Two-storey extensions in Corby
Planning a bigger home in Corby? Compare extension types and guide prices below, then book a free site visit.
Corby at a glance
- Postcode districts
- NN17 and NN18
- Area
- Northamptonshire, England
- Price region
- East Midlands
- Nearest towns
- Uppingham (6.5 miles), Desborough (6.7 miles), Kettering (6.9 miles), North Luffenham (9.1 miles)
- Distance to Northampton
- about 18.9 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.
Corby sits about 18.9 miles from Northampton. Closer to home, Uppingham is 6.5 miles away and Desborough 6.7 miles.
Extensions available in Corby
Two-storey rear extensions
Design, approvals and build for Corby homes. Guide from £55,000.
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Two-storey side extensions
From £84,500 in Corby. Free visit to firm it up.
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Two-storey wraparound extensions
From £118,000 in Corby. Free visit to firm it up.
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Part single, part two-storey extensions
Corby guide price from £70,500, Standard spec.
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Extensions over a garage
From £31,000 in Corby. Free visit to firm it up.
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First-floor extensions
Our East Midlands guide starts at £24,500 for this type.
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Two-storey extensions for semi-detached houses
Our East Midlands guide starts at £55,000 for this type.
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Two-storey extensions for detached houses
Design, approvals and build for Corby homes. Guide from £84,500.
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Kitchen extensions with bedrooms above
Guide from £55,000 (before kitchen units) in Corby, including VAT.
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Extra bedroom and en-suite extensions
For homes in Corby: typical guide from £55,000 (plus en-suite).
Learn moreWhich type suits your house?
The boundaries usually decide it. Two-storey work close to a neighbour needs careful design for light and privacy, so at the visit in Corby we measure distances to every boundary before suggesting a type.
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 Corby
Corby 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 Corby
Do you cover Corby?
Yes. We cover Corby (NN17 and NN18) and the surrounding area, including Uppingham and Desborough. The first site visit is free.
What does a two-storey extension cost in Corby?
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 Corby do you cover?
Everywhere around it, including Uppingham (6.5 miles), Desborough (6.7 miles) and Kettering (6.9 miles), and the rest of Northamptonshire.