Two-storey extensions in Alnwick
Everything for a two-storey extension in Alnwick, in one place: types, guide prices for North East England, the approval rules in England and how to get started.
Alnwick at a glance
- Postcode districts
- NE66 and NE67
- Area
- Northumberland, England
- Price region
- North East England
- Nearest towns
- Amble (7.3 miles), Hadston (9.1 miles), Pegswood (16.3 miles), Morpeth (16.9 miles)
- Distance to Blyth
- about 21.2 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.
Around Alnwick we also work in Amble, Hadston and Pegswood, and across the rest of Northumberland. Postcode districts in and near Alnwick: NE66 and NE67.
Extensions available in Alnwick
Two-storey rear extensions
From £50,500 in Alnwick. Free visit to firm it up.
Learn more
Two-storey side extensions
Alnwick guide price from £77,500, Standard spec.
Learn more
Two-storey wraparound extensions
Guide from £108,500 in Alnwick, including VAT.
Learn more
Part single, part two-storey extensions
From £65,000 in Alnwick. Free visit to firm it up.
Learn more
Extensions over a garage
From £28,500 in Alnwick. Free visit to firm it up.
Learn more
First-floor extensions
For homes in Alnwick: typical guide from £22,500.
Learn more
Two-storey extensions for semi-detached houses
From £50,500 in Alnwick. Free visit to firm it up.
Learn more
Two-storey extensions for detached houses
Design, approvals and build for Alnwick homes. Guide from £77,500.
Learn more
Kitchen extensions with bedrooms above
For homes in Alnwick: typical guide from £50,500 (before kitchen units).
Learn more
Extra bedroom and en-suite extensions
For homes in Alnwick: typical guide from £50,500 (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 Northumberland, one or two of these will clearly suit the plot better than the rest, and we'll tell you which.
Also available in Northumberland
- 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 Alnwick
Alnwick 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 Alnwick
Do you cover Alnwick?
Yes. We cover Alnwick (NE66 and NE67) and the surrounding area, including Amble and Hadston. The first site visit is free.
What does a two-storey extension cost in Alnwick?
Using our North 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 £50,500–£68,000 including VAT. An extension over a garage is about £28,500–£41,500.
Which other places near Alnwick do you cover?
Everywhere around it, including Amble (7.3 miles), Hadston (9.1 miles) and Pegswood (16.3 miles), and the rest of Northumberland.