Skylight and rooflight fitting in Pontyberem

Carmarthenshire's Gwendraeth Valley holds Pontyberem, a village that is also a community. The name is put together from three Welsh elements, and the pieces tell you where the settlement stands: pont is a bridge, aber is the mouth of a river or the meeting of a smaller stream with a larger one, and Beran is Nant Beran, the brook that flows through the village.

Two census counts frame the recent past: 2,829 residents were recorded in 2001, and the next count, taken in 2011, found 2,768. The village grew in the late 19th and early 20th centuries as coal mining expanded around it. Four principal mines worked in the area: Pontyberem colliery, which opened in 1845; Pentremawr, from 1889 until about 1974; Glynhebog, from 1892 to 1949; and Gwendraeth colliery, known as the Watney pit. With the coal industry in the South Wales Coalfield in decline, no high quality anthracite mines operate in the Gwendraeth Valley now.

The railway ran through for a while, too. From 1909 to 1953 the village had its own station, part of the Burry Port and Gwendraeth Valley Railway, and it carried the miners as well as the residents of the locality.

The village is north-west of Swansea, 16.74 miles away by road, well within the area we cover. We fit in neighbouring Pont-henri and Tumble too.

None of that history tells us what the roofs are like. What it does say is that the village grew over several decades, and one glass will not suit houses of every age. Our survey begins with whatever roof is actually there, whichever decade built it.

Few rooms put a roof window under as much strain as a bathroom does. A hot shower fills the air with water within minutes, and the glass overhead is the coldest thing it meets. If that glass is poor, you get a drip on the bath and a dark patch on the lining by spring.

Three things help, and all three are cheaper to settle before the window goes in than after. The first is the glass itself: a new or replacement roof window in Wales should reach 1.4 W/m²K or Window Energy Rating Band B, and a warmer inner pane gives the steam less to cling to. The second is the opening: a sash that tilts or pivots lets the humid air out fast, and a top-hung one can be left slightly ajar. The third is a fan, because a fan can clear a room that glass alone cannot.

The vents have numbers attached. Where the old window had none and the house depends on natural ventilation, the guidance offers a route to show the home is no worse off, and it works by area. The table gives the two sizes, and where they cannot be met the vents should come as near as practical.

Quick airing is a separate duty. Each habitable room needs purge ventilation, the guidance's name for a quick change of air, and a window that opens can deliver it. Counted by angle, a sash that opens 30° or beyond should present an opening of a twentieth of the floor area; one that opens between 15° and 30° should present a tenth; and below 15° it does not count.

Bedrooms present a quieter version of the same problem. People breathe out water overnight, and a loft room has one cold surface in the roof. Trickle vents matter there. If your old window had them, the new one should have vents no smaller, controllable by you or automatically.

For a bathroom with no outside wall at all, a window in the roof is not always the answer. A sun tunnel brings daylight down from a roof dome through a reflective tube, and the opening it needs in the roof is small. The bathroom still wants its extractor.

A flat-roofed extension has its own version of the problem. An energy-efficient rooflight or a lantern over a kitchen sees the cooking steam, and a rooflight in an existing home should reach 2.2 W/m²K. The survey checks the rated figure for the unit we propose.

The fan and the window do different jobs, and it helps to keep them apart. A fan removes damp air at its source, which is the shower or the hob. A roof window lets the whole room refresh once the steam has gone. A bathroom with both has the best chance of a clear pane afterwards.

Electric operation earns its place in a bathroom with a high roof window. A switch on the wall opens the sash from the floor, and a VELUX solar or electric model closes itself if rain starts, which matters when the window is the room's only way to air out. See electric opening rooflights for what to ask about.

For planning, a Pontyberem address answers to Carmarthenshire County Council. The Gower AONB does not include the village, so no protected-landscape rule of that kind applies. The rest of the question is covered on our page about planning permission for skylights in Wales.

A house has householder rights that a flat or maisonette lacks. A council may have removed those rights by an Article 4 direction, and a planning condition can do the same for one house. A listed building needs listed building consent for work that touches its character, a requirement now under the Historic Environment (Wales) Act 2023 and administered by the council, with Cadw as the Welsh Government's historic environment service.

If a case sits on a boundary, the council's planners can confirm where it falls, and a Lawful Development Certificate records the decision.

The Building Regulations are the other approval. They look at the structure around the opening and at the energy performance of the glass. Our part is to see the notification through on jobs that are notifiable. The body it goes to is your choice between the council's own building control and a registered building control approver.

The route is simple enough to state in a line: a free survey, a fixed written quote, then work backed by a workmanship guarantee that runs for ten years, in writing. Call 01792 929062 or ask for the survey on the enquiry form.

One point needs separate treatment. A lantern is not the same as a rooflight when it comes to the Welsh energy figure, because the 2.2 W/m²K limit is written for a glazed unit on a kerb or upstand and does not mention lanterns by name. If a lantern is planned for a new extension, we confirm how the council will treat it before the design is fixed.