FAQ
Rear extension FAQ
Common questions about rear extensions, answered briefly. Our guides go into more detail.
FAQ
Questions people ask
How much does a rear extension cost?
As a guide, £1,900–£3,100 per m² including VAT for a standard single-storey extension at our West Midlands baseline.
How far can I extend without planning?
In England, a single-storey rear extension can usually go 3 metres on an attached house or 4 metres on a detached house without an application, or 6 and 8 metres with prior approval. Wales allows up to 4 metres for many houses, and Scotland and Northern Ireland have their own limits. Conservation areas and removed rights change the answer, so use our depth checker or ask us.
Do I always need Building Regulations?
Yes.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
How long does it take?
10 to 16 weeks on site for single-storey, 16 to 26 weeks for two-storey, after design and approvals.
Is the survey free?
Yes, the site visit and measured survey are free and without obligation. Remote island addresses are by arrangement.
Do you fit kitchens?
Yes, ones you buy or ones supplied through us.
Can I stay at home?
Usually, yes.
Who builds it?
Vetted building teams working under contract to us; your contract is with us.
Do you cover Scotland and Northern Ireland?
Yes, with their own planning and building rules.