A repair may depend on reaching the fixing side of the fence. Explain available access and any neighbour or property-manager permission required. Do not assume entry to another property is included merely because the damaged board faces your garden.
Identify how many palings are affected and where they have detached. Refixing may be possible when the boards and rails remain sound. A moving fence section needs a wider assessment rather than simply adding more screws through the visible boards.
A timber repair and a coating job are separate parts of the scope. Ask whether any finish preparation is included and follow material guidance. Repeated deterioration should prompt a review of exposure and support rather than repeated cosmetic replacement alone.
The agreed service covers suitable local paling reattachment/replacement and compatible fixing review. Exclusions: Post repair (existing intent), major panel/fence replacement, retaining structures, boundary disputes, pool barriers, unstable supports.