The unseen deaths are those who are unhoused or unsheltered due to building codes causing elevated building prices. Secondary effects (for those who can afford up-to-code) include less money to spend on healthy foods, good health insurance, quality child education, and other victimized children at the hand of building codes and other regulation.

You can virtually ramp up building codes ad-infinitum, until the house is as safe as can humanly be built, if your expense is to hurt a lot of children by bankrupting families of expenses to take care of other necessities in life.