Estiquote

Local costs · North West · September 2026

How much does an extension cost in Cheshire West and Chester?

A mid-range 25 m² single-storey extension in Cheshire West and Chester costs about £58,500 to £72,500 including VAT, or £2,300 to £2,900 per m² at North West prices. Cheshire West and Chester charges £736 for building control on a 10 to 40 m² extension (full plans, including VAT): 12% below the typical council (£840). With design, a structural engineer, building control and a 15% contingency, budget £73,000 to £95,000.

By Estiquote · Prices reviewed · Council fees from Cheshire West and Chester's published schedule · How we calculate

Work out your project in Cheshire West and Chester

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Typical prices in Cheshire West and Chester

Mid-range finish, North West prices, including VAT. The budget adds design and engineering fees, Cheshire West and Chester's building control charge and a 15% contingency.
ProjectBuilding workBudget to plan for
Single-storey extension, 25 m²£58,500 to £72,500£73,000 to £95,000
Double-storey extension, 40 m²£85,000 to £107,000£105,000 to £137,000
Dormer loft conversion, 30 m²£52,500 to £64,500£65,500 to £84,000
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 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 Cheshire West and Chester

Cheshire West and Chester council charges including VAT (plan and inspection combined)
WorkCharge
Extension up to 10 m² (full plans)£627
Extension 10 to 40 m² (full plans)£736
Larger extension, 40-100 m² (full plans)£904
Extension 10 to 40 m² (building notice)£847
Loft conversion up to 40 m²£752
Garage conversion£486

Cheshire West and Chester charges £736 for building control on a 10 to 40 m² extension (full plans, including VAT): 12% below the typical council (£840). Source: Cheshire West and Chester's building control charges, 1 April 2026. Plan + inspection, inc VAT totals.

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 Cheshire West and Chester compares with every council we checked.

Notes on Cheshire West and Chester's schedule

Own schedule. Loft figure is with dormer (without 652.54).

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 North West

Building control for a 10 to 40 m² extension:

Questions people ask

How much does an extension cost in Cheshire West and Chester?

A mid-range 25 m² single-storey extension in Cheshire West and Chester costs about £58,500 to £72,500 including VAT for the building work, or £2,300 to £2,900 per m², based on North West prices reviewed in September 2026. With fees and a 15% contingency, budget £73,000 to £95,000.

How much is building control in Cheshire West and Chester?

Cheshire West and Chester charges £736 (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 Cheshire West and Chester?

A mid-range 30 m² dormer loft conversion in Cheshire West and Chester costs about £52,500 to £64,500 including VAT for the building work, and about £65,500 to £84,000 with fees and a 15% contingency.

Before you get quotes