Estiquote

Local costs · West Midlands · September 2026

How much does an extension cost in Sandwell?

A mid-range 25 m² single-storey extension in Sandwell costs about £61,000 to £75,500 including VAT, or £2,400 to £3,000 per m² at West Midlands prices. Sandwell charges £704 for building control on a 10 to 40 m² extension (full plans, including VAT): the 16th cheapest of the 91 councils we checked, 16% below the typical council (£840). With design, a structural engineer, building control and a 15% contingency, budget £76,000 to £98,500.

By Estiquote · Prices reviewed · Council fees from Sandwell's published schedule · How we calculate

Work out your project in Sandwell

Loading the calculator…

Typical prices in Sandwell

Mid-range finish, West Midlands prices, including VAT. The budget adds design and engineering fees, Sandwell's building control charge and a 15% contingency.
ProjectBuilding workBudget to plan for
Single-storey extension, 25 m²£61,000 to £75,500£76,000 to £98,500
Double-storey extension, 40 m²£88,500 to £112,000£109,000 to £143,000
Dormer loft conversion, 30 m²£54,500 to £67,500£68,000 to £87,500
Kitchen, medium£8,900 to £15,800£10,200 to £18,100
Bathroom refit£5,900 to £8,800£6,800 to £10,200

Building prices in West Midlands run about 3% below the UK average outside London. Kitchens and bathrooms vary less from place to place than extensions and lofts.

Building control fees in Sandwell

Sandwell council charges including VAT (plan and inspection combined)
WorkCharge
Extension up to 10 m² (full plans)£516
Extension 10 to 40 m² (full plans)£704
Larger extension, 40-100 m² (full plans)£939
Extension 10 to 40 m² (building notice)£845
Loft conversion up to 40 m²£657
Garage conversion£422

Sandwell charges £704 for building control on a 10 to 40 m² extension (full plans, including VAT): the 16th cheapest of the 91 councils we checked, 16% below the typical council (£840). Source: Sandwell's building control charges, 1 April 2026. Inc VAT ("Value added tax at the current standard rate is included").

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 Sandwell compares with every council we checked.

Notes on Sandwell's schedule

Own schedule. Loft up to 50 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 West Midlands

Building control for a 10 to 40 m² extension:

Questions people ask

How much does an extension cost in Sandwell?

A mid-range 25 m² single-storey extension in Sandwell costs about £61,000 to £75,500 including VAT for the building work, or £2,400 to £3,000 per m², based on West Midlands prices reviewed in September 2026. With fees and a 15% contingency, budget £76,000 to £98,500.

How much is building control in Sandwell?

Sandwell charges £704 (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 Sandwell?

A mid-range 30 m² dormer loft conversion in Sandwell costs about £54,500 to £67,500 including VAT for the building work, and about £68,000 to £87,500 with fees and a 15% contingency.

Before you get quotes