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After Single Storey Extension Ideas? We've Got You Covered

single storey extension ideas
(Image credit: David Butler c/o Gentleman Architect)

Perfect for adding much needed space to a home, single storey extension ideas can come in all shapes and sizes. Plus, as they're often achievable under Permitted Development, single storey extensions can save the heartache – and expense – of navigating the planning process. 

Whether you're looking for a larger kitchen, to open up to the garden or to alleviate pressure from pokey existing living spaces, single storey extensions can often unlock the potential of a house. 

We've collected our favourite designs from successful additions to houses of all styles (including uninspiring semi-detached properties and dated bungalows) to give you an idea of what is possible when building an extension

Take a look below for loads of inspiration and top tips to get you on the right track for your own project. 

(MORE: Get a quote for your own extension project)

A Light-filled Extension Idea to Transform a Dark House

modern single storey extension ideas

(Image credit: Richard Downer Photography )

A stone lean-to shed was replaced with a contemporary glass extension designed by Van Ellen + Sheryn to extend the kitchen diner. A large glazed elevation provides much-needed views out onto the garden. 

A Flexible Work/Live Single Storey Extension Idea

single storey extension ideas

(Image credit: Mo Photo)

KE Design extended this three-bedroom semi-detached house to create a versatile space for a young family. Ingenious rear extension design ideas included an integrated workspace that closed away like a cupboard when not in use, as well as a flexible design that can be adapted as the kids grow older and the family's lifestyle changes. 

(MORE: How to Build a Budget Extension)

This Single Storey Extension Idea Opened up A Semi-detached House to the Garden

single storey extension ideas for semi detached house

(Image credit: Jim Stephenson)

"The homeowners behind this extension project are Mediterranean and they wanted an outdoor covered area to sit and enjoy the garden. The house is west facing at the rear and we [Nimtim Architects] designed the roof canopy to give shelter as well as reduce the solar gain from the largely glazed rear elevation," says Allie Mackinnon, project runner for Hutch House, Nimtim Architects. 

"For those extending, the ventilation and overheating aspects of your design are important to consider and we would suggest plotting the proposed scheme in-situ and noting how the sunlight affects this area throughout the day" 

Contrasting a Modern Single Storey Extension Design Idea with a Period House 

single storey extension ideas cost

(Image credit: Nigel Rigden)

By adding cutting-edge design to a traditional granite house, Stan Bolt transformed this property into something really special and worthy of it's coastal plot. 

A Small but Mighty Side Single Storey Extension Idea

single storey extension ideas

(Image credit: c/o Create Bespoke)

By simply adding a small side return extension to the left of this terrace house has transformed the way the homeowners interact with the space. 

Glazing was the key to this project with a rooflight bringing light in from above and a picture window and glass sliding door creating an amazing inside-outside effect. 

Add Character with an Oak Single Storey Extension

single storey extension ideas

(Image credit: Nikhilesh Haval)

Once a dated and uninspiring house, the homeowners created new-found character by using oak frame to build their two single-storey side extensions.

(MORE: Oak Frame Extensions)

L-shaped Single-storey Extension Idea for Dated Bungalows

single storey extension ideas for bungalow

(Image credit: David Barbour)

After spotting potential in a 1960s bungalow, the homeowners added a single-storey extension to create an l-shaped, modern home.

Going to the Side is a Great Single Storey Extension Idea 

side single storey extension

(Image credit: David Barbour)

Side return extensions are extremely popular with terrace house (like this stunning example by Gareth Gazey Architects), as they utilise a usually wasted space that can go ignored. 

The homeowners used the original bricks from the wall demolition in the garden, steps and to create an internal brick wall. Together, this provides a sense of continuity from the large kitchen and living spaces and into the great outdoors.  

Add a Timber-clad CLT Single-Storey Extension

CLT extension to a listed barn conversion

(Image credit: James Morris)

This CLT extension to a listed barn conversion is a prime example of how to marry contemporary with traditional.

(MORE: Extensions for Every Budget

Update a Period Home with Glass Box Extension Ideas 

Light-filled Extension to a Victorian Home

(Image credit: .)

After living in the house for two years, the homeowners added this beautiful single-storey extension to create a living space that was flooded with natural light.

Look at Contemporary Single-storey Extension Ideas for Traditional Cottages

Grade II listed cottage renovated and extended

(Image credit: Mark Boulton)

These homeowners enlisted the services of Charlie Luxton to help them create this fabulous contemporary extension scheme that has opened up the living space of a listed cottage.

Get a Quote for Your Own Extension Project

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Amy Reeves

Assistant Editor Amy began working for Homebuilding & Renovating in 2018. She has an interest in sustainable building methods and always has her eye on the latest design ideas. Amy has interviewed countless self builders, renovators and extenders about their experiences for Homebuilding & Renovating magazine. She is currently renovating a mid-century home, together with her partner, on a DIY basis, and has recently fitted her own kitchen.