Aluminium Roof Lantern for Flat Roofs – Slimline Double Glazed Skylight Lantern, 10 Sizes

Nothing transforms a flat-roof extension like a roof lantern.

Where a flat rooflight gives you a window to the sky, a lantern gives the room height — the pitched glass draws the eye upward, floods the space with light from four directions, and turns a kitchen extension or orangery from a room with a skylight into a room built around one.

This is a slimline aluminium lantern in the contemporary style: a hip-ridge profile at a 25° pitch, an ultra-slim ridge sightline of around 40mm, and thermally efficient double glazing in toughened safety glass.

It sits on a kerb upstand around your roof opening — the natural companion to an EPDM flat roof, where the membrane dresses up the kerb to form a clean, permanently sealed junction at the lantern's base.

Key benefits

• Slimline aluminium frame with a ~40mm internal ridge sightline — maximum glass, minimum frame
• Double glazed toughened safety glass (BS EN 1279 / BS EN 12150), 1.0 W/m²K glazing U-value (1.5 overall)
• Self-cleaning solar-control glass options to cut glare and summer heat gain
• Three frame colours — Anthracite Grey, White and Jet Black — matched inside and out
• Engineered for UK weather: 1.32 kN/m² wind load, 1.0 kN/m² snow load rating
• 10-year warranty

Suitable applications

Kitchen and rear extensions, orangeries, garden rooms, single-storey flat-roof living spaces — any flat roof (EPDM, felt or single-ply) where you want a statement centrepiece rather than a flush rooflight.

If you're roofing an orangery with our Orangery EPDM Rubber Roof Kit, this lantern is the matching centrepiece the kit is designed to work around.

Specification

Installation & ordering guidance

Sizes are external kerb dimensions — the lantern is made to sit on a kerb upstand built around your structural roof opening, so order the size matching your kerb, not the clear opening.

On an EPDM roof, dress the membrane up and over the kerb before the lantern is fitted: prepare with our EPDM Rubber Roof Primer, bond with EPDM Contact Adhesive, and if you're building the whole roof, our roof kit calculator can allow for the lantern opening as a skylight void.

FAQs

Which glass should I choose?
Clear maximises light; Blue Solar and Neutral Solar are self-cleaning solar-control options that cut glare and summer overheating in south-facing rooms — all three are the same price.

Do I need to build the kerb myself?
Yes — the lantern sits on a site-built kerb upstand (typically timber, insulated and membrane-wrapped) around your roof opening.

Your roofer or builder forms this as part of the roof structure.

Is the frame the same colour inside and out?
Yes — each frame colour option here is matched inside and out for a clean look from the room below and the garden above.

Will it work with a felt or fibreglass roof rather than EPDM?
Yes — the kerb-mounted design works with any flat roof covering; the membrane or covering simply dresses up the kerb beneath the lantern.

How is it delivered?
As a large glazed unit it ships on a dedicated two-person kerbside delivery — allow for safe access and handling on site, and check the glass on arrival before signing.