Two-storey extensions in Chesham
We design, get approval for and build two-storey extensions in Chesham and the surrounding area. Choose the type of extension below or book a free site visit.
Chesham at a glance
- Postcode districts
- HP5
- Area
- Buckinghamshire, England
- Price region
- South East England
- Nearest towns
- Amersham on the Hill (1.8 miles), Amersham (2.4 miles), Berkhamsted (4.4 miles), Chorleywood (4.8 miles)
- Distance to Milton Keynes
- about 24.5 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.
Around Chesham we also work in Amersham on the Hill, Amersham and Berkhamsted, and across the rest of Buckinghamshire. Postcode district in and near Chesham: HP5.
Extensions available in Chesham
Two-storey rear extensions
Design, approvals and build for Chesham homes. Guide from £61,500.
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Two-storey side extensions
For homes in Chesham: typical guide from £94,500.
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Two-storey wraparound extensions
Chesham guide price from £132,500, Standard spec.
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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
Guide from £34,500 in Chesham, including VAT.
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First-floor extensions
Guide from £27,500 in Chesham, including VAT.
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Two-storey extensions for semi-detached houses
Guide from £61,500 in Chesham, including VAT.
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Two-storey extensions for detached houses
From £94,500 in Chesham. Free visit to firm it up.
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Kitchen extensions with bedrooms above
Design, approvals and build for Chesham homes. Guide from £61,500 (before kitchen units).
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Extra bedroom and en-suite extensions
From £61,500 (plus en-suite) in Chesham. Free visit to firm it up.
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Chesham we measure distances to every boundary before suggesting a type.
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 Chesham
Chesham 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 Chesham
Do you cover Chesham?
Yes. We cover Chesham (HP5) and the surrounding area, including Amersham on the Hill and Amersham. The first site visit is free.
What does a two-storey extension cost in Chesham?
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 Chesham do you cover?
Everywhere around it, including Amersham on the Hill (1.8 miles), Amersham (2.4 miles) and Berkhamsted (4.4 miles), and the rest of Buckinghamshire.