| Business | Phone |
| A G Schmidt Structural Design 4415 Cowell Rd # 200d, Concord 94518 | (925) 933-3169 |
| Alan R Horeis Structural Engr 5063 Commercial Cir # I, Concord 94520 | (925) 935-8001 |
| Jmec Engineering Inc 2975 Treat Blvd # B2, Concord 94518 | (925) 969-1081 |
| Alan R Horeis Structural Engr 5063 Commercial Cir # I, Concord 94520 | (925) 288-9860 |
| Fritz Wu Structural Engineer 1987 Bonifacio St, Concord 94520 | (925) 827-0301 |
| Lewis & Assoc 5538 Pamplona Ct, Concord 94521 | (925) 672-9614 |
| Schmidt Ag Inc 4415 Cowell Rd, Concord 94518 | (925) 689-9130 |
| Seismic Engineering & Constr 2231 Commerce Ave, Concord 94520 | (925) 288-0988 |