| Business | Phone |
| Peter Baldur 235 Maple Ave, Smithtown 11787 | (631) 724-5026 |
| Mark Mancini Architect 285 E Main St # 208, Smithtown 11787 | (631) 979-0104 |
| Steven Cataldo 14 Karl Ave, Smithtown 11787 | (631) 724-2141 |
| Mc Donough & Conroy Pc 308 W Main St # 202, Smithtown 11787 | (631) 491-6400 |
| Gary Pedersen 17 Terrace Ln, Smithtown 11787 | (631) 724-0700 |
| Jmp Architects 548 W Jericho Tpke, Smithtown 11787 | (631) 265-4611 |
| Robert E O'shea Architect Pc 821 W Jericho Tpke, Smithtown 11787 | (631) 864-3137 |
| Yani Pavlidis Arch & Planner 16 High Gate Dr, Smithtown 11787 | (631) 265-0536 |