The theory is that more stringent building codes reduce property damage during major storms and other catastrophes, and therefore drive down insurance premiums. A recent study by the Texas Windstorm Insurance Association (TWIA) indicates that building codes, when enforced, have an impact on property damage (see here and here). The study reviewed 9,835 residential claims in the aftermath of hurricane Rita and showed: there were far fewer claims reported for dwellings built to the new codes the average paid loss...