The HA1 stock around Harrow School and St Mary's Church is mainly Victorian. ONS records 38% flats, 62% houses and 14,108 households in Harrow.
Owner-occupation runs at 59% in Harrow, so alongside the 31% rental churn there is steady planned work — refurbishments, downsizes and probate clearances booked weeks ahead.
Expect some of it dry-lined during a later refurbishment — and solid London stock brick — which is what a 38% flat share across the ONS neighbourhood covering Harrow actually produces behind the plaster in HA1. That is why fixings are picked in the room rather than off a van shelf, and why in HA1, fixings landing in soft lime mortar joints instead of the brick body — which is why London Borough of Harrow kerb rules get settled before the van is loaded is the fault we are called back to undo.
Two streets can behave very differently in Harrow: town centre shopping, St Ann's mall and the school on the hill above. The quote reflects the street the job is actually on. Harrow is outside the Congestion Charge zone but inside ULEZ; our vehicles are compliant, so nothing is added for it.
Getting to the door matters as much as the job: one-way town centre with timed loading; the hill lanes are narrow and steep. Harrow-on-the-Hill (Metropolitan, Chiltern) is the nearest station, and one fitter for pictures and mirrors up to about 25kg; two for overmantels, full-length glass and anything carried up a communal stairwell.