Skylights and rooflights in Llandybie

Llandybie, spelt Llandybïe in Welsh, means Saint Tybie's church. The village is in Carmarthenshire and is also the name of a community. The A483 is its main road, and Llandybie station is on the Heart of Wales Line.

Counted in 2001, the village itself had 3,800 people. The wider community, which also takes in Blaenau, Caerbryn, Capel Hendre, Cwmgwili, Pentregwenlais, Penybanc, Pen-y-groes and Saron, had 8,800, and the figure rose to 10,994 at the 2011 census. That makes the community a good deal larger than the village at its heart. In 2021 the Census put the Llandybie built-up area at 2,563 residents.

The village has some history to its name. The mineral Brammallite was found in Llandybie for the first time in 1943, and the National Eisteddfod of Wales came here in 1944.

Swansea is 18.46 miles away by road, with Llandybie to the north, which puts it comfortably within range of our visits. Near neighbours include Blaenau, Saron, Ammanford and Penybanc, and we work in all of them.

A community that size can hold roofs from many periods: old roof windows that have seen decades of weather, or newer flat-roofed extensions where a kerbed unit would do the work. Nothing is assumed about yours. A survey reads the roof, the room under it and the weather it has to face, and the glass follows from that.

Welsh guidance sets two figures, and mixing them up is easy. A new or replacement roof window in an existing home should achieve a U-value of 1.4 W/m²K, or Window Energy Rating Band B. A new or replacement rooflight should achieve 2.2. Approved Document L (Wales) describes a rooflight as a glazed unit installed out of plane with the roof, on a kerb or upstand. A roof window sits in the plane of the surrounding roof.

The distinction is not academic. A roof window in a loft room, flashed into the slope, is held to the tighter limit of the two. A kerbed flat roof rooflight is held to the higher one. Homes of architectural or historic interest get a gentler fallback for roof windows, 1.2 W/m²K at the centre of the pane or low-e secondary glazing, and rooflights get no such allowance. The guidance does not mention roof lanterns by name, so a roof lantern is a question we settle with you and the building control body, not by quoting a number for it.

For a rooflight, the calculation covers the developed surface of the whole unit, which is a larger area than the hole in the roof. Buy the kerb as part of the rooflight and the 2.2 limit covers the kerb as well.

The glazing makes the difference. Double or triple glazing is available for flat and curved glass rooflights from VELUX, a choice that matters most in living rooms where warmth and quiet both count. A bedroom might take a laminated inner pane, and a unit up on a high slope might take an easy-clean coating. The energy-efficient rooflights page goes through the options in detail.

Putting a new roof window where an old one was, at the same size, is still building work, so the Welsh figures matter even when the opening stays where it is.

Sometimes the better move is replacement. When the seal between the panes fails, the glass clouds, and the room loses clarity. We handle misted rooflight replacement, and a new unit should meet the Welsh figure for its type.

Carmarthenshire County Council decides planning questions for Llandybie, and Llandybie lies outside the Gower AONB. Whether a rooflight needs an application is explained in our Welsh planning permission guide for skylights. If you are unsure, the council's planning team will say what applies, and a Lawful Development Certificate turns that answer into a formal one.

The starting position varies. Householder permitted development rights do not exist for flats and maisonettes at all, and for a house the council can withdraw them by Article 4 direction or by planning condition. Where a house is listed, work affecting its character as a building of special architectural or historic interest needs listed building consent, and that application goes through the council.

Cadw, the Welsh Government's historic environment service, explains that listed building consent reaches inside the building as well as outside, and that even minor work can need it. Going ahead with no consent in place can amount to a criminal offence. Cadw also says that replacing traditional windows with uPVC on a listed building will not normally be acceptable. If your house is listed, check before you ask for a quote on anything that touches the roof or the ceiling below it.

For the rest, the sequence is simple enough to remember. Find out what planning says about your house, find out whether the work is notifiable, and book the survey. The first two answers help the third, and we can talk them through when we come.

A lantern added to a flat roof already in place is likely to need planning permission, since it usually stands tall on its upstand. One planned into a brand-new extension raises a point the national rules leave open, so we put it to the council.

Building Regulations have a different logic. The regulations call windows, roof windows and rooflights controlled fittings, which makes fitting one building work, and for a new rooflight approval is the general expectation. The route is a choice: local authority building control, or a registered building control approver. Notifiable work? Then we send the notification.

That leaves the visit, the quote and the guarantee. Surveys cost nothing and come first. A fixed written quote follows, and after the work a 10-year workmanship guarantee arrives in writing. Book a survey or call 01792 929062.