The heritage site will honour Diana with a “memorial tablet” and they will announce the location of the plaque later this year.
Diana’s Earl’s Court flat is believed to be the address picked by the charity.
The late Princess of Wales will become the highest-profile former member of the Royal Family to be given the honour, having been nominated by the London Assembly after it ran a campaign asking Londoners to suggest women worthy of a blue plaque.
Anna Eavis, English Heritage’s curatorial director, said the princess’s campaigns to highlight issues such as HIV/Aids led to the decision to mark the London residence.
Princess Diana’s life is set to be commemorated through a special honour
Diana pictured leaving her flat in November 1980
She said: “Her profile and popularity remains undiminished nearly 25 years after she died and clearly a part of that was the ease with which she seemed to communicate with everybody.
“I think what appealed to the panel when they were considering her nomination was she’s undeniably a significant figure in late 20th century Britain, with a close London association obviously.
“She did undeniably play an important role in destigmatising HIV/Aids and also towards the very end of her life campaigned in those anti-landmine campaigns which was also very important.”
Diana moved into the flat, in Coleherne Court in Knightsbridge, shortly after her 18th birthday.
English Heritage will honour Diana with a “memorial tablet” of her own
Her parents reportedly purchased the property for just £50,000, with flats in the block now selling for over £1.4million.
Diana lived at the flat with two of her friends and charged them £18 a week.
The late royal is said to have described her time at the flat as “the happiest time of her life,” according to Andrew Morton’s book Diana, In Her Own Words.
She said: “It was juvenile, innocent, uncomplicated and above all fun. I laughed my head off there.”
Diana lived at the flat for about two years
Diana left the flat in February 1981, the night before her engagement to Prince Charles was announced.
The couple married later that year, on July 29.
During her time as a senior royal, Diana helped shine a light on a number of issues and has been credited with changing public attitudes to HIV/Aids.
She publicly challenged the misconception the illness was highly contagious, after being pictured shaking hands and touching patients diagnosed with HIV/Aids.
For years she fought to end the stigma surrounding the illness, which mainly affected male homosexuals.
The blue plaque will recognise Diana’s significant contributions and will coincide with wider celebrations for the late royal this year, in what would have been her 60th year.
Her two sons Prince William and Prince Harry are due to unveil a new statue in the garden of Kensington Palace on July 1, her birthday.
The statue was commissioned by the princes in 2017 to mark the 20th anniversary of their mother’s death and to “recognise her positive impact”.
In August it will be 24 years since Diana was killed in a car crash in Paris.
Source: EXPRESS CO UK