Housing intensification is important because it fosters more housing variety in areas with access to jobs, transport, and community facilities. It also makes the best use of existing infrastructure, amenities, and services like public transport, and bolsters the efficiency case in more investment in this critically needed infrastructure. It also helps to address climate change through changing transport modes to meet our emissions targets. Cost benefit analysis by PricewaterhouseCoopers on the NPSUD intensification policies found that 72,000 additional houses can be expected by 2043 in the tier 1 urban areas of Auckland, in Greater Hamilton, Tauranga, Wellington, and Christchurch. PricewaterhouseCoopers now considers this to be a conservative estimate.