Converted buildings hide several generations of work
A large house divided into flats may contain original masonry and timber, later partitions, boxed services and repairs of unknown age. The newest paint layer offers little evidence about what will support a fixing. Before mounting, drilling or removing a built-in item, explain what is known about the conversion and show nearby services. On site, the method should follow the actual construction. Old plaster may need local stabilisation, while a lightweight partition may require a revised position or additional support. This inspection-first approach is slower than guessing for a few minutes and far quicker than repairing avoidable damage afterwards.

