The W1 stock around Berkeley Square is mixed-era. ONS records 88% flats, 12% houses and 3,555 households in Mayfair.
Owner-occupation runs at 32% in Mayfair, so alongside the 57% rental churn there is steady planned work — refurbishments, downsizes and probate clearances booked weeks ahead.
Mayfair substrates run to with metal stud partitions between rooms, over dot-and-dab plasterboard over blockwork — the reality on the streets around Berkeley Square. Nothing is drilled until the wall has been sounded, because in W1, short screws that grip only the board and slowly lever it off the dabs — which is why Westminster City Council kerb rules get settled before the van is loaded is the mistake that costs a W1 customer twice.
Two streets can behave very differently in Mayfair: grosvenor and Berkeley squares, private members' clubs and the flagship stores of Bond Street. The quote reflects the street the job is actually on. Mayfair sits inside the Congestion Charge zone as well as ULEZ, so both are itemised on the quote rather than absorbed into an hourly rate.
Extremely tight kerbside, mews arches under 2.1m and listed interiors needing floor and stair protection. Nearest station is Bond Street (Central, Jubilee, Elizabeth line), 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.