What colour should a roof lantern frame be?

The usual choices

Anthracite grey (RAL 7016) is the default on modern extensions. Dark without being black, and it sits well against brick, render and grey aluminium windows.

Black (RAL 9005) is sharper and more graphic. Right where the glazing is meant to look like steel, and right on many period properties.

White (RAL 9010) is less fashionable and often more correct on a Victorian or Edwardian house with white joinery, where anthracite can look anachronistic.

Dual colour

Most systems will coat inside and outside differently at modest extra cost. Anthracite outside to match the windows and white inside to disappear against a white ceiling is a common and good combination.

It is worth thinking about the inside separately. From below you see the frame against the sky, and a dark frame reads as a strong grid. Some people want that; others find a white interior lighter and quieter.

Conservation areas

Where a property is listed or in a conservation area, black is almost always the expected answer, and the product is usually a flush conservation rooflight rather than a lantern at all.

The part that matters more than colour

Near the coast, the coating specification matters more than the colour. A standard architectural powder coat exposed to salt chalks within a few years regardless of which RAL number it is.

Three that work, and one to think twice about

Lantern frames are powder coated aluminium in almost every case, and the colour is chosen from a standard range at the point of order. It cannot sensibly be changed afterwards.

White inside is the default and it is the default for good reasons. It reflects light back into the room, it disappears against a white ceiling, and it makes the frame members read as thin. On a lantern with several glazing bars that matters, because the frame is a visible presence from below.

Anthracite grey outside is the current standard and it suits most houses. It reads as a dark line against the sky, it recedes visually, and it does not show dirt the way white does on an external surface.

Black is the alternative outside, particularly on a period property or where other joinery is dark.

Different inside and out

White inside and dark outside is the most commonly specified combination, and most manufacturers offer it as standard rather than as an upgrade. It gives you the reflective interior and the discreet exterior without compromising either.

Where a room has dark joinery or a strong interior scheme, a dark frame inside can look excellent, and it will make the room feel slightly darker.

What to think twice about

White outside. It shows dirt and algae quickly on a horizontal surface, it stands out against the sky rather than receding, and on most houses it reads as dated.

Also worth avoiding: a colour chosen to match a current kitchen scheme. A lantern lasts decades and a kitchen does not.

The heat question

A dark frame absorbs more solar heat than a light one, and on a thermally broken profile that has almost no effect on the room, because the break stops the heat crossing to the inner face.

It does mean a dark frame runs hotter in the sun, which contributes very slightly to thermal movement, and it is a reason to make sure the frame is genuinely thermally broken rather than merely coated.

Matching

Where the extension has aluminium bifold doors or windows, matching the lantern to them is worth doing and it is usually straightforward, because both come from the same standard colour ranges.

Take the reference from the actual product rather than a name, because two manufacturers’ versions of the same nominal colour can differ.

Conservation contexts

Where a lantern is on a listed building or in a conservation area, matt black or a very dark finish is what officers expect, and gloss white will not get through. Take the reference to the application rather than leaving it open.

The decision is about contrast, not taste

A lantern frame either recedes or it frames. Both work. What does not work is landing between the two.

Dark, in anthracite or black. The frame reads as a line rather than a mass, the glass dominates, and from inside the sky is framed by something thin and quiet. This is the default on contemporary extensions for good reason.

White or off white. The frame reads as joinery. It suits a traditional building, a painted timber interior, or a period property where a dark frame would look like an implant. From inside it brightens the reveal.

A mid grey, a beige or a warm metallic on a building that is committed to one of the above tends to look unresolved.

Inside and outside can differ

Most manufacturers offer a dual colour finish, and it is frequently the right answer. Dark outside so the lantern sits quietly against the roof and the sky, white or a soft colour inside so it works with the ceiling.

It costs a little more and it resolves the common conflict between what suits the garden elevation and what suits the kitchen.

Finish, which matters as much as colour

Matt or satin rather than gloss. A high gloss powder coat on a horizontal surface catches every reflection and draws the eye upward to the frame rather than through it.

And check the coating specification if the property is near the coast, where a marine grade finish is worth the difference.