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Single Storey Extensions · South West England
The extension
your home has
been waiting for.
A well-designed single storey extension changes everything. Not just the square footage – the way light moves through your home, the way your family uses it every day, the way it feels to come through the door.
Why Single Storey
More than extra
square metres.
The single storey rear extension is the most popular home improvement in the UK for good reason. Done properly, it’s transformative.
Most families reach a point where their home works against them. The kitchen that doesn’t have room for everyone. The dining space that’s too small. The dark rear room that feels disconnected from the garden.
A single storey extension – done thoughtfully, with the right builder, to a proper brief – fixes all of that. It opens up the ground floor, brings light in, and creates the kind of space that becomes the centre of family life.
At Kura Spaces, we work exclusively on this kind of project. We understand what makes an extension feel like it was always there – and our job is to make sure yours does too.
Indicative Pricing · South West England
Real prices.
No surprises.
Genuine indicative prices for single storey extensions across the South West, built from real build cost data.
Ideal for a kitchen-diner, garden room, or enlarged living space. Enough room to genuinely change how your ground floor lives.
The most popular size range. Enough to create an open-plan kitchen, dining, and living space that transforms the back of a family home.
Please note: Prices are indicative, based on South West England build rates in 2026. They include structural work, insulation, roofing, glazing, plastering, electrics and plumbing to a bare finish. Kitchen fit-outs, bathrooms, and optional add-ons are priced separately. VAT at 20% is not included.
Size Guide
Finding your
right size.
Not sure how big to go? Here’s a practical guide to what different sizes actually give you.
A proper kitchen with an island, or a generous dining space. Works beautifully as a garden room or snug.
Open-plan kitchen and dining with room to breathe. The starting point for most of our projects.
Kitchen, dining, and a sitting area – all in one space. Room for bi-folds or a roof lantern.
A full kitchen-diner-living space. Often includes a utility or boot room. The choice for families who entertain.
Specification Levels
Essential vs
Signature.
Both levels are genuinely good. The difference is in the materials – the things you notice every single day.
| Category | Essential | Signature |
|---|---|---|
| Flooring | Engineered wood or LVT, 5 colour options | Wide plank solid oak or premium LVT, 12 options including herringbone |
| Windows | uPVC in white or anthracite, double glazed | Slimline aluminium, 8 RAL colours, thermally broken, triple glazed option |
| External doors | uPVC or aluminium bifold/French doors | Slimline aluminium bifold or sliding, larger glass area, flush threshold |
| Internal doors | Painted solid-core flush panel doors | Solid oak or painted shaker-style, taller 2.2m height |
| Ironmongery | Brushed chrome throughout | Brushed brass, matt black, or nickel – your choice |
| Sockets | White flat-plate sockets and switches | Metal flat-plate in brass, black, or chrome – matched to ironmongery |
| Lighting | Recessed GU10 downlights throughout | Plaster-in downlights with dimmers, pendants above island and dining |
| Insulation | Building regulations compliant | Upgraded beyond regs – better U-values, acoustic insulation |
| Exterior | Brick or render to match existing house | Flush render, timber cladding, or premium brick – curated options |
| Roof | Flat roof with quality felt or GRP | GRP flat roof with zinc-effect trim, or standing seam zinc upgrade |
Both levels include all structural work, groundworks, insulation, plastering, first and second fix electrical and plumbing, and decoration in white.
Colour Palettes
The colours that
make a space.
Choose one of our five curated palettes – each designed to work across flooring, windows, ironmongery, and external finish as a complete scheme.
Optional Add-ons
Make it
exactly yours.
Your extension arrives as a beautiful shell. Add what matters to you and see the price update in real time in our configurator.
A fixed roof lantern floods the space with natural light from above. Transformative in deeper extensions where light from the rear alone isn’t enough.
An electrically operated opening skylight with rain sensor. Adds ventilation as well as light – particularly useful in kitchen extensions.
Sits within a pitched or sloped roof section – cleaner look than a standard flat rooflight, works beautifully on shallow-pitch single storey extensions.
The ceiling follows the roofline rather than being flat – creates a dramatic, light-filled space. Most effective on single storey rear extensions. Subject to structural feasibility.
Full-height glazed doors onto a railing. Brings the outside in without needing a step out. Most relevant on two storey and loft projects.
Connected to your existing boiler or heat pump. Even heat, invisible, compatible with most flooring types.
Lower install cost – ideal for smaller areas or where connecting to the heating system isn’t practical.
Zone-controlled smart heating with app control. Works with Nest, Hive, or similar. Installed during the build.
Large-format porcelain paving for a seamless indoor-outdoor flow from your new extension. Installed during the build.
Recessed ground lights, wall-mounted uplighters, or soffit downlights. Wired during the build, ready from day one.
A dedicated EV charger wired in during the build – far cheaper now than retrofitting later.
Shaker or slab cabinetry, laminate or stone worktops, mid-range integrated appliances, stainless sink.
Solid oak or handleless cabinetry, quartz or marble worktops, premium appliances, undermount sink, statement tap.
Bath or shower, WC, vanity basin, tiling, towel rail, and ventilation. Mid-range sanitaryware from our curated range.
Frameless shower, wall-hung WC and vanity, premium tapware, heated towel rail, full-height tiling.
Base units, worktop, sink, plumbing for washing machine and dryer, storage, tiled floor.
Hard-wired ethernet throughout – easy to install during the build, expensive to retrofit later.
Planning & Regulations
What you need
to know about
planning permission.
Most single storey extensions fall under Permitted Development – no planning application required. Here’s how to know where you stand.
Full Planning GuidePermitted Development
Most single storey rear extensions can be built under Permitted Development. For detached houses you can extend up to 8 metres from the rear wall; for semi-detached or terraced properties, 6 metres.
Prior Approval
Extensions between 4–8m (detached) or 3–6m (semi/terrace) require Prior Approval under the Neighbour Consultation Scheme. Simpler than full planning and usually granted.
When Full Planning Is Needed
Conservation areas, AONBs, and listed buildings face tighter controls. Your matched Kura builders will flag this early.
Building Regulations
Always required regardless of planning. Covers structural integrity, insulation, fire safety, drainage, and electrics. Your builder handles all of this.
The Kura Process
From design to
your first morning in the space.
Use the configurator to choose your size, spec level, palette, and add-ons. See your indicative price update as you go. Takes around ten minutes.
We review your brief and match you with three vetted local builders. Introductions within 2 working days of submitting.
All three builders quote from your Kura brief – genuinely comparable for the first time. Choose who feels right. No pressure.
Your builder manages the build from start to finish. We stay in touch and follow up at the end.
Ready to Begin?
Design your extension
in ten minutes.
No builder appointments. No waiting. Start the Kura configurator, see your indicative price, and let us match you with builders who’ll do it justice.
Start the Configurator