In Hampstead (NW3) the split is 84% flats to 17% houses over 11,433 households, and the stock is Georgian and early Victorian.
Because 45% of Hampstead is privately rented and 17% socially rented, a lot of NW3 work is agreed with a landlord or managing agent rather than the person opening the door.
Hampstead substrates run to with solid brick on the party and external walls, over lath and plaster over timber studs, where 39% 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 a plasterboard plug spun into lime plaster; locally that also means which crumbles the key and drops the panel, the reality on the streets around Hampstead Heath and Kenwood House is the mistake that costs a NW3 customer twice.
Hampstead 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 — georgian hill village of narrow lanes, artists' houses and the Heath on its doorstep — which is why a NW3 quote is not a Camden average.
Getting to the door matters as much as the job: steep, narrow lanes where a 3.5t Luton is the practical maximum; several streets need a shuttle from Whitestone Pond. Hampstead (Northern) is the nearest station, and two crew and a Luton on a small office or shop unit; three to four crew with a 7.5-tonne vehicle on retail strip-outs, warehouses and racking removals.