Melbourne is an old market town, recorded in the Domesday Book, and it has roofs to match. The town had a castle in the fourteenth century that was fortified from a royal manor house and never finished, and a pool that once served the mill. Roofs of that age are rarely regular, and a rooflight on one has to respect that.
On an older slope, we use a conservation rooflight where the slope is visible. Its frame is slim and low, and one bar across the glass, and it lies near the covering so the slope keeps its familiar line. Slate, clay tile and stone slate each need a different flashing, and each is cut and dressed to suit.
Inside, the timbers are the issue. Old rafters may be uneven in size or spacing, or have been altered over the years. The opening is laid out around what the loft actually holds, trimmed properly, and the loft floor is checked for the new shaft. A torch, a tape and a camera go up with us at the survey, and the photographs are compared with the plan.
Where a Melbourne covering has gone brittle, the slates or tiles around that opening are swapped for matching ones, so the new unit has sound roof about it.