A family member bought a plot, some blueprints for a two-story house from an architect firm and hired someone to build it.
Well into the construction, the builders asked if he would like them to raise the roof of the building by one meter, as it would be a negligible increase in cost.
He was going to reject the offer but changed his mind and accepted.
Once completed he realized that if he had rejected the offer, he wouldn't be able to use the second floor at all. The house had a Gable-style roof[1], and the stairs a U shape along one of the outer walls. Had he not raised the roof, one couldn't have walked up the stairs due to the roof being so low along the outer walls. Even after raising the roof, tall people would still need to tilt their heads going up.