Walk Belgravia from Eaton Square outwards and the post-war pattern is obvious: 92% of the 3,844 households in SW1 live in flats, 8% in houses.
Private renting sits at 30% and owner-occupation at 22%; the first group books carpet fitting at short notice, the second plans it.
Belgravia substrates run to often with surface conduit, over precast concrete panels and dense blockwork — which is what a 92% flat share across the ONS neighbourhood covering Belgravia actually produces. Nothing is drilled until the wall has been sounded, because drilling blind into a panel with reinforcement or a buried cable behind it on these streets — which is why Westminster City Council kerb rules get settled before the van is loaded is the mistake that costs a SW1 customer twice.
Two streets can behave very differently in Belgravia: grosvenor estate stucco, embassies and cobbled mews behind Eaton Square. The quote reflects the street the job is actually on. Belgravia sits inside the Congestion Charge zone as well as ULEZ, so both are itemised on the quote rather than absorbed into an hourly rate.
On access, estate parking rules, mews arches with height limits and listed staircases requiring protection — one reason one fitter for a room or a straight flight; two for large open-plan floors, winder staircases and anything carried up above the third floor without a lift. Fitters travelling in use Sloane Square (Circle, District).