Electrical installation work
Installation covers anything that adds to an electrical system rather than repairing it: a single socket, a lighting circuit, a consumer unit, a machine supply, or a complete rewire. The scale varies enormously; the method does not. Every installation starts by establishing what the existing system can carry.
New circuits and additions
Adding a circuit means deciding whether the board has a spare way, whether the incoming supply can take the load, and how the cable will be routed and protected. Extending an existing circuit is sometimes right and sometimes exactly wrong — a ring final circuit with too much on it is a fault waiting to happen.
Consumer unit replacement
The consumer unit is where protection lives. Older boards with rewireable fuses protect cables, not people. A modern unit with RCBOs protects each circuit individually, so one fault does not take out the whole house. Replacement also means testing every existing circuit, because the new board has to be signed off against what is connected to it.
Rewires
A full rewire is disruptive and worth planning around other work. Signs an installation is reaching end of life include rubber or fabric-sheathed cable, rewireable fuses, sockets that are scarce or damaged, and no earthing to lighting circuits.
Lighting
Lighting installation ranges from replacing a fitting to designing a scheme. Getting it right is about layers — ambient, task and accent — rather than one bright source in the middle of a ceiling.
Outdoor and special locations
Bathrooms, kitchens, gardens and outbuildings each have their own rules on equipment, protection and cable type. Those rules exist because water and electricity are a well-understood way to be killed.