PLANNING • SPECIFICATION • PRACTICAL ADVICE
Korniche vs Ultrasky Roof Lanterns: Sizes, Glass & Prices
Compare Korniche and Ultrasky roof lantern frame options, shapes, glazing inclusions and prices before choosing your supply-only kit.
Updated 9 November 2026
Korniche and Ultrasky both offer supply-only roof lanterns for extensions and orangeries. The useful differences are frame construction, permitted shape, glass inclusions and the price for your actual dimensions. This guide compares the options currently available through Roof Lantern Kits.
Korniche versus Ultrasky at a glance
| Feature | Korniche lantern | Ultrasky lantern |
|---|---|---|
| Frame construction | Aluminium inside and outside | PVC/PVC, aluminium/PVC or aluminium/aluminium |
| Shape in our designer | Rectangular or square pyramid | Rectangular, with a ridge at least 500 mm long |
| Pitch | 25° | 25° |
| Ordering measurement | External upstand including waterproof membrane | External kerb |
| Online dimension limits | Width 850–4000 mm; length 850–6000 mm; length at least equal to width | Width 1000–4000 mm; length 1500–5850 mm; length at least width plus 500 mm |
| Glass inclusion | Selected double glazing included | Choose an unglazed frame or add a glass package |
| Stock finishes | White, anthracite grey and black | White, grey and black; material/finish combination affects price |
| Bespoke pricing | Next compatible price band; exact dimensions retained | Next size band for frame pricing; exact dimensions retained |
Dimension limits do not guarantee an online price for every combination. The designer will identify configurations requiring a quotation. Product previews illustrate proportions and finishes rather than final manufacturing details.
Choose Korniche when these features matter
Start with Korniche if you want an aluminium frame inside and outside, or a square pyramid lantern. Its online price includes your selected double glazing, which makes it straightforward to compare a complete glazed kit. Review the finished internal colour from the room below as carefully as the outside colour.
Explore Korniche roof lanterns, specifications and prices.
Choose Ultrasky when you want more frame combinations
Start with Ultrasky if you want to compare PVC and aluminium frame combinations or need an explicitly unglazed frame option. The minimum ridge rule matters: a square opening cannot simply be entered as a square Ultrasky lantern in this designer. Ask your installer to confirm the roof arrangement before ordering.
Explore Ultrasky roof lanterns and glazed or unglazed prices.
Which is cheaper?
There is no single answer across all dimensions and glazing choices. Compare the same size, finish, VAT treatment and delivery scope. Our roof lantern price guide includes current glazed examples for both ranges plus an explicitly unglazed Ultrasky example. The glass packages are named so you can see what is being compared.
Which glass should I select?
Think about orientation, shading, the room’s use and the daylight reaching rooms behind the extension. Insulation, light transmission, solar control and privacy are separate considerations. A centre-pane glass U-value is not a whole-lantern U-value, and two glasses with similar tint or insulation figures may perform differently in other respects. Read our glazing and performance guide.
What should I confirm before ordering?
Agree the finished kerb dimensions, supporting roof, ridge direction, internal and external finish, glass package and delivery postcode. Check the guarantee and current delivery estimate for the exact product supplied. Installation, the timber kerb, roof preparation and lifting are outside the supply-only price.
Our manufacturer guides and installation PDFs include separate product documents. Use the correct system and generation for the order; instructions from another lantern are not interchangeable.
Would a flat skylight suit the room better?
A lantern creates a raised glazed feature. A flat skylight offers a lower-profile appearance, although it still requires the manufacturer’s installation fall. Compare Stratus and Korniche flat skylights and Korniche FlatLite if you prefer that look.
For help choosing, call 0345 619 7733 or send us your dimensions and project details.
