Skylights and rooflights in Glais

Glais is a semi-rural village in Swansea. It lies north-east of the city, and the road distance is 6.37 miles. The 2021 census estimates put the village population at 831 residents.

The landscape comes with a Welsh name and an Ice Age history. The moraine, named Y Garth, is regarded as the largest and most impressive of the South Wales valley moraines, and the site includes a natural wall that drops 130 feet at the front of the moraine, formed from material deposited from further up the valley during the last Ice Age.

The village has a railway past, too. Glais has previously hosted two railway stations, both part of the Swansea Vale Railway. In 1891 a Welsh Baptist chapel, Peniel, was built on Station Road, and it closed in 1999. More recently the community centre was refurbished in 2021, and in 2025 its committee worked to fund a new outdoor seating area with benches and daffodil planters.

Glais is one of the places we cover around Swansea. Close neighbours include Clydach, Alltwen and Pontardawe, all three inside our working area.

Those details tell you about the place and nothing about the roofs. Roof shapes decide the product here as anywhere. A pitched slope suits a roof window. Over an extension, a flat roof calls for a kerbed rooflight or a lantern. A hall or landing without a window suits a sun tunnel. Where a home is a flat, the first question moves from glass to permission, and the next chapter takes that up.

The village pub closed permanently in October 2025 and has since been converted into private flats. That recent change is a useful reminder of how a home's type steers the planning route. Permitted development for a rooflight is a householder right, and it belongs to houses. Flats and maisonettes fall outside householder rights, so a rooflight on a flat has no householder permitted development route. The Welsh Government's page on planning permission for flats and maisonettes explains the position.

City and County of Swansea Council decides planning applications for Glais. For a house, the first thing to settle is whether it stands on protected land. A new rooflight in the roof slope of a house in a conservation area, the Gower AONB, Bannau Brycheiniog National Park or a World Heritage Site needs planning permission, and Glais itself is outside the Gower AONB. Our Wales planning guide for skylights covers the conditions for a house on any other land.

Even then, rights can be removed. A council may remove them with an Article 4 direction for an area, and so can a condition attached when the house first got permission. A listed house falls under the Historic Environment (Wales) Act 2023, and a rooflight that would change its character needs listed building consent from the council. That consent covers work inside as well as outside, including historic fixtures, fittings and details, so even small jobs can need it, and doing the work without it may be a criminal offence. Cadw, the Welsh Government's historic environment service, publishes each listed building record in Cof Cymru. Cadw's guidance on consent says what counts.

The council's planning team will say where an address stands, and for anyone wanting certainty before work starts, the council's Lawful Development Certificate gives the formal answer.

Building Regulations are a second matter. Building Regulations approval generally comes into play for a brand-new rooflight, since the opening usually alters the roof and the roof must take the load. For notifiable work, we handle the Building Regulations notification with local authority building control or a registered building control approver. If a loft is to become a bedroom, the escape rules apply as well, and our Building Regulations guide for skylights sets out what they ask.

Where a roof already carries glass, replacing it is a different job from fitting it new. The first step is to find out what is there. Open the sash of a VELUX roof window and look along its top edge, where a metal type sign carries the size code. Windows VELUX made after 1968 all carry one, and the code records width and height. VELUX publishes the sizes, for example MK04 at 78 by 98 cm and MK06 at 78 by 118 cm.

A swap changes the paperwork a little. Exchanging a window or roof window for its equivalent counts as building work, whereas a repair does not, and renewing just the glass while the frame stays falls outside the energy rules. When a whole roof window is replaced in Wales, the new one should meet 1.4 W/m²K or Window Energy Rating Band B under Approved Document L (Wales). A rooflight on a kerb should meet 2.2 W/m²K.

A rooflight whose glass has gone cloudy inside is one reason to start. Misting inside the glass usually means the seal has failed, and our misted rooflight replacement deals with exactly that. A bathroom roof window that steams over on the inside is a different complaint. That points to ventilation, and an extractor that runs long enough may solve it without any glass changing.

Older homes bring a further option. Where a replacement window or roof window on a home of architectural or historic interest cannot reach 1.4 W/m²K, Approved Document L (Wales) allows a fallback of 1.2 W/m²K at the centre of the pane, or low-e secondary glazing. There is no such fallback for rooflights.

Replacement brings a ventilation rule with it. Approved Document F (Wales) asks that a replacement leave the home's ventilation as good as it was, so trickle vents in the old unit mean vents no smaller in the new one.

Over the extension, the same logic holds. Over a roof with no pitch, the options are a flat roof rooflight set into a low frame, or a roof lantern standing taller, and we fit and replace both kinds. Either needs the roof around it to shed water, so the roof deserves a close look alongside the room. A lantern for a brand-new extension goes to the council for confirmation. In the hall, a sun tunnel asks for the least from the roof.

Each job starts with a free survey. Then comes a fixed written quote, and the finished job comes with our written 10-year workmanship guarantee, handed over once the glass is in. Call 01792 929062 to arrange a visit, or use the online form.