How Much Does a House Extension Cost in the West Midlands?

A house extension is one of the biggest home improvements you can make, so the first question is almost always the same: what will it cost? The honest answer is that it depends — but there are reliable benchmarks to plan around.

As a rough guide for 2026, a standard single-storey extension in the West Midlands costs in the region of £1,800–£3,000 per square metre for a mid-range specification, covering the building work itself: groundworks, foundations, brickwork, roof, windows, doors, electrics, plumbing, plastering and basic finishes. For a typical 20m² extension that puts the build somewhere around £36,000–£60,000 before VAT. Remember to add 20% VAT and, where relevant, professional fees for drawings and structural calculations.

Double-storey extensions often look more expensive overall, but they can work out cheaper per square metre — you pay for one set of foundations and one roof but gain two floors of space. Kitchen and bathroom extensions cost more once you add the fit-out: units, worktops, appliances and sanitaryware sit on top of the build price.

The biggest factors that move the number are the size and specification, the type of extension (a side return or wraparound is more involved than a simple rear extension), ground conditions, and site access — a rear garden with no side access adds cost because everything has to be carried through the house.

The West Midlands sits close to the national average and well below London and the South East, which typically run 20–40% higher. Done well, an extension usually adds around 10–20% to a property's value, so it's often a better financial move than the cost and upheaval of moving.

These are ballpark figures to help you plan — every property is different. The only way to get an accurate price is a proper site visit and a written quote. If you're weighing up an extension anywhere across Solihull, Stratford-upon-Avon or the wider West Midlands, get in touch and we'll give you a realistic figure.