Small kitchen extension ideas for UK homes in 2026: side-return, rear bump-out, wrap-around and kitchen-diner layouts with typical costs and planning rules. This guide is written by PG Property Repairs and Renovations, an FMB and TrustMark accredited building company based in Worthing, using real costs and timescales from projects completed across Worthing, Lancing, Shoreham, Brighton and the wider West Sussex area.