Two-storey extensions in Gainsborough
We design, get approval for and build two-storey extensions in Gainsborough and the surrounding area. Choose the type of extension below or book a free site visit.
Gainsborough at a glance
- Postcode districts
- DN21
- Area
- Lincolnshire, England
- Price region
- East Midlands
- Nearest towns
- Retford (8.4 miles), Scunthorpe (14.3 miles), Lincoln (14.4 miles), Boughton (15.5 miles)
- Distance to Lincoln
- about 14.4 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 Gainsborough (DN21) and the places around it, including Retford (8.4 miles), Scunthorpe (14.3 miles) and Lincoln.
Extensions available in Gainsborough
Two-storey rear extensions
For homes in Gainsborough: typical guide from £55,000.
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Two-storey side extensions
From £84,500 in Gainsborough. Free visit to firm it up.
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Two-storey wraparound extensions
For homes in Gainsborough: typical guide from £118,000.
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Part single, part two-storey extensions
From £70,500 in Gainsborough. Free visit to firm it up.
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Extensions over a garage
Guide from £31,000 in Gainsborough, including VAT.
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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
Guide from £55,000 in Gainsborough, including VAT.
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Two-storey extensions for detached houses
Our East Midlands guide starts at £84,500 for this type.
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Kitchen extensions with bedrooms above
For homes in Gainsborough: typical guide from £55,000 (before kitchen units).
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Extra bedroom and en-suite extensions
From £55,000 (plus en-suite) in Gainsborough. Free visit to firm it up.
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 Lincolnshire
- 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 Gainsborough
Gainsborough 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 Gainsborough
Do you cover Gainsborough?
Yes. We cover Gainsborough (DN21) and the surrounding area, including Retford and Scunthorpe. The first site visit is free.
What does a two-storey extension cost in Gainsborough?
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 Gainsborough do you cover?
Everywhere around it, including Retford (8.4 miles), Scunthorpe (14.3 miles) and Lincoln (14.4 miles), and the rest of Lincolnshire.