Few things transform a new extension quite like natural light. Walk into a bright, sun-filled kitchen extension and it feels like part of the house, not an afterthought.
One of the biggest decisions is how to bring that light in. Rooflights and roof lanterns are the two most popular options for flat roof extensions, garden rooms and loft conversions, though they work differently. Research suggests people in the UK spend up to 90% of their time indoors, which explains why natural light is now such a priority for extensions. This guide covers the key differences between rooflights vs roof lanterns, helping you choose the option that suits your roof type, budget and the amount of natural light you want.
Key differences between rooflights and roof lanterns
Rooflights and roof lanterns both add natural light to a flat roof extension compared to a pitched roof, but each does it differently. Roof position, light output and visual impact all vary. The table below gives a quick comparison on each feature.
| Flat rooflights | Roof lanterns | |
| Roof position | Sits flush with the roof surface | Raised above the existing roof level |
| Light output | Adds natural light and natural daylight | More natural light, thanks to extra glazed panels |
| Best suited to | Smaller spaces, smaller rooms, central areas or specific areas like a bathroom | Larger spaces such as open-plan kitchen extensions, garden rooms and loft conversions |
| Visual style | Clean lines, subtle and unobtrusive | Bold architectural feature, a genuine focal point |
| Installation | A more straightforward installation | A more complex installation, often needing extra support |
| Suits | Modern homes and contemporary homes wanting a low-profile finish | Homes wanting a design statement and a sense of height |
Flat rooflights
Flat rooflights, sometimes called roof lights, sit flush with the roof surface for a subtle, low-profile finish. They’re a great option for smaller spaces or smaller rooms where a large upstand isn’t needed.
Flat glass rooflights add natural light to central areas such as hallways. Their clean lines make them a popular choice for modern homes and contemporary homes.
Roof lanterns
A roof lantern is raised above the existing roof level, adding a sense of height and more natural light. It’s a bold architectural feature that becomes a genuine focal point.
The extra glazing and the aesthetic appeal of high ceilings make a lantern more of a design statement, which is why it’s a popular choice for larger spaces such as open-plan kitchen extensions, garden rooms and loft conversions.
Which is the best option for a flat roof extension?
For most flat roof extensions, a roof lantern is the best option if you want a bold focal point and a stronger sense of space, while flat rooflights suit projects where a low-profile finish and straightforward installation matter more than dramatic visual impact.
Thermal efficiency and energy costs
All our frames are double glazed as standard to reduce heat loss, with the option of triple glazing to take thermal efficiency further and cut energy costs in the long run. Our glazing solutions balance natural light with genuine energy efficiency, so a beautiful feature doesn’t lead to higher energy costs.
Installation, maintenance and design options
A roof lantern is generally a more complex installation than a flat rooflight, often needing extra structural support. Roof lanterns tend to have longer installation time and slightly higher cost, though many homeowners feel the extra visual impact is worth it.
Once fitted, rooflights and roof lanterns only need regular maintenance, such as cleaning the glazing from a sturdy ladder once or twice a year. We offer custom sizes and a variety of shapes, from traditional lanterns to slimline flat rooflights, so there’s a design to match your roof type.
Which is the right choice for your extension?
Costs vary depending on size and glazing specification, so it’s worth speaking to our team for an accurate price. A roof lantern remains a popular choice for a bold architectural feature, while flat rooflights are a good choice for clean lines and a more understated aesthetic impact.
There’s no single best option that suits every home. It depends on your roof, budget and design visions for the finished space.
Bring natural light to your extension with BSF Windows
Get in touch today for honest advice on the best option for your project. Our team has years of experience helping homeowners across Surrey and Sussex and a member of our team is always happy to help.
- Request a quote through our website
- Call our team today on 01293 408 713
- Email us at bsfwindows@gmail.com
- Visit our showroom at 31-33 Station Road, Horley, Surrey RH6 9HW