We are asked about consumer unit upgrades on a post-war semi in Ystrad Mynach most weeks, usually after something has changed at the property. Materials and methods we spec on post-war semi work: metal-clad 18th Edition CU with RCBO per circuit; SPD retrofit; shower feed uprated to 10mm where the run length demands it. What we are really assessing is condition, not age. Wiring generation on record (rewired 1990s–2010s) so the quote matters; the date on the board does not, by itself. Around CF82 it is the single most common reason a job runs long.
Where an installation has been extended over decades, the sensible approach is to establish a baseline before adding anything else to it. For 1970s estates around Hengoed that detail matters more than it does elsewhere. If a previous certificate exists, consumer unit upgrades on a post-war semi usually starts by checking whether it still reflects reality.
