when purchasing a home that requires major renovations what is the 'adeia' exactly. from my understanding you require a civil engineer to do the drawings of the renovations, but what exact is the building permit? can you find out in advance how much the building permit will be before purchasing? is a building permit based on certain criteria? can you be denied a building permit? this is assuming the home is legal but requires work. not building anything extra, just updating. bathrooms, kitchen, floors, roof etc.