Mammoth Design & Build is a specialist home extension company creating bright, modern living spaces across North, South and East London. Our experienced team designs and builds high‑quality house, loft and kitchen extensions tailored to the way you live.

We focus on side return extensions, rear extensions and wraparound extensions that transform underused areas into spacious kitchens, open‑plan living rooms and practical family spaces. Every project is carefully planned to maximise natural light, improve flow and add real value to your home.

From the first design consultation to the final finish, Mammoth Design & Build provides a complete, hassle‑free service. The team works closely with you on layouts, materials and finishes to ensure your new space looks great and functions perfectly day to day. Clear communication, reliable timelines and attention to detail sit at the heart of every build.

Whether you want to extend your kitchen into the side return, create a larger open‑plan ground floor with a rear extension, or combine both with a full wraparound, Mammoth Design & Build can help you make the most of your London property.

Get in touch today to discuss your ideas and request a free, no‑obligation quote for your house, loft or kitchen extension in North, South or East London.