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 |
|---|---|---|---|---|
| OLYMPUS ELECTRIC LLC | Accessory Structure | Frederick County, Howard County | 5 | Jul 2026 |
| ONEIL PLUMBING | Plumbing | Howard County | 5 | Jun 2026 |
| PERFATER G MATTHEW | Pool & Spa | Howard County | 5 | Jun 2026 |
| RYAN ELECTRIC | Electrical | Howard County | 5 | Jul 2026 |
| SHANNON-BAUM SIGNS INC | Sign | Howard County | 5 | Jun 2026 |
| ST JOHN PROPERTIES INC | HVAC | Howard County | 5 | Jul 2026 |
| STRATEGIC FACTORY | Sign | Frederick County, Howard County | 5 | Jun 2026 |
| TECHMARK CORPORATION | Electrical | Howard County | 5 | Jul 2026 |
| THREE BROTHERS SERVICES LLC | Accessory Structure | Howard County | 5 | Jul 2026 |
| VALLEY DECK & PATIO | Deck & Patio | Howard County | 5 | Jul 2026 |
| A AFFORDABLE ELECTRIC SERVICE LLC | Deck & Patio | Howard County | 4 | Jun 2026 |
| ALTERNATIVE ROOFING INC | Howard County | 4 | Apr 2026 | |
| AMAZING PLUMBING HEATING AND AIR | Fire Protection | Howard County | 4 | Jun 2026 |
| AMERICAN HOME CONTRACTORS | Accessory Structure | Howard County | 4 | Jun 2026 |
| AMERICAN MASTERS PLUMBING CO LLC | Plumbing | Howard County | 4 | Jun 2026 |
| ARDO CONTRACTING INC | Deck & Patio | Howard County | 4 | Jul 2026 |
| BAY AREA MECHANICAL SERVICES, INC | HVAC | Howard County | 4 | Jul 2026 |
| BUILD HD LLC | Deck & Patio | Frederick County, Howard County | 4 | Jun 2026 |
| BURIC'S HEATING & AIR CONDITIONING, INC. | HVAC | Howard County | 4 | Jul 2026 |
| CAMPBELL & SON ELECTRIC | Electrical | Howard County | 4 | Jul 2026 |
| CAPITAL A ELECTRIC | Electrical | Howard County | 4 | Jul 2026 |
| CAPITAL SITE LIGHTING LLC | Sign | Howard County | 4 | May 2026 |
| CARUSO HOMES ON YOUR LOT MD 1, LLC | Site | Howard County | 4 | Jul 2026 |
| CATONS PLUMBING, DRAINS AND HEATING | Plumbing | Howard County | 4 | Jun 2026 |
| CATONSVILLE PROFESSIONAL SERVICES | Plumbing | Howard County | 4 | Jul 2026 |
| CK ELECTRIC LLC | Accessory Structure | Howard County | 4 | Jul 2026 |
| CLARKSVILLE HEATING & AIR, LLC | Structural | Howard County | 4 | Jul 2026 |
| C.M.H. LLC DBA CROPPMETCALFE | HVAC | Howard County | 4 | Jul 2026 |
| CONFERS PLUMBING LLC | Plumbing | Howard County | 4 | Jun 2026 |
| C & S MECHANICAL, LLC | Plumbing | Howard County | 4 | Jul 2026 |
| DECKMASTER INC DBA TRUEDECKS | Deck & Patio | Howard County | 4 | Jun 2026 |
| DESHAIES ELECTRICAL SERVICES LLC | Electrical | Howard County | 4 | Jul 2026 |
| DIAMOND DECKS & HOME IMPROVEMENT | Deck & Patio | Howard County | 4 | Jun 2026 |
| ECOMIZE USA LLC | Electrical | Howard County | 4 | Jun 2026 |
| ENDZEL PLUMBING LLC | Plumbing | Howard County | 4 | May 2026 |
| FA OUTDOOR SPACES LLC | Deck & Patio | Frederick County, Howard County | 4 | Jul 2026 |
| GLM MECHANICAL SERVICES INC. | HVAC | Howard County | 4 | Jun 2026 |
| HAAS & SONS ELECTRIC INC | Electrical | Howard County | 4 | Jul 2026 |
| HVACR 05010083311 | HVAC | Howard County | 4 | Jun 2026 |
| J & A CONSTRUCTION SERVICES, INC. | Plumbing | Howard County | 4 | Jun 2026 |
| KINSLEY CONSTRUCTION LLC | Plumbing | Frederick County, Howard County | 4 | Jun 2026 |
| Mallick Mechanical Contractors | Plumbing | Frederick County, Howard County | 4 | Jun 2026 |
| MARTIN MCMAHON | Deck & Patio | Howard County | 4 | Jun 2026 |
| MCALLISTER PLUMBING INC | Plumbing | Howard County | 4 | Jul 2026 |
| MCGUIRE PLUMBING & HEATING, INC. | Plumbing | Howard County | 4 | Jul 2026 |
| MICHAEL TRASK BODYCOMB | HVAC | Howard County | 4 | Jul 2026 |
| Nova Solar, Inc. | Solar | Frederick County, Howard County | 4 | Jul 2026 |
| OSPREY ELECTRIC LLC | HVAC | Howard County | 4 | Jun 2026 |
| OWINGS HOME SERVICES | Deck & Patio | Frederick County, Howard County | 4 | Jun 2026 |
| OWINGS MECHANICAL | Plumbing | Howard County | 4 | Jul 2026 |
Source: county permit records. Updated monthly.