Single Storey Extension Ideas, Plans & Costs

Single Storey Extensions: Ideas, Costs and Planning Advice

If you're looking to create more space in your home or flat, a single storey extension is one of the most popular and practical solutions. Whether you're dreaming of a bigger kitchen, a light-filled dining area or an extra room to work or relax, single storey extensions can dramatically improve the way you live — without the cost and stress of moving.

At Draw Plans, we provide professional architectural design services and create single story extension plans across Greater London, with packages starting from just £795 + VAT. In this article, we’ll guide you through the best single story extension ideas, estimated single story extension costs, and expert tips to help you design the perfect layout for your space.

What is a Single Storey Extension?

A single storey extension adds new living space to the ground floor of your property, either at the rear, side, or wrapping around the existing structure. It’s ideal for both houses and flats with direct ground-level access. These extensions are typically used to extend kitchens, add utility rooms, create open-plan living areas or even build ground-floor bedrooms.

Unlike double-storey extensions, single storey designs are often quicker to build, more affordable and more likely to fall under permitted development rights — meaning you may not need full planning permission.

Single Story Extension Ideas

There are countless ways to design a single storey extension depending on your goals, property type and lifestyle. Here are some of the most effective and popular single story extension ideas.

Rear kitchen extension

A rear extension is ideal for opening up your kitchen and dining area into a bright, modern open-plan space. Add large sliding or bi-fold doors and rooflights to bring in natural light and create a seamless connection with your garden.

Side return extension

Terraced and semi-detached homes often have unused space along the side alley. A side return extension allows you to reclaim this area and dramatically improve the size and layout of your kitchen or living space.

Garden office or studio

Create a peaceful and productive workspace by adding a home office or studio at the rear of your property. It’s the perfect setup for remote working or running a small business from home.

Utility room or boot room

A modest single storey extension can make everyday life easier. Add a separate utility room for laundry and storage, or a boot room to help keep the rest of your home clutter-free.

Ground floor bedroom or shower room

If you're planning for accessibility, multi-generational living or simply future-proofing your home, a ground floor bedroom or bathroom can be a smart addition.

Single Story Extension Cost in Greater London

The single story extension cost will vary depending on the size, layout and level of specification, but here’s a useful breakdown of current estimated prices in Greater London:

Basic quality build: £1,800 – £2,200 per m²
Mid-range specification: £2,200 – £2,600 per m²
High-end finish: £2,600 – £3,200+ per m²
Planning drawings by Draw Plans: from £795 + VAT

Your total budget should also include fees for structural engineering, building control, and potentially planning applications — all of which Draw Plans can help you manage.

Tip: Always include a contingency of 10–15% for unforeseen construction costs.

Planning the Best Single Story Extension Layout

The success of a single storey extension comes down to thoughtful planning and design. Here’s how to create a layout that works beautifully for your space and lifestyle.

Consider how you use your home

Start with your day-to-day routine. Do you need more space to cook, entertain, work or relax? Let function guide your floor plan.

Think about natural light

Use skylights, wide windows and glazed doors to maximise natural light and ventilation. A brighter space feels larger and more inviting.

Open up the layout

Removing internal walls can dramatically improve flow between rooms. Consider a broken-plan or open-plan layout that connects your kitchen, dining and living areas.

Match the style of your home

Blend new with old by using similar materials, rooflines and window styles. A well-integrated extension feels like a natural part of your property.

Add smart storage

Incorporate built-in cupboards, hidden laundry zones or shelving in the design to keep things tidy without sacrificing floor space.

Do You Need Planning Permission?

Many single storey extensions fall under permitted development rules, meaning you won’t need full planning permission — as long as your extension meets certain size and location requirements. However, planning permission is required if:

You live in a flat or maisonette
Your property is listed or in a conservation area
You want to build beyond permitted limits

Draw Plans can help you determine whether your project needs permission and submit all the necessary planning documents for you. Our team understands local council guidelines across Greater London, saving you time and stress.

Why Choose Draw Plans?

At Draw Plans, we make the process of extending your home as simple and affordable as possible. Our fixed-price packages start at £795 + VAT and include:

Measured site survey
Architectural drawings
Unlimited design revisions
Planning or permitted development advice
Submission support to your local council

We’ve helped hundreds of homeowners across London get their single story extension plans approved quickly and easily.

Client Testimonials

Here’s what some of our happy clients had to say:

“We’re so pleased with the rear extension that Draw Plans helped us design. The space is now bright and open, and the drawings were approved without any issues. Great value too.”
– Natalie & James, Walthamstow

“We were quoted more than double elsewhere. Draw Plans gave us brilliant service and the plans were approved within weeks. We now have the perfect kitchen diner for our family.”
– Arjun K., Harrow

“Our new home office extension is just what we needed. The process with Draw Plans was simple and professional from start to finish. Highly recommend.”
– Chloe R., Clapham

Ready to Start Your Project?

If you’re planning a single storey extension in Greater London, we’re here to help. From initial layout ideas to full planning drawings, Draw Plans will guide you every step of the way — starting from just £795 + VAT.

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