Which rules and principles determine whether adding extra floors to existing buildings is possible in Rotterdam? What ambitions must be met in order to make a rooftop extension initiative successful? This presentation explains the Kader Optoppen.

The Kader Optoppen provides clearer guidelines and expectations for a specific group of rooftop extension initiatives. This makes the process more transparent and predictable, helping to shorten procedures and reduce the workload for both initiators and the municipality.

Using practical examples, we demonstrate how the framework works and the role rooftop extensions play in the broader strategy to make better use of Rotterdam’s existing housing stock.