| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | Hamilton Dillon Electric | 0 | |
| 2 | Hawkins And Associates | Civil engineering | 1 |
| 3 | Hawn Engineering Inc | Architect | 1 |
| 4 | Helen Barnick | Client | 1 |
| 5 | Helen L Barnich | Client | 1 |
| 6 | Hi Tech Sports Usa Inc | Client | 1 |
| 7 | Housing Auth Co of Stanislaus | Client | 2 |
| 8 | Howell Const. | General contractor | 1 |
| 9 | Howk Systems | Architect | 1 |
| 10 | Huff Construction | General contractor | 24 |