Two-storey extensions in Welling
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Welling.
Welling at a glance
- Postcode districts
- DA16
- Area
- Greater London, England
- Price region
- London
- Nearest towns
- Abbey Wood (1.7 miles), Plumstead (1.8 miles), Bexley (2.3 miles), Sidcup (2.5 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 Welling we also work in Abbey Wood, Plumstead and Bexley, and across the rest of Greater London. Postcode district in and near Welling: DA16.
Extensions available in Welling
Two-storey rear extensions
Design, approvals and build for Welling homes. Guide from £67,000.
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Two-storey side extensions
Our London guide starts at £103,500 for this type.
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Two-storey wraparound extensions
Our London guide starts at £144,500 for this type.
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Part single, part two-storey extensions
From £86,500 in Welling. Free visit to firm it up.
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Extensions over a garage
Our London guide starts at £38,000 for this type.
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First-floor extensions
Design, approvals and build for Welling homes. Guide from £30,000.
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Two-storey extensions for semi-detached houses
Our London guide starts at £67,000 for this type.
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Two-storey extensions for detached houses
Design, approvals and build for Welling homes. Guide from £103,500.
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Kitchen extensions with bedrooms above
From £67,000 (before kitchen units) in Welling. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Our London guide starts at £67,000 (plus en-suite) for this type.
Learn moreWhich type suits your house?
Which type suits your house in Welling depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
Also available in Greater London
- 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 Welling
Welling 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 Welling
Do you cover Welling?
Yes. We cover Welling (DA16) and the surrounding area, including Abbey Wood and Plumstead. The first site visit is free.
What does a two-storey extension cost in Welling?
Using our London 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 £67,000–£90,500 including VAT. An extension over a garage is about £38,000–£55,000.
Which other places near Welling do you cover?
Everywhere around it, including Abbey Wood (1.7 miles), Plumstead (1.8 miles) and Bexley (2.3 miles), and the rest of Greater London.