Roof Lights vs Velux Windows: What’s the Difference?

The question of roof lights vs Velux windows comes up on almost every loft conversion and extension. The short answer is that Velux is a brand name, in the same way people say Hoover for a vacuum cleaner. A roof light is the general term for any glazing set into a roof. What matters is choosing the right type of roof light for your roof, your planning situation and the room below.

The main types of roof light

• Pitched roof windows: fitted into a sloping roof and usually opening by centre pivot or top hung. This is the category Velux is known for, alongside other manufacturers. Common in loft conversions and on the sloping roof of a side return extension.
• Flat roof lights: fixed or opening glazed units set on an upstand on a flat roof. Frameless designs give a clean view of the sky and are popular on rear extensions.
• Conservation roof lights: slim, steel or steel look frames that sit flush with slates or tiles, with a central glazing bar in the style of traditional Victorian roof lights. Often required in conservation areas and on listed buildings.
• Walk on roof lights: structural glass set flush into a terrace or floor above, bringing daylight to a room below.
• Lantern roof lights: pitched glazed structures on a flat roof, giving height and a more traditional look over a kitchen or orangery.

How to choose

• Roof pitch: pitched windows need a minimum pitch; flat roof lights sit on an upstand that creates the fall for water.
• Planning: on front roof slopes and in conservation areas, flush conservation roof lights are often the only acceptable option.
• Ventilation: opening units help with summer heat and condensation, and an electric or remote opening option is useful out of reach.
• Heat and glare: solar control glass and blinds make a big difference in south facing rooms.
• Fire escape: in some loft layouts, a roof window of the right size and position forms part of the escape strategy, so check with building control.
• Light where it counts: a roof light over a kitchen island or a stairwell does far more work than one over a wardrobe.

Installation matters as much as the product

Most roof light problems are installation problems: poor flashing, missing insulation around the frame, or a flat roof upstand without enough fall. Each product comes with flashing kits and details that should be followed exactly, with the opening lined and insulated so there is no cold bridge or condensation.

How we handle roof lights on London’s Prestige projects

We specify roof lights as part of the design, matching type and position to planning, building regulations and how you will use the room. Our team installs and flashes them to the manufacturer’s details, lines the reveals neatly and coordinates blinds and opening controls with the electrics. Roof lights bring daylight deep into the new top floor on our Corbyn Street loft and extension. Find out about our loft conversion service, or book a site visit and we will advise on the right roof lights for your home.