The urban district boundaries were enlarged several times, notably in 1930 when it absorbed areas including Langley and Cippenham.

It was replaced by a slightly larger non-metropolitan district of Slough, which covered the old borough plus the Britwell and Wexham Court areas, and was transferred from Buckinghamshire to Berkshire.

There are three civil parishes in the borough at Britwell, Colnbrook with Poyle, and Wexham Court, which form an additional tier of local government for their area.

[11] Political control of the council since the 1974 reforms has been as follows:[12] Lower-tier non-metropolitan district Unitary authority The role of Mayor of Slough is largely ceremonial.

[24] On 2 July 2021, Slough Borough Council issued a notice under Section 114 of the Local Government Finance Act 1988, having the effect of preventing any new expenditure on non-statutory services, after serious financial problems had been identified.

[25] In October 2021, the government announced plans to appoint external commissioners to help run the council after a series of reports highlighted major problems at the local authority.

[32][33] In February 2025, the Council announced it was putting the St Martin's Place office complex up for sale.