CHBA is urging builders to participate in a National Research Council survey on changes to step dimensions for the 2020 National Building Code. With the increase to a 10 in. tread in the 2015 Code yet to be adopted in some jurisdictions, proponents are already calling for a further increase to 11 in., along with a decrease in rise to a maximum 7 in. from the current 8 in. If adopted, the proposed change would present significant design challenges and further affect housing affordability and choice.