Building Digital UK

Building Digital UK (BDUK) is a unit within the Department for Science, Innovation and Technology (DSIT) responsible for rolling out broadband and mobile coverage to hard-to-reach (often rural) places across the United Kingdom. It was originally established as an executive agency, but was integrated into DSIT, along with a number of other digital delivery bodies, on 1 November 2025.

BDUK work to improve broadband and mobile connectivity in partnership with private companies, with the government subsidising private companies capital costs, so they can provide services such as broadband in areas that would otherwise be commercially unviable. The networks remain owned and operated by private companies, with BDUK responsible for certain governance and compliance. BDUK works to deliver two programmes, Project Gigabit (Broadband) and the Shared Rural Network (4G).