Two-storey extensions in Chalfont Saint Peter
Need more room in Chalfont Saint Peter? Two-storey and first-floor extensions add bedrooms and living space without moving. Here's everything we offer locally.
Chalfont Saint Peter at a glance
- Postcode districts
- HP8
- Area
- Buckinghamshire, England
- Price region
- South East England
- Nearest towns
- Gerrards Cross (1.6 miles), Chorleywood (3.6 miles), Beaconsfield (3.9 miles), Rickmansworth (4 miles)
- Distance to Milton Keynes
- about 31.1 miles
- Approvals
- Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission.
We cover postcode district HP8 in and around Chalfont Saint Peter, along with neighbouring Gerrards Cross, Chorleywood and Beaconsfield.
Extensions available in Chalfont Saint Peter
Two-storey rear extensions
Our South East England guide starts at £61,500 for this type.
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Two-storey side extensions
For homes in Chalfont Saint Peter: typical guide from £94,500.
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Two-storey wraparound extensions
Guide from £132,500 in Chalfont Saint Peter, including VAT.
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Part single, part two-storey extensions
Our South East England guide starts at £79,000 for this type.
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Extensions over a garage
For homes in Chalfont Saint Peter: typical guide from £34,500.
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First-floor extensions
Guide from £27,500 in Chalfont Saint Peter, including VAT.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Chalfont Saint Peter homes. Guide from £61,500.
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Two-storey extensions for detached houses
From £94,500 in Chalfont Saint Peter. Free visit to firm it up.
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Kitchen extensions with bedrooms above
From £61,500 (before kitchen units) in Chalfont Saint Peter. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Our South East England guide starts at £61,500 (plus en-suite) for this type.
Learn moreWhich type suits your house?
Rear and side extensions suit most semi-detached and detached houses with room around them. Terraced and town-centre homes can take a two-storey extension too, with more care over neighbours, light and access.
Also available in Buckinghamshire
- Two-storey front extensions
- Two-storey extensions for end-of-terrace houses
- Two-storey annexe extensions
- Garage conversions with a room above
- Two-storey extension plans and drawings
- Planning permission for two-storey extensions
- Structural engineering for two-storey extensions
- Building regulations for two-storey extensions
- Party wall notices for extensions
- Design and build two-storey extensions
Rules for Chalfont Saint Peter
Chalfont Saint Peter is in England. Two-storey rear: up to 3 m deep and 7 m from the rear boundary under permitted development. Side, wraparound and front: planning permission. Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
The full England rules explained
Questions about extensions in Chalfont Saint Peter
Do you cover Chalfont Saint Peter?
Yes. We cover Chalfont Saint Peter (HP8) and the surrounding area, including Gerrards Cross and Chorleywood. The first site visit is free.
What does a two-storey extension cost in Chalfont Saint Peter?
Using our South East England guide, a two-storey rear extension with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) is about £61,500–£83,000 including VAT. An extension over a garage is about £34,500–£50,500.
Which other places near Chalfont Saint Peter do you cover?
Everywhere around it, including Gerrards Cross (1.6 miles), Chorleywood (3.6 miles) and Beaconsfield (3.9 miles), and the rest of Buckinghamshire.