New owners Ennismore said the project will make the most out of the hotels "rich heritage".
Features include bedroom enhancements with new detailing, fabrics and craftsmanship, along with creating additional spaces for guests throughout public areas in the hotel.
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A new bar will also be created in the Dormy Clubhouse, while the hotel's main bar will be refurbished.
Ennismore CEO, Sharan Pasricha, said: "We really want to showcase the unrivalled range of facilities – the glorious playground of country pursuits and activities – we offer on the estate.
"We're approaching the refurbishment with bold and creative decisions while respecting the hotel's history and building on its remarkable heritage."
Mr Pasricha added: "We look forward to introducing our guests to the new spaces and continuing to provide them with a five-star experience in a setting that is effortlessly stylish and luxurious."
(Image: Gleneagles Hotel)
(LM)
