Loft conversion cost in the UK (2026)
A loft conversion is one of the most cost-effective ways to add a bedroom without losing garden space — but the price swings widely depending on the type of roof you have and the finish you want. Below is what UK homeowners are actually paying in 2026, broken down so you can sense-check any builder's quote.
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Cost ranges are indicative 2026 UK averages compiled from trade rates and published industry data, to help you budget and sense-check quotes. They are general guidance, not a quotation or professional advice. Always obtain written quotes from qualified professionals. This page may contain affiliate links; we may earn a commission at no cost to you.