How much does an extension cost in West Yorkshire?

Single-storey extensions in West Yorkshire typically run £1,800 to £2,800 per square metre for a standard specification in 2026, so a 20 square metre extension usually lands between £36,000 and £56,000 before VAT, professional fees and finishes. Stone-faced construction, sloping sites and conservation-area requirements push costs to the upper end and beyond, which is why Calderdale and Holme valley work generally exceeds the county average.