Walk Holborn from Lincoln's Inn Fields outwards and the post-war pattern is obvious: 95% of the 3,090 households in WC1 live in flats, 5% in houses.
Private renting sits at 30% and owner-occupation at 18%; the first group books pathway jet washing at short notice, the second plans it.
Holborn substrates run to precast concrete panels and dense blockwork; locally that also means often with surface conduit — where 18% owner-occupation means the same home is booked again rather than a new tenant each year. Nothing is drilled until the wall has been sounded, because in WC1, drilling blind into a panel with reinforcement or a buried cable behind it — the pattern behind 3,090 households inside the WC1 neighbourhood is the mistake that costs a WC1 customer twice.
Two streets can behave very differently in Holborn: legal London — the Inns of Court, Lincoln's Inn Fields and Sicilian Avenue. The quote reflects the street the job is actually on. Holborn 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: inns of Court gate access, weekday loading windows and listed staircases. Holborn (Central, Piccadilly) is the nearest station, and one technician for a private path; two where a communal walkway has to stay open to residents while the work is done, so one can manage access while the other washes.