I totally get that people want to lie to themselves (and therefore everyone else) about the true build costs. Especially if you have justified the project by thinking that self build is a cheaper route to a house.
Also where do you stop when including associated costs? Land, preliminaries, build mortgage, marriage counselling, regular medicine (bottle of Macallan)?
The difference between my lowest, build only and highest, everything I can think of, is probably 40%
Ah, so that's it; 45 C would be much better suited to a heat pump. Do you have to pay a premium for a non-standard PCM?
I agree, although if you don't have an airing cupboard then the compact size might be particularly useful.
Harsh, but uncomfortably fair.
I started out by itemising - and publishing every penny cost on here. Until the unkind remarks came: masked as teasing from the usual suspect.
So, I shut up.
Yours is a understandable standard: '... For myself, every single spend I have that would not have arisen if I wasn't self building is a 'build cost' "
It ain't just as you say '... simple ...' its too simple, too open, too honest, too understandable. Not even a fig leaf behind which anyone can hide.
Many people cant stand too much reality.
In kindness, I think it may be because there so much optimism bias on this board.