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 |
|---|---|---|---|---|
| JENSON FIRE PROTECTION INC | Fire Protection | Frederick County | 73 | Jul 2026 |
| BLAZEGUARD, INC. | Fire Protection | Frederick County | 32 | Jul 2026 |
| BARRY DETWILER | Fire Protection | Frederick County | 15 | Jun 2026 |
| SPRINKLERS,LLC FIRE TECH RESID | Fire Protection | Frederick County | 12 | Jul 2026 |
| MACE ENTERPRISES LLC | Fire Protection | Howard County | 8 | Jun 2026 |
| Fireline Powered by Encore-Sprinkler | Fire Protection | Frederick County | 7 | Jun 2026 |
| JUDD FIRE PROTECTION, INC. | Fire Protection | Frederick County | 6 | Jun 2026 |
| AMAZING PLUMBING HEATING AND AIR | Fire Protection | Howard County | 4 | Jun 2026 |
| BILL-CHARLES W SAUNDERS | Fire Protection | Frederick County | 3 | Apr 2026 |
| JESSICA HICKMAN | Fire Protection | Frederick County | 3 | Jul 2026 |
| MERRITT CONSTRUCTION SERVICES LLC | Fire Protection | Howard County | 3 | Jun 2026 |
| R K OWINGS INC | Fire Protection | Howard County | 3 | Jul 2026 |
| Services LLC Guardian fire protection | Fire Protection | Frederick County | 3 | Jun 2026 |
Source: county permit records. Updated monthly.