Do I need planning permission for a kitchen extension?

Many single storey rear and side return kitchen extensions qualify under permitted development. Larger extensions, wrap-arounds, and properties in conservation areas or listed buildings usually need full planning permission.

How much does a kitchen extension cost?

Kitchen extension cost depends on size, structural work, glazing, and finish specification. A small side return costs considerably less than a large open-plan rear extension with structural glazing. We give realistic ranges once we know your scope.

How long does a kitchen extension take?

Design and planning typically take a few months. Build time varies with size and structural complexity, a straightforward side return is quicker than a large rear extension with steelwork.

Can I still use my kitchen during the building work?

It depends on the scope, some projects allow a temporary kitchen setup elsewhere in the house, while larger rebuilds may need the kitchen out of use for part of the build. We talk this through at the planning stage so there are no surprises.

Does a kitchen extension add value to my home?

A well-designed kitchen extension is usually one of the higher-return home improvements, since it's often the room buyers care about most. The actual return depends on the local market and quality of the finish.

Interior Design Architects London

Our residential and commercial interior design service, delivered by architects who plan every room around how you actually live, not just how it photographs.

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Function Before Finishes

What Interior Design Actually Means Here

A lot of people assume interior design means choosing paint colours and furniture.

At Design United Studio it starts earlier than that, with the layout itself, how light moves through a room, where storage actually needs to go, and how one space connects to the next. The finishes come after the space works.

Residential Interior Design Across London

We provide residential interior design across London, working on everything from single rooms to full-house schemes.

Because our architects design the space and the interior together, there's no gap between how a room is built and how it eventually feels to live in.

Interior Designers In Wimbledon

Being based in Wimbledon Park means we're one of the more established interior designers Wimbledon has, with a close-up understanding of the flat layouts, conversions and period terraces common across SW19 and the surrounding streets.

Local homeowners benefit from a design team that already knows the housing stock, rather than one starting from scratch.

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What We Actually Design

Interior design at Design United Studio usually covers some combination of the following. Spatial layout and room flow, suited to how you use the space.

Bespoke joinery and built-in storage, fitted exactly to the room. Lighting design, covering natural light, task lighting and how a room feels after dark. Material and finish selection, from flooring to hardware.

Furniture layout and specification, whether sourcing new pieces or working in what you already have.

How Interior Design And Architecture Work Together

Because we're architects first, interior design here isn't a bolt-on service.

If your project also involves an extension, a loft conversion or structural changes, the interior is designed alongside the building work from the start, not handed to a separate decorator once the builders leave.

That tends to produce a more coherent result and avoids paying twice for the same thinking.

From Concept To Lived-In

Interior Design Projects We've Delivered

From single-room refreshes to full-house interior schemes, our projects page shows the interior design work we've completed across London and Wimbledon.

Portfolio

The Details That Make It Work

Materials, Lighting And Finishes

We source materials and finishes based on how a space will actually be used, not just how it photographs. A kitchen worktop that survives a busy family versus one for an occasional-use flat calls for different decisions, and that's the kind of judgement we bring to specification, alongside the practical experience of sourcing bespoke joinery and lighting that fits the budget.

What Interior Design Costs

Interior design fees are usually based on either a percentage of the project budget or a fixed fee agreed upfront, depending on the scope of the work.

A single-room refresh costs considerably less than a whole-house scheme with bespoke joinery throughout. We give a realistic figure once we understand what you actually want from the project, rather than a generic number that won't reflect your home.

Why Design United Studio

Jürgen Kuppers and Kirana Laonipon lead interior design projects here as RIBA and ARB registered architects, with Jürgen bringing a decade of experience at Foster + Partners.

That background means interior design at Design United Studio comes with the same spatial thinking used on far larger buildings, applied to your home.

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Our Track Record

2

Hands-On Team

100+

Projects

99%

Planning Approval Success Rate

10+

Years in Practice

What our clients say

Jürgen Kuppers, Kirana Laonipon and the rest of the Design United Studio team have designed interiors for homeowners across London. Here's what a few of them said.

"We assumed interior design meant picking colours. Jürgen completely rethought how our living space actually flowed, and it's a different home now."

"Kirana's lighting design made more difference than any of the furniture we bought. Design United Studio clearly think about a room differently to a decorator."

"They designed our extension and the interior together, so nothing felt like an afterthought once the building work finished."

OLIVIA R.

MARCUS T.

SOPHIE C.

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