Guides · 5 min
Larger-home prior approval
The bigger single-storey rear extension uses a lighter process. Neighbours still get a say.
The larger limits
For a house, a single-storey rear extension can go further than the basic 3 or 4 metres by using prior approval: up to 6 metres for an attached house and 8 metres for a detached house. Height limits still apply, and the rights must still be there.
You tell the council. They tell the neighbours. If a neighbour objects, the council decides whether the impact on them is acceptable. If nobody objects in time, you can usually proceed.
What it is not
Prior approval is not a full design review, and it is not a yes for a two-storey extension or a wraparound. It is also unavailable where the rights have been removed, and it does not apply to flats.
Check with your council. Rules change, and every house is different.
Questions
Is the larger limit permanent?
The larger rear limits were made permanent in England. Still check the wording in force on the day you build.
What if my neighbour objects?
The council then judges the effect on that neighbour. An objection does not automatically mean a no.
Check with your council. Rules change, and every house is different.