Large roof lanterns in Watford
From a small lantern over a hallway to a long one above a kitchen island, we quote large roof lanterns for Watford homes to the exact kerb size, with glass and colour choices set out clearly before you commit.
Price a large roof lantern for Watford
Postcode and kerb size first, then your details. We reply with a fixed written quote.
Large roof lanterns for Watford homes
Lanterns of three metres and more for open-plan extensions, with intermediate rafters.
Winter daylight in Watford lasts about 7h 48m, against 16h 40m in midsummer. Glass in the roof makes the most of the short days, and the right glass keeps the long ones comfortable.
- Solar-control glass recommended
- Lengths from about three to six metres
- Intermediate rafters carry the larger glass
Delivery and fitting in Watford
We confirm the delivery cost and date for WD17 on your quote. Lanterns arrive palletised, with the glass packed separately.
If you would like us to fit it, we will check fitting cover for WD17 and quote a fixed price after seeing photos or surveying.
Delivery to WD17 is standard mainland delivery, priced for your postcode and confirmed in writing before you order.
Large roof lantern prices for Watford
Typical guide prices for large roof lanterns, supply only and including VAT:
| Kerb size | Roof area | Guide price | Configure |
|---|---|---|---|
| 1500 × 3000 mm | 4.50 m² | £2,595–£2,995£2,162 ex VAT from | Configure |
| 2000 × 4000 mm | 8.00 m² | £4,095–£4,795£3,412 ex VAT from | Configure |
| 2500 × 4000 mm | 10.00 m² | £4,895–£5,695£4,079 ex VAT from | Configure |
| 3000 × 4000 mm | 12.00 m² | £5,695–£6,595£4,746 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 for Watford
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 in Watford 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
Questions from Watford
Does a large lantern need structural calculations?
The roof structure around it usually does. Your engineer or building control body will want the lantern's weight and the opening size.
Do large lanterns overheat a room?
A large area of south-facing glass can make a room warm on sunny days. Solar-control glass, an opening vent and good background ventilation all help. Our guide on overheating explains the options.
Is it worth having solar-control glass in Watford?
With the midsummer sun about 61.8° high at noon, roof glass in Watford gets strong summer sun. Solar control is recommended for large or south-facing lanterns.
Do I need planning permission for a roof lantern in Watford?
Often not, but it depends on the roof, the property and whether it is listed or in a conservation area. Check with your district, borough or unitary council before ordering.