How much to convert a shed into living space?

There's a big sturdy shed at the bottom of our garden and I'd love to turn it into a proper annexe for guests. What kind of costs are we talking?

Asked by Adam on 9th Aug 2026
Expert Trade Answers
"Well it is definitely possible, I would need to take a look to be able to assess the cost.
I would be willing to visit and offer a no obligation quote for the work.
John"
Answered on 12th Aug 2026 - Member since Jul 2026 - report
"Its difficult to be exactly right without a survey, but if you allow £9500 to £14500 this could be a basic good habitable annexe, carried out by a Carpenter and Joiner sole trader type...with the electrical work farmed out to an electrician. This is based on a log cabin effect. More spec finishing like plastering and adding windows would increase the price. Hope this helps"
Answered on 16th Aug 2026 - Member since May 2026 - report
"Hello there

In theory should be quite straightforward, but main concerns obviously around services, building integrity/strength, damp and humidity control, insulation, heating, fenestration and security.

Costs would depend on the size l, services available and proximity to the house. Detailing and finishing quality will elevate the space and give it the feel of an annexe and not a converted shed!

In terms of £/m³ you should be thinking it's easily possible to require £500/m³ especially if your looking for self containment.

Hard to be more accurate without a visit and discussion.

Regards

Hugo Brewer"
Answered on 9th Aug 2026 - Member since Jul 2024 - report
"Hi Adam

I would say in the region of 14k to have it comfortable transformed.

J would happily come and give you a more accurate quote if you like after taking measurements etc.

Thanks"
Answered on 17th Aug 2026 - Member since May 2026 - report
"Hi Adam

You looking at 14k including materials and windows"
Answered on 9th Aug 2026 - Member since Sep 2025 - report
"Hiya it all depends on your exact needs and size , but realistically it should cost 6k+ best bet would be to measure , take a few pics and then a more accurate estimate could be done ."
Answered on 10th Aug 2026 - Member since Aug 2026 - report
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