Two-storey extensions in Northampton
Planning a bigger home in Northampton? Compare extension types and guide prices below, then book a free site visit.
Northampton at a glance
- Postcode districts
- NN1, NN2, NN3, NN4, NN5, NN6 and nearby districts
- Area
- Northamptonshire, England
- Price region
- East Midlands
- Nearest towns
- Wellingborough (8.8 miles), Daventry (11.7 miles), Rushden (12.2 miles), Kettering (12.2 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 Northampton we also work in Wellingborough, Daventry and Rushden, and across the rest of Northamptonshire. Postcode districts in and near Northampton: NN1, NN2, NN3, NN4, NN5, NN6 and nearby districts.
Extensions available in Northampton
Two-storey rear extensions
For homes in Northampton: typical guide from £55,000.
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Two-storey side extensions
Northampton guide price from £84,500, Standard spec.
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Two-storey wraparound extensions
Guide from £118,000 in Northampton, including VAT.
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Part single, part two-storey extensions
Design, approvals and build for Northampton homes. Guide from £70,500.
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Extensions over a garage
Our East Midlands guide starts at £31,000 for this type.
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First-floor extensions
From £24,500 in Northampton. Free visit to firm it up.
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Two-storey extensions for semi-detached houses
For homes in Northampton: typical guide from £55,000.
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Two-storey extensions for detached houses
From £84,500 in Northampton. Free visit to firm it up.
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Kitchen extensions with bedrooms above
From £55,000 (before kitchen units) in Northampton. Free visit to firm it up.
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Extra bedroom and en-suite extensions
Design, approvals and build for Northampton homes. Guide from £55,000 (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 Northampton we also design annexes, home offices and bedrooms over garages.
Also available in Northamptonshire
- 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 Northampton
Northampton 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 Northampton
Do you cover Northampton?
Yes. We cover Northampton (NN1, NN2, NN3, NN4, NN5, NN6 and nearby districts) and the surrounding area, including Wellingborough and Daventry. The first site visit is free.
What does a two-storey extension cost in Northampton?
Using our East Midlands 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 £55,000–£74,000 including VAT. An extension over a garage is about £31,000–£45,000.
Which other places near Northampton do you cover?
Everywhere around it, including Wellingborough (8.8 miles), Daventry (11.7 miles) and Rushden (12.2 miles), and the rest of Northamptonshire.