These are the ones I discovered on my first build last year:
Put in twice the amount of ventilation you think you need.
It will cost twice as much as you planned.
It will take twice as long to build as you thought it would.
These are the ones I discovered on my first build last year:
Put in twice the amount of ventilation you think you need.
It will cost twice as much as you planned.
It will take twice as long to build as you thought it would.