| Abbreviation | Definition |
|---|---|
| CIWI | Construction Industry Workshop Initiative |
| CJ | Construction Joint |
| CJP | Complete Joint Penetration |
| CJV | Construction Joint Venture |
| CKD | Complete Knock Down |
| CLFDB | Canadian Labour Force Development Board |
| CLGHT | Ceiling Height |
| CLH | Construction Laser Horizontal |
| Clk/Rm | Cloakroom |
| CLKG | Caulking |
| CLMA | Construction Labor Market Analyzer |
| CLN | Construction Loan Note |
| Clo. | Closet |
| CLP | Construction Linked Plan |
| CLRA | Construction Labour Relations Association |
| CLRF | Construction Legal Rights Foundation |
| CLSA | Construction Lawyers Society of America |
| CLSAB | Canadian Lumber Standards Accreditation Board |
| CLT | Cross-Laminated Timber |
| CLTF | Construction Laborers Trust Funds |