Two-storey extensions in Grantham
We design, get approval for and build two-storey extensions in Grantham and the surrounding area. Choose the type of extension below or book a free site visit.
Grantham at a glance
- Postcode districts
- NG31, NG32 and NG33
- Area
- Lincolnshire, England
- Price region
- East Midlands
- Nearest towns
- Sleaford (11.4 miles), Newark-on-Trent (13 miles), Greetham (13.2 miles), Cottesmore (13.7 miles)
- Distance to Lincoln
- about 22.2 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.
We cover Grantham (NG31, NG32 and NG33) and the places around it, including Sleaford (11.4 miles), Newark-on-Trent (13.0 miles) and Greetham.
Extensions available in Grantham
Two-storey rear extensions
Design, approvals and build for Grantham homes. Guide from £55,000.
Learn more
Two-storey side extensions
From £84,500 in Grantham. Free visit to firm it up.
Learn more
Two-storey wraparound extensions
Our East Midlands guide starts at £118,000 for this type.
Learn more
Part single, part two-storey extensions
Grantham guide price from £70,500, Standard spec.
Learn more
Extensions over a garage
Grantham guide price from £31,000, Standard spec.
Learn more
First-floor extensions
Grantham guide price from £24,500, Standard spec.
Learn more
Two-storey extensions for semi-detached houses
For homes in Grantham: typical guide from £55,000.
Learn more
Two-storey extensions for detached houses
For homes in Grantham: typical guide from £84,500.
Learn more
Kitchen extensions with bedrooms above
Our East Midlands guide starts at £55,000 (before kitchen units) for this type.
Learn more
Extra bedroom and en-suite extensions
Design, approvals and build for Grantham homes. Guide from £55,000 (plus en-suite).
Learn moreWhich type suits your house?
Which type suits your house in Grantham depends mostly on where you have room. A deep garden points to a rear extension; space beside the house points to a side or over-garage extension; a house that already has a single-storey extension can often take a first floor on top.
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 Grantham
Grantham 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 Grantham
Do you cover Grantham?
Yes. We cover Grantham (NG31, NG32 and NG33) and the surrounding area, including Sleaford and Newark-on-Trent. The first site visit is free.
What does a two-storey extension cost in Grantham?
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 Grantham do you cover?
Everywhere around it, including Sleaford (11.4 miles), Newark-on-Trent (13 miles) and Greetham (13.2 miles), and the rest of Lincolnshire.