How houses are wired

Number of Sockets
Minimum and desirable numbers of sockets recommended per room are given. Recommended numbers are inevitably a matter of opinion, and are only recommended as a starting point for consideration.

Bedroom
Minimum: 1 double socket at each of 2 locations
Recommended: 2x double sockets at each of 4 locations (in or near corners) + a double socket at side of single bed, or a double socket at each side of double bed. 2 way lighting switches controllable at door & bedside.
Corridor
Minimum: none
Recommended: 1 double socket for a short corridor, 2 or possibly more in a long one. Put one where a hall table might go.
Kitchen
Minimum:
Recommended: Under worktop: 4 or 5 double sockets. Over worktop: 1 double socket per 2 metres. All sockets on ring circuit, no spurs. 2A or 5A sockets on lighting circuit: one above each set of cupboards, one below each set of cupboards, one away from cupboards & worktop.
Lounge:
Minimum: 1 double socket at each of 2 locations
Recommended: 2x double sockets at each of 4 locations (in or near corners) + 1-3 double sockets where PC or AV equipment is to be used. If the room has 2 or more doors, 2 way lighting switches controllable at each door. 4-6x 2A or 5A sockets on lighting circuit.
Utility room:
Minimum: 1 double socket
Recommended: 2 or 3 double sockets, all on ring circuit
Bathroom:
Minimum: no sockets
Recommended: none. 1 socket somewhere out of easy reach in zone 3 if you wish to use an appliance in the bathroom (eg washing machine or dehumidifier). A shaver socket at the sink is an option, but plugging items in outside the room is probably better practice.
Home Office:
Minimum: a double socket at 2 locations
Recommended: 2x double sockets at each of 4 locations (generally near corners), plus anything from 2 to 6 double sockets where computer or other business appliances will go.
Small shed:
Minimum: no electricity supply
Recommended: if far from the house, a double socket can be useful. If you’ll spend time in it, a light too.
Large shed:
Minimum: no electricity supply
Recommended: plenty of lighting & sockets according to size & proposed use. Given the tendency for electricity use to rise over the years, an overrated feed cable may prove useful in time.
Greenhouse:
Minimum: no electricity supply
Recommended: A splashproof double socket above head height can be handy. For a dedicated horticulturalist, fluorescent lighting, a couple of splashproof double sockets positioned at head height or above, and a 13A socket for discharge lighting can all come in useful.
Lighting
Lampshade 5499-2.jpg
Radial circuits are used for lighting. There is one lighting circuit on each lighting MCB. Lighting circuits are usually on a 6A MCB or 5A fuse, though 10A can be used (with some extra restrictions (now removed in the 17th edition of the wiring regs)) for large circuits. However if the area served is large, more 5A or 6A circuits would in most cases be preferable.

lighting circuits are typically wired in 1mm² or 1.5mm² T&E cable (1.5mm² allows a longer cable run, before suffering too much voltage drop).

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