Crowborough grew from the merging of several villages and hamlets over the course of the 19th and 20th centuries, which gives the town's housing a particularly wide age range. Victorian and Edwardian properties around the town centre and along the main roads frequently still have original or partially updated fuse boards — many pre-dating the introduction of RCD protection entirely. Post-war properties built through the 1950s, 60s, and 70s make up a significant part of the housing stock across areas like Jarvis Brook and the older residential streets, and these boards are increasingly falling short of current 18th Edition standards.

Rural properties in and around Crowborough present their own specific challenges. Homes on the edge of the Ashdown Forest and in the surrounding villages often have older wiring combined with newer extensions or outbuildings — a combination that benefits significantly from a full board assessment. Newer developments such as the Warren and the Nightingales are generally better specified, but even recently built consumer units often need a Surge Protection Device added under Amendment 2 — particularly important in a rural location where the supply is more susceptible to lightning-induced voltage spikes.