How Much Do Aluminium Rooflights Cost in the UK? (2026 Guide)
Most homeowners pay 350 to 2,500 pounds supply-only for an aluminium flat rooflight in 2026, or roughly 650 to 3,500 pounds fitted, depending on size. Here is the price by size and how to get your exact figure online.
Most homeowners in the UK spend between £350 and £2,500 supply-only on an aluminium flat rooflight in 2026, and roughly £650 to £3,500 fitted, depending mainly on the size and whether it is fixed or opening. This guide breaks down the price by size, what pushes it up, and how to get your exact figure in minutes.
Aluminium flat rooflight price guide by size (2026):
| Size (approx) | Supply only | Supply & fit |
|---|---|---|
| 600 x 600mm | £350 – £650 | £650 – £1,100 |
| 800 x 800mm | £450 – £850 | £800 – £1,400 |
| 1000 x 1000mm | £600 – £1,200 | £1,000 – £1,900 |
| 1500 x 1000mm | £900 – £1,800 | £1,400 – £2,600 |
| 2000 x 1000mm+ | from £1,400 | from £2,200 |
These are typical UK prices for a fixed, thermally broken aluminium flat rooflight. Opening (manual or electric) and walk-on glass rooflights cost more. You can configure your exact price online in minutes.
What affects the price of a flat rooflight
Size. The biggest driver. Larger glass units cost more and are heavier to handle and fit.
Fixed vs opening. A fixed rooflight is the cheapest option. An opening rooflight, especially an electric one for ventilation or smoke escape, costs more.
Glass and performance. Standard double glazing is the baseline. Solar-control glass to cut overheating, self-cleaning coatings, triple glazing and walk-on glass all add cost.
Upstand and roof works. A flat rooflight sits on an upstand (kerb) formed on your flat roof by the builder. Forming the opening and upstand is a separate cost on top of the rooflight.
Supply only vs supply and fit
Supply only is the lowest-cost route: you receive the made-to-measure rooflight and your own builder fits it to the upstand they are already forming. Supply and fit costs more but the installer handles everything. On most flat-roof or extension projects the builder is already on site, so supply only is often the better value.
How to keep the cost down
Buy supply only and use your existing builder, choose a fixed rooflight unless you genuinely need ventilation, size it to the room, and order direct from the manufacturer. An exact online price up front avoids estimates that creep up.
Rooflight or roof lantern?
A flat rooflight sits flush with the roof for a clean, minimal look and usually costs less, while a roof lantern is a raised, pitched feature that makes more of a statement. If you are weighing them up, see our guide to how much aluminium roof lanterns cost, or browse roof lanterns.
Frequently asked questions
How much does an aluminium rooflight cost in the UK?
Most homeowners pay between £350 and £2,500 supply-only, or roughly £650 to £3,500 fitted, depending on the size and whether it is fixed or opening.
How much does it cost to fit a flat rooflight?
Fitting typically adds a few hundred pounds depending on access and the upstand. A small fixed rooflight often works out around £650 supply-and-fit in total, rising with size. Forming the opening and upstand is a separate builder cost.
What is the difference between a fixed and an opening rooflight?
A fixed rooflight cannot open and is the cheapest option. An opening rooflight, manual or electric, lets you ventilate and costs more.
Do I need an upstand for a flat rooflight?
Yes. A flat rooflight sits on a raised upstand (kerb) built on the flat roof, which keeps water out and sets the angle. Your builder forms this as part of the roof works.
Should I choose a rooflight or a roof lantern?
A rooflight is flush, minimal and usually cheaper, while a roof lantern is a raised feature that makes more of the ceiling. It comes down to the look you want and your budget.
Ready to see your exact price? Configure your aluminium rooflight online, choose your size, glass and opening options, and watch the price update live. Free UK mainland delivery.
Author at SmartaView, writing about aluminium glazing, home improvements and the buying process.
