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 |
|---|---|---|---|---|
| J&R Plumbing & Heating | Pool & Spa | Frederick County, Howard County | 12 | Jul 2026 |
| PARAMOUNT ELECTRIC CO., INC. | Pool & Spa | Frederick County, Howard County | 11 | Jul 2026 |
| PERFATER G MATTHEW | Pool & Spa | Howard County | 5 | Jun 2026 |
| SUBURBAN PROPANE | Pool & Spa | Frederick County, Howard County | 4 | Jul 2026 |
| ANTHONY & SYLVAN CORP | Pool & Spa | Howard County | 3 | Jul 2026 |
| ENERGETIC ELECTRIC LLC | Pool & Spa | Howard County | 3 | Jul 2026 |
| JOHNSTON ELECTRIC | Pool & Spa | Frederick County, Howard County | 3 | Jul 2026 |
| PJS ELECTRICAL | Pool & Spa | Howard County | 3 | Jul 2026 |
Source: county permit records. Updated monthly.