Frameless vs Framed Roof Lights: Which Should You Choose?

Choosing between a frameless and a framed roof light is usually the first decision on any flat-roof glazing project — and it shapes the look of the room more than any other choice you will make. Both options bring in significantly more daylight than a vertical window of the same size, both are made to order in bespoke sizes, and both carry the same 20-year guarantee when they come from our Liverpool factory. The right answer depends on your roof build-up, your budget and the finish you want.

What is the difference between frameless and framed roof lights?

A frameless roof light bonds the glass directly to a slim structural perimeter that sits hidden below the finished roof line, so from inside you see glass and sky — no visible frame at all. A framed roof light holds the glazed unit in a thermally broken aluminium frame that sits proud of the roof, giving a neat, defined border and a slightly lower price for the same glass size.

Frameless roof lights: the seamless option

Our Frameless Fixed Flat Glass Roof Light is the one architects specify when the brief says "minimal". The glass is structurally bonded, the sightlines are virtually invisible from inside, and rainwater runs cleanly off the edge rather than pooling against a frame.

Choose frameless when:

• The roof light is the centrepiece of a kitchen extension or living space
• You want uninterrupted sky views and the cleanest possible ceiling aperture
• The interior design is contemporary and minimal
• You are glazing a large single span and want it to feel like a hole in the roof, not a window

Framed roof lights: the practical all-rounder

The Framed Fixed Flat Glass Roof Light uses a polyester powder-coated aluminium frame with a full thermal break. It is easier to handle on site, simpler to flash into a wider range of roof build-ups, and typically comes in at a lower price than frameless for the same glazed area.

Choose framed when:

• Budget per square metre matters and you still want a premium finish
• The roof light sits high or out of normal sightlines, so a slim frame is invisible anyway
• Your roofer wants a straightforward, well-documented upstand detail
• You are fitting several units and want consistency across the roof

Which performs better thermally?

Both styles use the same high-specification double-glazed units as standard, with self-cleaning and solar-control options, so whole-unit thermal performance is very similar. What matters for building regulations is the whole-unit U-value of the glass and surround together — and because every Vant roof light is made to order, we will confirm the exact figure for your size and specification before you order. Both comfortably meet the requirements of Approved Document L for replacement and new flat-roof glazing.

How much should I budget?

Frameless construction is more labour-intensive, so expect to pay roughly 15–25% more than an equivalent framed unit. Because both are made to measure, the honest answer for your project takes about a minute with our online calculators: price a frameless roof light or a framed roof light in your exact dimensions and compare like for like. Both include free UK mainland delivery, and our lowest-price guarantee applies to each.

The bottom line

If the roof light is a design feature you will look at every day, frameless is worth the premium. If you want maximum daylight per pound with a clean, contemporary finish, framed is the smarter buy. Either way the glass is manufactured to your exact size in our Aintree factory, delivered free to UK mainland addresses, and covered for 20 years.

Still unsure? Send us your sizes through the bespoke roof light enquiry page or call the team on 03330 902 592 — we will talk through the roof detail with you or your builder before you commit.