In Clerkenwell (EC1) the split is 94% flats to 6% houses over 5,170 households, and the stock is Georgian and early Victorian.
The renter-heavy mix here (25% owned, 36% privately rented) means a EC1 diary swings between short-notice tenancy deadlines and appointments set a fortnight out.
Expect precast concrete panels and dense blockwork in EC1, often with surface conduit, which is why City of London Corporation kerb rules get settled before the van is loaded behind the plaster in EC1. That is why fixings are picked in the room rather than off a van shelf, and why Clerkenwell gives us drilling blind into a panel with reinforcement or a buried cable behind it, a median age of 31 in this neighbourhood shapes what gets ordered here is the fault we are called back to undo.
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.
Narrow one-way streets, seven-day controlled bays and warehouse lofts up several flights of stairs. Nearest station is Farringdon (Elizabeth line, Circle, Thameslink), and one technician with a portable extraction machine and air mover on a single household booking; two technicians on HMO, student accommodation and serviced-apartment rounds where six or more mattresses are cleaned in a day.