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There is no straightforward answer to that question as they are all bespoke....But to give you an idea ours is 7x4.25 meters with a pitched roof of 4 meters high, (semi)soundproofing, partition for toilet, 3.5 meters bifolding doors and 2 extra windows and the DIY kit came at just above 20k....Does not include the slab/foundation and electricity though...If you go for a more common 2.5m high flat roof it brings the cost down significantly.
Aldersbrook-
No planning considerations then?
The variability in price from some of these places is nuts - I've seen ones similar in size to the one I'm looking at, going for 4 - 5 times the price
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Do you have any photos of it so as to give perspective?
Seems like a good way to add space without the issues of approval.
@soul has an amazing one but his was dear if i remember correctly.
NotThamesWater
ChainBreaker
What's the cost of an office garden like their builds?