Flat rooflights in West Sussex
We supply flat rooflights across West Sussex, from Crawley to the smaller towns, priced to your kerb size and delivered to your site.
Get a price in West Sussex
Send your postcode and kerb size for a fixed written quote.
Choosing flat rooflights in West Sussex
A single near-flat pane on an upstand: minimal, low and discreet.
Across West Sussex, the shortest day brings around 7h 55m of daylight and the midsummer sun reaches about 62.5° at noon. A lantern collects light from the bright overhead sky all year, and the right glass keeps the long summer days comfortable.
- Fixed or electric opening versions
- Very low profile from outside
- Usually cheaper than a lantern
- Single glazed unit with a slight fall
Delivery and fitting in West Sussex
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
Guide prices for common flat rooflight sizes, including 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 West Sussex
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.
Planning-wise, a lantern on a new extension is judged as part of that extension, while one added to an existing roof can fall outside permitted development if it stands more than 150 mm proud.
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 West Sussex: questions
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.
Are flat rooflights cheaper than lanterns?
Usually, size for size. They use one glass unit and a simple frame.
Who checks building regulations for a lantern in West Sussex?
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.