So i'll reply in here instead.
From the start, its a 18ft x13ft summer house that externally is composite. It has a wooden frame and is waterproofed with membrane.
The electrics, it has a 6mm armoured core going from my home to the RCD you can see in the top right corner, i opted for kingspan membrane for inside the walls and paid for an extra 5 sockets(total 7 double sockets) and 4 spots in the cieling.
I have a UPVC double glazed double door and window.
I paid for the thicker flooring so i t adds more stability and the joists underneath are all battened at 1 foot apart to give it extra strength.
The base, my garden was all levelled and porcelain flagged a couple of years ago so no work required there.
I would say in total including the upgrades and the electrician hooking it up to my house its cost around 17k.