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16 Single-Storey Side Extension Ideas


Architectural Design


House Extensions

16 Single-Storey Side Extension Ideas


Space-saving, innovative and timeless, maximise the layout of your home with a single-storey side extension. With a versatile design that can be implemented for different property types, including Victorian terraces, detached properties and more, this stylish addition to your home can enhance your living space with ease, without infringing on your back garden, patio, or the rear of your property.

Ideas for a single storey side extension 

With years of experience and expertise, BASE brings you the latest ideas for building a single-storey extension on the side of a house, so you can make the most of your property and enjoy it for years to come.

Seamless indoor-outdoor design

Bespoke sliding patio doors or bifold doors are an ideal choice for a single-storey side extension, particularly if you are limited on space and are looking to minimise the intrusion onto your patio or lawn. This design not only enhances the natural light but also provides a seamless transition between your indoor and outdoor spaces. 

Contemporary glass box extension

Opt for a sleek, glass box extension to give your home a modern and minimalist look. This design maximises natural light and offers unobstructed views of the outdoors. Focusing on clean lines and an understated aesthetic with a sleek aluminium or steel structure that lets the view do the talking, and enhances your space while bringing the outside in. 

fairy glen garden

Classic brick extension

Maintain the traditional aesthetic of your home with a brick extension that matches the existing structure. This timeless design adds charm and value to your property, flawlessly extending your home with sympathetic design touches and a design and build that’s in keeping with the home you know and love. 

caynton manor front of the property

Cottage style side extensions

Add a touch of rustic charm with a cottage side extension. In contrast to a minimalist, contemporary structure, focus on exposed brick and incorporate natural materials into the design, such as reclaimed oak and lipped casement windows to create a cosy, inviting space to relax and unwind of an evening or afternoon.

living room at windmill cottage
base Architecture

Expansive kitchen-diner

Effortlessly transform your home with a spacious kitchen-diner side extension. The innovative design of a single storey side extension means you can instantly extend your kitchen with minimal impact on appliances and fittings, adding space for a large dining room table,  an extra cooking area, or comfy seating, for a blended space that’s the heart of your home.  

thornfield home kitchen
Architectural and Interiors

Home office or family study

If you’re struggling for space and need a relaxing work environment with plenty of natural light, dedicate your side extension to a home office.  As a natural extension to the home, side extensions can act as the perfect workspace, so you can work from home with plenty of separate space and light while blending family living as and when you please. 

Create a productive work environment with a side extension dedicated to a home office or study. Ensure it’s equipped with plenty of natural light, ergonomic furniture, and indoor plants for a welcoming area to sit and work. 

lakeside lodge study
181106 base Lakeside Lodge

Skylight-filled extension

Seamlessly blend your side extension to your existing property interior by adding a single-storey side extension with built-in skylights. Flood the space with natural light with contemporary fixed skylights to transform your build into a bright, airy and spacious area that’s multi-functional, clean and contemporary. 

the vennington large bathroom

Get inspired with recent projects 

Rustic timber extension

Use reclaimed timber for your extension to give it a rustic, eco-friendly feel. This design works well with both traditional and modern homes. This style of interior is suited to flagstone floors and country-style kitchen appliances. Place an emphasis on natural materials, woven furnishings, neutral colours and practical interior design to complete this look.

Industrial-style extension

Modernise your downstairs living area by adding a chic, urban feel to your space with industrial design influences. A small side orangery or side return extension can be transformed into a modern living space that incorporates natural elements such as rustic exposed brick, metal beams, concrete worktops and large windows.

thornfield bathroom
Architectural and Interiors

Side orangery extension

Orangery extensions are an innovative way of expanding your space, incorporating a timeless, European-style structure into your side extension design. Traditionally more robust and structural than a conservatory, a side orangery extension blends a modern home extension with a timeless, stylish design. As orangery extensions are robustly built with insulation, even a small side orangery extension can increase the value of your home thanks to the functional design that’s suited for year-round use. 

burcot manor rear patio

Victorian terrace side return extension 

If you live in a terraced house, single-storey side extensions can be a fantastic way to naturally expand the space in your property while remaining sympathetic to the original build and external architecture. Often referred to as a side return extension, this type of build is particularly popular for a Victorian terraced home, as a small side return extension utilises the dead space created by the galley kitchen, enabling you to add more square footage to your home without extending the rear of your property. 

caynton manor walk in shower

Compact utility room

A practical and stylish solution for a small side extension, a compact utility room is a perfect use of the space, keeping your laundry and utilities nicely tucked away. Clever built-in storage and an optimised room layout will ease household tasks, while the bright, airy space afforded by skylights will bring plenty of natural light into the space. 

Cosy reading nook

What better way to while away the hours than with your reading nook? Add a built-in upholstered storage bench or cosy armchair surrounded by foliage, blankets and mood lighting for the ultimate literary retreat. Enhance your side extension even further with built-in bookshelves for a whimsical, unique space. 

Children’s playroom

A side extension can serve as a dedicated playroom for your children, keeping toys and activities contained in one area so you can free up space in other areas in the home. With plenty of natural light and an insulated design, a playroom utilises the extra space efficiently so you can enjoy family time with ease in comfort and style. 

Spa-like bathroom

Plan a luxurious side extension such as a guest bathroom complete with a freestanding bath and high-end features. Bring the look and feel of a spa experience to your home – a glass-centric design will add a bespoke feel to the space, where you can relax in solitude and drink in the views.  Turn your side extension into a luxurious spa-like bathroom with high-end fixtures, a soaking tub, and a rain shower.

the river house bathroom

Home gym

If you’re looking to keep fit without leaving the comfort of your own home, a side extension may just be the answer. For the ultimate wellness space, plan and design your very own home gym that includes all your workout essentials. A well-ventilated, naturally lit space can make exercising at home a pleasure.

With years of experience and a dedicated team of experts, BASE can work with you to craft the ultimate side extension design. A bespoke extension to the side of your house maximises space, light and comfort, and effortlessly enhances your living area for years to come. 

kennedy road indoor pool

Get started with BASE 

Planning a single story side extension: Important considerations 

  • Side extension planning rules can differ in certain areas, depending on your postcode as well as the age and status of your property. For example, listed buildings will have certain planning restrictions and legislation to follow should you wish to make any adjustments to the external finish of the property. 
  • A traditional brick extension or single-storey side extension can be a good choice of side extension if you live in an area with restrictions in place, as you can extend your home without impacting the external aesthetic. 
  • Single-storey extensions are naturally less encroaching on neighbours compared to a double-height extension, and a brick build will enable your side extension design to effortlessly blend in with the look and feel of the area. 
  • You may need to consider a conservation roof light extension – be sure to check with your local architect or planning authority prior to planning a build. 

Single-storey side extension: FAQs

Does a single-storey side extension add value?

You can expect to add between 5-8% additional value to your home with a side extension. Depending on the quality of the build and interior features, this figure can increase considerably. 

How much does a side extension cost?

A single-storey side extension can cost from anything from £20,000 to upwards of £50,000. The exact cost will depend on the size of the extension, project scale, timelines, material costs and labour costs. Speak to an architect to get a better idea of how much a side extension can cost. 

Do I need planning permission for a single-storey side extension?

Speak to an architect to understand side extension planning rules in your area. Permitted development rights (PD) do allow homeowners to build on their property, but the regulations and criteria can be very specific, so conduct due research before finalising any project plans. 

What are the benefits of a single-storey side extension? 

As well as adding additional living space to your home, a single-storey side extension can cost considerably less than a two-storey build. Additionally, the flexibility of adding a side extension without knocking through means even the smallest of spaces can be enhanced and transformed with the right design. 

Plan your next extension project with BASE for unparalleled expertise, insight and guidance into how to make the most of your property. Contact our friendly team to get started and truly bring your project to life. 

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