How Much Does an Extension Cost in Worcestershire in 2026?

Extension costs in Worcestershire have shifted significantly over the last two years. Whether you are planning a kitchen extension in Kidderminster, a wraparound in Stourport, or a double-storey build in Bromsgrove — this guide gives you real, up-to-date 2026 numbers based on quotes we are actually pricing right now.

We have based these figures on completed projects across DY10, DY11, DY12, DY13, WR1–WR5 and surrounding postcodes. Costs assume a fully project-managed build with itemised quotation, building regulations compliance, and certified subcontractors.

Single-storey rear extension costs

A single-storey rear extension is the most common project we deliver. Typical 2026 cost in Worcestershire:

• Small (under 15m²): £25,000 – £38,000
• Medium (15–25m²): £35,000 – £55,000
• Large (25–40m²): £50,000 – £75,000
• Premium spec with bi-folds + roof lantern: add £8,000 – £15,000

These figures include groundworks, foundations, structural steelwork, brickwork, roofing, plastering, electrics, plumbing, flooring, and standard internal finish. They do not include kitchen units or appliances — which we typically supply separately on a cost-plus basis or coordinate with your chosen supplier.

Double-storey extension costs

Double-storey extensions offer better value per square metre because foundation and roof costs are spread across two floors:

• Small double-storey (under 25m² total): £55,000 – £85,000
• Medium double-storey (25–40m² total): £75,000 – £115,000
• Large double-storey (40–60m² total): £100,000 – £160,000

Side and wraparound extensions

Side extensions are particularly popular in Stourport, Hagley and Bromsgrove where larger plot sizes allow for substantial side builds:

• Single-storey side extension (10–20m²): £28,000 – £50,000
• Wraparound (side + rear combined, 25–45m²): £55,000 – £95,000
• Two-storey side extension (20–30m² per floor): £75,000 – £125,000

What drives the cost up or down

Quotes vary across builders not because of inflated margins but because of how each project is specified. Key drivers:

• Structural steelwork — replacing a load-bearing wall adds £3,000–£8,000
• Bi-folds and roof lanterns — premium versus standard alters the price by £6,000–£12,000
• Underfloor heating — typically adds £2,500–£4,500 across an extension
• Drainage diversions or new foundations on difficult ground — £3,000–£10,000
• Period property considerations (matched brick, lime mortar, conservation conditions) — 10–20% premium

How JCT Building quotes

We provide a fully itemised written quotation after a free site visit. Every cost is broken down — materials, labour, subcontractor work, contingency. No vague allowances and no hidden fees. We have built our reputation on transparency, which is why we hold a 5-star rating across all 31 of our verified reviews.