Plan an extension
Type your postcode, pick your address, and say what you have in mind. We show whether you need to apply, what it would cost, and what it might add to the value. Free to try; from open data.
How it works
- Find the homeIts type, floor area and age from the energy certificate.
- Describe the ideaRear, side, two-storey, loft or garage, and how big.
- See the answerWhether you need to apply, what it costs, what it might add.
What you get
- Do you need to apply? The permitted development rules, in plain words, with what protects your street.
- What it costs. A range from published building costs, itemised. An estimate, not yet checked against builders' quotes.
- What it might add. From homes nearby that really grew and sold again (Plus).
- A plan sketch of the extension on your house, and what your neighbours built.
Contains public sector information licensed under the Open Government Licence v3.0. Sources are named beside each figure. How we know · All sources.