What colour should a roof lantern frame be?
Anthracite grey outside and white inside is the default on most Essex extensions, and it is the default for good reasons rather than fashion alone. Dark outside recedes against the sky and hides the dirt that collects on a roof. Light inside keeps the glazing bars from reading as a cage across the ceiling and bounces daylight back into the room.
That said, the right answer depends on what the extension already has in it, which way the lantern faces and how old the house is. This page works through the choices that actually get made, and how they fit into roof lantern installation as a whole.
The finishes that actually get specified
Aluminium lanterns are polyester powder coated to a RAL reference, so the palette is effectively unlimited and the shortlist is nonetheless short.
| Reference | Reads as | Where it suits |
|---|---|---|
| RAL 7016 | Anthracite grey, near black in shade | The general default, pairs with grey aluminium windows |
| RAL 9005 | Jet black | Heritage frontages, black casements, conservation streets |
| RAL 9010 | Pure white | Internal faces, older uPVC extensions |
| RAL 9016 | Traffic white, slightly brighter | Matching newer white window systems |
| RAL 7015 | Slate grey, warmer than 7016 | Where 7016 looks too cold against brick |
| RAL 7039 | Quartz grey, soft and mid toned | Rendered extensions, softer schemes |
Beyond these, anything is possible on a special order, with a longer lead time and no option to change your mind afterwards.
Why the outside and the inside can differ
Modern lantern sections are thermally broken, which means the outer half of the extrusion and the inner half are separated by a polyamide strip. Because the two halves are physically distinct components, they can be coated separately, and a dual finish costs a modest amount rather than doubling anything.
That single fact resolves most arguments. The exterior can match the grey bifolds on the back of the house while the interior stays white against a white ceiling. Very few people regret a dual finish. A fair number regret a dark interior once they have lived under it through a February.
What a dark interior actually does to the room
Glazing bars in a lantern are seen against bright sky for most of the daylight hours, which puts them permanently in silhouette. A white bar still catches enough light on its underside to read as part of the ceiling. A black bar reads as a hard line, and on a lantern with several bars the ceiling starts to look gridded.
There is a light level effect as well. A pale internal frame reflects daylight back into the reveal and softens the transition between bright glass and plaster. Dark frames absorb it, increasing the contrast between the opening and the ceiling around it, which some people find dramatic and others find tiring.
Matching what the extension already has
The usual anchor is the glazing already going into the same room. If the rear elevation has anthracite bifolds or an aluminium slider, matching the lantern to them is the safe call, and RAL 7016 is by far the most common reference in that situation.
Where the extension has white uPVC windows, a white lantern outside is more coherent than a grey one, even though grey is more fashionable. Mixing them is the thing that looks unresolved. Take a sample of the existing frame outside and hold the swatch against it in daylight, because whites vary more than anyone expects and 9010 next to 9016 is visible at close range.
Heat, dark finishes and movement in the section
A dark frame in direct summer sun gets hot. Surface temperatures on a black extrusion facing south can climb well above air temperature, and aluminium expands with it. Over a long lantern bar that movement is real, measured in millimetres rather than fractions.
Good systems allow for it in the gasket design and in how the glass is set, so it is not a reason to avoid dark colours. It is a reason to buy a properly engineered system rather than the cheapest section available, and it is a reason the thermal break matters: without one, that outside heat comes straight through the metal to the inner face.
Textured, matt and gloss
Powder coatings come in a gloss level as well as a colour, and the gloss level changes the look more than people anticipate. A high gloss dark frame reflects sky and reads lighter than the swatch suggests. A matt or fine texture finish absorbs, holds its depth and hides minor marks.
Textured matt, often written as a sablé or fine structure finish, has become the usual choice on grey and black frames because it looks contemporary and it does not show fingerprints or installation scuffs. On white, gloss is more common and stays cleaner looking over time.
Colour on a timber lantern
Painted softwood or hardwood behaves differently, since the finish is a coating on a moving substrate rather than baked onto metal. Traditional lanterns are usually finished in an off white, a warm stone, or a soft heritage tone rather than a hard modern grey, and that suits the buildings they go on.
Timber wants recoating on a cycle, and a dark colour on a south facing timber frame works its finish harder than a pale one. Where a period property calls for the look of a timber lantern with less upkeep, an aluminium clad timber unit puts the maintenance outside and the warmth inside. The comparison is set out on aluminium and timber roof lanterns compared.
Conservation areas, and what tends to be accepted
In the conservation areas around Thaxted, Coggeshall, Saffron Walden and the older core of Maldon, a lantern on a rear extension is generally judged on how quietly it sits. Black or a very dark grey in a matt finish reads as historically plausible in a way that mid grey and white do not.
Slim sightlines matter as much as the colour. A dark, narrow bar disappears against sky, while a wide white one draws the eye from the garden. Where a conservation officer is involved, agreeing the finish before the order goes in avoids a repaint that is not actually possible once the frame is coated.
Living with the choice
A powder coated finish on a domestic lantern will hold its colour for decades with nothing more than the twice yearly wash the glass gets anyway. It cannot be changed afterwards in any satisfactory way, so the decision is effectively permanent from the day the order is placed.
That is the reason Sunspire settles finish at survey, with a physical swatch held against the existing frames in daylight rather than a screen image. A colour looks different on a small chip, on a large surface and against sky, and ten minutes outside with a sample answers the question better than an afternoon of browsing.
Tell us about your roof
We start with the building, the covering and the slope. Then we tell you what will suit it, and what it will cost, as a fixed written number.
- Surveyed before it is priced
- 10-year workmanship guarantee
- Building Control notification handled
- New installations and replacements