He left a lasting legacy through his eclectic and historicist designs. His work, which evolved from neoclassicism to a style known as “Flemish Renaissance Revival,” had a profound impact on the architectural landscape of Belgium, particularly in Brussels.

Born in Kortrijk to a family of modest means, Beyaert’s fascination with architecture led him to leave his job as a bank employee and become an apprentice stonemason. He later enrolled at the Royal Academy of Fine Arts in Brussels, where he studied under the architect Tieleman François Suys. This academic training, combined with his early practical experience, laid the foundation for his successful career.

Beyaert’s architectural style was characterized by its eclectic nature, often blending elements from different historical periods. His first major public commission, the head office of the National Bank of Belgium in Brussels, was a collaboration with architect Wynand Janssens and showcased a lavish neo-Baroque style. He was also influenced by the work of French architect Eugène Viollet-le-Duc, particularly in his restoration of medieval buildings like the Halle Gate in Brussels.

Among his most notable works are:

• National Bank of Belgium, Brussels (1859–1867): A grand neo-Baroque building that established Beyaert’s reputation.
• Halle Gate, Brussels (1868–1871): A restoration and conversion of a medieval city gate into a museum, showcasing his romantic vision of the Middle Ages.
• “Maison des Chats” (House of Cats), Brussels (1874): This building won first prize in an architectural contest and is known for its intricate facade with cat sculptures.
• Tournai Railway Station (1874–1879): A significant public building that, despite being damaged in World War II, was a testament to his skill.
• Petit Sablon Square, Brussels (1879–1899): An urban design project featuring a small park surrounded by a decorative wrought-iron fence with 48 bronze statues representing medieval crafts.
• Bornem Castle (1883–1894): Renovations and extensions to this historic castle.
• Palace of the Nation, Brussels (1883–1886): A reconstruction and renovation of the Belgian Federal Parliament building.

Beyaert’s influence extended to the next generation of architects, including key figures of the Art Nouveau movement like Paul Hankar and Victor Horta. His legacy is further cemented by the fact that his portrait was featured on the 100 Belgian franc banknote from 1978 to 1994, a tribute to his significant contributions to Belgian heritage.