Two-storey extensions in Aylesbury
Everything for a two-storey extension in Aylesbury, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Aylesbury at a glance
- Postcode districts
- HP17, HP19, HP20, HP21 and HP22
- Area
- Buckinghamshire, England
- Price region
- South East England
- Nearest towns
- Tring (6.9 miles), Thame (8.4 miles), Leighton Buzzard (9.6 miles), Berkhamsted (11.3 miles)
- Distance to Milton Keynes
- about 15.7 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 districts HP17, HP19, HP20, HP21 and HP22 in and around Aylesbury, along with neighbouring Tring, Thame and Leighton Buzzard.
Extensions available in Aylesbury
Two-storey rear extensions
Our South East England guide starts at £61,500 for this type.
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Two-storey side extensions
Our South East England guide starts at £94,500 for this type.
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Two-storey wraparound extensions
Guide from £132,500 in Aylesbury, including VAT.
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Part single, part two-storey extensions
For homes in Aylesbury: typical guide from £79,000.
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Extensions over a garage
For homes in Aylesbury: typical guide from £34,500.
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First-floor extensions
Design, approvals and build for Aylesbury homes. Guide from £27,500.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Aylesbury homes. Guide from £61,500.
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Two-storey extensions for detached houses
Aylesbury guide price from £94,500, Standard spec.
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Kitchen extensions with bedrooms above
From £61,500 (before kitchen units) in Aylesbury. Free visit to firm it up.
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Extra bedroom and en-suite extensions
From £61,500 (plus en-suite) in Aylesbury. Free visit to firm it up.
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 Aylesbury, 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 Aylesbury
Aylesbury 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 Aylesbury
Do you cover Aylesbury?
Yes. We cover Aylesbury (HP17, HP19, HP20, HP21 and HP22) and the surrounding area, including Tring and Thame. The first site visit is free.
What does a two-storey extension cost in Aylesbury?
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 Aylesbury do you cover?
Everywhere around it, including Tring (6.9 miles), Thame (8.4 miles) and Leighton Buzzard (9.6 miles), and the rest of Buckinghamshire.