Large roof lanterns
Large roof lanterns, from around 3 metres long up to about 6 metres on some ranges, bring daylight deep into open-plan kitchens and living spaces. At these sizes the lantern uses intermediate rafters, and the roof structure, delivery and lifting all need planning.
Get a price for a large roof lantern
Send your kerb size and we will reply with a fixed written quote.
In short: Lanterns of three metres and more for open-plan extensions, with intermediate rafters. Guide prices start from £2,595 including VAT, supply only.
What changes when a lantern gets big?
Above roughly 3 m long or 2.5 m wide, ranges add intermediate rafters to support the glass. Glass units get heavier and the lantern can weigh several hundred kilograms, so your builder or engineer needs the lantern weight to size the trimmers and beams around the opening.
Delivery is also different: a large lantern arrives as a frame kit with separate glass, and lifting it onto the roof needs enough people or lifting equipment. We give you the approximate weight with the quote so you can plan it.
How much glass is too much?
In England, building regulations guidance generally expects the total area of windows, rooflights and glazed doors in an extension to stay at or below 25% of the extension's floor area plus the area of any openings it covers, unless energy calculations show the design still complies. A large lantern can use up most of that allowance on its own, so check your design with your designer or building control body early.
What does a large lantern cost?
Guide prices below include VAT for supply only. Large lanterns benefit most from solar-control glass, which adds roughly 10% to the lantern price.
Large roof lantern prices by size
| Kerb size | Roof area | Guide price | Configure |
|---|---|---|---|
| 1500 × 3000 mm | 4.50 m² | £2,595–£2,995£2,162 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 |
| 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.
What you get
- Lengths
- From about 3 m to around 6 m, range dependent
- Structure
- Intermediate rafters on larger sizes
- Weight
- Several hundred kg on the biggest sizes
- Glass
- Solar control recommended
- Delivery
- Frame kit plus separate glass on pallets
Three checks
- Measure the outside of the kerb, width then length, and check the diagonals. How to measure.
- Check the glazing allowance for your extension and whether you need planning permission. See building regulations and planning.
- Plan the lift. Your quote gives the approximate weight so your installer can plan access and lifting.
Large roof lanterns: common questions
What is the biggest roof lantern you can supply?
It depends on the range. Some go to about 6 m by 4 m with intermediate rafters. Send us your kerb size and we will confirm what can be made.
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.
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.
How is a large lantern delivered?
On pallets, usually with the frame and glass packed separately. The heaviest single item is normally a glass unit, which needs two or more people to lift safely.
Large roof lanterns by area
We deliver large roof lanterns across mainland Britain. Choose your area for local delivery and regulation notes.
England
- Bedfordshire
- Berkshire
- Bristol
- Buckinghamshire
- Cambridgeshire
- Cheshire
- Cornwall
- Cumbria
- Derbyshire
- Devon
- Dorset
- County Durham
- East Riding of Yorkshire
- East Sussex
- Essex
- Gloucestershire
- Greater London
- Greater Manchester
- Hampshire
- Herefordshire
- Hertfordshire
- Isle of Wight
- Kent
- Lancashire
- Leicestershire
- Lincolnshire
- Merseyside
- Norfolk
- North Yorkshire
- Northamptonshire
- Northumberland
- Nottinghamshire
- Oxfordshire
- Rutland
- Shropshire
- Somerset
- South Yorkshire
- Staffordshire
- Suffolk
- Surrey
- Tyne and Wear
- Warwickshire
- West Midlands
- West Sussex
- West Yorkshire
- Wiltshire
- Worcestershire
Wales
Scotland
- Aberdeen and Aberdeenshire
- Dundee and Angus
- Argyll and Bute
- Ayrshire
- Dumfries and Galloway
- Edinburgh and the Lothians
- Fife
- Forth Valley
- Greater Glasgow
- Highlands and Islands
- Lanarkshire
- Moray
- Perth and Kinross
- Scottish Borders