Double storey extensions: A guide to costs, design and types

a large double storey extension to a modern property
(Image credit: French + Tye for Bradley Van Der Straeten Architects)

While a double storey extension may seem like a much larger project to undertake than a single storey one, they're often a more budget-efficient way to add extra space to your home and cheaper than moving house when it comes to additional rooms for a growing family. 

Of course, a building an extension will also transform the look of your home in a much more meaningful way from the outside, so it's important to design the right extension for your property. 

An experienced homes journalist and editor, Lucy has written about renovation, property and gardens since 1990, first working her way around the interiors departments of women's magazines before switching to interiors-only titles in the mid-nineties. She was Associate Editor on Ideal Home, and Launch Editor of 4Homes magazine, before moving into digital in 2007, launching Channel 4's flagship website, 

In 2018, she became Global Editor in Chief for sister website, taking the site to a global success. She is now Global Editor in Chief of Homebuilding's sister site Homes & Gardens. She is also a serial renovator and owns rental properties.