Dorking is an old market town with a large conservation area and a high concentration of listed and period buildings. Victorian and Edwardian properties along West Street, South Street, and the roads running off the High Street frequently still have original or partially updated fuse boards — many pre-dating RCD protection entirely. The larger period houses around Deepdene and Pixham are often on their second or third board, with decades of added circuits sitting on protection that was never designed for the load. Post-war housing across North Holmwood, Goodwyns, and Chart Downs makes up much of the rest of the stock, and those boards increasingly fall short of current 18th Edition standards.

Rural properties present their own challenges. Homes in the Surrey Hills villages towards Coldharbour, Leith Hill, and Ranmore often combine older wiring with newer extensions or outbuildings, and many are fed by overhead supplies — which makes a Surge Protection Device under Amendment 2 particularly worthwhile given the exposure to lightning-induced voltage spikes. Newer developments are better specified, but most still need an SPD adding, and many now need extra capacity for EV chargers and home office circuits.