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 |
|---|---|---|---|---|
| OSPREY ELECTRIC LLC | HVAC | Howard County | 4 | Jun 2026 |
| ADVANCED GREEN HOME SOLUTIONS | HVAC | Howard County | 3 | Jul 2026 |
| Bradley L Gracey | HVAC | Frederick County | 3 | Jun 2026 |
| CHARLES A KLEIN & SONS, INC. | HVAC | Howard County | 3 | Jul 2026 |
| ENERGY-LINKS LLC | HVAC | Howard County | 3 | Jun 2026 |
| HARAMIS ELECTRIC | HVAC | Howard County | 3 | May 2026 |
| JKEENEY LLC | HVAC | Howard County | 3 | Jun 2026 |
| MAKK ELECTRICAL WORKS | HVAC | Howard County | 3 | Jul 2026 |
| MARQUESS HVAC | HVAC | Howard County | 3 | Jul 2026 |
| PERFECT PLUMBING | HVAC | Howard County | 3 | Jul 2026 |
| PERRY HALL HEATING & AIR CONDITIONING | HVAC | Howard County | 3 | Jul 2026 |
| TOTAL COMFORT HEATING & AIR CONDITIONING, INC. | HVAC | Howard County | 3 | Jul 2026 |
| UNITED AIR TEMP AC & HEATING LLC | HVAC | Howard County | 3 | Apr 2026 |
Source: county permit records. Updated monthly.