What should a roof window be like on a Welsh slate terrace?
The town keeps much of its Victorian and Edwardian terraced housing. Terraces of that age in Lancashire mill towns are typically red brick under Welsh slate, and a roof window in a slope like that has to be specified for the covering, because the join between window and slates is where a roof is most likely to go wrong.
Matched to slate
Slate needs a flashing kit designed for it, so the slates are lapped properly around the frame. We look at the slates closely at the survey, because a roof that has been patched over the years may have slates of mixed age, and that affects how neat the finished window will be. Our note on flashing for slate and tile explains the kits.
Which slope
The rear slope is the usual choice for a loft room, and it keeps the front elevation as it was. If a window must go on a slope that faces the side, the planning guide sets out extra conditions, so we raise it early. Read the planning guide before the layout is fixed.
Rooms that stay narrow
A terrace loft is long and thin. A window in the rear slope lights one end, so the position of the stair matters as much as the window. If the head of the stair comes up near the window, the room works. If it comes up in the middle, the window may sit over the bed instead. We work it through with you at the survey, so the furniture fits and the handle falls where a hand can find it.
Handle and blind
On a steep slope the window can be tall, with the handle at a fixed height. If it is in a bedroom used daily, an electric or solar opening saves climbing on a chair, and the blind can run from the same handset. A study or a landing can make do with a pole. Blackout is the usual choice for sleeping, and a pleated blind suits a room with a desk.
A loft that becomes a room
A bedroom in the roof needs a safe way out of the house, and the Building Regulations guide covers the requirement. Where the work is notifiable, we handle the notification for the windows we fit.
Terrace roof window, a quick view
- Covering
- Welsh slate over red brick
- Flashing
- Kit made for slate, lapped round the frame
- Position
- Rear slope, checked against the stair
- Opening
- Pole, or handset for daily use
- Blind
- Blackout for bedrooms, pleated for a desk





