The WC1 stock around Lincoln's Inn Fields is post-war. ONS records 95% flats, 5% houses and 3,090 households in Holborn.
30% of households rent privately and 18% own, which is why mirror and artwork hanging demand here peaks around tenancy changeovers and completion dates.
Expect precast concrete panels and dense blockwork in Holborn, often with surface conduit — and with 30% of homes here privately rented, it sets the booking date as often as the job does behind the plaster in WC1. That is why fixings are picked in the room rather than off a van shelf, and why in WC1, drilling blind into a panel with reinforcement or a buried cable behind it — measured on the walk in from Holborn (Central, Piccadilly) rather than assumed from a map is the fault we are called back to undo.
Two streets can behave very differently in Holborn: legal London — the Inns of Court, Lincoln's Inn Fields and Sicilian Avenue. The quote reflects the street the job is actually on. Holborn sits inside the Congestion Charge zone as well as ULEZ, so both are itemised on the quote rather than absorbed into an hourly rate.
Inns of Court gate access, weekday loading windows and listed staircases. Nearest station is Holborn (Central, Piccadilly), and one fitter for pictures and mirrors up to about 25kg; two for overmantels, full-length glass and anything carried up a communal stairwell.