This is my workspace - I'm a professional writer, so it's a writing shed. We ran out of space in our cottage, and I needed a dedicated workspace. It's small (7' x 5') - partly for practical reasons (cost, purpose, and the space where we wanted it to go), and partly to encourage concentration once I'm inside! It has a bookcase, a couple of shelves and a fold-out table. Two people can sit at the table, I keep a spare stool for visitors. I painted it white inside to maximise the feeling of space and light, with some carefully chosen artwork and other features. We carpeted it so it feels more like a room than a shed.
It's fully insulated (zero damp!), and runs electricity off the house (with a separate external safety switch to completely disconnect when not in use), and has an ethernet cable - my partner did all this. I have an electric heater in there at the moment, and my partner is working on an eco-alternative.
It gets really cosy, and I only need the heater on for a few minutes.
It came with a double window along one side, and my partner added another single window at the end. I use it every day - we only finished it in December, and already I've written so much in there! I've also given Zoom workshops, poetry readings and tarot readings from the shed - it's a magical space!
We bought the shell of the shed, then my partner fully insulated it, and we painted it.
We have a stony area at the side of the house - and we laid down some old fence-posts to create a base, so the groundwork was pretty easy.
My partner did all the construction. He also made the half-moon table which folds out from the wall.And a corner shelf from the offcuts of the table.
We were lucky to get the perfect grey carpet offcut.
I added the rest - bookcase, chair, lamp, other features. Rope lights (plus a table lamp) make the most of lighting the whole space.
I deliberately didn't want to cram it full of things, so that it never feels untidy or small.