How much does a house extension cost in Worcestershire? (2026 guide)

The honest answer to "how much does an extension cost?" is: it depends — but not as much as people fear. After 36 years of building extensions across Worcestershire, we can give you realistic 2026 numbers.

The headline numbers

For a straightforward single-storey rear extension on a typical Worcestershire family home in 2026, you should budget roughly £2,300–£2,800 per m² for a good specification. A 25 m² kitchen extension therefore usually lands between £57,500 and £70,000 all-in — building work, glazing, kitchen fit and finishes included.

Two-storey extensions actually work out cheaper per m² because you're getting two floors for one set of foundations and one roof — budget £1,900–£2,400 per m² for a well-specified build.

Orangeries and glazed garden rooms typically run higher, from £3,000 per m² upwards, because the glazing package drives the price.

What actually moves the cost

Five things move the number more than any other:

• Ground conditions. A tricky slope, a high water table or made-up ground can add £5,000–£15,000 in groundworks before you're above damp course.
• Steelwork. Every large opening between the old house and the new one needs a beam; the number and size of those beams matters.
• Glazing. A big sliding door or lantern rooflight can add £5,000–£20,000 on its own.
• Kitchen and bathroom spec. These are where budgets balloon quickly.
• Finishes. Engineered oak flooring, tiled utility, plastered reveals — the finish spec is easy to under-price at the start.

How to keep control of the budget

We always give clients a written schedule and a written cost breakdown. We'd rather have the awkward conversation about spec before we start than surprise anyone during the build. If you'd like a genuine estimate for your project, get a free quote and we'll take a look.