Local costs · North West · September 2026
How much does an extension cost in Oldham?
A mid-range 25 m² single-storey extension in Oldham costs about £59,000 to £72,500 including VAT, or £2,400 to £2,900 per m² at North West prices. Oldham’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, Oldham’s own building control charge and a 15% contingency, plan for £72,000 to £91,500.
Work out your project in Oldham
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Typical prices in Oldham
| Project | Building work | Budget to plan for |
|---|---|---|
| Single-storey extension, 25 m² | £59,000 to £72,500 | £72,000 to £91,500 |
| Double-storey extension, 40 m² | £85,000 to £107,000 | £102,000 to £133,000 |
| Dormer loft conversion, 30 m² | £43,500 to £54,000 | £54,000 to £69,500 |
| Kitchen, medium | £8,700 to £15,400 | £10,000 to £17,800 |
| Bathroom refit | £5,700 to £8,600 | £6,600 to £9,900 |
Building prices in the North West run about 7% below the UK average outside London. Kitchens and bathrooms vary less from place to place than extensions and lofts.
Building control fees in Oldham
| Work | Charge |
|---|---|
| Extension up to 10 m² (full plans) | £506 |
| Extension 10 to 40 m² (full plans) | £665 |
| Larger extension, 40 to 80 m² (full plans) | £861 |
| Extension 10 to 40 m² (building notice) | £730 |
| Loft conversion up to 40 m² | £712 |
| Garage conversion | Not published |
Oldham’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: Oldham’s building control charges. The charges apply from 1 April 2025. 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 Oldham compares with every council we checked.
Notes on Oldham’s schedule
Oldham publishes its charges on its own page. Extensions up to 10 m² have one charge. The loft figure is for a loft with a dormer; without one it is £531. We did not record a garage conversion 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 the North West
Building control for a 10 to 40 m² extension:
- Blackpool: £654.31
- Fylde: £660
- Bury: £713
- Wyre: £714
- Ribble Valley: £718
- Cheshire West and Chester: £736.32
- Pendle: £756
- Liverpool: £822
- Stockport: £1,050
Questions people ask
How much does an extension cost in Oldham?
A mid-range 25 m² single-storey extension in Oldham costs about £59,000 to £72,500 including VAT for the building work, or £2,400 to £2,900 per m², based on North West prices reviewed in September 2026. With a measured survey, design, a structural engineer, Oldham’s own building control charge and a 15% contingency, plan for £72,000 to £91,500.
How much is building control in Oldham?
Oldham’s own published charge for full plans approval of a 10 to 40 m² extension is £665 (including VAT). The charges apply from 1 April 2025.
How much does a loft conversion cost in Oldham?
A mid-range 30 m² dormer loft conversion in Oldham costs about £43,500 to £54,000 including VAT for the building work, and about £54,000 to £69,500 with fees, Oldham’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 Oldham? 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.