The short answer
Nobody can date a roof from the road, but Clifton Hampden has cottages from the late sixteenth and early seventeenth centuries, and the structure beneath their coverings may be original. That timber needs careful inspection, because repairs to old frames are different from repairs to modern trusses.
Old roofs are rarely a single age. The frame may be four hundred years old, the battens a century younger and the covering whatever the last owner could afford. When we survey a cottage of that sort, we are reading layers.
Q1.1Why does the roof timber matter more than the tiles?
Because the tiles are replaceable and the frame is the building. If a rafter foot has rotted where it meets the wall plate, new tiles on top will only hide the problem for a season. We look from inside the loft wherever we can reach, probe the timber with a screwdriver blade, and photograph anything that moves or feels soft.
Q1.2Will repairs make the roof look new?
Not if we can help it, and it should not. On a house of this age, patched areas should blend with the weathered tiles around them, so we match tile size, colour and texture, and reuse sound existing tiles on the visible slope where we can. The pitched roofing page explains the different coverings.
Q1.3Does the whole roof have to come off?
Rarely. Repairs confined to the leaking area, with sound tiles reused around it, protect both the building and the budget. If the battens have gone along a full slope the answer changes, and the survey photographs will have shown you why before we say it.
Q1.4Should an old roof be insulated?
Often it can be, but not with anything that traps moisture against old timber. Good ventilation matters more in a historic roof than a thick layer of insulation, and a poor choice can cause the rot you were hoping to avoid. We will say so if a plan looks risky, and suggest asking a conservation specialist where a building is listed. A loft that has stayed dry for centuries can be upset by one well-meant change, which is another reason to look before you act.