Since 1980 Thomas Design Builders Ltd. (TDB) continues to offer unparalleled design build services focusing on one key principle: Design Control equals Cost Control . As Commercial Design Builders, TDB is here to partner with you from start to finish; taking your project from inception, through to successful completion. Thomas Design Builders will take the parameters outlined by our Customers to provide a complete turnkey project. This is a collaborative process with our in house design team coupled with years of costing and estimating experience.