In Hampstead (NW3) the split is 84% flats to 17% houses over 11,433 households, and the stock is Georgian and early Victorian.
The renter-heavy mix here (39% owned, 45% privately rented) means a NW3 diary swings between short-notice tenancy deadlines and appointments set a fortnight out.
Walls are lath and plaster over timber studs; locally that also means with solid brick on the party and external walls, which is why London Borough of Camden kerb rules get settled before the van is loaded, so the fixing that matters in Hampstead is chosen on site — the usual failure here is a plasterboard plug spun into lime plaster in Hampstead, which crumbles the key and drops the panel, where 39% owner-occupation means the same home is booked again rather than a new tenant each year.
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.
On access, steep, narrow lanes where a 3.5t Luton is the practical maximum; several streets need a shuttle from Whitestone Pond — one reason one cleaner for a flat; two for a house, so the property is finished in one visit rather than split across a day. Fitters travelling in use Hampstead (Northern).