Walk Carshalton from Carshalton Ponds and Honeywood Museum outwards and the mainly Victorian pattern is obvious: 33% of the 9,444 households in SM5 live in flats, 67% in houses.
Owner-occupation runs at 76% in Carshalton, so alongside the 16% rental churn there is steady planned work — refurbishments, downsizes and probate clearances booked weeks ahead.
Carshalton substrates run to some of it dry-lined during a later refurbishment, over solid London stock brick — which is what a 33% flat share across the ONS neighbourhood covering Carshalton actually produces. Nothing is drilled until the wall has been sounded, because fixings landing in soft lime mortar joints instead of the brick body on these streets — which is why London Borough of Sutton kerb rules get settled before the van is loaded is the mistake that costs a SM5 customer twice.
Two streets can behave very differently in Carshalton: spring-fed ponds, a village high street and the Wandle's source. The quote reflects the street the job is actually on. Carshalton is outside the Congestion Charge zone but inside ULEZ; our vehicles are compliant, so nothing is added for it.
Narrow lanes around the ponds with a conservation area; driveways elsewhere. Nearest station is Carshalton (Southern), and two cleaners for a flat, two to three for a house, working together in one visit rather than spreading the job across days.