After the Great War ended in 1918, the city council decided to build modern housing across the city to rehouse families from inner city slums. Recent boundary expansions which brought areas including Aston, Handsworth, Erdington, Yardley and Northfield within the city's boundaries provided extra space for housing developments. By 1939, the year that the Second World War broke out, almost 50,000 council houses had been built across the city within 20 years. Some 65,000 houses were also built for owner occupiers. New council estates built during this era included Weoley Castle between Selly Oak and Harborne, Pype Hayes near Erdington and the Stockfield Estate at Acocks Green.