How much to repair retaining wall?

[Henrico]

Just got a building survey back on a house in looking to buy and was trying to find costs of repairing a retaining wall in front of a house. Had no luck with figures online. Anyone got any ballpark figures of how much a 4m wide 1m high retaining wall may cost to repair that currently has cracks down the front, deboned render and spalled brickwork? It's about 2m from the front of house which is on quite a steep hill.

Many thanks

[Henrico]

I wasn't sure what information would be useful. Good to know the boundaries of cost though, thanks.