A theme-based shared flat (called kot-à-projet or KàP in French) is a concept created by the University of Louvain (UCLouvain) which consists of between six and twelve students sharing a "kot" (student accommodation) and working together on a project. The project lasts for one academic year and can embrace cultural, social or humanitarian activities. There is a total of about 130 KàPs in Belgium gathering more than 1000 students.^[1] Some KàPs have a room reserved for exchange students only.^[2][3]

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Theme-based shared flats were already used in 1972 in Louvain-la-Neuve in Belgium. Louvain-la-Neuve, a university town, was built after the Flemish and Dutch speaking students chased the French speaking students from the original Catholic University of Louvain in Leuven, present-day Flanders. During its creation, the city included the concept of kot-à-projet. In the beginning, these theme-based shared flats were recognized as "student organizations" and were inspired by the (mostly Christian) community houses which existed before the Dutch–French separation. Although mixed-sex accommodations remained officially banned, the university was allowed the theme-based shared flat's occupants to choose their flatmates. For this reason, the theme-based shared flats were the first mixed accommodation in Louvain-la-Neuve.

Most KàPs are not legal associations, but they may organize a non-profit organization. The internal organization is adapted to student lifestyle. Depending on their academic careers, students will generally stay in the same theme-based flat for at most two or three years. Each year, this high turnover has to be compensated for by finding new people interested in taking the lead of the KàP. For this, existing members organize dinners to meet newcomers. Furthermore, to stay alive and continue to prove their utility, KàPs must defend their continued working each year to a commission. This commission is composed of UCLouvain officials and students, it examines the whole year covered by the KàPs, reads the file summary and plans for next year and then decides whether to give the KàPs an additional year on the campus.

All the KàPs are organized around a committee called "the organ". This committee has three main positions: the chair, who is responsible for the KàPs official representations and governs the commission in charge of listening to KàPs defense about their renewal; the treasurer, who receives subsidies from the university and from the municipality and is responsible for redistributing them to the different KàPs; and the external relations manager, who is responsible for coordinating contacts between the KàPs, the University and the City

The different proposed projects of the KàPs are numerous but they can be categorized:

Theme-bases shared flat started in Louvain-la-Neuve but this concept has been expanded to Brussels, Liège, Namur and Mons. In total there are about 130 KàPs in Belgium.