The SE1 stock around The National Theatre and Tate Modern is post-war. ONS records 94% flats, 6% houses and 4,696 households in South Bank and Waterloo.
Owner-occupation runs at 24% in South Bank and Waterloo, so alongside the 44% rental churn there is steady planned work — refurbishments, downsizes and probate clearances booked weeks ahead.
South Bank and Waterloo substrates run to precast concrete panels and dense blockwork; locally that also means often with surface conduit — measured on the walk in from Waterloo (Jubilee, Northern, Bakerloo, National Rail) rather than assumed from a map. Nothing is drilled until the wall has been sounded, because in SE1, drilling blind into a panel with reinforcement or a buried cable behind it — which is why London Borough of Southwark kerb rules get settled before the van is loaded is the mistake that costs a SE1 customer twice.
Two streets can behave very differently in South Bank and Waterloo: cultural riverfront from the National Theatre to Tate Modern, with Waterloo's flats behind. The quote reflects the street the job is actually on. South Bank and Waterloo sits inside the Congestion Charge zone as well as ULEZ, so both are itemised on the quote rather than absorbed into an hourly rate.
Getting to the door matters as much as the job: riverside pedestrian zones, red routes on Stamford Street and event-day closures. Waterloo (Jubilee, Northern, Bakerloo, National Rail) is the nearest station, and one technician with a portable extraction machine — the standard kit for London flats, where a truck-mount hose cannot reach a fourth floor.