The board has established a plan for improvements in the overall environmental performance of the stock, incorporating a series of milestones for example minimum Energy Performance Certificate levels by particular dates, to ensure that steady progress is made towards the ultimate long -term objective of net zero carbon by 2050.  Sufficient resources have been made available to fund the works required and the approach is informed by comprehensive, up-to-date stock condition information.   Where the cost of upgrading properties to an acceptable standard cannot be justified, a range of options are considered, including disposal and replacement with properties constructed to ensure a high level of environment performance.