The iconic ship will spend 25 days dry-docked at the Blohm+Voss Shipyard in Hamburg, Germany next summer for the refit.
Three of the key refurbishments include the introduction of 15 single staterooms for those travelling alone, 30 additional Britannia Club balcony staterooms and a further ten kennels for dogs and cats.
Richard Meadows, president of Cunard North America, said: “Queen Mary 2 is an icon in the world of luxury ocean travel. A ship that turns heads everywhere she goes, she is the pride of the Cunard fleet and we are committed to ensuring her reputation grows ever stronger.
“These enhancements are just the beginning of an exciting refurbishment for Queen Mary 2, and we look forward to making more announcements about this impressive refit in the coming months.”
The additional accommodation is now on sale for Queen Mary 2 summer sailings from late June 2016.
In March, Cunard announced details of its 2016 main programme of cruises for sailings between May and December as part of its 175th anniversary celebrations.
The schedule includes calls at 34 countries, including five maiden calls, for Cunard’s Queen Mary 2, Queen Victoria and Queen Elizabeth. The five maiden calls are: Gaspe (Canada), Genoa (Italy), Pointe-a-Pitre (Guadeloupe), Saguenay (Canada) and Stornoway.
Other highlights of the programme include overnight stays in Boston, Reykjavik, Istanbul, Quebec and Venice among others.
Further information about Cunard and Queen Mary 2 can be found at cunard.co.uk