Two-storey extensions in Knotty Ash
From over-garage bedrooms to full wraparounds, we cover every kind of two-storey extension in Knotty Ash.
Knotty Ash at a glance
- Postcode districts
- L14 and L28
- Area
- Merseyside, England
- Price region
- North West England
- Nearest towns
- Old Swan (0.5 miles), West Derby (1.3 miles), Childwall (1.3 miles), Wavertree (1.5 miles)
- Distance to Liverpool
- about 3.4 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.
We cover postcode districts L14 and L28 in and around Knotty Ash, along with neighbouring Old Swan, West Derby and Childwall.
Extensions available in Knotty Ash
Two-storey rear extensions
Knotty Ash guide price from £53,000, Standard spec.
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Two-storey side extensions
Our North West England guide starts at £82,000 for this type.
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Two-storey wraparound extensions
Knotty Ash guide price from £114,500, Standard spec.
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Part single, part two-storey extensions
Knotty Ash guide price from £68,500, Standard spec.
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Extensions over a garage
Design, approvals and build for Knotty Ash homes. Guide from £30,000.
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First-floor extensions
Guide from £24,000 in Knotty Ash, including VAT.
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Two-storey extensions for semi-detached houses
For homes in Knotty Ash: typical guide from £53,000.
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Two-storey extensions for detached houses
Design, approvals and build for Knotty Ash homes. Guide from £82,000.
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Kitchen extensions with bedrooms above
Guide from £53,000 (before kitchen units) in Knotty Ash, including VAT.
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Extra bedroom and en-suite extensions
Design, approvals and build for Knotty Ash 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 Knotty Ash
Knotty Ash 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 Knotty Ash
Do you cover Knotty Ash?
Yes. We cover Knotty Ash (L14 and L28) and the surrounding area, including Old Swan and West Derby. The first site visit is free.
What does a two-storey extension cost in Knotty Ash?
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 Knotty Ash do you cover?
Everywhere around it, including Old Swan (0.5 miles), West Derby (1.3 miles) and Childwall (1.3 miles), and the rest of Merseyside.