Grantham, Lincolnshire
Two-storey rear extension in Grantham
We plan and build two-storey rear extensions for homeowners in Grantham. A larger kitchen downstairs and an extra bedroom or bathroom upstairs, under one roof. Start with a free site visit, then a written price once the design is agreed.
Grantham and its postcode districts NG31 are part of our Lincolnshire coverage. In Lincolnshire we check the neighbours' rear windows first, because the upper floor is where most two-storey schemes win or lose planning.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a two-storey rear extension cost in Grantham?
For Grantham we work from the East Midlands rate: £1,750–£2,620 per square metre of new floor, including VAT, standard specification. East Midlands prices sit a little below our West Midlands baseline.
| Size | Guide price inc VAT |
|---|---|
| 3 m × 5 m footprint, two floors (30 m²) | £52,500–£78,500 |
| 4 m × 6 m footprint, two floors (48 m²) | £84,000–£125,500 |
We put a fixed price in writing once the design is agreed, and explain any provisional sums such as foundations.
Do you need planning permission for a two-storey rear extension in Grantham?
Here is how the rules in England apply to a two-storey rear extension in Grantham.
A two-storey rear extension can be permitted development in England only if it projects no more than 3 metres, stays at least 7 metres from the rear boundary, matches the existing roof pitch and has obscure-glazed upper side windows. In practice most double-storey rear extensions go through a householder planning application.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. Before any drawing we look up the property's history with the council, because earlier extensions and removed rights change the answer.
What are homes in Grantham like to extend?
Grantham has plenty of inter-war semis and bungalows, and single-storey rear extensions suit both.
How a two-storey rear extension in Grantham comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Two-storey rear extensions near Grantham
We also build two-storey rear extensions in nearby Sleaford (11.4 miles) and Newark on Trent (13.0 miles).
- Two-storey rear extension in Sleaford
- Two-storey rear extension in Newark on Trent
- Two-storey rear extension in Melton Mowbray
- Two-storey rear extension in Bourne
- Two-storey rear extension in Oakham
Other work in Grantham:
FAQ
Two-storey rear extension questions in Grantham
Do you handle building control in Grantham?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
How long does a rear extension take to build in Grantham?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Can it be built on a terraced house?
Sometimes, but the upper floor is harder to get through planning on a terrace because of the effect on neighbours. A single-storey extension with a loft conversion is often an easier route.
Can I live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.
Can you match the brick or stone on my Grantham house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.