On 23 January 2021, the building began to operate as a museum,[4] and currently accept visitors five days a month on selected timeslots.

Major renovation works to the Hôtel Solvay's façade began in March 2022,[5] and its exterior is currently entirely covered in scaffolding.

[6] While the scaffolding was planned to be dismantled in time for the Brussels Art Nouveau Festival in summer 2023,[7] this deadline was ultimately missed; the renovations' current estimated completion date is unknown.

The UNESCO commission recognised the Hôtel Solvay as UNESCO World Heritage in 2000, as part of the listing 'Major Town Houses of the Architect Victor Horta': The four major town houses—Hôtel Tassel, Hôtel Solvay, Hôtel van Eetvelde, and Maison & Atelier Horta—located in Brussels and designed by the architect Victor Horta, one of the earliest initiators of Art Nouveau, are some of the most remarkable pioneering works of architecture of the end of the 19th century.

The stylistic revolution represented by these works is characterised by their open plan, the diffusion of light, and the brilliant joining of the curved lines of decoration with the structure of the building.