Two-storey extensions in Hartley
Everything for a two-storey extension in Hartley, in one place: types, guide prices for South East England, the approval rules in England and how to get started.
Hartley at a glance
- Postcode districts
- DA3 and DA13
- Area
- Kent, England
- Price region
- South East England
- Nearest towns
- Longfield (0.7 miles), Swanscombe (4.2 miles), Gravesend (4.8 miles), Dartford (5.7 miles)
- Distance to Maidstone
- about 12.4 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 Hartley we also work in Longfield, Swanscombe and Gravesend, and across the rest of Kent. Postcode districts in and near Hartley: DA3 and DA13.
Extensions available in Hartley
Two-storey rear extensions
Our South East England guide starts at £61,500 for this type.
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Two-storey side extensions
Hartley guide price from £94,500, Standard spec.
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Two-storey wraparound extensions
For homes in Hartley: typical guide from £132,500.
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Part single, part two-storey extensions
Design, approvals and build for Hartley homes. Guide from £79,000.
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Extensions over a garage
From £34,500 in Hartley. Free visit to firm it up.
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First-floor extensions
Hartley guide price from £27,500, Standard spec.
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Two-storey extensions for semi-detached houses
Design, approvals and build for Hartley homes. Guide from £61,500.
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Two-storey extensions for detached houses
For homes in Hartley: typical guide from £94,500.
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Kitchen extensions with bedrooms above
Guide from £61,500 (before kitchen units) in Hartley, including VAT.
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Extra bedroom and en-suite extensions
Design, approvals and build for Hartley homes. Guide from £61,500 (plus en-suite).
Learn moreWhich type suits your house?
Rear, side, wraparound or over the garage: each adds space in a different way. For most houses in Kent, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in Kent
- 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 Hartley
Hartley 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 Hartley
Do you cover Hartley?
Yes. We cover Hartley (DA3 and DA13) and the surrounding area, including Longfield and Swanscombe. The first site visit is free.
What does a two-storey extension cost in Hartley?
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 Hartley do you cover?
Everywhere around it, including Longfield (0.7 miles), Swanscombe (4.2 miles) and Gravesend (4.8 miles), and the rest of Kent.