The Welsh Office took over the responsibilities related to housing, local government and town and country planning, etc.

A Boundary Commission for Wales was set up under the House of Commons (Redistribution of Seats) Act 1944.

Government departments which had established Welsh offices or units by 1951 included the Ministry of Housing and Local Government, the Ministry of Transport, and the Forestry Commission, and 1951 the office of Minister for Welsh Affairs was created.

It took over, from other departments, functions relating to economic planning, housing, local government, sewerage, environmental health, town and country planning, Welsh national parks, historic buildings, and cultural activities.

That year it was also given responsibility for health and welfare services, and for the use of the Welsh language in the registration of births, marriages and deaths.