Originally built in Romanesque style like the St Basil chapel, the upper chapel was transformed in Gothic Style at the end of the 15th century and again in 1823.
Only the curved arches giving access to the side chapel of the Holy Cross remain from the original Romanesque chapel.

The monumental staircase, commonly named De Steegheere, which leads to the upper chapel, was built in from 1529 to 1533 in late Gothic and Renaissance style according to the drawings of Flemish painter and architect William Aerts, ornamented on the outside with sculpted statues.
The aftermath of the French Revolution left the staircase badly damaged and it was decided in 1832 to move it 4 metres (13 ft) backwards and to rebuild it after removing the remaining ruins of the Oud Steen.
The gilded bronze statues represent Archduchess Isabelle of Burgundy, Mary of Burgundy, Thierry of Alsace and Philip of Alsace and, in the medallions, the Archdukes of Austria Albert VII and Maximilian III, Margaret of York and Sibylla of Anjou, wife of Thierry and daughter of King Fulk of Jerusalem.

During the 19th century, successive renovation campaigns gave to the chapel its final Gothic Revival aspect, with its characteristic mural decorations.
The stained-glass windows in the choir date from 1845 and represent the sovereigns who reigned over the County of Flanders from Philip the Bold, duke of Burgundy, till Archduchess Maria Theresa of Austria, Holy Roman empress.

The following architects and artists took part in these neo-Gothic renovations of the Chapel of the Holy Blood:
Jean-Baptiste Bethune
Louis Delacenserie
Thomas Harper King
William Curtis Brangwyn, father of Frank Brangwyn
Charles De Wulf, architect of the city of Bruges and winner of the Prix de Rome in 1887
The pulpit in the form of a globe was made in 1728 by Henry Pulinckx, inspired by its evangelical purpose : "Go into all the world and preach the gospel" Mark 16:15.

The large wall-painting behind the high altar was realized in 1905.
In the upper part, the Mystery of the Cross depicts Christ shedding his blood, with, in the background, the towns of Bethlehem, where Christ was born, and Jerusalem where he died.
The lower part depicts the transport of the relic from Jerusalem to Bruges: on the left, Thierry of Alsace receives the relic from Baldwin III of Jerusalem, King of Jerusalem ; on the right, kneeling besides Countess Sibylla of Anjou, he hands over the relic to the chaplain.

The high altar used today for the Eucharist is decorated with a relief in alabaster from the beginning of the 17th century depicting the Last Supper.
Typical attributes of a basilica, the tintinnabulum, the small processional bell, and the Umbraculum, the sunscreen in the form of a parasol in yellow and red silk, are displayed next to the high altar.

Laurent Delvaux completed in 1751 the white marble altar in Baroque style for the relic side chapel.
The two adoring angels were made by Peter Pepers.
The relic is kept in a magnificent silver tabernacle made by local silversmith François Ryelandt (1709–1774), representing the "Lamb of Christ".
To the right of the altar, the painting of Jacob van Oost depicts the descent from the Cross.
The relic is shown to the public every Friday and every day two weeks before Ascension Day.
Originally built in Romanesque style like the St Basil chapel, the upper chapel was transformed in Gothic Style at the end of the 15th century and again in 1823. Only the curved arches giving access to the side chapel of the Holy Cross remain from the original Romanesque chapel.
The monumental staircase, commonly named De Steegheere, which leads to the upper chapel, was built in from 1529 to 1533 in late Gothic and Renaissance style according to the drawings of Flemish painter and architect William Aerts, ornamented on the outside with sculpted statues. The aftermath of the French Revolution left the staircase badly damaged and it was decided in 1832 to move it 4 metres (13 ft) backwards and to rebuild it after removing the remaining ruins of the Oud Steen. The gilded bronze statues represent Archduchess Isabelle of Burgundy, Mary of Burgundy, Thierry of Alsace and Philip of Alsace and, in the medallions, the Archdukes of Austria Albert VII and Maximilian III, Margaret of York and Sibylla of Anjou, wife of Thierry and daughter of King Fulk of Jerusalem.
During the 19th century, successive renovation campaigns gave to the chapel its final Gothic Revival aspect, with its characteristic mural decorations. The stained-glass windows in the choir date from 1845 and represent the sovereigns who reigned over the County of Flanders from Philip the Bold, duke of Burgundy, till Archduchess Maria Theresa of Austria, Holy Roman empress.
The following architects and artists took part in these neo-Gothic renovations of the Chapel of the Holy Blood:
Jean-Baptiste Bethune
Louis Delacenserie
Thomas Harper King
William Curtis Brangwyn, father of Frank Brangwyn
Charles De Wulf, architect of the city of Bruges and winner of the Prix de Rome in 1887
The pulpit in the form of a globe was made in 1728 by Henry Pulinckx, inspired by its evangelical purpose : "Go into all the world and preach the gospel" Mark 16:15.
The large wall-painting behind the high altar was realized in 1905. In the upper part, the Mystery of the Cross depicts Christ shedding his blood, with, in the background, the towns of Bethlehem, where Christ was born, and Jerusalem where he died. The lower part depicts the transport of the relic from Jerusalem to Bruges: on the left, Thierry of Alsace receives the relic from Baldwin III of Jerusalem, King of Jerusalem ; on the right, kneeling besides Countess Sibylla of Anjou, he hands over the relic to the chaplain.
The high altar used today for the Eucharist is decorated with a relief in alabaster from the beginning of the 17th century depicting the Last Supper. Typical attributes of a basilica, the tintinnabulum, the small processional bell, and the Umbraculum, the sunscreen in the form of a parasol in yellow and red silk, are displayed next to the high altar.
Laurent Delvaux completed in 1751 the white marble altar in Baroque style for the relic side chapel. The two adoring angels were made by Peter Pepers. The relic is kept in a magnificent silver tabernacle made by local silversmith François Ryelandt (1709–1774), representing the "Lamb of Christ". To the right of the altar, the painting of Jacob van Oost depicts the descent from the Cross. The relic is shown to the public every Friday and every day two weeks before Ascension Day.
Basilica of the Holy Blood