In the wool towns of Yorkshire three families built villages for their workers. In each, there was a hierarchy of houses: long terraces for the workers, larger houses in shorter terraces for the overlookers, semi-detached houses for the junior managers, and detached houses for the elite. The first such village was built by Colonel Edward Ackroyd, at Copley, West Yorkshire, between 1849 and 1853, the second by Sir Titus Salt at Saltaire (1851–1861), and the third was the West Hill Park Estate in Halifax built by John Crossley. Model villages in Lancashire followed, with developments like Houldsworth Village. Semi-detached housing in colliery villages was rare; status here was determined by the length of the terrace.