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By: Declan Stewart
Declan re-joined Build Team in July 2021 and is our Head of Brand Design. He graduated with a degree in Design for Visual Communication from Croydon School of Art, and has since worked across several different fields including publishing, events, retail and education. When he's not designing or marketing, he likes to go fishing.
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A side return extension in London costs roughly £70,000 to £120,000 all-in in 2026, at about £2,800 to £5,500 per m², including the build, a new kitchen-diner, glazing, professional fees and 20% VAT. A small basic side return starts from around £55,000; a large, high-specification…
Read MoreDiscover utility room design ideas for modern homes, from laundry storage and layout planning to clutter-free family living.
Read MoreExplore internal courtyard design ideas that bring natural light, fresh air and a greater sense of space to modern UK home extensions.
Read MoreA realistic builder’s quote is fixed (not an estimate), itemised, and states clearly what is included. For a single-storey London extension in 2026, expect construction of about £2,800 to £5,000+ per m², with professional fees adding 10 to 15%, a 10 to 20% contingency, and…
Read MoreThis is a question we are frequently asked by prospective clients, and our answer is always the same; the cost is dependent on the size and the design of the scheme. The final cost of each side return extension will differ as the designs are tailored to suit the needs and requirements of each client. This makes it very difficult to give a generic guide price.
Read MoreA flat roof is the cheaper, more contemporary choice and is easier to fill with daylight through rooflights, but it needs careful drainage and more maintenance. A pitched roof costs more (roughly £4,000 to £7,000 extra on a typical extension) but lasts far longer, needs…
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