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 |
|---|---|---|---|---|
| ALBAUGH & SONS LLC | Electrical | Frederick County | 9 | 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 |
| CLARKSBURG PLUMBING | Plumbing | Frederick 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 |
| Holtzolpe inc. | Electrical | Frederick 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 |
| Reed and Son Services, LLC | Plumbing | Frederick County | 9 | Jul 2026 |
| RENOVATIONS EXPERT INC | Electrical | Howard County | 9 | Jul 2026 |
| ALLEN B COBLENTZ | Electrical | Frederick County | 8 | 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 |
| Cody Wachter | Pool & Spa | Frederick County | 8 | Jun 2026 |
| Eagle Plumbing | Plumbing | Frederick County | 8 | Jul 2026 |
| FREEDOM FOREVER MARYLAND LLC | Solar | Howard County | 8 | Jun 2026 |
| KIM SIMPSON | Electrical | Frederick County | 8 | Jul 2026 |
| MACE ENTERPRISES LLC | Fire Protection | Howard County | 8 | Jun 2026 |
| MARK L MCLAUGHLIN | Plumbing | Frederick County | 8 | Jul 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 |
| Weisman Electric Company | Electrical | Frederick County | 8 | Jun 2026 |
| Wenbrooke Services | Accessory Structure | Frederick 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 |
| Fireline Powered by Encore-Sprinkler | Fire Protection | Frederick County | 7 | Jun 2026 |
| Fortress Foundation Solutions | Structural | Frederick County, Howard County | 7 | Jul 2026 |
| GARTLAND PLUMBING INC | Plumbing | Howard County | 7 | Jun 2026 |
| GOT ELECTRIC LLC GOT ELECTRIC LLC | Electrical | Frederick County | 7 | Jul 2026 |
| GREEN ELECTRIC SOLUTIONS LLC | HVAC | Howard County | 7 | Jul 2026 |
| GUS D BISER | Electrical | Frederick County | 7 | Jul 2026 |
| HATZEL & BUEHLER | Electrical | Howard County | 7 | Jul 2026 |
| HERVE BILLIET | Solar | Howard County | 7 | Jul 2026 |
| J&M SERVICES | Sign | Howard County | 7 | May 2026 |
Source: county permit records. Updated monthly.