| Business | Phone |
| Charles Saul Engineering 4308 University Ave, Des Moines 50311 | (515) 279-3900 |
| Dennis & Magnani Structural 525 Sw 5th St D, Des Moines 50309 | (515) 243-5522 |
| Shuck Britson Inc 2409 Grand Ave, Des Moines 50312 | (515) 243-4477 |
| Korpela Engineering 1239 73rd St C, Des Moines 50311 | (515) 271-0655 |
| James W Wilson 3926 Brinkwood Rd, Des Moines 50310 | (515) 276-2031 |