Skylights and rooflights in Aberdare

Aberdare is a town in the Cynon Valley area of Rhondda Cynon Taf, at the confluence of the Rivers Dare and Cynon. The name means the mouth or confluence of the river Dare, since the town lies where the Afon Dâr meets the Cynon. Dâr is an archaic Welsh word for oaks, and the valley was noted for large, fine oaks as late as the nineteenth century. A mid-2017 estimate put the population at 39,550.

Tradition names the area as the scene of the battle of Hirwaun Wrgant, where the allied forces of the Norman Robert Fitzhamon and Iestyn ap Gwrgant, the last Welsh prince of Glamorgan, defeated Rhys ap Tewdwr, prince of Dyfed. The settlement of Aberdare dates from at least that period. The first known reference to Aberdare is in a monastic chapter of 1203 about grazing rights on Hirwaun Common. The place began as a small village in farming country, centred on the Church of St John the Baptist, said to date from at least 1189.

By the middle of the fifteenth century Aberdare had a water mill and a number of thatched cottages, though no evidence of the cottages remains. The earliest Welsh Independent, or Congregationalist, chapel in the area was Ebenezer, Trecynon, even though meetings had been held from the late eighteenth century in houses nearby, including at Hirwaun.

A branch of the Glamorganshire Canal opened in 1811 to move the area's goods, and then the railway became the main route to the coast. The coal was valuable for steam railways and steamships, so an export trade began by way of the Taff Vale Railway and the port of Cardiff.

Reaching Aberdare from Swansea means 28.39 miles of road eastward, a distance that leaves Aberdare within the area we survey, which stretches 30 road miles out from Swansea. Among the places we work in near it are Gelli and Glynneath.

A town with a church said to date from the twelfth century, a mill from the fifteenth and a canal from the nineteenth holds buildings from many different eras. A rooflight job reads each roof as it stands. The pitch, the covering and the room below decide the product, and the survey records all three.

Start with the map. The Welsh Government's conservation-area boundaries include one named Aberdare Town Centre, and the point we use as the middle of the town lies inside it. That is as far as a map can go. It shows districts and cannot sort one house from the next, so the council has to confirm a particular address. Rhondda Cynon Taf County Borough Council holds that answer for every Aberdare address.

For a house inside the boundary, the rule is plain: a new rooflight needs planning permission. Outside it, a house may be able to use householder rights, provided it keeps within the limits listed in our Wales planning guide. A flat or maisonette cannot use those rights at all, and an Article 4 direction, or a condition on a house's original permission, can take them away from a house.

Next come listed buildings. If a rooflight would touch what makes a house special, listed building consent enters the picture, with the Historic Environment (Wales) Act 2023 behind it. The council receives the application as planning authority.

Glass for an older roof deserves its own thought. Our conservation rooflights page describes the version made with such roofs in mind, and in a planning decision the look of the glass is part of the discussion.

Where a map and a house seem to disagree, the planners settle it. Ask the council for its view, and apply for a Lawful Development Certificate if a written record is wanted.

Building Regulations follow their own rules. A new rooflight normally calls for approval, since the roof structure is opened and the unit's weight has to be carried, and near a boundary the fire performance of the glass is weighed too. Replacing a roof window with the same kind is building work, while a plain repair is not.

Two bodies can check the work. One is the council's building control team. The other is a registered building control approver, a private firm that has to be registered with the Building Safety Regulator under a regime that began in Wales on 6 April 2024. If the work is notifiable, the notification goes through whichever body you choose, and we prepare it.

Match the product to the roof. On a pitched slope, a roof window lies level with the slates or tiles. For a new or replacement one, Approved Document L (Wales) sets the target at 1.4 W/m²K, or Window Energy Rating Band B. Older homes whose character would suffer get a way out for windows and roof windows, either 1.2 W/m²K at the centre of the pane or low-e secondary glazing.

Over a flat-roofed extension, a flat roof rooflight on a kerb is the match, with a target of 2.2 W/m²K and no way out for older homes. Lanterns sit apart. The guidance's definition of a rooflight is a unit on a kerb or upstand, and lanterns go unmentioned, so on a new extension the council hears about a lantern before one is ordered.

Where a hall or landing has no outside wall, the answer is a sun tunnel. The dome on the roof collects daylight, the tube sends it down through the loft space, and the diffuser throws it across the ceiling of the dark room below.

Building work, in the Welsh guidance, includes a straight swap of one window for another. Mending a window falls outside it, and for the energy rules so does fitting new glass into a frame that stays. For a sealed unit that has clouded, our misted rooflights page explains the options.

Size matters for two reasons. The U-value of a rooflight is measured over the entire developed surface of the unit, so the glass area in the roof can understate the area that counts, and a kerb sold with the unit sits inside the 2.2 limit. Separately, a newly made or enlarged opening has to respect a ceiling on how much of the floor area the windows and doors together may cover, and the edition due on 4 March 2027 lists both roof windows and rooflights as part of the count, with a larger area allowed if the home's energy performance is raised to offset it.

Air has to be kept in view as well. A new frame should not leave the home worse ventilated than the old one did, so trickle vents in the old frame should be matched by vents of equal or larger size. Habitable rooms need a quick-airing route, and an opening roof window can serve as one.

Loft rooms raise escape and safety. A roof window works as an escape route only where it is sized and placed for that, as the roof window regulations page describes. Glass low in a wall falls under Approved Document N, the Welsh rules on glazing safety, which treat the lowest stretch of wall as a critical location.

The free survey comes first and the fixed written quote after it. The guarantee on the work is ten years, in writing. Ring 01792 929062 or send the form.