Two-storey extensions in West Derby
Homeowners in West Derby can use us for the whole project or just the drawings and approvals. Start with a free visit.
West Derby at a glance
- Postcode districts
- L12
- Area
- Merseyside, England
- Price region
- North West England
- Nearest towns
- Norris Green (1 mile), Knotty Ash (1.3 miles), Croxteth (1.3 miles), Old Swan (1.3 miles)
- Distance to Liverpool
- about 3.2 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 district L12 in and around West Derby, along with neighbouring Norris Green, Knotty Ash and Croxteth.
Extensions available in West Derby
Two-storey rear extensions
West Derby guide price from £53,000, Standard spec.
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Two-storey side extensions
West Derby guide price from £82,000, Standard spec.
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Two-storey wraparound extensions
From £114,500 in West Derby. Free visit to firm it up.
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Part single, part two-storey extensions
From £68,500 in West Derby. Free visit to firm it up.
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Extensions over a garage
Design, approvals and build for West Derby homes. Guide from £30,000.
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First-floor extensions
West Derby guide price from £24,000, Standard spec.
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Two-storey extensions for semi-detached houses
Our North West England guide starts at £53,000 for this type.
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Two-storey extensions for detached houses
Guide from £82,000 in West Derby, including VAT.
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Kitchen extensions with bedrooms above
Guide from £53,000 (before kitchen units) in West Derby, including VAT.
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Extra bedroom and en-suite extensions
Design, approvals and build for West Derby homes. Guide from £53,000 (plus en-suite).
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 Merseyside
- 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 West Derby
West Derby 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 West Derby
Do you cover West Derby?
Yes. We cover West Derby (L12) and the surrounding area, including Norris Green and Knotty Ash. The first site visit is free.
What does a two-storey extension cost in West Derby?
Using our North West 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 £53,000–£72,000 including VAT. An extension over a garage is about £30,000–£43,500.
Which other places near West Derby do you cover?
Everywhere around it, including Norris Green (1 mile), Knotty Ash (1.3 miles) and Croxteth (1.3 miles), and the rest of Merseyside.