Blame game (Score 1)

Is this a valid analogy? In short, no. A bit longer answer: NOOOOOOO. For a full explanation, read on.

I can't speak to how construction works, but I know how software development and developers work. Usually software breaks not because of a bad developer, but because of integration issues and subtle interactions which are hard to detect, and even harder to assign "blame" to without a lot of investigation. The investigation is generally the hardest part, so you'll have to charge time already spent.

Worse, your boss is proposing a "blame game" where every defect is somebody's fault, almost always somebody on the current development team. Far from encouraging better software, this will keep developers from entering their own bugs (or any bugs) into the bug tracking system, and encourage finger-pointing rather than collaboration. Meanwhile, your boss thinks he'll save money by making developers work for free "on their own time". In the worst case, the person who touched a piece of code is IT, whether it's a legitimate mistake or a weird edge case. What you'll get is a workplace full of egos, fiefdoms ("don't mess up MY code"), and destructive competition.