How we approach roof lanterns in Islington
Thinking about roof lanterns in Islington? The short answer: hipped glass lanterns that lift the ceiling of orangeries and extensions. The longer answer depends on your roof, which is why we survey before we price.
Victorian and Edwardian terraces with narrow side returns are typical of much of London, and a glass roof or long flat rooflight is the usual way to keep the back rooms bright once the return is built over. Roof lanterns suit rooms that need height as well as light.
Islington is around 3 km from central London, and we survey and fit throughout that part of Greater London, including the N1 district.
What you can choose
- Opening vents with electric control
- Solar-control or self-cleaning glass
- Internal and external colours
- LED lighting in the plaster box
- Rectangular, square or bespoke sizes
- Slim aluminium bars, more glass
- Can include opening vents
What to check first
- Larger lanterns may need a steel or timber ring beam
- Needs a strong, level kerb or upstand
Planning and building rules for Islington
English householder permitted development (Class C) normally covers rooflights that stand no more than 0.15 m proud of the roof plane and stay below the highest part of the roof. Listed buildings need listed building consent, flats have no householder permitted development rights, and an Article 4 direction can remove the rights in some conservation areas.
Building Regulations Approved Document L sets a limiting U-value of 2.2 W/m²K for new or replacement rooflights in existing homes, measured in the horizontal plane; roof windows need 1.4 W/m²K or a Band B energy rating. The Future Homes and Buildings Standards, published in March 2026, apply from 24 March 2027 and keep the 2.2 W/m²K limit for rooflights.
Our planning guide covers each nation in more detail.
What do roof lanterns cost in Islington?
Prices below are shown including and excluding VAT. In Islington, as elsewhere, making good inside and access equipment are the main variables.
| Option | Guide price inc VAT | Ex VAT |
|---|---|---|
| Large or bespoke aluminium lantern | £5,995 – £10,795 | £4,995 – £8,995 |
| Mid-size aluminium lantern (2 × 3 m) Typical | £3,955 – £5,995 | £3,295 – £4,995 |
| Small lantern (1 × 2 m) | £2,995 – £3,955 | £2,495 – £3,295 |
What happens next
- Send the details. Postcode, rough size and a photo of the roof and room.
- Measure and check. A surveyor visits Islington, measures and checks structure and access.
- Agree the quote. You approve the specification and price before anything is ordered.
- Installation day. Usually one day into a prepared opening, longer for new openings.
Nearby towns
More we do in Islington
Questions about roof lanterns in Islington
Do they leak?
Modern lanterns are sealed systems. Leaks usually trace back to the kerb or roof membrane detail, which we form and check ourselves.
Can a lantern go on an existing extension?
Yes, if the flat roof structure can be opened up and trimmed. We check joists and the roof build-up at survey.
Roof lantern or flat rooflight?
A lantern adds height and sky from all sides; a flat rooflight is lower-profile and cleaner from outside. Our guide compares them in detail.
Do I need to be at home for the survey in Islington?
Yes — someone needs to let us into the room below and, where possible, show us how the roof is reached.
How do I book a survey in Islington?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
