After adopting legislation in 2009 to support secondary suites, Vancouver, British Columbia has become a leading city of their construction in North America. In the city, approximately a third of single-family houses have legally permitted ADUs. The Housing Policy Branch of British Columbia's Ministry of Community, Aboriginal and Women’s Services published a guide for local governments to implement secondary suite programs called 'Secondary Suites: A Guide For Local Governments'. The current issue is dated September 2005. The intent of the guide is to "help local governments develop and implement secondary suite programs". It also highlights good secondary suite practices as well as providing practical information to "elected officials, planners, community groups, homeowners, developers, and others interested in secondary suites".