| Business | Phone |
| Adtek Engineers Inc 3251 Old Lee Hwy 405, Fairfax 22030 | (703) 691-4040 |
| Apce 5920 Colchester Rd, Fairfax 22030 | (703) 818-9499 |
| Bei Structural Engineers 3928 Pender Dr 200, Fairfax 22030 | (703) 890-5000 |
| Jolles & Mc Kenzie Pa 3408 Brookwood Dr A, Fairfax 22030 | (703) 359-6868 |
| Russello Engineering Svc 3923 Old Lee Hwy 63a, Fairfax 22030 | (703) 385-5556 |
| Wiss Janney Elstner Assoc Inc 2721 Prosperity Ave 300, Fairfax 22031 | (703) 641-4601 |
| Olde Town Engineering Co Pc 10527 Braddock Rd # D, Fairfax 22032 | (703) 978-7500 |