The housing stock
What we are usually working with in Roxbourne
The carry is the constraint: a single stair with tight half-landings, or deck access with a long walk from the lift. A run that has to be scribed twice takes an hour longer than one that does not, and the day is costed with that hour in it. The awkward piece goes in before the easy ones.
Uniform stock means a template from one house nearly fits the next, but never assume it, because 1930s builders varied the back-door corner by an inch or two.
The hot water cylinder sits in a cupboard opening off the kitchen or the landing above it, and the pipework to it drops through the corner of the room. Carcass heights are corrected on the day where legs have bottomed out, because a top will not bridge a step between units. The units are shimmed to one datum before stone touches them.
Around here the stock is 1930s estate semi, interwar terrace and 1960s maisonette block. They fail in different places, which is why the survey looks at different things.
Access. Uniform estate roads with drives on many houses and consistent side gate widths, which makes access predictable; maisonette blocks need a shared external stair and a two-person lift up.
There is nothing to visit in Roxbourne. Samples are posted free, the template is taken in your kitchen and the stone is fitted there too.