| Business | Phone |
| Vollmer Associates Llp 2321 Whitney Ave, Hamden 6518 | (203) 281-1350 |
| Salamone & Assoc 3035 Whitney Ave, Hamden 6518 | (203) 281-6895 |
| Peregrim Development Inc 1485 Dunbar Hill Rd, Hamden 6514 | (203) 288-4154 |
| General Drafting & Design Inc 2525 Whitney Ave, Hamden 6518 | (203) 288-6818 |
| Godfrey-Hoffman Assoc Llc 2911 Dixwell Ave # 101, Hamden 6518 | (203) 248-4217 |