| Abbreviation | Definition |
|---|---|
| CICA | Context Inspired Component Architecture |
| CICE | Certified Independent Checking Engineer |
| CIFA | Cape Institute for Architecture |
| CIOB | Chartered Institute Of Building |
| CIP | Cast In Place |
| CIPH | Canadian Institute of Plumbing and Heating |
| CISC | Canadian Institute of Steel Construction |
| CITA | Centre for Information Technology and Architecture |
| CIVA | Centre International pour la Ville, l'Architecture et le Paysage (French: International Center for Urbanism, Architecture and Landscape; Belgium) |
| CJ | Center Joint |
| CJ | Construction Joints |
| CK | Center Kitchen |
| CL | Cat Ladder |
| CL | Ceiling Level |
| CLAB | Columbia Laboratory for Architectural Broadcasting |
| CLARB | Council of Landscape Architectural Registration Boards |
| CLSA | Certified Lead System Architect |
| CLSAB | Canadian Lumber Standards Accreditation Board |
| CM | Case Marker |
| CM | Contoured and Molded |