Checked 27 October 2026
UK building glossary
Short definitions of planning and building terms homeowners meet most often, each with an official source and a note where the nations differ. No substitute for advice on your own project.
A
B
C
- CDM Regulations
- Class A permitted development
- Class AA upward extension
- Class B roof alterations
- Community Infrastructure Levy
- Competent person scheme
- Completion certificate
- Conservation area
D
E
F
H
L
M
N
O
P
- Party Wall etc. Act 1996
- Party Wall notice
- Permitted development
- Principal contractor
- Principal designer
- Prior approval