The West Sussex home of the WI's first chairman and its training college in Oxfordshire are to be relisted on the National Heritage List for England.
Their listings will now mention the WI.
The listed statuses of The Fox Inn in Charlton, West Sussex, where the first WI meeting was held exactly 100 years ago, and for an early WI building in Northumberland are also being updated.
On 9 November 1915 the first meeting of the institute in England took place in the backroom of the Fox Inn. The pub, near Goodwood, is now called the Fox Goes Free and the room where the meeting was held is known as the Hat Rack Bar.
The Fox innkeeper at the time, a Mrs Laishley, was a founder member of the Women's Institute.
The National Heritage List for England gives protection to the most important parts of the country's building heritage.
The four buildings were already listed, but now their links to the WI will be included in their descriptions on the National Heritage list.
Balcombe Place in West Sussex was the home of the WI's first chairman, Lady Gertrude Denman, from 1905 until her death in 1954.
Marcham Park, in Oxfordshire, later renamed Denman College, was the WI's first training college and taught skills such as butchery and garage work.
Also to be relisted is the Mechanics Institute in Newbrough in Northumberland. The building was given to the local WI in 1948 and talks, including on how to truss a fowl or re-upholster chairs, were given there, the Fourstones and Newbrough website says.
Baroness Neville-Rolfe, the Culture, Media and Sport Minister, said: "Since their first meeting in England in 1915, the WI has become a much-loved British institution.
"I am very pleased to relist these special places and preserve the historic significance of this extraordinary social movement."
Esther Godfrey, listing adviser at Historic England, said: "These four buildings tell the story of the formation and development of the WI in England from a small meeting in the back room of a pub to a thriving national institution."
Four buildings with links to the Women's Institute are to be recognised to mark the organisation's centenary.