Local costs · Yorkshire and the Humber · September 2026
How much does an extension cost in Barnsley?
A mid-range 25 m² single-storey extension in Barnsley costs about £58,500 to £72,000 including VAT, or £2,300 to £2,900 per m² at Yorkshire and the Humber prices. Barnsley’s own published charge for building control on a 10 to 40 m² extension is £665 (full plans, including VAT): the 9th cheapest of the 91 councils we checked, 21% below the typical council (£840). With a measured survey, building regulations drawings, a structural engineer, Barnsley’s own building control charge and a 15% contingency, plan for £71,000 to £90,500.
Work out your project in Barnsley
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Typical prices in Barnsley
| Project | Building work | Budget to plan for |
|---|---|---|
| Single-storey extension, 25 m² | £58,500 to £72,000 | £71,000 to £90,500 |
| Double-storey extension, 40 m² | £84,000 to £106,000 | £101,000 to £131,000 |
| Dormer loft conversion, 30 m² | £43,000 to £53,500 | £53,000 to £69,000 |
| Kitchen, medium | £8,600 to £15,400 | £9,900 to £17,700 |
| Bathroom refit | £5,700 to £8,600 | £6,600 to £9,900 |
Building prices in Yorkshire and the Humber run about 8% below the UK average outside London. Kitchens and bathrooms vary less from place to place than extensions and lofts.
Building control fees in Barnsley
| Work | Charge |
|---|---|
| Extension up to 10 m² (full plans) | £465 |
| Extension 10 to 40 m² (full plans) | £665 |
| Larger extension, 40 to 60 m² (full plans) | £780 |
| Extension 10 to 40 m² (building notice) | £665 |
| Loft conversion up to 40 m² | £655 |
| Garage conversion | £390 |
Barnsley’s own published charge for building control on a 10 to 40 m² extension is £665 (full plans, including VAT): the 9th cheapest of the 91 councils we checked, 21% below the typical council (£840). Source: Barnsley’s building control charges. The charges apply from 6 April 2026. The charges include VAT.
Private building control firms (registered building control approvers) set their own prices and are often competitive, so it is worth asking one or two for a quote as well. See how Barnsley compares with every council we checked.
Notes on Barnsley’s schedule
Barnsley publishes its own schedule. The loft figure is for rooms in the roof space with a new staircase; without new access it is £530. A garage conversion has no inspection charge.
Planning
If your extension needs planning permission, a householder application in England costs £548. Many single-storey rear extensions are permitted development and need no application, and a lawful development certificate (£274) confirms it in writing.
Other councils in Yorkshire and the Humber
Building control for a 10 to 40 m² extension:
Questions people ask
How much does an extension cost in Barnsley?
A mid-range 25 m² single-storey extension in Barnsley costs about £58,500 to £72,000 including VAT for the building work, or £2,300 to £2,900 per m², based on Yorkshire and the Humber prices reviewed in September 2026. With a measured survey, design, a structural engineer, Barnsley’s own building control charge and a 15% contingency, plan for £71,000 to £90,500.
How much is building control in Barnsley?
Barnsley’s own published charge for full plans approval of a 10 to 40 m² extension is £665 (including VAT). The charges apply from 6 April 2026.
How much does a loft conversion cost in Barnsley?
A mid-range 30 m² dormer loft conversion in Barnsley costs about £43,000 to £53,500 including VAT for the building work, and about £53,000 to £69,000 with fees, Barnsley’s own building control charge and a 15% contingency.
Before you get quotes
- How to compare builders’ quotes line by line
- Plan your whole budget, including the costs people forget
- When quotes arrive, check each one against the typical range for your area
Work in Barnsley? Firm listings on Estiquote’s map of checked local firms open soon: see what you’ll need. Listing will be free while we build the map, with at least 30 days’ notice before any charge.