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.

All counties Anne Arundel County Baltimore County Frederick County Howard County Prince George's County

All trades Accessory Structure Deck & Patio Electrical Exterior Fire Protection Gas Interior HVAC Plumbing Pool & Spa Sign Site Solar Structural

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
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
AA ROOTER LLC DBA ROOTERMAN Plumbing/Frederick County, Howard 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
HEIL PLUMBING DMV Plumbing/Howard County 103 permits/to Oct 2024
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
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
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
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
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
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
CLARKSBURG PLUMBING Plumbing/Frederick County, Howard County 86 permits/to Sep 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
Weisman Electric Company Electrical/Anne Arundel County, Frederick County, Howard County, Prince George's County 84 permits/to Sep 2026
MERRITT CONSTRUCTION SERVICES LLC Fire Protection/Baltimore County, Howard County 82 permits/to Jul 2026
J&R Plumbing & Heating Pool & Spa/Frederick County, Howard County 81 permits/to Sep 2026
D M V ELECTRICAL PROFESSIONALS Electrical/Howard County 80 permits/to May 2026
MAGOTHY ELECTRIC CO INC Electrical/Anne Arundel County, Howard County 79 permits/to Sep 2026
MID ATLANTIC DECK & FENCE COMPANY Deck & Patio/Anne Arundel County, Howard County 79 permits/to Aug 2026
SOLAR SME INC Solar/Frederick County, Howard County 79 permits/to Dec 2025
FREDERICK PLUMBING & HEATING Plumbing/Frederick County, Howard County 78 permits/to May 2026
JEM ELECTRIC CO INC Electrical/Anne Arundel County, Howard County 78 permits/to Sep 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
HOWARD PLUMBING LLC Plumbing/Anne Arundel County, Howard County 77 permits/to Sep 2026
PASADENA SIGN CO INC Sign/Anne Arundel County, Howard County 77 permits/to Aug 2026
REEDY ELECTRICAL SERVICES INC Electrical/Howard County 77 permits/to Aug 2026
ASC HEATING AND AIRCONDITIONING INC HVAC/Howard County 76 permits/to Aug 2026

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Source: county permit records. Updated weekly.