When planning a kitchen extension, orangery, or flat-roof renovation, one of the most important decisions is how to bring natural light into the space. The two most popular options in the UK are roof lanterns and flat skylights. Both improve brightness and create a more open atmosphere, but they differ in appearance, performance and installation.

This guide explains the differences, benefits and considerations so you can decide which is best for your home.

What Is a Roof Lantern?

A roof lantern is a raised, multi-panel glazed structure installed on a flat roof. It usually has angled panes that form a pyramid, contemporary shape or rectangular pitched design.

Characteristics of roof lanterns:

• raised structure

• multiple glazed angles

• architectural feature

• brings in light from several directions

• creates a feeling of height in the room

Roof lanterns are commonly used in kitchen extensions, dining rooms and larger living spaces.

What Is a Flat Skylight?

A flat skylight (also known as a flat rooflight) is a low-profile pane of glass installed flush or almost flush with the roof surface.

Characteristics of flat skylights:

• slim, minimal appearance

• single large pane

• modern style

• unobtrusive from the outside

• ideal for smaller rooms or clean, simple aesthetics

They are often chosen for bathrooms, hallways, utility rooms, and minimalist extensions.

What Are the Key Differences Between a Roof Lantern and a Skylight?

Here is a breakdown of the main distinctions:

1. Appearance and Style

Roof Lantern:

• creates a feature inside and out

• adds height and visual impact

• becomes a focal point in the room

Skylight:

• very minimal

• clean, flat profile

• does not change the roofline significantly

Best choice for visual impact: Roof lantern
Best choice for subtle design: Skylight

2. Amount of Natural Light

Roof lanterns typically draw in more natural light because the angled glass captures sunlight from several directions. They brighten a room more evenly throughout the day.

Skylights provide strong light directly from above but may not distribute it as widely.

Best choice for maximum brightness: Roof lantern

3. Heat Control and Thermal Performance

Both products now offer excellent energy performance due to modern glazing technology, including:

• low-e coatings

• argon-filled units

• warm edge spacers

• thermally broken frames

However, because roof lanterns have more glass surfaces, they may allow more solar gain in south-facing spaces unless solar-control glazing is chosen.

Best choice for controlled heat levels: Skylight
Best choice for balanced light and warmth: Roof lantern with solar glass

4. Privacy

Skylights offer more privacy because they sit flat on the roof and are less visible from neighbouring properties.

Roof lanterns are more noticeable due to their raised profile.

Best choice for privacy: Skylight

5. Ventilation Options

Both can include opening panels, but skylights often allow larger ventilation sections.

Best for ventilation: Skylight (opening models)
Roof lantern vents are available but usually smaller.

6. Cost

Skylights are generally more cost-effective due to their simpler structure and reduced labour.

Roof lanterns require more glass, more framing and more installation time.

Best for lower cost: Skylight

7. Aesthetics From Inside the Room

A roof lantern creates a more dramatic internal effect, especially in kitchen extensions, with visible angles and increased ceiling height.

A skylight offers a cleaner, minimal ceiling line.

Best for feature effect: Roof lantern
Best for minimal interiors: Skylight

Which Option Should You Choose?

Here is a quick decision guide:

Choose a Roof Lantern if you want:

• maximum natural light

• a statement feature

• more visual height inside

• a brighter kitchen or living area

• strong architectural detail

Choose a Skylight if you want:

• a minimal and modern look

• subtle design

• cost-effective glazing

• strong ventilation

• more privacy from neighbours

Frequently Asked Questions

Do roof lanterns make a room warmer?

They can increase solar gain, particularly on south-facing roofs. Solar-control glass can reduce this significantly.

Are roof lanterns suitable for flat roofs?

Yes. Most are designed specifically for flat or low-pitch roofs.

Do skylights leak more easily than roof lanterns?

When installed correctly and with proper flashing, both options are designed to be watertight.

Which option provides more light?

Roof lanterns typically bring in more natural light because of their angled design.

Do both options come with self-cleaning glass?

Most premium manufacturers offer self-cleaning glass for both.

Need Help Choosing the Right Glazing for Your Extension?

Home Build Doors supplies a wide range of:

• roof lanterns

• flat skylights

• opening rooflights

• fixed rooflights

• thermally broken aluminium systems

• bespoke and made-to-measure sizes

If you’re not sure which is most suitable for your project, our team can help you compare options based on budget, room size, orientation and design style.

For expert guidance or a free quotation, contact Home Build Doors.