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

UNITED AIR TEMP HVAC/Anne Arundel County, Frederick County, Howard County 245 permits/to Sep 2026
7820-A AIRPARK ROAD Plumbing/Anne Arundel County 238 permits/to Sep 2026
MAHON PLUMBING INC Plumbing/Anne Arundel County, Frederick County, Howard County 237 permits/to Sep 2026
RF Gauss Assoc Inc Structural/Frederick County 237 permits/to Sep 2026
EDGE ENERGY Solar/Anne Arundel County, Frederick County, Howard County 235 permits/to Sep 2026
Ramiro A Fernandez Electrical/Frederick County 232 permits/to Aug 2026
CELESTIAL SOLAR INNOVATIONS LLC Solar/Anne Arundel County, Frederick County, Howard County 229 permits/to Sep 2026
D. W. BAHR PLUMBING Plumbing/Howard County 229 permits/to Sep 2026
J. A. SMITH & CO. INC. Plumbing/Anne Arundel County, Frederick County, Howard County 227 permits/to Sep 2026
T & A Contractors, Inc. Deck & Patio/Anne Arundel County, Baltimore County, Frederick County, Howard County 226 permits/to Sep 2026
CHARLES A KLEIN & SONS, INC. HVAC/Anne Arundel County, Frederick County, Howard County, Prince George's County 224 permits/to Sep 2026
SPRINKLERS,LLC FIRE TECH RESID Fire Protection/Frederick County 222 permits/to Aug 2026
BLUE DOT SERVICES HVAC/Howard County 218 permits/to Sep 2026
BELAIR ENGINEERING & SERVICE HVAC/Anne Arundel County, Prince George's County 216 permits/to Sep 2026
ROYAL ELECTRIC INC Electrical/Anne Arundel County, Frederick County, Howard County 216 permits/to Sep 2026
AMERICAN RESIDENTIAL SERVICE HVAC/Howard County 213 permits/to Oct 2024
STANDARD ENERGY SOLUTIONS Solar/Anne Arundel County, Baltimore County, Frederick County, Howard County, Prince George's County 210 permits/to Sep 2026
ROBERT A TULL INC Plumbing/Frederick County, Howard County 207 permits/to Aug 2026
TRINITY SOLAR LLC Solar/Anne Arundel County, Baltimore County, Frederick County, Howard County, Prince George's County 204 permits/to Sep 2026
MILES ELECTRIC CO INC Electrical/Anne Arundel County, Frederick County, Howard County 202 permits/to Sep 2026
SOUTHERN MARYLAND HTG & AIR HVAC/Anne Arundel County 200 permits/to Sep 2026
LARRY & SONS INC HVAC/Frederick County 198 permits/to Sep 2026
Steven Castillo Deck & Patio/Baltimore County 198 permits/to Apr 2023
B & B AIR CONDITIONING & HEATING HVAC/Howard County 194 permits/to Sep 2026
D. W. BAHR PLUMBING & HEATING INC Plumbing/Howard County 191 permits/to Oct 2024
DAWN LAWSON Accessory Structure/Frederick County 187 permits/to Sep 2026
SCOTT MERCER LLC Pool & Spa/Frederick County, Howard County 187 permits/to Aug 2026
O'REILLY ELECTRIC Accessory Structure/Anne Arundel County, Howard County 185 permits/to Aug 2026
Top tier solar solutions LLC Solar/Anne Arundel County, Frederick County, Howard County 185 permits/to Aug 2026
JOSEPH HEIL CO INC. Plumbing/Howard County 184 permits/to Sep 2024
NORTHERN CROSS ELECTRIC INC Electrical/Frederick County, Howard County 184 permits/to Aug 2026
Suzanne Wiley Fire Protection/Baltimore County 182 permits/to Jan 2024
WL STATON PLUMBING HTNG & COOL HVAC/Anne Arundel County 177 permits/to Sep 2026
TRI-STATE HOME SERVICES HVAC/Frederick County, Howard County 174 permits/to Sep 2026
Rodgers Consulting Inc - Yellow Team Site/Frederick County 173 permits/to Sep 2026
TITAN PLUMBING INC Plumbing/Anne Arundel County, Howard County 173 permits/to May 2026
US HOMES LLC Fire Protection/Baltimore County, Howard County 172 permits/to Mar 2024
CLARKSVILLE CONSTRUCTION SERVICES Deck & Patio/Howard County 169 permits/to Sep 2026
Wenbrooke Services Electrical/Frederick County, Howard County 169 permits/to Aug 2026
Andrew Weinberg Deck & Patio/Baltimore County 168 permits/to Aug 2026
BUILD AND DESIGN CONSTRUCTION INC Plumbing/Anne Arundel County, Frederick County, Howard County 168 permits/to Aug 2026
Kayla Booz Deck & Patio/Baltimore County 164 permits/to Aug 2022
RENOVATION EXPERTS INC Plumbing/Frederick County 161 permits/to Aug 2026
TERRA SOLUTIONS ENGINEERING TERRA SOLUTIONS ENGINEERING Site/Frederick County 161 permits/to Aug 2026
David Williams Electric Accessory Structure/Howard County 159 permits/to Sep 2026
ASSOCIATES PLUMBING INC Plumbing/Anne Arundel County, Frederick County, Howard County 157 permits/to Aug 2026
ELECTRICAL CONNECTIONS LLC Electrical/Frederick County, Howard County 157 permits/to Sep 2026
BRUCE BOYD Plumbing/Frederick County 156 permits/to Aug 2026
HARAMIS ELECTRIC HVAC/Anne Arundel County, Howard County 154 permits/to Sep 2026
Grove Heating & Cooling Inc HVAC/Anne Arundel County, Howard County 152 permits/to Sep 2026

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Source: county permit records. Updated weekly.