Thames Water has written to local residents to advise they have started survey works on Norwood Road from Robson Road (West Norwood end) to the junction with Christchurch Road (south circular road; Tulse Hill gyratory).
The current survey works will be carried out overnight (10pm-5am) Sunday to Thursday in stages and should be completed by Friday 14 December.
Thames Water states they may need to turn off the water supply at local addresses, but if so they will advise in writing beforehand.