Do I need an architect for a house extension?

Not legally, but for anything beyond a small permitted development extension, an architect's drawings are usually needed for planning and building regulations. An architect also helps avoid costly design mistakes before building work starts.

How long does a house extension take from design to completion?

Design and planning typically take a few months. Build time depends on size and complexity, a single storey side return is far quicker than a two storey rebuild.

Can I extend without planning permission?

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

Do I need a party wall agreement for a house extension?

If your extension involves work on or near a shared wall or boundary with a neighbour, you'll usually need a party wall agreement under the Party Wall Act. We flag this early so it doesn't hold up the build once work is ready to start.

Does a house extension add value to my home?

A well-designed extension usually increases a property's value, though the actual return depends on the local market, the quality of the finish, and how well the new space suits the house.

Architects in Morden

Morden sits at the end of the Northern line, and its streets are built to match, tightly packed 1930s semis on plots noticeably smaller than the ones a few stops up the line. Design United Studio, led by director Jürgen Kuppers, designs extensions that make the most of that space rather than fighting its limits.

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Built Around a Terminus, Not a Town Centre

Why Morden Plots Run Smaller Than Neighbouring Areas

Morden was built up quickly around its Underground station in the 1920s and 30s, which means gardens and side returns here are often tighter than in Raynes Park or Wimbledon. That changes the brief.

A design that would sit comfortably on a larger plot elsewhere needs to earn every metre here, so we start from the constraint rather than adjusting for it later.

Morden Hall Park's Snuff Mills and What Bordering It Means

Properties near Morden Hall Park sit next to National Trust parkland built around two historic snuff mills on the River Wandle.

Even where a house itself isn't listed, its setting next to that landscape is something planning officers weigh carefully, and we factor it into a scheme from the first sketch.

Getting the Most from a Compact Morden Semi

Kirana Laonipon, our Part II architectural assistant, designs loft dormers and rear extensions to work hard on a smaller plot, reworking circulation and storage rather than just adding square footage for its own sake.

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Living Beside a National Trust Park

A home backing onto or near Morden Hall Park benefits from that setting, but it also means any extension needs to sit well against parkland that's protected in its own right, not just against a neighbour's fence line.

We treat that as part of the design brief from day one, not a planning hurdle to work around after the drawings are finished.

Working With Merton's Planning Team

Morden falls within the London Borough of Merton, the same authority covering Raynes Park and Colliers Wood, though Morden's applications are weighed against plot size and proximity to Morden Hall Park rather than a conservation area designation.

We prepare each application around what actually applies to that specific property, not a generic borough-wide checklist.

Big-Practice Experience, Small-Studio Attention

A Small Firm That Punches Above Its Size

Design United Studio is led by director Jürgen Kuppers, a RIBA and ARB registered architect with a background in large-scale projects at Foster + Partners, working alongside Part II Architectural Assistant Kirana Laonipon. Morden is one of eighteen areas we cover as part of our wider South West London architects practice. Whoever you speak to on day one is who signs off the finished drawings.

Portfolio

Our Track Record

2

Hands-On Team

100+

Projects

99%

Planning Approval Success Rate

10+

Years in Practice

What Our Clients Say

"Our garden is smaller than most of our friends' in Wimbledon, and I was braced for that to limit us. It didn't feel that way once we saw the plans."

JAMES O.

"We back onto Morden Hall Park and were worried that would mean months of extra red tape. It just meant one extra conversation early on."

"The loft conversion made our house feel twice the size without touching the garden at all, which mattered given how little garden we had to begin with."

CHLOE W.

ANWAR F.

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