Roof Lights Vs Skylights: What Are The Key Differences?

June 2, 2026

Author - Gavin Helgeson

Rooflights Division Manager

sales@duplus.co.uk

If you’re planning a residential or commercial design project, you may be exploring some of the options available to you to fully utilise natural light in your space. In enclosed spaces, like loft conversions or kitchen extensions, the amount of usable wall space for a traditional window can be very limited, making the need for other lighting options even more prominent. When it comes to roof lights and skylights, thought they may look very similar, there are some key differences that make them suited to specific types of build. In this article, we will explore the differences between roof lights and skylights, what types of jobs they would be best suited for, as well as the benefits to using one of these options instead of a more traditional window.

What Is a Roof Light?

A roof light is a glazed unit, installed into a flat or pitched roof, with the purpose of increasing natural light in interior spaces. Generally, these units are used in rooms that would otherwise lack natural light, cases where the natural light doesn’t fill the whole room, or in projects where installing a traditional window isn’t an option. Roof lights are typically best suited for use on flat roofs, but can also be used on projects with a pitched roof. Roof lights are often seen in projects such as:

Loft conversions
Kitchen extensions
Home office spaces

In most situations rooflights do require planning permission, however this will need to be confirmed between the end user and their local council.

The Benefits of Using a Roof Light

Many models are designed to open, allowing for natural airflow into rooms
Roof lights, as well as other roof window types, make rooms feel more spacious
Maximising access to natural light can help to reduce your electricity usage
Allow natural light in spaces that would otherwise be unlit, such as hallways or rooms with no exterior wall

What Is a Skylight?

A skylight is a type of roof window designed to allow extra natural light into otherwise unlit spaces in residential properties. Skylights are a great way to add not only extra light, but also more ventilation and roof access to higher rooms on your property. Skylights are often used on projects such as:

Loft conversions
Flat roof extensions
Hallway and staircase roofs
Bathrooms

Typically, skylights are best suited for projects on a pitched roof, or projects surrounding rooms with no external wall, but they can also be used on a flat roof.

The Benefits of Using Skylights

Some skylight models are designed to open, allowing extra ventilation and natural airflow into spaces
Increasing the amount of natural light in a room can help you to decrease the amount of energy you use
Some skylight models open wide enough to allow access to the roof space from an internal room

The Key Differences Between Roof Lights and Skylights

Roof Lights:

Typically, roof lights are designed for flat roof applications, however they are just as versatile on pitched roof applications
Used for more “minimalist” style choices

Skylights:

Typically, skylights are designed for pitched roof applications, however they are just as versatile on flat roof applications
More closely resemble traditional windows

Get Expert Advice and High Quality Products Today

If you are planning a building project, and are wanting to explore natural lighting options, roof lights and other roof window options are a great place to start, this is where we can help. At Duplus, we supply high-quality roof windows, including flat rooflights, pitched rooflights, and roof lanterns, to suit any projects unique needs. Submit an enquiry form, or speak to one one of our experts today to find out more about how we can help with your current and future projects.