The renovation of registered buildings with historical monument value and their subsequent adaptation for use is a meticulous process, encompassing three stages: survey, restitution and restoration.

The survey project involves documenting the building’s current condition.

The survey report is a comprehensive document containing photographs of the building, historical documents, historical photographs and researched information about its past. It also includes an explanation of traces, losses and additions for the restitution project, as well as an analysis of the construction system. The survey project is then examined in detail by Board officials.

The restitution project involves modelling the building as it was originally constructed, informed by existing traces and historical documents. In cases where data is incomplete, comparisons are made with similar structures from the same period.The restitution report provides detailed descriptions of all approaches taken.As part of the restitution project, it may be necessary to process various periods of the work. Changes are evaluated and presented to the board for approval.

The restoration project is the project that shows the interventions and repairs to be made. It is based on the survey and restitution, and at this stage the owner’s demands are applied to the building.The structural system, ground problems, today’s comfort expectations and scheme changes are analysed, and solution methods are submitted to the Board for approval.