Already among the country's top visitor attractions, the Dublin storehouse will be hoping to increase numbers even further with the improvements.
An area currently used for exhibitions is to be turned into a 55 square metre connoisseur bar where drinks produced by Guinness parent company Diageo will be sampled.
The council inspector who assessed the plans noted that any alterations which improve the visitor experience are welcome as long as they maintain the "historic fabric and authenticity" of the centuries' old building. Last year, the local authority gave the thumbs-up to more upgrades which made provision for a "perfect pint experience" and a "taste tunnel" and a new window on the fifth floor to give views over the capital.
The Gravity Bar at the top of the storehouse already offers a spectacular city panorama.
The firm received permission to use an undeveloped area for the storage and display of Guinness industrial artefacts.
A council report points out the new proposals were identified as "necessary works required to maintain the ongoing improvement, viability and sustainability" of the storehouse which was originally adapted as a visitor attraction in the 1990s.
Its profile received a worldwide boost in May last year when Queen Elizabeth II dropped by during her official trip to Ireland.
Separately, a €153m redevelopment of the overall site is still on the cards.
Dublin City Council granted Diageo permission for the scheme earlier this year.
Located in the south inner city, the brewery site is bound by Victoria Quay to the north, James's Street to the south, Watling Street to the east and Steeven's Lane to the west.
Diageo plans to consolidate its brewing operations, thereby freeing up space on the south lands and allowing for the redevelopment of Victoria Quay.
The firm has stated: "Diageo's vision represents a major opportunity for Dublin to maintain and upgrade one of the city's most significant historic industries, secure a major employment base and secure community and cultural heritage facilities."