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Extensions

Kitchen extensions

A bigger kitchen-diner, designed and built as one project. Designed, approved and built by SK Residential, with a fixed price in writing for the agreed specification.

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What is a kitchen extension?

A kitchen extension is a single-storey extension designed around a new kitchen, usually creating an open-plan kitchen, dining and family space that opens onto the garden. Planning the kitchen layout at the same time as the building means the drains, steels, windows and power end up where the kitchen needs them.

Open-plan kitchen extension with sage green units, island and rooflights

We design the room and the kitchen together, so the island, sink and appliances line up with the structure rather than fighting it. You can use your own kitchen supplier or have us supply and fit one. Either way we co-ordinate the trades so the room is finished in one sequence.

Typical time on site
12 to 18 weeks
Guide price
£2,600 to £4,000 per m², plus the kitchen
Building regulations
Required

What is included?

  • Combined building and kitchen layout design
  • Planning or permitted development check
  • Drainage, gas and electrics planned to the kitchen layout
  • Steelwork, roof, glazing and insulation
  • Kitchen fitting, worktop templating and appliances
  • Tiling, flooring and decoration-ready finish

How much does a kitchen extension cost?

A 20 m² kitchen extension with a mid-range kitchen typically costs around £65,000 to £95,000 including VAT.

Kitchen extensionsGuide price incl. VAT
Extension build£2,600 to £4,000 per m²
Kitchen supply and fit, mid-range£10,000 to £20,000
Kitchen supply and fit, high-end£20,000 to £40,000

Unit: build per m², plus the kitchen. Guide ranges only; your price is fixed in writing after the survey.

Use the guide price tool for a figure based on your size and specification, or see all guide prices.

Does a kitchen extension need planning permission?

England

In England a single-storey rear extension can often go ahead under permitted development: up to 3 m deep on an attached house or 4 m on a detached one, no higher than 4 m, with eaves no higher than 3 m within 2 m of a boundary. Deeper extensions, up to 6 m or 8 m, need prior approval from the council first. Flats, maisonettes, listed buildings and houses whose permitted development rights have been removed need full planning permission.

Wales

Wales has its own permitted development rules, set by the Welsh Government. Small single-storey rear extensions can often go ahead without an application, but the limits differ from England's and there is no larger-extension prior approval route, so we check the current Welsh rules for your house before drawings are finalised.

Scotland

Scotland has its own householder permitted development rules, and small single-storey rear extensions are often covered. Whatever the planning position, you need a building warrant from the council before any building work starts, and a completion certificate at the end.

Northern Ireland

In Northern Ireland permitted development is set by the Planning (General Permitted Development) Order (Northern Ireland) 2015, and small single-storey rear extensions can often go ahead without an application. Building control approval from the council is still needed.

What about building regulations?

Building regulations cover the extension, the drainage, ventilation for the cooker hood and the new electrical circuits.

What should I think about before starting?

  • Islands with sinks or hobs need drainage and power routed in the slab.
  • Extraction to the outside must be planned before the walls go up.
  • Worktops are templated after the units are fitted, adding a short gap before completion.
  • Underfloor heating suits large kitchen-diners with glazed walls.

How does the project run?

  1. Tell us about the project. Call, use the guide price tool or send the form with a few photos and a postcode.
  2. Free site visit. We measure up, look at access, drains and the structure, and talk through options and budget.
  3. Design and fixed price. You get drawings and a written price for the agreed specification before anything is ordered.
  4. Build and hand over. Our teams build to the programme, building control inspects, and you get the completion paperwork at the end.

Questions about kitchen extensions

How much does a kitchen extension cost?

The build is usually £2,600 to £4,000 per square metre including VAT, and the kitchen adds roughly £10,000 to £40,000 depending on the units, worktops and appliances.

Can I use my own kitchen company?

Yes. We work to their drawings and co-ordinate delivery and fitting dates.

How long will we be without a kitchen?

Usually only the final few weeks, when the old kitchen comes out and the wall is opened. We can help set up a temporary kitchen.

Do kitchen extensions need planning permission?

They follow the same rules as any single-storey extension. Many in England are permitted development.

Is underfloor heating worth it?

In large open-plan rooms with big glazed doors it frees up wall space and heats evenly. We include it as an option.

Related projects

Guides

Where do we build kitchen extensions?

We take on kitchen extensions across England, Wales, mainland Scotland and Northern Ireland. Choose your area:

Planning an extension, loft or new home?

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