Danish Inventor Brought Us the Roof Window Skylight

Thousands of Canadian homes are brighter, airier and more inviting today because of the life’s work of an inventor and entrepreneur born in 1909 on the obscure Danish island of Mando.

attic_loft_ladies_skylight_roof_windowThis man’s name was Villum Kann Rasmussen and he’s the father of what’s known today as the ‘roof window’. He coined this phrase way back in 1941 to describe a skylight that you can open for fresh air. This then-novel combination of ventilation and light led to the brand name of the worldwide company that Rasmussen founded – VELUX.

If someone makes a better roof window than these guys, I’ve never seen it. The fit-and-finish, the hardware and the innovative features all stand out as obviously first-rate. And like most success stories, these qualities ripple out from the sentiments of the person who started it all. The legacy of brighter rooms and happier hearts (with no leaky ceilings) left behind by Mr. Rasmussen comes from the personal values and abilities of the man himself, with some of his technical innovations having a surprisingly early start.

Rasmussen’s Technical Innovations

  • Did you think double-pane glass was new? Rasmussen pioneered it during World War II.
  • How about clad roof windows with wood on the inside for good looks and metal on the outside for durability? Rasmussen again.
  • Even the seemingly modern ability of a roof window to swivel around completely so outside glass surfaces can be cleaned conveniently from indoors actually first appeared during the 1940s.
  • The unique ‘PU-25’ hinge that allowed this convenience was designed, patented and manufactured by guess-who.

We know so much about Rasmussen’s personal philosophy, life’s work and technical achievements thanks to a carefully prepared biography written by Danish author, Per Boje. That’s where we learn that even while Hitler dominated Europe, Rasmussen set out to make “a roof window – that in every respect was just as good as the best vertical window”.


The story of his early start in the roof window business reads like a value tale on the qualities of perseverance. Finances were touch-and-go for the first several years of VELUX operations, despite Rasmussen’s technical abilities, his vision and a really great product. Good thing he stuck with it all.

Thanks for the “Airy Attics”

If Mr. Rasmussen were alive today, I’d offer him my personal thanks for enabling the least desirable part of a house – the attic – to become potentially the most stunning square footage you can ever own.

attic_loft_flat_skylight_roof_windowOur surroundings exert such a powerful influence on how we feel, how we see the world and how much we get done each day, that it pays to invest in them.

Sunlight, fresh air and a nice high view are always worth the trouble in my book. Well-designed attic lofts not only offer unmatched charm of this sort, but they allow the excellent use of space that would normally go to waste.

Villum Kann Rasmussen died in 1993 and is buried a couple of hundred yards from his boyhood home on Mando Island. Over his 50-year career, Rasmussen created a handful of international companies and half a dozen non-profit foundations.

But even as we enjoy the peak of our short-lived Canadian summer, it won’t be long before the weather cools and we scurry indoors as autumn rains fall. Mr. Rasmussen is easiest to remember as the man who brought sunlight, fresh air and good feelings indoors, even when Mother Nature doesn’t necessarily want to cooperate.