Garden Workshop Recommendations?

[timbob]

I’m planning on putting up a timber garden room/workshop to create some extra space - bike storage, racking for bits and bobs and a decent workbench down one end. It’s going lengthways down the side of the garden, rear wall towards the fence with next door so I’m aiming for something approx 8ft/2.5m deep and perhaps 18-20ft/5.5m-6m in width. I’ll put a proper concrete slab down for it to sit on.

I’m really after a DIY kit type building and relatively decent quality is a must. A friend put up a Dunster House building a couple of years ago which seems decent quality - 45mm thick tongue and groove walls etc. There appear to be various options available on their website in the £3-£4k range which is about my budget for the building.

I am aware I could probably bulk buy some CLS timber and design and frame myself something, but sourcing doors/windows and starting from scratch isn’t really on the menu currently - two young kids and work means time is at somewhat of a premium - I’d rather spend a little more and get something pre-designed, pre-cut and with an instruction book!

Are there any other options for a timber built garden workshop anyone could point me towards? Any personal experience or recommendations would be valuable.

Thanks in advance!