Atherton's slate terraces built for mill workers suit a rooflight or skylight
Brick terraces under slate, built for the people who worked the cotton mills and collieries, set the scene for rooflight installation in Atherton, alongside inter-war council semis and newer estates on cleared industrial land. A skylight here has to suit a roof that has often been up for over a century.
26.9 road miles east of Liverpool city centre
Which Atherton rooms are waiting for light from the roof?
- The terrace atticIn the attic of a Chowbent or Hindsford terrace, where the loft was boarded for storage and a single slate-roofed slope could carry a bedroom's daylight.
- The mill-worker's back kitchenAt the back of a Howe Bridge terrace, in a scullery turned kitchen under a low lean-to, where a window on the yard is all the light there is.
- The 1930s semi's landingOn the dark upstairs landing of a council-built semi near Hag Fold, shut in by bedrooms either side with the roof space directly above.
Terrace attics, mill-worker kitchens, 1930s landings
Skylight installation in Atherton runs from the oldest brick terraces near the town centre, through the 1930s semis and post-war estates, to recent houses built where mills and pits once stood.
- Lanterns for the broad rear extensions on 1930s semis and newer houses, giving a dining area light that the garden doors alone cannot reach.
- Flat rooflights for the rear outriggers and lean-to kitchens of terraces, with a kerb that lifts the glass above any pooling on the covering.
- Roof windows through the Welsh-slate roofs of Atherton's terraces, flashed to the slate and framed between rafters that were sized a hundred years ago.
- Replacement units for rooflights that were fitted into terrace lofts years ago and have since clouded or begun to let water round the frame.
Cotton and coal laid out these streets, and their roofs
Mills and collieries explain where Atherton's houses went. Rows of brick terraces were put up close to the works for the people who staffed them, so the older parts of town around Chowbent, Hindsford and Howe Bridge are built in long, straight streets with houses that share a party wall and a roof line from one end to the other. The covering is usually Welsh slate, brought in by rail, laid on timber that was cut to the minimum the builders thought safe.
The typical terrace has two rooms up, two down and a rear outrigger, a narrow wing at the back that carries the kitchen below and a small bedroom or bathroom above. The roof over the outrigger is often a lean-to, and many back yards were roofed over at a later date with a flat extension. The main roof space holds a shallow loft, in most cases, reached by a hatch on the landing. Some have been boarded out and some converted, but a good many are still as the builders left them.
Between the wars, the town spread outwards with council-built and private semis. Tiled roofs, frequently hipped and carrying a side chimney, cover those semis, and the landing sits at the centre of the plan with a bedroom on either side. Post-war estates followed the same logic with plainer details, and later development has filled the land that heavy industry left behind with modern estates of detached and semi-detached houses on trussed roofs.
The age of the building matters more than the size when a rooflight is being planned. A hundred-year-old timber roof is not a square, flat plane; ridges dip, rafters twist slightly and the battens may have moved. An opening cut into one of those roofs has to follow the slope as it is rather than as a drawing says it should be.
Lofts in the terraces deserve a closer word. Builders of the period framed them with rafters that run from the wall plate to a ridge board, with a purlin in the larger houses, and the spacing is wide by modern standards. A roof window needs two rafters trimmed and a pair of trimmers across the gap, so the first job is to see where the timbers sit and whether a purlin runs through the planned position. Where it does, the unit moves along the slope, and the room below is planned around that.
Post-war and later houses are simpler. A tiled roof of the 1950s or 1960s has regular rafters, and anything built since the 1980s has trusses at set centres, so a survey can establish early whether a rooflight is straightforward or needs an engineer's calculation for the framing.
In a street of identical terraces, no two roofs are quite the same underneath.
Open ground to the south and what it does to a slate roof
Atherton sits on low ground with open country on several sides. To the south the land runs away flat and wide, so the wind runs across it freely and the flashings are lapped for that, and the moors rise on the far side of Bolton to the north-east. Weather tends to reach town from the west, crossing a lot of open land on the way, and rain on a west-facing slope can be driven hard against the roof. Terraces that stand in a long row take the weather along their whole length, and houses at the end of a row have an exposed gable to deal with.
Slate is a tough covering but it ages. Old slates can be brittle and the fixings that hold them, whether nails or hooks, rust. Fitting a roof window means disturbing the slates around the opening, so we look at the condition of what surrounds the opening before we promise a result. Lifted slates that crack are replaced from a matching stock, and the flashing is built to the slate's thickness and lap, rather than a standard kit, because the cheapest kit does not follow the course of an old roof.
Below the slates, the timber may be clean or it may not. Terrace lofts in industrial towns have had a long history of soot, damp and the odd leak, so we inspect the rafters and battens where the opening will go and say so if any need replacing. The party wall between two terraced houses is also a feature to plan around, because a rooflight must sit clear of it, and so must the trimmers that frame it.
Back roofs are the second concern. Outriggers and lean-tos carry a mix of materials: felt, bitumen, sometimes older corrugated sheet. Before any flat rooflight goes in, the deck has to be sound and carry a kerb, and fitting one to felt or rubber has a page to itself. Where the covering has reached the end of its time, the roof can be re-covered at the same visit, so the kerb is not buried in a new layer later.
Chimneys are the last detail that often affects the choice. Terraces carry a stack at every party wall, and the lead tray and flaunching around each one create a line the new flashing must stay clear of. We position a roof window with a gap on both sides, so no flashing has to cross another.
Access is the other practical matter. Terraced streets leave little room for a scaffold, and a licence is needed to put one on the pavement. From the back yard, or from within the loft itself, a good share of these jobs can be finished without a scaffold, as working on a VELUX from the inside shows.
Front slope of a terrace
- Faces the street and the weather
- Needs the most careful lead and slate work
- Planning position worth checking first
- Often more exposed to the west
Back slope and outrigger
- Hidden from the road
- Easier access from the yard
- Flat or lean-to coverings to assess
- The usual choice for a bedroom window
Wigan Council, protected buildings and the route to a certificate
Atherton is in the Wigan borough, and Wigan Council handles planning for it and the building control that follows. Planning rarely troubles a rear-slope rooflight on an ordinary house, and the permitted development conditions are set out once, in the planning guide. Put the unit on the street side and the position changes; front-slope roof windows are explained on their own page.
The borough has listed buildings and conservation areas, and Atherton has its share of older buildings, including chapels, former mill offices and town-centre properties above shops. We do not guess which streets are protected. Ask at wigan.gov.uk whether a building is listed or inside a conservation area, before you order a unit. A flat above a shop or a converted mill unit has no permitted development rights for a rooflight, so an application comes first. On a protected roof we normally fit a flush conservation unit, and the flush-fit options for protected roofs are laid out in that guide.
For the Building Regulations side, the notification goes to Wigan Council and we file it ourselves, while the rules behind that sign-off are covered in the building regulations guide.
A terrace owner who adds a roof window to a loft that is already insulated will need a unit that meets the current energy limits for existing homes, with the opening framed to suit.
Houses that have been bought from a landlord or built on former industrial land may carry covenants, mining or ground conditions in their deeds. These seldom affect a rooflight directly, but a solicitor's pack from the purchase is a useful thing to have at hand at the survey, together with any previous building control certificates.
| Question | Who decides |
|---|---|
| Planning and protected streets | Wigan Council |
| Listed building consent | Wigan Council |
| Building Regulations sign-off | Wigan Council or an approver |
| Notification paperwork | Dockside Skylights |
Atherton houses and their rooflights
Can a loft in an Atherton terrace take a roof window, given how shallow it is?
Even where headroom is tight, a roof window on the back slope of an Atherton terrace can still light a landing or a small room; ridge height and rafter spacing settle how far that goes. We measure at the survey and tell you honestly what the space will take.
We have a rooflight over the back kitchen of our Howe Bridge terrace that mists up. Do we need a new unit?
Mist between the panes means the sealed unit has failed, and a replacement is the answer rather than a clean. We measure the opening, check the frame and the flashing, and fit a new unit to the existing kerb or upstand, or a fresh one if the old one has weakened.
Is Hag Fold covered by this Atherton page, or Hindsford and Chowbent as well?
Hag Fold, Hindsford, Chowbent, Howe Bridge and the streets around the town centre all come under this Atherton page, so you do not need to look for a separate page for any of them.
Our terrace has a chimney stack on the party wall right where the window would go. Does that rule out a rooflight?
Not by itself. A stack at the party wall has a lead tray and flaunching around it, so the roof window is set with a gap on both sides and no two flashings have to cross; if a rafter or the stack leaves too little room, the unit slides along the slope and the room below is planned around its new position.
Will my old Welsh slates survive having a roof window cut in?
Most of them will, though the slates beside the opening are lifted and a few crack in the process. Those are replaced from matching stock, the flashing is cut to the slate's own thickness and lap, and any rusted nails or hooks we find around the opening are changed at the same visit.
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What happens next: we arrange a survey at a time that suits you, measure the roof and the room, then send a fixed written quote. Nothing is booked until you say yes.