The 5th edition dramatically expands wheelchair turning circles (now 150 cm / 59 inches minimum), counter heights for standing and seated users, and tactile guidance systems for the visually impaired. Old editions placed "disabled access" as a footnote. The 5th edition treats it as a primary design driver.
The 5th edition was published in (translated from the German 41st edition). It is still in copyright globally. The 4th edition (2000) is also copyrighted but sometimes appears in older university library scans – still not legal to redistribute, but institutions may provide access. neufert architects 39 data 5th edition pdf top