Low energy design specialists Accredited Passivhaus Design (APD) are promoting the design of affordable housing to the passive house standard at Ecobuild from 4 to 6 March. According to APD, the passive house approach can reduce rent arrears while reducing the need for off-site allowable solutions as part of compliance with the UK's zero-carbon homes target in 2016. Part of the UK government's proposal for zero carbon homes, allowable solutions permits the counting of carbon credits as a carbon reduction strategy for buildings.