Contractor permit directory

Contractors observed in Maryland county permit records, grouped from public filings. Our observation is not complete: not every filing names a contractor, so a firm's real activity is almost always greater than what appears here.

• AA ROOTER LLC DBA ROOTERMAN Plumbing/Frederick County, Howard County 104 permits/to Sep 2026
• CHRIS WING HVAC/Frederick County, Prince George's County 104 permits/to Sep 2026
• DUKE HEINTZELMAN HVAC/Frederick County 103 permits/to Apr 2025
• JAMES M. SCANLON Accessory Structure/Frederick County 103 permits/to Aug 2026
• SUBURBAN PROPANE Plumbing/Anne Arundel County, Baltimore County, Frederick County, Howard County 103 permits/to Sep 2026
• WESLEY BARR HVAC/Frederick County 102 permits/to Aug 2026
• Donald W Guyton Inc Electrical/Frederick County 100 permits/to Sep 2026
• ARK SYSTEMS INC Electrical/Anne Arundel County, Frederick County, Howard County 99 permits/to Jul 2026
• Ehrhardt Brothers Quality Plumbing Plumbing/Frederick County, Howard County 99 permits/to Oct 2025
• SUSTAINABLE ENERGY SYSTEMS Solar/Anne Arundel County, Baltimore County, Frederick County, Howard County 98 permits/to Aug 2026
• BOYLAND ELECTRIC INC Electrical/Frederick County, Howard County 97 permits/to Aug 2026
• GREENBRILLIANCE LLC Solar/Anne Arundel County, Frederick County, Howard County, Prince George's County 97 permits/to Aug 2026
• Robbie Norwood Electrical/Frederick County 97 permits/to Aug 2026
• Barrick & Sons Lawn Service LLC Deck & Patio/Frederick County, Howard County 95 permits/to Aug 2026
• C & R ELECTRIC INC Electrical/Anne Arundel County, Frederick County, Howard County 94 permits/to Sep 2026
• CHASE PLUMBING & WELL SERVICES Plumbing/Anne Arundel County, Frederick County, Howard County 93 permits/to Aug 2026
• RLT PLUMBING Gas/Anne Arundel County, Frederick County, Howard County 90 permits/to Aug 2026
• Addicks Electric LLC HVAC/Frederick County, Howard County 89 permits/to May 2026
• ELITE DECKS & PATIOS OF MD LLC Deck & Patio/Frederick County, Howard County 89 permits/to Sep 2026
• Reed and Son Services, LLC Plumbing/Frederick County 89 permits/to Sep 2026
• LONG FENCE COMPANY INCORPORATED Deck & Patio/Baltimore County, Frederick County, Howard County 87 permits/to Jul 2026
• Michael P O'Connor Electrical/Frederick County 87 permits/to Apr 2026
• CLARKSBURG PLUMBING Plumbing/Frederick County, Howard County 86 permits/to Sep 2026
• MARK L MCLAUGHLIN Plumbing/Frederick County 86 permits/to Aug 2026
• Premier Fire Protection Services LLC Fire Protection/Frederick County 85 permits/to Aug 2026
• CLARKSVILLE ELECTRIC LLC Electrical/Anne Arundel County, Frederick County, Howard County 84 permits/to Sep 2026
• Redstone Electric, Inc. Electrical/Frederick County, Howard County 84 permits/to Jun 2026
• ROMAN MECHANICAL INC Plumbing/Frederick County, Howard County 84 permits/to Aug 2026
• T BRADLEY ROHRER Plumbing/Frederick County 84 permits/to Aug 2026
• Weisman Electric Company Electrical/Anne Arundel County, Frederick County, Howard County, Prince George's County 84 permits/to Sep 2026
• Home Express Delivery Service LLC Plumbing/Frederick County 82 permits/to Jan 2026
• Rodgers RCI Survey Team Structural/Frederick County 82 permits/to Aug 2026
• J&R Plumbing & Heating Pool & Spa/Frederick County, Howard County 81 permits/to Sep 2026
• Grossnickle Construction LLC Accessory Structure/Frederick County 80 permits/to Aug 2026
• GLADHILL PLUMBING & HTG Plumbing/Frederick County 79 permits/to Sep 2026
• SOLAR SME INC Solar/Frederick County, Howard County 79 permits/to Dec 2025
• AC&T Plumbing/Frederick County 78 permits/to Sep 2026
• FREDERICK PLUMBING & HEATING Plumbing/Frederick County, Howard County 78 permits/to May 2026
• KOLB ELECTRIC INC Electrical/Anne Arundel County, Frederick County, Howard County 78 permits/to Sep 2026
• CASTAWAY PLUMBING Plumbing/Anne Arundel County, Frederick County, Howard County 77 permits/to Sep 2026
• PRO HOME IMPROVEMENT , LLC Plumbing/Frederick County, Howard County 76 permits/to Sep 2026
• Dorcus Construction Company Inc. Plumbing/Frederick County 74 permits/to Aug 2026
• KAYWELL CONSTRUCTION CORPORATION Electrical/Frederick County, Howard County, Prince George's County 74 permits/to Sep 2026
• MDP DECK AND PATIOS LLC Deck & Patio/Frederick County, Howard County 73 permits/to Sep 2026
• ECOMIZE USA LLC HVAC/Anne Arundel County, Frederick County, Howard County 72 permits/to Aug 2026
• Henicle's Plumbing, Inc. Plumbing/Frederick County 72 permits/to Aug 2026
• PRECISION ELECTRICAL SOLUTIONS Electrical/Anne Arundel County, Frederick County, Howard County 72 permits/to Aug 2026
• Premier Choice Services Frederick County 72 permits/to Aug 2024
• Tuckers Air Conditioning, Heating and Plumbing HVAC/Frederick County 72 permits/to Aug 2026
• CHARLES A HORN Electrical/Frederick County 70 permits/to Jul 2026

Source: county permit records. Updated weekly.