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Two Storey Extensions · South West England
Double the space.
One build.
Two storeys in one project – a ground floor kitchen-diner below, a new bedroom or bathroom above. One period of disruption, one cohesive result, far better value than two separate builds.
Why Two Storey
The maths makes
it compelling.
A two storey extension costs roughly 60–70% more than single storey but delivers twice the floor area. Groundworks, foundations, and roof are shared across both floors.
Most families who consider a single storey extension end up wishing they’d gone two storey. The additional cost is significant but the additional value – financially and in terms of how the house works – is greater still.
A typical two storey project replaces a dark kitchen with an open-plan kitchen-diner at ground level, and adds a master bedroom or family bathroom directly above. Two of the most value-generative improvements you can make to a family home – done simultaneously.
At Kura Spaces, we match you with builders who understand two storey work specifically – the structural requirements, the planning implications, and the sequencing that keeps your disruption to a minimum.
Indicative Pricing · South West England
Real prices.
No surprises.
Two storey extensions deliver far better value per square metre than single storey. These indicative ranges are based on real South West build data for 2026.
Please note: Prices are indicative, based on South West England build rates in 2026. They include all structural work to a bare finish. Kitchen and bathroom fit-outs are priced separately. VAT at 20% not included.
Specification Levels
Essential vs
Signature.
The same two levels applied consistently across both floors. Everything chosen to work together as one cohesive result.
| Category | Essential | Signature |
|---|---|---|
| Flooring | Engineered wood or LVT, 5 colour options | Wide plank solid oak or premium LVT, 12 options |
| Windows | uPVC in white or anthracite, double glazed | Slimline aluminium, 8 RAL colours, thermally broken |
| Doors | Painted solid-core flush panel doors | Solid oak or shaker-style, taller 2.2m height |
| Ironmongery | Brushed chrome throughout | Brass, matt black, or nickel – your choice |
| Lighting | Recessed GU10 downlights throughout | Plaster-in downlights with dimmers throughout |
Colour Palettes
Five palettes.
One for you.
Each palette determines your external finish, window colour, ironmongery, and door colour – a complete, considered scheme across both floors.
Planning & Regulations
What you need
to know before
you begin.
Two storey extensions almost always require a full planning application. Here’s what to expect.
Full Planning GuideFull Planning Required
Two storey extensions extend beyond the plane of the existing roof and almost always fall outside Permitted Development rights, requiring a full planning application.
Design Considerations
Planning officers assess design quality, materials, impact on neighbours, and relationship to the existing house. Your matched Kura builder will guide you through this from the start.
Building Regulations
All work requires Building Regulations approval. Your builder manages all applications as part of the build.
The Kura Process
From design to
both floors finished.
Use the configurator to choose your footprint, spec level, layout, palette, and add-ons. See your indicative price for both floors update as you go.
We match you with three vetted local builders experienced in two storey work. Introductions within 2 working days.
All three builders quote from your Kura brief – the same spec, the same add-ons. Genuinely comparable for the first time.
Your builder manages planning, Building Regs, and the build from start to finish. We follow up to make sure everything was as it should be.
Ready to Begin?
Double your space
in one build.
Use our configurator to design your two storey extension, see your indicative price, and let us introduce you to three vetted local builders who’ll deliver it properly.
Start the Configurator