Two-storey extensions in Beaconsfield
Homeowners in Beaconsfield can use us for the whole project or just the drawings and approvals. Start with a free visit.
Beaconsfield at a glance
- Postcode districts
- HP9 and HP10
- Area
- Buckinghamshire, England
- Price region
- South East England
- Nearest towns
- Chalfont Saint Peter (3.9 miles), Amersham (4 miles), Gerrards Cross (4.3 miles), High Wycombe (4.5 miles)
- Distance to Milton Keynes
- about 30 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.
Beaconsfield sits about 30.0 miles from Milton Keynes. Closer to home, Chalfont Saint Peter is 3.9 miles away and Amersham 4.0 miles.
Extensions available in Beaconsfield
Two-storey rear extensions
Beaconsfield guide price from £61,500, Standard spec.
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Two-storey side extensions
For homes in Beaconsfield: typical guide from £94,500.
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Two-storey wraparound extensions
Our South East England guide starts at £132,500 for this type.
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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
Beaconsfield guide price from £34,500, Standard spec.
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First-floor extensions
Our South East England guide starts at £27,500 for this type.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Beaconsfield homes. Guide from £61,500.
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Two-storey extensions for detached houses
For homes in Beaconsfield: typical guide from £94,500.
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Kitchen extensions with bedrooms above
From £61,500 (before kitchen units) in Beaconsfield. Free visit to firm it up.
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Extra bedroom and en-suite extensions
For homes in Beaconsfield: typical guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
If you're not sure which type fits, that's what the free visit is for. We'll sketch the realistic options for your house in Beaconsfield, with a rough idea of the approval route and cost for each.
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 Beaconsfield
Beaconsfield 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 Beaconsfield
Do you cover Beaconsfield?
Yes. We cover Beaconsfield (HP9 and HP10) and the surrounding area, including Chalfont Saint Peter and Amersham. The first site visit is free.
What does a two-storey extension cost in Beaconsfield?
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 Beaconsfield do you cover?
Everywhere around it, including Chalfont Saint Peter (3.9 miles), Amersham (4 miles) and Gerrards Cross (4.3 miles), and the rest of Buckinghamshire.