Plumbing | Howard County | 14 | Jul 2026 |
| SCOTT MERCER LLC | Pool & Spa | Frederick County | 14 | Jul 2026 |
| TIM KYLE CO ELECTRICAL SERVICE INC | Electrical | Howard County | 14 | Jul 2026 |
| TNT PLUMBING & DRAIN SERVICE, LLC | Plumbing | Frederick County, Howard County | 14 | Jul 2026 |
| ANDREWS ARK ELECTRIC LLC | Accessory Structure | Howard County | 13 | Jul 2026 |
| ASC HEATING AND AIRCONDITIONING INC | Structural | Howard County | 13 | Jun 2026 |
| WESLEY BARR | HVAC | Frederick County | 13 | Jul 2026 |
| ANCHOR MECHANICAL LLC | Structural | Howard County | 12 | Jun 2026 |
| BRICK STREET CONSTRUCTION, LLC | HVAC | Frederick County | 12 | Jun 2026 |
| J&R Plumbing & Heating | Pool & Spa | Frederick County, Howard County | 12 | Jul 2026 |
| LONG ELECTRIC LLC | Electrical | Frederick County, Howard County | 12 | Jun 2026 |
| PRECISION ELECTRICAL SOLUTIONS | Electrical | Frederick County | 12 | Jul 2026 |
| SPRINKLERS,LLC FIRE TECH RESID | Fire Protection | Frederick County | 12 | Jul 2026 |
| WHITE SPARK ELECTRIC | Electrical | Frederick County, Howard County | 12 | Jul 2026 |
| CAPITAL CITY PLUMBING | Plumbing | Howard County | 11 | Jul 2026 |
| LEN THE PLUMBER HEATING & AIR | HVAC | Howard County | 11 | Jun 2026 |
| PARAMOUNT ELECTRIC CO., INC. | Pool & Spa | Frederick County, Howard County | 11 | Jul 2026 |
| PJ Fitzpatrick LLC | Plumbing | Frederick County | 11 | Jul 2026 |
| RENOVATION EXPERTS INC | Plumbing | Frederick County | 11 | Jun 2026 |
| Barrick & Sons Lawn Service LLC | Deck & Patio | Frederick County | 10 | Jun 2026 |
| BOYLAND ELECTRIC INC | Electrical | Frederick County, Howard County | 10 | Jul 2026 |
| BRUCE BOYD | Plumbing | Frederick County | 10 | Jul 2026 |
| MARYLAND MECHANICAL SYSTEMS INC. | Structural | Howard County | 10 | Jul 2026 |
| MILES ELECTRIC CO INC | Electrical | Frederick County, Howard County | 10 | Jul 2026 |
| P J FITZPATRICK LLC | Plumbing | Howard County | 10 | Jul 2026 |
| REEDY ELECTRICAL SERVICES INC | Electrical | Howard County | 10 | Jul 2026 |
| RON AIR INC | HVAC | Howard County | 10 | Jul 2026 |
| Sight & Sound Systems, Inc. | Electrical | Frederick County | 10 | Jun 2026 |
| TEVIS OIL, INC. | Site | Howard County | 10 | Jul 2026 |
| WALTS MECHANICAL SERVICES INC | HVAC | Howard County | 10 | Jun 2026 |
Source: county permit records. Updated monthly.