The useful answer
Begin with the intended position, footprint, inside and outside finishes and the room’s daylight and comfort priorities. Ask each supplier to explain its dimension basis and provide the appropriate upstand detail. Two identical size labels are not proof that the same prepared opening suits both systems.
Give both suppliers the same room and roof brief
Begin with the intended position, footprint, inside and outside finishes and the room’s daylight and comfort priorities. Ask each supplier to explain its dimension basis and provide the appropriate upstand detail. Two identical size labels are not proof that the same prepared opening suits both systems.
Compare the internal framing at that footprint, then the exact glass options and their relevant figures. Keep centre-pane and whole-roof thermal values separate. Identify assembly, glazing, handling and roof weathering in both scopes. If ventilation is needed, ask how it is being supplied; neither a brand name nor a lantern photograph confirms an opening function.
A situation you can apply to your own project
A homeowner is choosing glazing above a dining table. They prefer one lantern’s room-side rafter pattern but the other quote has a different glass specification. Ask for an equivalent glass brief to be priced before judging the premium. The visual preference and the comfort specification are two separate comparisons.
Compare the practical details
| Decision | What it means for your project |
|---|---|
| Geometry | Same footprint and clearly reconciled dimension basis. |
| Room-side view | Ridge, rafters and perimeter shown from comparable viewpoints. |
| Glass | Exact build-up, light transmission and solar information. |
| Roof completion | Defined responsibilities for support, fitting and weathering. |
Work through the specification
The comparison that matters
Begin with the room’s daylight and comfort brief, then compare the two exact roof proposals. A glass-only thermal value cannot be treated as the complete lantern’s performance. If you need ventilation, identify the product that will provide it rather than assuming either lantern proposal includes an opening section.
Put both quotations on the same page
| What to compare | Korniche | Atlas |
|---|---|---|
| Size basis | Confirm product dimensions and the matching upstand drawing. | Confirm the same dimension basis before comparing size. |
| Appearance | Request the proposed ridge, rafter and perimeter layout. | Compare the same footprint and the view from below. |
| Glass | Record the exact glass option, light transmission and solar-control information. | Use equivalent information rather than comparing glass colour names. |
| Installation scope | Identify delivery contents, assembly, glazing and roof-interface responsibilities. | Check the same work is included and who handles each interface. |
How to reach a decision
Write down your three most important outcomes, then ask each supplier to demonstrate or document how its proposed product meets them. Mark unanswered points as unconfirmed rather than assuming they are included. Compare the installed total only after the product and work scope are clear.
Before you choose
Ask for the final model, drawings, glass, finish, hardware, survey responsibility and written aftercare terms. This guide does not declare a universal winner or confirmed supply availability. We can use your preferred systems as the starting point for an enquiry.
Your checklist before the next conversation
- Write the exact model on both proposals
- Use the same opening and required operation
- Mark differences in glass, finish and installation
- Resolve unconfirmed items before comparing totals
- Keep drawings and written terms with the decision
Sources and specification checks
Use these primary references to check the product or technical point discussed. Match the current document to your exact system and project. Brand research does not confirm that we supply every model.
Questions people ask
Which is cheaper?
We do not have a verified like-for-like current price for your project. Compare written quotations for the same opening, specification, tax treatment and work scope.
Can I quote a manufacturer’s best performance figure in my order?
Ask the supplier for the value applicable to your actual configured product, including the size and glazing used. A best-case headline may describe a different example.