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16 hotels in London hold Green Key certification. Each one is audited by an outside body, on a schedule it does not set itself.
Wikimedia CommonsSheraton Grand London Park LaneSheraton Grand London Park Lane is a prominent hotel situated in Piccadilly, London, United Kingdom. Housed in a notable Art Deco building, the properIndependently certified
The GATE Aparthotel LondonA design-led aparthotel located in the Whitechapel district of London. It offers modern serviced suites with kitchen facilities, combining hotel serviIndependently certified
Wikimedia CommonsAloft Excel LondonAloft Excel London is a hotel in One Eastern Gateway, UK. The name does not clearly indicate a major chain, and the listing includes links for online Independently certifiedThe DillyA historic luxury hotel on Piccadilly in central London, featuring traditional British elegance and grand public spaces.Independently certified
London Marriott Hotel Grosvenor SquareHigh-end London Marriott on Park Lane, oriented toward luxury city stays with a prime central location.Independently certified
Crown Plaza London EalingUpscale hotel in the Ealing district of London. Positioned for business and leisure access along the Western Avenue corridor.Independently certified
Wikimedia CommonsMontcalm EastMontcalm East is a contemporary upscale hotel on City Road in the Shoreditch area of London. It is positioned for guests who want quick access to the Independently certifiedW Hotel LondonW Hotel London is a luxury lifestyle hotel located in Leicester Square. As part of the W brand, it emphasizes contemporary design and an urban experieIndependently certifiedThe Westminster London, Curio Collection by HiltonThe Westminster London, Curio Collection by Hilton is located on John Islip Street in the City of Westminster, London, United Kingdom. Situated near tIndependently certified
Wikimedia CommonsLondon Marriott Hotel County HallLondon Marriott Hotel County Hall is situated in the historic former headquarters of the London County Council on the South Bank. Overlooking the RiveIndependently certifiedJW Marriott Grosvenor House LondonJW Marriott Grosvenor House London is a landmark hotel located on Park Lane in Mayfair, London, United Kingdom. Overlooking Hyde Park, the property isIndependently certified
Wikimedia CommonsStrand Palace HotelStrand Palace Hotel is located on the Strand in the heart of London, United Kingdom. Situated near Covent Garden and the West End theaters, it provideIndependently certified.jpg&w=3840&q=75)
Wikimedia CommonsLondon Marriott Regents ParkLondon Marriott Regents Park is situated on King Henry's Road, providing access to Regents Park and Primrose Hill in London, United Kingdom. This cityIndependently certified
Wikimedia CommonsDoubletree by Hilton London Hyde ParkDoubletree by Hilton London Hyde Park is located on Bayswater Road, directly overlooking Hyde Park and Kensington Gardens. The hotel provides contempoIndependently certifiedInhabit Hotel (Southwick Street)Inhabit Hotel on Southwick Street is a wellness-focused establishment located in Paddington, London, United Kingdom. Characterized by its minimalist dIndependently certifiedThe SavoyThe Savoy is an iconic luxury hotel located on the Strand in London, United Kingdom. Opened in 1889, it is famous for its association with historic fiIndependently certifiedGreen Key audits a hotel against roughly 100 criteria, some mandatory and some scored, covering water and energy use, waste separation, cleaning chemicals, food sourcing and staff training. A hotel applies, documents each criterion, and is then visited on site. Certification runs for one year, so a hotel keeps it only by re-submitting evidence and passing another visit. It is the largest scheme in this catalogue and the one you will meet most often across Europe.
Green Key measures management practice, not carbon. A large hotel with a pool and air conditioning can hold the certificate while using far more energy per guest than an uncertified guesthouse down the road — it is being judged on whether it manages its resources deliberately, not on the size of its footprint. The scoring is also weighted towards documentation, so a hotel with good records can outscore one that quietly does better.