There can be more than one winner per category, or none, it depends on the ratings the entries received. If several projects in the same category have been graded high by the jury, those projects will be winners. On the other side, if no project made it to the minimum grade to be considered a winner in one given category, there won't be any winner in that category.
We use this system to be fair to all entries, some categories having a large number of entrants and others just a couple.
In addition to the projects awarded in the 41 individual categories, there are three finalists in the disciplines of architecture, interior design, and landscape architecture.