The “microfinance of housing” is an emerging and promising practice among microfinance institutions (MFIs). Housing microfinance merges elements from microenterprise finance and traditional housing finance (e.g., mortgages). Rather than financing the purchase or construction of a complete house, these loans are used to help poor families build incrementally, through a process commonly known as progressive build. A household’s first loan might replace temporary scrap wood walls with cement blocks; a second loan might replace a worn zinc roof with reinforced concrete, and a third might add an additional room. Among ACCION International’s Latin American partners, seven organizations have housing loan portfolios with a combined total of more than $30 million in the outstanding portfolio and 15,000 active clients.