| Business | Phone |
| Advanced Plant Engineering Inc 600 N Tustin St, Orange 92867 | (714) 664-0014 |
| Allard Engineering Co 952 N Elm St, Orange 92867 | (714) 639-9640 |
| B & N Construction Inc 1547 E San Carlos Pl, Orange 92865 | (714) 974-2072 |
| G & G Engineering Inc 1855 W Katella Ave, Orange 92867 | (714) 997-0640 |
| Gdg Builders 7615 E Crown Pkwy, Orange 92867 | (714) 279-9255 |
| M K Contruction Inc 1040 W Hoover Ave, Orange 92867 | (714) 639-8425 |
| Mega Innovations Technology 948 N Elm St, Orange 92867 | (714) 538-0213 |
| Mrh Structural Eng Inc 1411 N Batavia St # 202, Orange 92867 | (714) 633-6302 |
| Myhra & Assoc 1855 W Katella Ave # 320, Orange 92867 | (714) 771-7672 |
| Olsson Construction 326 W Katella Ave # 4j, Orange 92867 | (714) 516-9496 |
| Sky Leading 948 N Elm St, Orange 92867 | (714) 538-5063 |
| Zuniga Construction Inc 856 N Elm St, Orange 92867 | (714) 639-4473 |