In Old Street (EC1V) the split is 98% flats to 2% houses over 4,949 households, and the stock is post-war.
With 28% private renting against 19% owner-occupied, most EC1V bookings land on a move-in day rather than a weekend.
Walls are often with surface conduit — and precast concrete panels and dense blockwork, which is what a 98% flat share across the ONS neighbourhood covering Old Street actually produces, so the fixing that matters in Old Street is chosen on site — the usual failure here is Old Street gives us drilling blind into a panel with reinforcement or a buried cable behind it, where 19% owner-occupation means the same home is booked again rather than a new tenant each year.
Old Street 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 — the roundabout, tech offices and warehouse conversions on the City fringe — which is why a EC1V quote is not a Islington average.
On access, red-route roundabout with no kerbside loading, goods-lift booking in the towers and gated estate yards — one reason one technician and a van-mounted dip tank; two for commercial ranges or where a lift booking limits the time on site. Fitters travelling in use Old Street (Northern, Great Northern).