Roof lanterns in Dolgellau: what is involved?
Roof lanterns in Dolgellau means hipped glass lanterns that lift the ceiling of orangeries and extensions. We cover the LL40 district and the rest of Gwynedd, with a survey before any price is fixed.
Many Welsh homes have older single-storey rear extensions where a glass rooflight brightens a dark kitchen. Typical uses for roof lanterns include rooms that need height as well as light.
Dolgellau sits about 17 km from Machynlleth and 27 km from Porthmadog, and we cover the whole LL40 postcode district and the roads in between.
Specification options
- LED lighting in the plaster box
- Internal and external colours
- Rectangular, square or bespoke sizes
- Aluminium or uPVC systems
- Solar-control or self-cleaning glass
- Double or triple glazed with solar-control options
- Slim aluminium bars, more glass
What to check first
- Needs a strong, level kerb or upstand
- Larger lanterns may need a steel or timber ring beam
Planning, building control and Dolgellau
In Wales a rooflight on a house is usually permitted development if it stands no more than 15 cm proud of the roof, except on protected land such as conservation areas and National Parks, where permission is needed. Listed buildings need listed building consent from the council, and flats have no householder permitted development rights.
Approved Document L in Wales (2022 edition) sets 2.2 W/m²K for rooflights, measured horizontally, and 1.4 W/m²K or Band B for roof windows in existing homes. A revised Welsh Approved Document L takes effect on 4 March 2027; rooflights in new dwellings stay at 2.2 W/m²K.
See our building regulations guide for U-values, glazing limits and self-certification.
What do roof lanterns cost in Dolgellau?
These are typical supply-and-fit ranges. For an address in Dolgellau, scaffold, a hoist for heavy glass, or a new structural opening can move the figure, which is why we survey first.
| 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 |
From enquiry to finished job
- Get in touch. Use the form, WhatsApp or the guide-price tool with your Dolgellau address.
- Survey. We measure the opening, check the roof build-up and agree the options.
- Written price. You receive a fixed price listing the unit, the work and the lead time.
- Fitting and handover. We install, clean down and leave product and warranty documents.
Nearby towns
More we do in Dolgellau
Roof lanterns in Dolgellau: questions
Aluminium or uPVC?
Aluminium gives slimmer bars and a longer life; uPVC costs less. We fit both.
Do roof lanterns get hot?
They can in summer if clear glass is used on a south-facing roof. Solar-control glass and an opening vent make a big difference.
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.
How do I book a survey in Dolgellau?
Send your postcode and, if you can, a photo of the roof and the room. We offer a survey date when we reply.
Is the survey in Dolgellau free?
Yes for new installations. Repair visits are charged, and we tell you the price before we book.
