Are you curious about whether or not it’s worth it to insulate and heat your garage? Are you worried about building standards that would stop you? There really aren’t any. There are government organizations that will tell you that, if you want an attached garage, the common walls must have specific R-values, and if there is a second-floor room, the ceiling must have a certain R-value for the ceiling, too. As far as the other walls, though? What about the garage door? Nothing! And there are no rules whatsoever concerning a detached garage.