Two-storey extensions in Lincolnshire
We cover all of Lincolnshire for two-storey and first-floor extensions. Pick a town or an extension type below.
Lincolnshire at a glance
- Nation
- England
- Price region
- East Midlands
- Postcode areas
- DN, LN, NG, PE
- Main town
- Lincoln
- Towns listed
- 17
- Site visits
- Free, no obligation
Choose your town
- Lincoln
- Grimsby
- Scunthorpe
- Boston
- Grantham
- Cleethorpes
- Spalding
- Skegness
- Stamford
- Gainsborough
- Louth
- Sleaford
- Bourne
- Market Deeping
- Mablethorpe
- Barton-upon-Humber
- Immingham
Guide prices in the East Midlands
| Extension type | Per m² | Typical project |
|---|---|---|
| Two-storey rear extension | £1,960–£2,650 per m² | £55,000–£74,000 |
| Two-storey side extension | £2,010–£2,700 per m² | £84,500–£113,000 |
| Two-storey wraparound extension | £2,110–£2,890 per m² | £118,000–£162,000 |
| Part single, part two-storey | £1,960–£2,700 per m² | £70,500–£97,000 |
| Extension over a garage | £1,720–£2,500 per m² | £31,000–£45,000 |
| First-floor extension over an existing single storey | £1,760–£2,550 per m² | £24,500–£35,500 |
| Two-storey front extension | £2,160–£2,940 per m² | £26,000–£35,500 |
Including VAT, Standard spec. See all prices and fees.
Across Lincolnshire we cover Lincoln (LN1), Grimsby (DN31), Scunthorpe (DN15), Boston (PE20), Grantham (NG31), Cleethorpes (DN35), Spalding (PE11) and Skegness (PE24), plus the smaller places around them.
Which 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.
The rules in England
Lincolnshire 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
Extension types
- Two-storey rear extensions
- Two-storey side extensions
- Two-storey wraparound extensions
- Part single, part two-storey extensions
- Extensions over a garage
- First-floor extensions
- Two-storey front extensions
By house type
- Two-storey extensions for semi-detached houses
- Two-storey extensions for detached houses
- Two-storey extensions for end-of-terrace houses
Rooms and uses
- Kitchen extensions with bedrooms above
- Extra bedroom and en-suite extensions
- Two-storey annexe extensions
- Garage conversions with a room above
Design and approvals
- 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
Questions about extensions in Lincolnshire
How much does a two-storey extension cost in Lincolnshire?
In the East Midlands our guide for a two-storey rear extension is £1,960–£2,650 per m² including VAT, about £55,000–£74,000 for a 4 m × 3.5 m footprint on two floors (28 m² of new floor space). Side and wraparound extensions cost a little more per m².
Do I need planning permission in Lincolnshire?
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).
Do you cover the whole of Lincolnshire?
Yes. We list the main towns here, but we cover the whole of Lincolnshire including villages. The first site visit is free.
What happens at the first visit?
We look at your house, the boundaries, access and drains, talk through what you need and explain the approvals. Then we price the design stage, including the measured survey, in writing.