Planning a home extension in 2025? This friendly guide breaks down real UK cost ranges, explains what affects the price and helps you understand the full picture, from build costs to design fees and interior finishes. Perfect for homeowners who want clarity, confidence and no surprises.

Planning a home extension can feel overwhelming, but it doesn’t have to be. Our step-by-step guide helps UK homeowners navigate budgeting, planning permission, and design, so you can create a beautiful, functional space that truly works for your family.