A tiny bit more expensive with SIP's, but a 5 times better build & a lot quicker than making it out of studwork. My vote is for Mrrusty. I just put up a 9x6 shed compleatly built by me & cost was around £1300 with concrete base & a shiplap finish.
Are you dry lining/plastering any of it or is it literally a wooden (ship lap type) shed with the usual air gaps all over? If the latter, probably ok apart from pipe lagging etc as said. If the former, it’s not going to go well, mouldy damp plastered surfaces/interior timber etc…
Are you dry lining/plastering any of it or is it literally a wooden (ship lap type) shed with the usual air gaps all over? If the latter, probably ok apart from pipe lagging etc as said. If the former, it’s not going to go well, mouldy damp plastered surfaces/interior timber etc…
You need insulation AND heating anywhere that involves water or a fridge.
I'm currently building an outside toilet. It has insulated brick cavity walls, loft insulation and an insulated floor. It also will have an electric towel rail, which has an automatic frost protection thermostat. It will almost never switch on, but in the depths of winter it will click on if below about 6 degrees to prevent ice forming anywhere.
If it has multiple rooms then you could only heat the rooms that include water or a fridge. You'll then need insulation between the heated and unheated rooms, or at the very least to build this wall from brick or block, not just a bit of plasterboard.
You need a fundamental re-think, you can't just lob water into a standard shed and think all will be well - you'll end up with a flooded mess in the first winter. You need to treat this essentially the same as building a house. If that's beyond your abilities or budget then just don't do it at all.
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