Birmingham · West Midlands · 2026 Prices

How much does a house extension cost in Birmingham?

The average cost of a house extension in Birmingham ranges from £18,000 to £72,000, with most homeowners paying around £36,000. Prices include VAT.

House Extension cost summary — Birmingham

Budget

£18,000

Average

£36,000

Premium

£72,000

Typical timeframe: 10-20 weeks. Prices are estimates for Birmingham and may vary.

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What affects the cost of a house extension in Birmingham?

1

Single or double storey

2

Size (sq m)

3

Foundation type

4

Roof type

5

Windows and doors

6

Internal finishing

Related costs in Birmingham

Kitchen Extension

£13,500 – £49,500

Loft Conversion

£18,000 – £58,500

Garage Conversion

£7,200 – £22,500

New Build House

£135,000 – £450,000

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