| Business | Phone |
| Grand Valley Aggregate Ltd 94 Newkirk Rd, Richmond Hill L4C 3G3 | (519) 928-3100 |
| Leona Stone & Building Supls 13265 Yonge St, Richmond Hill L4E 3L2 | (905) 773-4251 |
| Sandhill Aggregates Ltd 9251 Yonge St #400, Richmond Hill L4C 9T3 | (905) 764-0363 |