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Watch The Mayfair Hotel Megabuild online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Claridge's Hotel - icon of old school glamour and favourite of celebrities and royalty - is undergoing its biggest transformation of modern times. Filmed over six years, this documentary series follows the incredible engineering challenges involved in digging out a five storey mega-basement, adding four new floors to the top of the hotel and creating London's most expensive penthouse.