What is a barn conversion?
A barn conversion turns an agricultural or rural building into a home while keeping its character: the brick or stone walls, roof timbers and large openings. It involves structural repair, insulation, new services and often a new floor slab.
How much does a barn conversion cost in Grantham?
In Grantham, a barn conversion typically costs £1,700–£2,850 per m² of floor area, including VAT at usually 5% (reduced rate for creating a new dwelling). For a typical 150 m² project that is roughly £255,000–£427,500. Building costs in the East Midlands run about 5% below the UK average, and the figures for Grantham are adjusted to reflect that. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| Smaller project (105 m²) | £178,500–£299,000 |
| Typical project (150 m²) | £255,000–£427,500 |
| Larger project (210 m²) | £357,000–£598,500 |
| Rate per m² | £1,700–£2,850 |
The biggest cost drivers are:
- Insulation approach
- Condition of the existing structure
- Services and drainage
- Planning conditions and ecology
Your exact price depends on the survey and drawings. The guide price tool gives a quick range in the meantime.
Do you need planning permission for a barn conversion in Grantham?
Approvals for a barn conversion in Grantham follow the rules for England. In England converting an agricultural building into a home needs either full planning permission or prior approval under Class Q of the permitted development rules, which limits floor space and the number of homes. Listed barns also need listed building consent.
Building regulations approval comes from the council’s building control service or a registered building control approver. The work is inspected at key stages, such as foundations, drainage and insulation, and a completion certificate is issued at the end.
If the answer is not clear-cut, we can apply for formal confirmation before you commit to the build.
What we handle
What we take care of:
- Services, drainage and septic or treatment plant
- Ecology and bat survey coordination
- Structural survey and feasibility
- Building control completion
- New roof covering where needed
- Structural repairs and new floor slab
How long does it take?
Expect 6 to 12 months on site depending on condition. Allow time beforehand for drawings and approvals, usually 4 to 9 months.
Building in Grantham
In the East Midlands, many estates built since the 1960s have integral garages that convert well into a study or bedroom.
Grantham sits in Lincolnshire, about 22 miles south of Lincoln. We cover the whole of Grantham, including postcodes NG31.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 02
Drawings and written quote
We prepare the design and give you a written, itemised quote with inclusions and exclusions.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Build and handover
Work follows the agreed programme, with inspections along the way and a completion certificate at the end.
Questions about barn conversions in Grantham
Do you build barn conversions in Grantham?
Yes. We build barn conversions across Grantham, including postcodes NG31. Every project starts with a free home visit.
Do I need planning permission for a barn conversion?
Yes. A barn conversion needs planning permission or, in England only, prior approval under the agricultural permitted development rules where the building qualifies. Listed barns also need listed building consent.
How much does a barn conversion cost in Grantham?
In Grantham, a barn conversion typically costs £1,700–£2,850 per m² of floor area, including VAT at usually 5% (reduced rate for creating a new dwelling). A typical 150 m² project comes to roughly £255,000–£427,500. Your fixed price depends on the survey and drawings.
Is VAT reduced on a barn conversion?
Usually yes. Converting a non-residential building into a dwelling normally qualifies for the reduced 5% VAT rate on building work. Our guide prices assume this rate.
What about drainage without mains sewer?
A sewage treatment plant can be installed, subject to the environmental regulator’s rules where you live.