One room is freezing. Another overheats. Upstairs feels completely different to downstairs, and the heating never seems to catch up.

The important thing to understand is this: building cost blowouts are rarely random. Here’s where cost overruns in building projects actually come from and how to avoid them.

A few years ago, when we mentioned Passivhaus to clients, we’d usually get a blank look. Now it’s one of the first things people ask us about.