Rectangular roof lanterns in Dartford
Choosing a rectangular roof lantern for a house in Dartford? Start with the guide prices below, check the planning and building regulations notes for England, then ask for a fixed quote with delivery to DA1.
Price a rectangular roof lantern for Dartford
Postcode and kerb size first, then your details. We reply with a fixed written quote.
Rectangular roof lanterns for Dartford homes
The classic double-hipped lantern: a ridge, four sloping sides and the most size choice.
Winter daylight in Dartford lasts about 7h 50m, against 16h 38m in midsummer. Glass in the roof makes the most of the short days, and the right glass keeps the long ones comfortable.
- Suits kitchen-diners and rear extensions
- Intermediate rafters added on longer lengths
- Stock anthracite, black or white, or any RAL
Delivery and fitting in Dartford
We confirm the delivery cost and date for DA1 on your quote. Lanterns arrive palletised, with the glass packed separately.
Fitting in Dartford can be quoted on request by installers working under S&K, subject to cover for your postcode.
Delivery to DA1 is standard mainland delivery, priced for your postcode and confirmed in writing before you order.
Rectangular roof lantern prices for Dartford
Typical guide prices for rectangular roof lanterns, supply only and including VAT:
| Kerb size | Roof area | Guide price | Configure |
|---|---|---|---|
| 1000 × 1500 mm | 1.50 m² | £1,295–£1,495£1,079 ex VAT from | Configure |
| 1000 × 2000 mm | 2.00 m² | £1,495–£1,795£1,246 ex VAT from | Configure |
| 2000 × 3000 mm | 6.00 m² | £3,195–£3,695£2,662 ex VAT from | Configure |
| 2000 × 4000 mm | 8.00 m² | £4,095–£4,795£3,412 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 Dartford
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 in Dartford 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 Dartford
Does a longer lantern need extra support?
Long lanterns use intermediate rafters inside the lantern itself. The roof structure around the opening must be designed to carry the lantern's weight; your builder or engineer sizes the trimmers.
Which way should the ridge run?
The ridge runs along the longer side. On a square opening there is no ridge and the lantern becomes a pyramid.
Do I need planning permission for a roof lantern in Dartford?
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.
Is it worth having solar-control glass in Dartford?
With the midsummer sun about 62.0° high at noon, roof glass in Dartford gets strong summer sun. Solar control is recommended for large or south-facing lanterns.