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5 single storey extension ideas for your home (on a budget)

5 min read
Oct '25 • by Heather

Quick summary

A single storey extension on a budget typically costs between £50,000 and £95,000, which works out to roughly £1,000 to £2,000 per square metre depending on size and finishes. These prices exclude VAT and are based on projects completed in 2020-2021; larger or more complex designs may cost more, but basic extensions can be achieved within this range.

When it comes to expanding your home, a single storey extension is one of the most popular ways of achieving this. Most commonly, they’re used to enlarge key living spaces in your home, such as the living room or kitchen, and can make a huge difference to the look and feel of a space. And, because they’re so popular, it’s very easy to find single story extension ideas!

At Resi, we’ve helped over 5000 people grow their homes, by providing design, finance, and vetted contractor introductions. This means we’ve got plenty of single storey extension projects under our belt. Here are some of our favourite achievements to help inspire your own extension project.

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Combine a single storey rear extension with large bifold doors

A single storey rear extension in Runnymede - dinner

Single storey rear extension in Runnymede, completed 2020

Single storey rear extension in Runnymede, completed 2020

Budget: £60,000 - £95,000
Location: Runnymede, Surrey
Completed in: 2020

For this single storey extension, we doubled the feeling of space by combining the new addition with a new open-plan living space. We knocked through an existing wall between the living room and kitchen to maximise on the space created in this project. To keep this room light and bright throughout, our designers incorporated three separate skylights, as well as a large set of bi-fold doors to the rear of the property. Not only do these doors provide a panoramic view of the garden, they also help connect the inside and outside spaces, giving the illusion of one continuous space. This large single storey extension is large enough for the family’s entire wishlist of fittings and decor, including a six-seater dining table, kitchen island/breakfast bar, plus cosy L-shaped sofa. Resi designers even found space for an isolated utility room, which we tucked away so the family wouldn’t be distrubed by any noisy appliances.

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