Insulation and smoke alarms are compulsory in rental properties but a bill before the Government Administration Committee aims to toughen up regulations even further.
Labour leader Andrew Little's Healthy Home's Guarantee Bill (No2) passed its first reading a year ago - the first Healthy Home's Guarantee Bill under Labour MP Phil Twyford's name failed to pass its first reading in March of 2015.
Read how a bill becomes law here.
Mr Little's Bill would require rental properties meet a minimum standard of heating, ventilation and drainage but healthy home advocates have told the committee the bill needs "more carrot" to lure landlords to its side.