Attics under tile
A typical Bruton cottage has a bedroom under the roof with one small window in the gable or none at all. These rooms are warm in summer because heat enters through the tile and has nowhere to go. A rooflight on the side that cannot be seen from the street gives air a route out and the room a view of sky. Because it lies behind the ridge from the lane, it seldom affects how the building reads from outside.
Long, low roofs such as those on almshouses and school buildings have their own logic. A single large opening would dominate the slope, so the better plan is a pair or a row of slim units spaced to follow the rafters. They light a long attic evenly and give cross-ventilation along its length. Where the building is listed, the number, size and position of each unit are part of what is agreed with the council.
The work itself is exact. Old roofs seldom have rafters at standard spacing, and tiles of different ages sit in the same slope. We open the roof carefully, keep the tiles that can be reused, frame the opening so the load is carried properly and flash the new unit with lead or a matching kit. A whole new rooflight, frame included, counts as building work that Building Control must be told about, and we make that notification. The Building Regulations guide says what falls under it.
Stone and clay tile also need a particular kind of flashing. On a tile roof the unit is surrounded by a kit that overlaps the tiles on all four sides, so water runs over the joints and off. On a slate roof the flashing is often formed in lead. We choose the type before work starts and say which on the quote, so you know what goes on your roof.
Access shapes the work in a place like this. Some of the lanes are narrow, and a delivery van cannot always reach the door. We plan how glass and materials arrive, protect floors and furniture inside, and close the roof in each evening so the house is weathertight overnight. It is a small matter on a plan and a large one on the day.
One more note about the character of these roofs. A stone house under tile can feel airless on the first hot night of the year even if the walls are cool. An opening unit in the roof acts early. It releases the warm layer before the rooms below take it on, so the benefit shows by evening.