Visitors will be guided through several rooms used by the King and Queen by experienced guides in small groups.
The decision aligns with the King's desire to make royal residences more accessible to the public, following suggestions made after his mother’s passing to remember her through opening up the house.
Unlike other royal residences such as Buckingham Palace, Balmoral is not typically set up as a large-scale visitor attraction.
The month-long summer tour program will serve as a trial period to assess how the historic building copes with increased foot traffic.
Previously, only limited areas of the castle, such as the ballroom, grounds, and gardens, were accessible to the public.
The new tours will provide access to additional rooms like the drawing room, red corridor, family dining room, pages’ lobby, and library.
Tickets for the "castle interior tour" are priced at £100, or £150 if including afternoon tea, with 40 tickets available per day.
The tours are scheduled to run from July 1 to August 4 before the annual break of the King and Queen.
This year’s season begins later due to restaurant refurbishments, but if successful, the opening hours may be extended in the future.
Balmoral, famously known as the late Queen's "happy place," was where Queen Elizabeth II chose to spend her long summer breaks, engaging in activities like walking, riding, shooting, and picnicking with her family.
The King has expressed his intent to open more official residences to the public, following the successful public opening of St James's Palace and Buckingham Palace with enhanced festive tours.
The historic Balmoral Castle, purchased for Queen Victoria by Prince Albert in 1852, has been a cherished residence for generations of the Royal Family.
The late Queen Victoria described it as her "dear paradise in the Highlands," a sentiment echoed by her royal successors.
The King aims to continue this tradition of sharing the royal heritage and making these residences, including Balmoral, accessible to the public whenever possible.