Who we are History 1941-1951

1941-1951: Inventor and entrepreneur

1947: Our founder Villum Kann Rasmussen (KR) Demonstrates how easily a person can exit trough a VELUX roof window Type N

Inventive entrepreneur fills loft spaces with daylight and fresh air

With materials in short supply in wartime Denmark, Villum Kann Rasmussen developed the first VELUX roof window that would transform dark attics into domestic spaces.

In 1941, the young engineer Villum Kann Rasmussen established his company V. Kann Rasmussen & Co in Copenhagen.

One of his first commissions was to supply roof windows to a number of school buildings, in which loft space was being converted into classrooms. The shortage of materials during the war led Villum to come up with an idea that would transform those dark empty attics into bright living spaces – full of daylight and fresh air.

His vision was “to make a skylight - a roof window - that is just as good as the best vertical window”.

Villum’s first roof window was patented in 1942. He called it VELUX – ‘VE’, from the word ‘ventilation’ and ‘LUX’, from the Latin word for ‘light’. VELUX roof windows proved to be an effective way of putting many square metres of wasted roof space to good use. Post-war demand for VELUX roof windows increased significantly, and the young company’s prospects looked bright. Villum’s belief in a fair deal, high quality standards and ongoing technical innovations and improvements was key to his success.