What is a fixed roof light?

A fixed roof light is a non-opening glazed unit installed in a flat or shallow-pitched roof to bring natural daylight into the room below. The glass is sealed within a factory-assembled unit and does not hinge, slide or tilt — it is a permanent aperture, not a ventilator.

Fixed vs opening roof lights

The distinction is functional, not aesthetic. Both fixed and opening units can be frameless or framed, rectangular or circular. The difference is whether any part of the glazing moves:

Fixed

Opening

Ventilation

None

Manual or powered opening

Profile

Lowest — no actuator housing

Slightly deeper — hinge or chain mechanism

Cost

Typically lower

Higher — moving parts and controls

Maintenance

Minimal

Periodic checks on seals and actuators

If the room has adequate ventilation from windows, doors or mechanical extract, a fixed unit is often the right choice. Where purge ventilation or smoke ventilation is required, an opening type may be necessary — see our article on opening roof lights and ventilation.

Frameless and framed fixed units

Fixed roof lights are available in two main constructions:

Frameless fixed roof lights sit flush with the internal ceiling finish. The glazed unit is bonded to a timber upstand with minimal visible frame at the room side. They suit contemporary interiors where the aperture should read as pure glass. Configure sizes at custom frameless roof lights.

Framed fixed roof lights use an aluminium frame visible at the internal and external edge. The frame provides a defined fixing zone and weathering detail. Some framed systems include an optional PVC kerb for faster installation on new-build decks. Browse custom framed roof lights.

Typical applications

Fixed roof lights are specified wherever daylight is needed without opening ventilation:

• Rear extensions and kitchen diners
• Hallways, landings and stairwells
• Home offices and studios under flat roof sections
• Commercial spaces with mechanical ventilation already in place

They are also used in multiples — several smaller fixed units can daylight a larger room more evenly than one oversized panel.

Glass and safety

Overhead glazing must retain glass safely if damaged. Vant Glass fixed roof lights use thermally toughened safety glass with a laminated inner pane as standard. Lamination bonds two glass sheets with an interlayer so fragments stay in place rather than falling into the room below.

Double- and triple-glazed builds with low-emissivity coatings and argon-filled cavities manage heat loss through the roof plane. Solar control coatings are worth considering on south-facing installations.

What a fixed roof light is not

A fixed flat roof light is not a walk-on surface. It must not be used where foot traffic, maintenance access or furniture placement will load the glass from above. Structural walk-on glazing uses a thicker multi-pane laminated build — see walk-on roof lights for that application.

Similarly, a fixed unit is not a roof lantern. Lanterns are pitched, multi-pane assemblies that form a raised glazed roof structure — covered in our roof lanterns article.

Specifying a fixed roof light

Confirm four things before ordering:

1. Opening size — the structural cut-out in the roof deck, smaller than the inner glass pane on all sides.
2. Upstand — timber or kerb detail to support the glass weight and receive weathering.
3. Glazing build — double or triple, coatings and any acoustic or security requirements.
4. Frame type — frameless flush finish or framed with visible aluminium edge.

For non-standard shapes, pitches or multi-unit layouts, a bespoke roof light consultation may be appropriate.

Every Vant Glass roof light is made to order in Britain, backed by a 20-year guarantee and free UK mainland delivery. Configure frameless or framed sizes in the online calculators or call 03330 902 592.