The short answer
We start by finding out how the roof is built, because timber-framed and sarsen houses of the 17th century and earlier rarely have straight rafters or level walls. The repair follows the shape the roof has settled into, uses the smallest intervention that stops the fault, and is photographed before anything is closed up.
The Manor House in West Overton has an early 17th-century west range of sarsen rubble and timber framing, and the parish records thatch, brick and chalk among its materials too. Houses of that kind were built by eye, and four centuries of movement have added to the irregularity.
Q1.1How do we read an old roof first?
Before a ladder goes up, we study the roof from the lane and then from inside the loft. We are checking the lines of the ridge and eaves, the condition of rafters and purlins where they meet the wall plate, and whether daylight or damp shows anywhere inside. Wall plates on timber-framed buildings sometimes sit on rubble or soft mortar, and a roof that has dropped on one side usually tells its story in the loft before it does on the slope.
A tiled or slated slope laid on a frame that has moved cannot be forced flat. New battens are cut or packed to follow the existing plane, so the repaired area does not stand proud of the old one. That is slower than a straight re-batten, but it is what keeps the roof looking right from the lane.
Q1.2When is a small repair enough?
A slipped tile, a split valley or a lifted piece of flashing is repaired where it stands. We use matching materials and mark what was done in the photographs that come with the written quote. When the covering is failing across a whole slope, a strip and re-cover is cheaper over time than patching every year, and the photographs in your quote show why.
Our roof repairs page sets out how we separate a repair from a replacement, and the pitched roofing page covers the tiled and slated slopes that sit on older frames like these.
If the building is listed, tell us when you get in touch. Any alteration that affects a listed building's special character needs consent under the listed building rules, so we agree the method with you, and with Wiltshire Council where it matters, before we price the job.