Royale Belge

Client: Souverain 25 NV
Location: Brussels
Surface: 39.174 m²
Timing: 2020
Status: finished - with the exception of fire advice

Technical advice I Façade engineering
Technical advice I EPB

The building of the former Royale Belge, which was used by AXA until 2017, is an emblematic monument from the 1970s with its most striking features being the orange windows and the corten steel frame. 

Bureau Bouwtechniek was contacted by the owner of Royale Belge to provide an overview of the building and to carry out a feasibility study with a view to converting the office building into a complex for mixed use: a hotel, coworking rooms and a fitness and wellness centre, while respecting the property value of the building.

Bureau Bouwtechniek was responsible for the following advice:

  • Destructive investigation and roof advice  
  • Daylight advice and glass advice, taking account of the heritage value and special properties of the original glazing 
  • EPB and building code analysis   
  • Fire advice  
  • Destructive testing (in collaboration with Grove+) and facade detail advice 

EPB advice and reporting
BB is responsible for the EPB advice during the design phase (and further reporting during execution and after delivery) and the integrated feasibility study. 

The feasibility study will examine the possibility of pursuing passive construction for the renovation of the building, in addition to using renewable energy sources. For the offices in the tower, a dynamic simulation is carried out, in which different building envelope measures (insulation of façade, choice of glazing) are examined. Prior to this, a thermal analysis of the opaque façade is carried out.


Building node analysis
A thermal analysis is carried out for the facade of the tower, the concrete structure under the tower and the roof structure of the former restaurant. The energy performance is investigated for different insulation scenarios, including the risk of surface condensation and/or mould growth.


Team BB: prof. arch. Jan Moens, arch. ass. Tuur Van Dijck, ing. Martijn Vyncke, ir. arch. Robbe Verelst, ir. arch. Nadja Van Houten, arch. Raf De Preter