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How long does a house extension take?

A realistic timeline from the first drawings to handing over the keys, and the things that most often cause delays.

People usually ask how long the build takes. The honest answer is that the build is only part of it. Drawings, planning, building control and party wall notices often take longer than the construction itself. Here's a realistic picture.

Before anything is built

Realistically, allow three to four months from first drawings to starting on site if planning is needed, and less if it isn't.

The build itself

That covers groundworks, foundations, walls, roof, windows, knocking through, electrics, plumbing, plastering and finishes.

What causes delays

How to keep it on track

Get drawings, approvals and party wall notices done early, ideally over the winter, so you can start building when the weather improves. Our guide to the best time to build an extension covers this in more detail.

This is general guidance, not formal advice on your property. Rules change, so we check the current position at the free site visit and handle any applications as part of the job.

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Next steps

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Questions we get asked

Straight answers. No jargon.

How long does a single-storey extension take to build?

Typically 8 to 12 weeks on site, plus time beforehand for drawings and approvals.

How long does planning permission take?

The target for householder applications is 8 weeks from validation. Many single-storey extensions are permitted development and don't need it.

Can I live at home during an extension?

Usually, yes. The disruption is greatest when we knock through to the existing house, which we plan carefully.

What's the most common cause of delay?

Waiting for approvals and trades. Having every trade in-house removes the second.

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