The housing stock
What we are usually working with in Hornchurch
These were built with a coal store and an outside lavatory off the back, and where those got absorbed into the kitchen the walls around them are thinner and later. Carcasses that carried laminate for two decades are worth checking, and often bracing, before they carry stone. The wall behind the old top is rarely the wall on the drawing.
Residential roads are easy with dropped kerbs and side gates, but the High Street and Station Lane flats have loading restrictions, timed bays and first-floor stair access with a tight turn. Half the borough's semis have the sink stuck under a low rear window, so we check the sill height before specifying an upstand, often there is not enough room for one.
Where the dividing wall has come out there is a steel over the opening and a nib of the old wall left at each end, and a run turning that corner has to clear both nibs. The cill over the sink is checked against the new upstand height before anything is cut. The old top hid it; the new one will not.
What we are measuring in, mostly, is 1930s semi, inter-war terrace, post-war semi and town-centre flat. That mix is why two jobs on the same road can run completely differently.
There is nothing to visit in Hornchurch. Samples are posted free, the template is taken in your kitchen and the stone is fitted there too.