
The Cost of an Extension in 2026 – A Detailed Breakdown of Current Material Prices
The last few years have been a roller‑coaster for the building sector: post‑pandemic labour shortages, the fallout from the Ukraine conflict, and a wave of green‑building mandates have all left their fingerprint on material costs. If you’re planning a kitchen‑plus‑loft conversion, a two‑storey family extension, or a modest garden office, you’ll need a realistic budget today—not the numbers you saw three years ago. Below, we unpack the most common materials, their 2026 price points, and the factors that are driving them. All prices are average UK/ROI retail…














