- Class "C"
- Clean out
- Clip ties
- CO
- Cold air return
- Collar beam
- Collar
- Column
- Combustion air
- Combustion chamber
- Compression web
- Compressor
- Concrete block
- Concrete board
- Concrete
- Condensation
- Condensing unit
- Conditions, Convenants, and Restrictions (CC and Rs)
- Conduction
- Conductivity
- Conduit, electrical
- Construction Contract
- Construction drywall
- Construction, frame
- Continuity tester
- Contractor
- Control joint
- Convection
- Cooling load
- Coped joint
- Coped
- Corbel
- Corner bead
- Corner boards
- Corner braces
- Cornice
- Counter flashing
- Counterfort