How Much Does an Aluminium Roof Lantern Cost? UK Prices 2026
Real 2026 UK prices for aluminium roof lanterns and flat rooflights, from £147, with a size-by-size table, framed vs frameless, fitting costs and FAQs.
Aluminium roof lanterns start at around £1,111, with most sitting between £1,200 and £3,000 supplied. Flat aluminium rooflights start from about £147. What you pay comes down to size, whether you choose framed or frameless, and the glass specification. Every price on this page is a real online price from our own configurator, includes VAT and comes with free UK mainland delivery, so you can see your cost before you enquire.
Quick answer: roof lantern and rooflight prices
- Aluminium roof lanterns: from £1,111, typically £1,200 to £3,000 supplied
- Flat rooflights, frameless: from £147
- Flat rooflights, framed: from £251
- Fitting guide: add roughly £400 to £1,000 for a builder to form the kerb and install, depending on access and roof type
Aluminium roof lantern prices by size
Our aluminium roof lanterns come in three shapes to suit different rooms and roof spans. All prices below are supplied and delivered, including VAT.
| Lantern range | Smallest size | From price | Largest size | Price |
|---|---|---|---|---|
| Meridian Rectangular | 1000 x 1200mm | £1,239 | 1800 x 2000mm | £2,205 |
| Lattice Elongated | 600 x 1200mm | £1,111 | 1800 x 3000mm | £3,032 |
| Traverse Wide Span | 600 x 2400mm | £1,683 | 1400 x 3600mm | £3,116 |
As a rule of thumb, a standard kitchen-extension roof lantern of around 1000 x 1500mm to 1200 x 2000mm lands between £1,300 and £1,900 supplied.
Flat rooflight prices: framed vs frameless
Flat rooflights are a lower-cost way to bring light into a flat roof. Frameless units have a slimmer sightline and, on our range, are the more affordable option. All prices supplied and delivered, including VAT.
| Size | Frameless | Framed |
|---|---|---|
| 300 x 300mm | £147 | £251 |
| 500 x 500mm | £216 | £536 |
| 600 x 900mm | £417 | £624 |
| 1000 x 1000mm | £568 | £775 |
| 1000 x 1500mm | £599 | £961 |
| 1000 x 2000mm | £800 | £1,173 |
Supplied vs installed cost
The prices above are for the lantern or rooflight supplied to your door. Because a roof lantern sits on a timber upstand or kerb built by your roofer or builder, fitting is usually part of a wider flat-roof or extension job. As a guide, allow roughly £400 to £1,000 in labour to form the kerb and install a lantern, and £150 to £400 to set a small flat rooflight where the opening is being formed anyway. Buying the unit online and having your own trade fit it typically works out cheaper than a single supply-and-fit quote from a national installer.
What affects the cost
- Size: the single biggest factor. Price rises steadily with the glazed area.
- Framed or frameless: on flat rooflights, frameless is the more affordable, slimmer option.
- Lantern shape: wide-span and elongated designs cost more than a compact rectangular lantern of similar area.
- Glass specification: upgrades such as solar-control, self-cleaning or heated glass add cost but improve comfort and reduce glare.
- Colour: standard RAL finishes are included; a bespoke colour can add a little.
- Fitting: the builder's kerb and installation, which sits outside the online price.
How to get your exact price
You do not need to wait for a quote. Choose your size and specification and see the price instantly on our aluminium roof lanterns and flat rooflights pages. Every price is made to measure, includes VAT and comes with free UK mainland delivery.
Roof lantern and rooflight cost FAQs
How much is a roof lantern for a kitchen extension?
Most kitchen-extension roof lanterns fall between £1,300 and £1,900 supplied, for sizes around 1000 x 1500mm to 1200 x 2000mm. Larger or wide-span designs go up to about £3,000.
Are frameless rooflights cheaper than framed?
On our range, yes. A frameless flat rooflight starts at £147 against £251 for the framed version, and the gap widens on larger sizes. Frameless also gives a slimmer, more contemporary sightline.
Do the prices include VAT and delivery?
Yes. Every price includes VAT and free UK mainland delivery. Fitting is separate as it is carried out by your builder or roofer.
What size roof lantern do I need?
A common guide is for the lantern to cover roughly 15 to 20 percent of the room's floor area. For most single-storey extensions that means a lantern between 1000 x 1500mm and 1500 x 2500mm.
Can I buy online and have my own builder fit it?
Yes, and it is usually the most cost-effective route. You order the made-to-measure unit online and your trade forms the kerb and installs it as part of the roof works.
Author at SmartaView, writing about aluminium glazing, home improvements and the buying process.
