What sort of size are you after?
If it's only two or three meters on a side then I'd build it yourself. That way you get something ridiculously overbuilt and exactly what you want for a reasonable cost.
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I'm about to embark (see what I did there...) on a building my own shed/tree-house. Mainly because I wanted a tree-house and then realised I'm in dire need of some bike / garden furniture storage. So I plan to build a basic shed, next to my Bramley apple tree, with a tree house sitting on top.
So far I've dug out the floor for a traditional decking. (Loads of videos on YouTube for this.) I then dug x6 holes and put 1/2 a breeze block in them. Then I used post-concrete to secure x6 wooden uprights for the decking frame (i.e. a rectangle of wood) to be attached. In summary, I built a decking floor.
In the future, I plan to begin making high stud walls next and then a sloping roof. To sort of build a multi-story structure: bike shed and tree-house. I'm also thinking of finding free pallet wood to cover the whole thing in shingles and make it water tight; although I might just buy from B&Q to save time. I could put a few photos up if anyone is interested?
Whereabouts are you? I got one from my local shedshop, was restricted by the amount of space I had so went for a 6ft x 4ft, but there is quite a bit of wiggle room there depending on the quality you want. I got a discount because it was coming to the end of shed season. Who knew sheds had seasons?
Just a thought. Remember to check if you need planning permission. Size, height, position near boundary, listed building, conservation area, etc can all have a bearing.
/\ good point :) thanks Flibb
https://www.planningportal.co.uk/inf...3/outbuildings
think this is all ok... it's behind my house
Got a 6x8' workshop from Shedmonkey - aside from the novelty sized key it all seems fine. 12mm Shiplap so reasonable, and upgraded to the glass windows which is nice. Over £500 atm but we paid less from memory. Added some laminate flooring removed from the house, an old kitchen worktop, a set of shelves and just added some more shelves directly on the frame. Still standing! Tried to get one from a local place but lead time was too long.
With the old shed in the house being really old, I didn't realise how low 'normal' modern sheds were and needed to go for a 'workshop' so I could stand up in it. Not huge at 6x8' but enough space for car bits and gardening bits with everything tidied away and a worktop down most of one side for working on.
Main thing that people fall foul of is height when the shed is near a boundary (within 2 meters).