Two-storey extensions in Northallerton
Planning a bigger home in Northallerton? Compare extension types and guide prices below, then book a free site visit.
Northallerton at a glance
- Postcode districts
- DL6 and DL7
- Area
- North Yorkshire, England
- Price region
- Yorkshire and the Humber
- Nearest towns
- Thirsk (8.1 miles), Yarm (11.8 miles), Catterick Garrison (12 miles), Darlington (13.7 miles)
- Distance to York
- about 29.9 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.
Northallerton sits about 29.9 miles from York. Closer to home, Thirsk is 8.1 miles away and Yarm 11.8 miles.
Extensions available in Northallerton
Two-storey rear extensions
For homes in Northallerton: typical guide from £51,500.
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Two-storey side extensions
Guide from £79,000 in Northallerton, including VAT.
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Two-storey wraparound extensions
For homes in Northallerton: typical guide from £111,000.
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Part single, part two-storey extensions
Our Yorkshire and the Humber guide starts at £66,000 for this type.
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Extensions over a garage
Our Yorkshire and the Humber guide starts at £29,000 for this type.
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First-floor extensions
Northallerton guide price from £23,000, Standard spec.
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Two-storey extensions for semi-detached houses
Guide from £51,500 in Northallerton, including VAT.
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Two-storey extensions for detached houses
For homes in Northallerton: typical guide from £79,000.
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Kitchen extensions with bedrooms above
For homes in Northallerton: typical guide from £51,500 (before kitchen units).
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Extra bedroom and en-suite extensions
For homes in Northallerton: typical guide from £51,500 (plus en-suite).
Learn moreWhich type suits your house?
Start with what you need the space for. Bedrooms and an en-suite upstairs with a bigger kitchen below is the classic two-storey brief, but in Northallerton we also design annexes, home offices and bedrooms over garages.
Also available in North Yorkshire
- 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 Northallerton
Northallerton 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 Northallerton
Do you cover Northallerton?
Yes. We cover Northallerton (DL6 and DL7) and the surrounding area, including Thirsk and Yarm. The first site visit is free.
What does a two-storey extension cost in Northallerton?
Using our Yorkshire and the Humber 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 £51,500–£69,500 including VAT. An extension over a garage is about £29,000–£42,000.
Which other places near Northallerton do you cover?
Everywhere around it, including Thirsk (8.1 miles), Yarm (11.8 miles) and Catterick Garrison (12 miles), and the rest of North Yorkshire.