In Mayfair (W1) the split is 88% flats to 12% houses over 3,555 households, and the stock is mixed-era.
Because 57% of Mayfair is privately rented and 11% socially rented, a lot of W1 work is agreed with a landlord or managing agent rather than the person opening the door.
Walls are with metal stud partitions between rooms — and dot-and-dab plasterboard over blockwork, measured on the walk in from Bond Street (Central, Jubilee, Elizabeth line) rather than assumed from a map, so the fixing that matters in Mayfair is chosen on site — the usual failure here is short screws that grip only the board and slowly lever it off the dabs, as the Mayfair stock goes, the reality on the streets around Berkeley Square.
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. What shapes the job more is the neighbourhood itself — grosvenor and Berkeley squares, private members' clubs and the flagship stores of Bond Street — which is why a W1 quote is not a Westminster average.
Getting to the door matters as much as the job: extremely tight kerbside, mews arches under 2.1m and listed interiors needing floor and stair protection. Bond Street (Central, Jubilee, Elizabeth line) is the nearest station, and one or two crew depending on access; American-style and full-height units on an upper floor with no lift are booked as a two-person job as standard.