In Clerkenwell (EC1) the split is 94% flats to 6% houses over 5,170 households, and the stock is Georgian and early Victorian.
Because 36% of Clerkenwell is privately rented and 39% socially rented, a lot of EC1 work is agreed with a landlord or managing agent rather than the person opening the door.
Walls are precast concrete panels and dense blockwork; locally that also means often with surface conduit, which is why City of London Corporation kerb rules get settled before the van is loaded, so the fixing that matters in Clerkenwell is chosen on site — the usual failure here is Clerkenwell gives us drilling blind into a panel with reinforcement or a buried cable behind it, where 25% owner-occupation means the same home is booked again rather than a new tenant each year.
Clerkenwell 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 — design studios, Italian delis and Georgian squares on the City's north-west edge — which is why a EC1 quote is not a City of London average.
On access, narrow one-way streets, seven-day controlled bays and warehouse lofts up several flights of stairs — 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 Farringdon (Elizabeth line, Circle, Thameslink).