You will need planning permission for your extension if it:

- covers more than half the area of land surrounding your home
- extends towards a road
- increases the overall height of the building
- extends more than 6m from the rear of an attached house (until 30 May 2019)
- extends more than 8m from the rear of a detached house (until 30 May 2019)
- is taller than 4m
- is more than half the width of your house
- uses different materials to those of the original house
- includes a balcony or raised veranda