Guide · 4 August 2026 · 2 min read
Solar Control, Self-Cleaning, Frosted: Choosing Glass for a Made-to-Order Roof Light
The size gets the daylight in; the glass specification decides how the room feels in July. A plain guide to the options on every bespoke unit.
Two identical-looking roof lights can behave completely differently: one keeps the kitchen comfortable through a heatwave and rinses itself clean in the rain; the other turns the room into a greenhouse and wears every pigeon's opinion for months. The difference is the glass specification — chosen in about ninety seconds at order time, lived with for twenty years.
Solar control: for the south-facing roof
A solar-control coating reflects a large share of the sun's heat while letting most of the visible light through — the room stays bright but does not cook. If your extension faces south or west and the roof light is generous, this is the single upgrade we recommend most often. The slight tint reads as a premium, slightly cooler light rather than a visible colour.
Self-cleaning: for glass you cannot reach
A self-cleaning coating breaks down organic dirt in daylight and sheets rainwater so it rinses residue away instead of leaving spots. It does not abolish cleaning; it stretches the interval between ladder days dramatically — which, for a roof light above a single-storey extension, is most of the argument.
Frosted and satin: privacy with daylight
Overlooked bathroom, shower room, or a walk-on unit in a busy part of the garden: obscured glass keeps virtually all the brightness and none of the detail. On walk-on units it has a second benefit — you see moving light overhead rather than the soles of shoes.
Double or triple glazed?
Our high-specification double-glazed units meet Approved Document L comfortably and suit most projects. Triple glazing lowers the U-value and the sound transmission further, at more weight and cost — worth considering over bedrooms, under flight paths, or in a fabric-first low-energy build. The calculator prices both, so the comparison takes seconds rather than a call-back.
How to actually decide
Start from the compass and the room: south or west facing → solar control; hard to reach → self-cleaning; overlooked → frosted; noise or serious energy targets → consider triple. Then put your real sizes into the frameless or framed calculator and toggle the options — every combination reprices live, so you are comparing real numbers for your exact unit, not brochure averages.
Unusual combination in mind — solar-control frosted walk-on, say? Made to order means exactly that: ask through the bespoke enquiry page or call 03330 902 592 and we will build the specification with you.
Frequently asked questions
Is solar-control glass dark?
No — modern coatings reject a large share of solar heat while transmitting most visible light. The effect reads as a slightly cooler, premium tone rather than a tint you would call dark.
Does self-cleaning glass mean I never clean it?
It means you clean it rarely rather than never. The coating handles organic dirt and rain does the rinsing; an occasional wash keeps it at its best.
Can I combine options — say solar control and self-cleaning?
Yes, the common combinations are available together on made-to-order units, and the calculator prices each combination live.
Which options work on walk-on roof lights?
Anti-slip surface finishes, obscured interlayers for privacy and solar-control build-ups are all available on the walk-on range — tell us the application and we will specify it.
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Roof lights made to your exact size
Every Vant Glass roof light is manufactured to order in Liverpool, with a 20-year guarantee and free UK mainland delivery. Get an instant price or talk to the team on 03330 902 592.