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 Boston?
In Boston, 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 Boston 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 |
What moves the price most:
- Condition of the existing structure
- Access to the site
- 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 Boston?
The approval route for Boston is set by planning law in 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.
We check this for your address before design work starts, so there are no surprises later.
What we handle
What we take care of:
- Insulation that respects the existing fabric
- Ecology and bat survey coordination
- Planning or prior approval application
- Services, drainage and septic or treatment plant
- Structural repairs and new floor slab
- Structural survey and feasibility
How long does it take?
Build time is typically 6 to 12 months on site depending on condition. Before that, surveys, drawings and approvals usually take 4 to 9 months, longer if the council asks for changes.
Building in Boston
In the East Midlands, many estates built since the 1960s have integral garages that convert well into a study or bedroom.
We work across Boston and neighbouring areas such as Spalding, Skegness and Wisbech. Postcodes we cover in Boston include PE21.
How it works
- 01
Survey and brief
We visit, discuss your ideas and budget, and survey the property or site at no cost.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Build and sign-off
We run the build to a written programme and hand over the completion certificate.
Questions about barn conversions in Boston
How long does a barn conversion take?
Typically 6 to 12 months on site, depending on the building’s condition.
How much does a barn conversion cost in Boston?
In Boston, 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.
Can I get a mortgage for a barn conversion?
Specialist self-build and conversion mortgages release money in stages. We can provide the staged costings lenders ask for.
Do you build barn conversions in Boston?
Yes. We build barn conversions across Boston, including postcodes PE21. Every project starts with a free home visit.
Do I need a bat survey?
Very often. Barns are common bat roosts, and planning authorities usually ask for an ecology survey.