Two-storey extensions in Milton Keynes
Everything for a two-storey extension in Milton Keynes, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Milton Keynes at a glance
- Postcode districts
- MK5, MK6, MK8, MK9, MK10, MK11 and nearby districts
- Area
- Buckinghamshire, England
- Price region
- South East England
- Nearest towns
- Newport Pagnell (3.5 miles), Bletchley (3.5 miles), Leighton Buzzard (9.6 miles), Buckingham (10.3 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 Milton Keynes (MK5, MK6, MK8, MK9, MK10, MK11 and nearby districts) and the places around it, including Newport Pagnell (3.5 miles), Bletchley (3.5 miles) and Leighton Buzzard.
Extensions available in Milton Keynes
Two-storey rear extensions
Design, approvals and build for Milton Keynes homes. Guide from £61,500.
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Two-storey side extensions
For homes in Milton Keynes: typical guide from £94,500.
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Two-storey wraparound extensions
For homes in Milton Keynes: typical guide from £132,500.
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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 Milton Keynes: typical guide from £34,500.
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First-floor extensions
From £27,500 in Milton Keynes. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
From £61,500 in Milton Keynes. Free visit to firm it up.
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Two-storey extensions for detached houses
Design, approvals and build for Milton Keynes homes. Guide from £94,500.
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Kitchen extensions with bedrooms above
Milton Keynes guide price from £61,500 (before kitchen units), Standard spec.
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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 Milton Keynes
Milton Keynes 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 Milton Keynes
Do you cover Milton Keynes?
Yes. We cover Milton Keynes (MK5, MK6, MK8, MK9, MK10, MK11 and nearby districts) and the surrounding area, including Newport Pagnell and Bletchley. The first site visit is free.
What does a two-storey extension cost in Milton Keynes?
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 Milton Keynes do you cover?
Everywhere around it, including Newport Pagnell (3.5 miles), Bletchley (3.5 miles) and Leighton Buzzard (9.6 miles), and the rest of Buckinghamshire.