Skylights vs roof lights vs loft windows: what's the difference?

Roof lights, skylights, loft windows… aren't they all the same thing? Not quite. Learn the key differences in our homeowners' guide.

Some window manufacturers and suppliers use the terms to describe different kinds of products – but the distinction is murky and tends to be manufacturer-specific. Others use the terms interchangeably.

Local habits play a part too. People in the States tend to use the term "skylight" more often, while British English speakers err towards "roof light". You say "tomato", et cetera et cetera.

If the definition of "skylight" or "roof light" sounds very much like the definition of "a window", then – yes, it's not far off.

But it's not quite as simple as "a skylight is a roof light is a loft window". Loft windows are the odd one out. Here's why.

Loft windows

Skylights and roof lights are, more often than not, fixed panes of glass that sit within the roof. They can't be opened – or, if they can, they only open a teensy bit to allow some ventilation.

Loft windows are, well, windows. They come with all the features you'd expect from a window. They're hinged at the top and can open fully, just like any other window. Under certain circumstances, they can even be classified as emergency exits.

Thanks to their window-ness, loft windows are covered under BS EN 14351-1:2010. This is the British Standard for all non-fire-resistant windows and doors.

So loft windows have more features than skylights – but because they're governed by regulations, you have a little less flexibility in terms of where you can install them.

Skylights are typically installed on flat roofs – and are often out of plane (jutting out) from the level of the tiling.

Loft windows, on the other hand, must be installed in-plane (level) with the surrounding roof at a minimum pitch of 15 degrees.

There are other stipulations too. For instance, loft window manufacturers must test their products to ensure they perform adequately in different weather conditions.

Benefits of roof-mounted glazing

So, what's the big deal with roof-mounted glazing. you ask?

There are three main benefits to consider. The first is energy efficiency.

This might sound counter-intuitive. Surely a roof-mounted window is less insulating than, well… a roof?

Yes and no. Modern roof windows are almost always double- or triple-glazed. They're specially designed to trap heat and be impervious to moisture or leaks.

And there are other energy-efficiency gains. For one, roof glazing allows natural light to flow into the room. This means you're less likely to run up your energy bill by leaving lights on.

They don't just bask the room in sunlight, either. They also allow that lovely summer heat to come in and warm your living environment.

We've already covered the second benefit – sort of. Roof glazing means more light in your living space – and more light is good for the soul.

This isn't us getting philosophical. Scientists have studied the benefits of natural light – and have concluded that exposure to sunlight supports our natural sleep rhythms and, by extension, improves overall well-being.

Finally, there are the aesthetic benefits. Roof glazing is gorgeous to look at and can even improve the value of your home. How's that for an investment opportunity?

Another option: roof lanterns

If a skylight, roof light or loft window doesn't cut the mustard for you, then maybe you're on the lookout for something with a bit more pizazz?

Look no further than the roof lantern. These show-stopping glass structures sit on flat roofs and are made up of several panes of glass to create a pyramid, box or dome-like shape.

Unlike the other three options, roof lanterns typically protrude quite far from the roof. This means they offer maximum exposure to natural light.

Not only are they fantastic at letting the light pour in but they can also make your living space appear more spacious.

Interested in roof glazing?

Luckily for you, we can offer all of the above.

Calder Windows is one of Yorkshire's most trusted specialists in doors and windows. With a huge range of customisable skylights and roof lights available, we guarantee we can help create the perfect look for your home.

All of our windows come as standard with a 10-year warranty – because we care about our customers and the service they receive.

With over 30 years of experience, we've gained a deep understanding of our products and the industry we're in. So, if you're looking for a trusted roof light company in West Yorkshire, we're ready to help. Get in touch today for a free, no-obligation quote.