There's no pretending rewiring a house isn't a big job. It involves pulling out all the old electrical wires and replacing them with newer, safer ones. If you're lucky, a sparky can access the wiring from outside the house or without needing to damage existing walls. Sometimes, they might have to do some damage - by removing the cladding or drilling through timber - that will be fixed up and cost out as part of the project. A home rewiring might involve replacing the wires. It will likely include additional upgrades: new sockets, power points, switches, or a new switchboard.