A slipped slate may still be usable
On older roofs, nail corrosion can let a good slate slide. One or two failures can often be refixed locally using an appropriate method.
Repeated slips mean more than bad luck
If slates are moving in different parts of the same slope, check how widespread the fixing problem has become. Hooks and tabs from earlier repairs are common on roofs that have been maintained for decades.
Replacement slate needs the right size and thickness
A thick slate can lift the course above. A short one loses headlap. Reclaimed slate can be useful where it suits the roof, but appearance alone is not enough.
Need quotes for the repair?
Include previous work in the same area and any access issues such as a conservatory or narrow side passage.
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