Inter-war houses and what they need
The bay-fronted semis and terraces around Raynes Park almost all have solid or early cavity walls with sand and cement backing coats under a finish that has been decorated many times. Where that backing is still well keyed, a skim over the top is the efficient answer. Where it sounds hollow, patching over it just moves the problem along the wall.
Bay windows are the recurring detail here. Replacement windows leave reveals and heads that need building out and squaring up, and the plastering is what makes the new window look like it was always there.
