Police say the damage was caused sometime between Tuesday 9 February and 18:00 on Monday 15 February, when it was noticed.
The wall is suspected to have been hit by a vehicle some time between these dates, causing a large stone to dislodge and a crack in the wall.
Police are appealing for any witnesses to this incident to come forward.
Any information can be passed on by calling PC 115 Blondel at the Police Station on 725111 or by calling Crimestoppers anonymously on 0800 555 111.
Pictured top: Rue de La Ronde Cheminee, Castel.