Flat rooflights in Cornwall
We supply flat rooflights across Cornwall, from Redruth to the smaller towns, priced to your kerb size and delivered to your site.
Get a price in Cornwall
Send your postcode and kerb size for a fixed written quote.
Choosing flat rooflights in Cornwall
A single near-flat pane on an upstand: minimal, low and discreet.
Across Cornwall, the shortest day brings around 8h 01m of daylight and the midsummer sun reaches about 63.1° at noon. A lantern collects light from the bright overhead sky all year, and the right glass keeps the long summer days comfortable.
- Minimal, frameless-looking from inside
- Usually cheaper than a lantern
- Single glazed unit with a slight fall
- Sized to your upstand
Delivery and fitting in Cornwall
Delivery to mainland addresses here is quoted for your postcode and confirmed in writing before you order.
Fitting can be quoted where we have cover; send your postcode and photos of the roof and kerb and we will confirm before quoting.
Flat rooflight prices
What flat rooflights cost in common sizes (guide, inc VAT, supply only):
| Kerb size | Roof area | Guide price | Configure |
|---|---|---|---|
| 1000 × 1000 mm | 1.00 m² | £595–£695£496 ex VAT from | Configure |
| 1200 × 1200 mm | 1.44 m² | £695–£845£579 ex VAT from | Configure |
| 1000 × 1500 mm | 1.50 m² | £695–£845£579 ex VAT from | Configure |
| 1000 × 2000 mm | 2.00 m² | £845–£995£704 ex VAT from | Configure |
| 1500 × 1500 mm | 2.25 m² | £895–£1,095£746 ex VAT from | Configure |
Guide prices include VAT at 20%, supply only, aluminium with self-cleaning double glazing in a stock colour. Your fixed price is confirmed in writing on your quote before you order.
Planning and building regulations in Cornwall
England's Approved Document L caps the U-value of new or replacement rooflights in existing homes at 2.2 W/m²K, calculated with the glass horizontal.
Lanterns on permitted development extensions are part of the extension's height limits. Adding one to an existing roof is different: over 150 mm of projection can mean a planning application.
Building regulations are checked by your local authority building control team or a registered building control approver. Replacing a rooflight in an existing home is building work. Installers registered with a competent person scheme can self-certify; otherwise building control must be involved.
Sources: Approved Document L, GOV.UK · Planning Portal
Flat rooflights in Cornwall: questions
Are flat rooflights cheaper than lanterns?
Usually, size for size. They use one glass unit and a simple frame.
Do flat rooflights leak?
They should not, provided they are installed on a properly flashed upstand with the right fall and the seals are maintained.
Can a flat rooflight open?
Some ranges offer electric opening versions. Ask for availability for your size.
Who checks building regulations for a lantern in Cornwall?
Your local authority building control team or a registered building control approver. For a lantern in a new extension it forms part of the extension's approval; replacements in existing homes have their own rules.