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.

• HARKINS BUILDERS INC Structural/Howard County 111 permits/to Mar 2026
• AMERIGAS PROPANE L.P. DBA SERVICEMARK HVAC/Howard County 110 permits/to Apr 2026
• THOMAS M GRUENTZEL Electrical/Frederick County 110 permits/to May 2024
• CHESAPEAKE ENERGY SOLUTIONS LLC Electrical/Anne Arundel County, Howard County 109 permits/to Aug 2026
• WHITE SPARK ELECTRIC Electrical/Anne Arundel County, Frederick County, Howard County 109 permits/to Aug 2026
• CLARKSVILLE PLUMBING LLC Plumbing/Anne Arundel County, Howard County 108 permits/to Aug 2026
• WILLIAM H. METCALFE & SONS, INC HVAC/Anne Arundel County, Howard County, Prince George's County 107 permits/to Sep 2026
• Barnabas domowski Deck & Patio/Baltimore County, Frederick County 105 permits/to Jul 2026
• METROPOLITAN FIRE PROTECTION Fire Protection/Anne Arundel County, Baltimore County, Frederick County, Prince George's County 105 permits/to Sep 2026
• 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
• MASTERS MID ATLANTIC LLC DBA AIRTRON LLC HVAC/Anne Arundel County, Howard County 104 permits/to Aug 2026
• WILLIAMSBURG GROUP LLC Site/Baltimore County, Howard County 104 permits/to Aug 2026
• DUKE HEINTZELMAN HVAC/Frederick County 103 permits/to Apr 2025
• HEIL PLUMBING DMV Plumbing/Howard County 103 permits/to Oct 2024
• JAMES M. SCANLON Accessory Structure/Frederick County 103 permits/to Aug 2026
• John Thompson Accessory Structure/Baltimore County 103 permits/to Nov 2023
• SUBURBAN PROPANE Plumbing/Anne Arundel County, Baltimore County, Frederick County, Howard County 103 permits/to Sep 2026
• HUNT PLUMBING HEATING AND AIR CONDITIONING, LLC HVAC/Howard County 102 permits/to Sep 2026
• THREE BROTHERS SERVICES LLC Electrical/Anne Arundel County, Howard County, Prince George's County 102 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
• HAAS & SONS ELECTRIC INC Electrical/Anne Arundel County, Howard County, Prince George's County 99 permits/to Aug 2026
• PRIME PLUMBING Plumbing/Anne Arundel County, Howard County 99 permits/to Sep 2026
• SUNRUN INSTALLATION SVCS Solar/Anne Arundel County 99 permits/to Sep 2026
• 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
• WINN ELECTRIC CONTRACTING CO Accessory Structure/Anne Arundel County, Howard County 97 permits/to Sep 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
• PULTE HOME COMPANY LLC Accessory Structure/Anne Arundel County, Howard County 94 permits/to Jul 2026
• CHASE PLUMBING & WELL SERVICES Plumbing/Anne Arundel County, Frederick County, Howard County 93 permits/to Aug 2026
• MILLER FIRE PROTECTION INC Fire Protection/Anne Arundel County, Baltimore County 93 permits/to Sep 2026
• RISK MANAGEMENT CONSULTANTS LLC Electrical/Howard County 92 permits/to Apr 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
• CUSTOM WORKS INC Deck & Patio/Anne Arundel County, Howard County 88 permits/to Aug 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
• JAMES RUBUSH Deck & Patio/Baltimore County 84 permits/to Nov 2023

Source: county permit records. Updated weekly.