Two-storey extensions in Allerton
Homeowners in Allerton can use us for the whole project or just the drawings and approvals. Start with a free visit.
Allerton at a glance
- Postcode districts
- L19
- Area
- Merseyside, England
- Price region
- North West England
- Nearest towns
- Mossley Hill (1 mile), Woolton (1.1 miles), Hunts Cross (1.4 miles), Childwall (2.1 miles)
- Distance to Liverpool
- about 4.6 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 Allerton (L19) and the places around it, including Mossley Hill (1.0 miles), Woolton (1.1 miles) and Hunts Cross.
Extensions available in Allerton
Two-storey rear extensions
Allerton guide price from £53,000, Standard spec.
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Two-storey side extensions
From £82,000 in Allerton. Free visit to firm it up.
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Two-storey wraparound extensions
Our North West England guide starts at £114,500 for this type.
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Part single, part two-storey extensions
For homes in Allerton: typical guide from £68,500.
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Extensions over a garage
For homes in Allerton: typical guide from £30,000.
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First-floor extensions
Design, approvals and build for Allerton homes. Guide from £24,000.
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Two-storey extensions for semi-detached houses
Guide from £53,000 in Allerton, including VAT.
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Two-storey extensions for detached houses
Design, approvals and build for Allerton homes. Guide from £82,000.
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Kitchen extensions with bedrooms above
From £53,000 (before kitchen units) in Allerton. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Allerton guide price from £53,000 (plus en-suite), Standard spec.
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 Allerton, with a rough idea of the approval route and cost for each.
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 Allerton
Allerton 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 Allerton
Do you cover Allerton?
Yes. We cover Allerton (L19) and the surrounding area, including Mossley Hill and Woolton. The first site visit is free.
What does a two-storey extension cost in Allerton?
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 Allerton do you cover?
Everywhere around it, including Mossley Hill (1 mile), Woolton (1.1 miles) and Hunts Cross (1.4 miles), and the rest of Merseyside.