The Low Voltage Electrotechnical Regulation (REBT), in its ITC-BT-25, requires a home's installation to be split into several independent circuits according to the level of electrification. It isn't an option for the installer: it's a regulatory minimum that must be quoted from the start.
Basic electrification: 5 circuits minimum
A home with basic electrification needs at least 5 circuits: general lighting, general-purpose sockets, kitchen and oven, washing machine–dishwasher–water heater, and bathroom and kitchen sockets. It is the legal minimum, no longer common in new builds.
High electrification: up to 10 circuits or more
Most renovations and new homes are carried out with high electrification, which adds independent circuits for: additional lighting, air conditioning, electric heating, tumble dryer, automation (home automation) and provision for EV charging. In a 90–120 m² home it is usual to end up with 10 to 14 circuits in the unit.
Why it matters when quoting
Each extra circuit means more cable, more circuit breakers, more space in the unit (and sometimes a double-row unit instead of a single) and more labour hours for the cabling. Miscounting the number of circuits needed is one of the most frequent reasons electrical quotes fall short halfway through a job.
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