Westminster Palace Renovation: Costs Up to £40 Billion and Duration Up to 61 Years

London – June 16, 2026: The comprehensive renovation of the Palace of Westminster, home to the UK Parliament, faces a major challenge. The National Audit Office (NAO)’s latest report projects the renovation costs to reach up to £40 billion and the duration up to 61 years. These estimates are based on two renovation options currently under discussion.

The first option, “Full Decant,” involves completely vacating both the House of Commons and the House of Lords during the renovation period. This method is expected to take between 19 and 24 years and cost up to £15.6 billion. This allows the work to be carried out more intensively and efficiently.

The second option, “Enhanced Maintenance and Improvement+” (EMI+), includes a phased renovation approach that allows some parliamentary spaces to remain in use during the renovation. This method takes between 38 and 61 years and is estimated to cost up to £39.2 billion. While it enables continued parliamentary operations, the longer construction time significantly increases the total cost.

Regardless of the renovation strategy chosen, the report recommends an initial phase involving approximately £3 billion over up to 7 years. This phase includes the construction of temporary meeting rooms and offices, renovation work on the Victoria Tower, and preliminary restoration work on the medieval Cloister Court.

The NAO report highlights that the Palace of Westminster is experiencing serious structural issues. These include outdated mechanical and electrical systems, fire hazards, and high levels of asbestos contamination. Although £1.5 million per week is currently spent on routine maintenance and repairs, underlying defects remain unaddressed.

A decision on the preferred renovation option is expected to be made within the next few years. The final selection is anticipated to be confirmed by the mid-2030s at the latest. This decision will have a significant impact on the future status of the parliamentary buildings and the direction of the renovation work.

The renovation of the Palace of Westminster is more than just a construction project; it is also a political challenge. Critics demand transparency and accountability in the management of public funds given the high costs and long duration. At the same time, ongoing delays risk causing further cost increases.

The progress and outcome of this renovation project will decisively affect public trust in British politics and major national construction projects. It is important to carefully balance the demands for cultural heritage preservation with the need to meet modern security standards.