- Aker
- Atomic Energy (AECL Candu)
- Bird Construction Ltd.
- Canada Post
- Carillion Canada Inc.
- Centreline Sanitation
- City of Hamilton
- City of North Bay
- City of Toronto
- Customs Canada
- Defence Construction Canada
- Demik Construction
- Department of National Defence
- Dowty Aerospace
- Dufferin Construction
- Eastern Construction
- EllisDon Construction
- Environment Canada
- Fisheries and Oceans Canada
- Ford Motor Corporation
- Gee-Whiz Portable Toilets
- Greater Toronto Airport Authority
- Hydro One
- Merit Contractors
- Ministry of Transportation
- Mobilease
- Municipality of Middlesex Canada
- Ontario Power Generation
- Parks Canada, Fort Smith, NT
- Public Works & Government Services Canada
- Rankin Construction Inc.
- Strabag International
- Supply Services Canada
- Toronto Transit Commission
- University of Western Ontario
- Willscot
Turkstra Modular Builders Inc. has been designing and building commercial and municipal office buildings for customers across Canada since 1995. Turkstra is a Design/Build construction company.