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 |
|---|---|---|---|---|
| ASC HEATING AND AIRCONDITIONING INC | Structural | Howard County | 13 | Jun 2026 |
| ANCHOR MECHANICAL LLC | Structural | Howard 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 |
| 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 |
| BOYLAND ELECTRIC INC | Electrical | Frederick County, Howard 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 |
| TEVIS OIL, INC. | Site | Howard County | 10 | Jul 2026 |
| WALTS MECHANICAL SERVICES INC | HVAC | Howard County | 10 | Jun 2026 |
| ARTISAN INVESTMENTS LLC | Accessory Structure | Frederick County, Howard County | 9 | Jun 2026 |
| ARUNDEL COOLING & HEATING CO INC | HVAC | Howard County | 9 | Jul 2026 |
| BLACKSTONE PLUMBING AND ELECTRIC | Plumbing | Howard County | 9 | Jul 2026 |
| CORNERSTONE REMODELING LLC | Interior | Howard County | 9 | Jul 2026 |
| ELECTRICAL CONNECTIONS LLC | Accessory Structure | Frederick County, Howard County | 9 | Jul 2026 |
| FIDELITY ENGINEERING, LLC | Structural | Howard County | 9 | Jul 2026 |
| MDP DECK AND PATIOS LLC | Deck & Patio | Howard County | 9 | Jun 2026 |
| Montgomery Decks | Deck & Patio | Frederick County, Howard County | 9 | Jul 2026 |
| RENOVATIONS EXPERT INC | Electrical | Howard County | 9 | Jul 2026 |
| Ash Electric LLC | Electrical | Frederick County, Howard County | 8 | Jul 2026 |
| BLUE JAY ELECTRIC CO | Electrical | Howard County | 8 | Jul 2026 |
| BUILD AND DESIGN CONTRUCTION INC. | Plumbing | Howard County | 8 | Jul 2026 |
| CASTAWAY PLUMBING | Plumbing | Frederick County, Howard County | 8 | Jun 2026 |
| CHESAPEAKE ENERGY SOLUTIONS LLC | Electrical | Howard County | 8 | Jul 2026 |
| CLARKSVILLE PLUMBING LLC | Plumbing | Howard County | 8 | Jul 2026 |
| FREEDOM FOREVER MARYLAND LLC | Solar | Howard County | 8 | Jun 2026 |
| MACE ENTERPRISES LLC | Fire Protection | Howard County | 8 | Jun 2026 |
| PLUMB CHEAP INC | Plumbing | Howard County | 8 | Jul 2026 |
| PRIME PLUMBING | Plumbing | Howard County | 8 | Jul 2026 |
| Shipp Electric | Electrical | Howard County | 8 | Jun 2026 |
| VIBRANIUM ELECTRICAL SERVICES LLC | Electrical | Howard County | 8 | Jul 2026 |
| WINN ELECTRIC CONTRACTING CO | Accessory Structure | Howard County | 8 | Jul 2026 |
| B AND B AIR CONDITIONING AND HEATING | HVAC | Howard County | 7 | Jun 2026 |
| CECCIO ELECTRIC LLC | Electrical | Howard County | 7 | Jul 2026 |
| CLINTON ELECTRIC CO INC | Electrical | Howard County | 7 | Jul 2026 |
| CUSTOM WORKS INC | Deck & Patio | Howard County | 7 | Jul 2026 |
| DAN PRI CONSTRUCTION INC | Deck & Patio | Frederick County, Howard County | 7 | Jun 2026 |
| DAVCON ELECTRICAL SERVICES, LLC | Electrical | Frederick County, Howard County | 7 | Jul 2026 |
| ELITE DECKS & PATIOS OF MD LLC | Deck & Patio | Frederick County, Howard County | 7 | Jul 2026 |
| F.H. FURR PLUMBING, HEATING, AIR CONDITIONING, AND | HVAC | Howard County | 7 | Jul 2026 |
| Fortress Foundation Solutions | Structural | Frederick County, Howard County | 7 | Jul 2026 |
| GARTLAND PLUMBING INC | Plumbing | Howard County | 7 | Jun 2026 |
| GREEN ELECTRIC SOLUTIONS LLC | HVAC | Howard County | 7 | Jul 2026 |
| HATZEL & BUEHLER | Electrical | Howard County | 7 | Jul 2026 |
Source: county permit records. Updated monthly.