Modern black extension with large glass doors attached to a brick house, illuminated interior visible, surrounded by a well-maintained garden and trees at dusk.
A man with short brown hair, wearing glasses, a black jacket, and a black shirt, standing outdoors with trees in the background.

Hi, my name is Andrew, one of the founders at The Extension Co.

Welcome to Extension Co. the best value way to extend your new build home. We specialise in extensions created specifically for the most popular house types from leading UK developers. With a strong presence across the Midlands and ability to work across England and Wales, we help clients - from growing families to home-workers - unlock new potential in the homes and gardens they already love.

We Guarantee Planning Permission

Subject to site appraisal

We believe that as someone inexperienced with the planning process you should not have to take the risk of a planning refusal and potentially waste your hard earned money. That responsibility should sit with us as professionals with over a decade of experience dealing with planning departments across the country.

Our mission is simple:

High-quality design

Streamlined process

Exceptional value

Modern wooden house with large glass sliding doors, outdoor seating area, and string lights, surrounded by green lawn and trees at sunset.
Modern addition with large glass sliding doors and black exterior wall attached to a brick house in a backyard with a stone pathway and landscaped garden.
A home office with a wooden desk, a laptop, a notepad, a wooden chair, bookshelves with books and plants, and a large window with trees outside.