Local costs · East Midlands · September 2026
How much does an extension cost in Blaby?
A mid-range 25 m² single-storey extension in Blaby costs about £60,000 to £74,000 including VAT, or £2,400 to £3,000 per m² at East Midlands prices. Blaby charges £793 for building control on a 10 to 40 m² extension (full plans, including VAT): 6% below the typical council (£840). With design, a structural engineer, building control and a 15% contingency, budget £74,500 to £97,000.
Work out your project in Blaby
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Typical prices in Blaby
| Project | Building work | Budget to plan for |
|---|---|---|
| Single-storey extension, 25 m² | £60,000 to £74,000 | £74,500 to £97,000 |
| Double-storey extension, 40 m² | £86,500 to £109,000 | £107,000 to £140,000 |
| Dormer loft conversion, 30 m² | £53,500 to £66,000 | £67,000 to £86,000 |
| Kitchen, medium | £8,800 to £15,600 | £10,100 to £17,900 |
| Bathroom refit | £5,800 to £8,700 | £6,700 to £10,000 |
Building prices in East Midlands run about 5% below the UK average outside London. Kitchens and bathrooms vary less from place to place than extensions and lofts.
Building control fees in Blaby
| Work | Charge |
|---|---|
| Extension up to 10 m² (full plans) | £502 |
| Extension 10 to 40 m² (full plans) | £793 |
| Larger extension, 10-50 m² (50-100 m²: 889.96) (full plans) | £793 |
| Extension 10 to 40 m² (building notice) | £793 |
| Loft conversion up to 40 m² | £947 |
| Garage conversion | £518 |
Blaby charges £793 for building control on a 10 to 40 m² extension (full plans, including VAT): 6% below the typical council (£840). Source: Blaby's building control charges, 1 April 2026. Inc VAT ("all charges include VAT unless otherwise stated").
Private approved inspectors set their own prices and are often competitive, so it is worth asking one or two for a quote as well. See how Blaby compares with every council we checked.
Notes on Blaby's schedule
Shared schedule: Leicestershire Building Control Partnership (6 councils). Bands <=10 / 10-50 / 50-100 m2, so a 50 m2 extension is in the 10-50 band (50-100 m2 = 889.96). Loft figure is with dormers (without 808.58). Garage conversion up to 36 m2.
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.
Other councils in East Midlands
Building control for a 10 to 40 m² extension:
- Nottingham: £762
- Bassetlaw: £786
- Harborough: £793
- Hinckley and Bosworth: £793
- Melton: £793
- Oadby and Wigston: £793
- Rutland: £793
- Erewash: £882
Questions people ask
How much does an extension cost in Blaby?
A mid-range 25 m² single-storey extension in Blaby costs about £60,000 to £74,000 including VAT for the building work, or £2,400 to £3,000 per m², based on East Midlands prices reviewed in September 2026. With fees and a 15% contingency, budget £74,500 to £97,000.
How much is building control in Blaby?
Blaby charges £793 (including VAT) for a 10 to 40 m² extension (full plans), according to its published schedule (1 April 2026).
How much does a loft conversion cost in Blaby?
A mid-range 30 m² dormer loft conversion in Blaby costs about £53,500 to £66,000 including VAT for the building work, and about £67,000 to £86,000 with fees 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
- Trades: price an extension element by element with editable unit rates