porches enclosed by wrought iron bars

Are floor to ceiling wrought iron bars legal to enclose a porch? like so: https://www.google.com/maps/@40.644054,-73.9459419,3a,37.5y,270.82h,91.2t/data=!3m6!1e1!3m4!1s4YTdIKTKdIkpHZJDtdg7JA!2e0!7i13312!8i6656 Does one need a permit for that? Does it affect FAR? Does it affect building Sqft? Fire code?