Dunsterhouse. I built one about 3 years ago. Absolutely everything you need in the kit except the roof covering which was perfect for me as I wanted to go for a rubber roof as it was guaranteed for 25 years. Coming back to the Dunsterhouse log cabin, highly recommend them no issues putting it up in a couple of days or so but painting it takes ages. Google them, main factory is in Bedford but they have various outlets. Good solid stuff, no complaints.
@chizel is a good wood worker..... he mainly does roofs.. "I wanted a Shed" ...... "and I said I only do roofs".
Depends on your budget, but certainly worth a look. We have one that we built for the girls to have parties and hangout with friends, but they do more workshop grade versions too. They come and install and takes one week to put the foundations frame in and then another week to build. Lots of sizes available. https://www.thegardenoffice.co.uk/ideas-gallery/ here is their garden studio site https://www.gardenstudio.co.uk/products-and-prices/garden-workshop/
@Billywiztheelder The boarding is tanalised tongue and groove which is watertight if fitted correctly. The one i built previously I put a breathable waterproof membrane around the frame before putting the cladding on top just for belt and braces.
I have one of these but the tandem version, pretty good two man build though. The only fault for me is the roof is low but council planning doesn't allow a higher roof without planning consent. Mines not tanalised as it too large, I paint it every Spring doesn't take long maybe 4-5 hours. I looked at them first at their showroom in Liverpool. https://dunsterhouse.co.uk/premium-...MIptqY5pfP6wIVReR3Ch3fiARdEAYYASABEgKDL_D_BwE
I got a lugarde one from taylorsgardenbuildings 15 years ago. Custom designed for my requirements (doors, windows, height etc). 6m x 3.5m cost 4.5k back then. https://www.lugarde.com/shop/wooden-garage/
Based just down the road from OYB and Tim that’s visits rides a Monster 821 - think you might have a wait though with working from home he said they are flat out