In Hounslow (TW3) the split is 43% flats to 57% houses over 18,207 households, and the stock is mainly Edwardian.
Because 40% of Hounslow is privately rented and 18% socially rented, a lot of TW3 work is agreed with a landlord or managing agent rather than the person opening the door.
Walls are some of it dry-lined during a later refurbishment — and solid London stock brick, with 18% social-rented stock locally, block access is agreed with the estate office first, so the fixing that matters in Hounslow is chosen on site — the usual failure here is fixings landing in soft lime mortar joints instead of the brick body, as the Hounslow stock goes, and with 40% of homes here privately rented, it sets the booking date as often as the job does.
Hounslow is outside the Congestion Charge zone but inside ULEZ; our vehicles are compliant, so nothing is added for it. What shapes the job more is the neighbourhood itself — a long pedestrianised high street, the heath and airport-adjacent housing — which is why a TW3 quote is not a Hounslow average.
Getting to the door matters as much as the job: pedestrianised high street with timed access; new blocks need booked lifts. Hounslow Central (Piccadilly) is the nearest station, and one cleaner for a flat; two for a house, so the property is finished in one visit rather than split across a day.