Typical costs
A new lighting circuit means running a new cable from the consumer unit to a set of light positions and switches. It's common in extensions, loft conversions and garage conversions.
| Job | Typical cost |
|---|---|
| New lighting circuit, simple run | £400 – £700 |
| New lighting circuit with several switches | £600 – £900 |
| New circuit plus downlights (6) | £800 – £1,500 |
| Adding a breaker to the consumer unit | £80 – £200 |
| Consumer unit upgrade (if no space) | £500 – £1,000 |
Indicative costs for a new lighting circuit (2026)
When do you need a new circuit?
Smaller additions – a couple of extra lights – can usually be connected to an existing circuit.
- Extensions and loft conversions
- A large number of new lights
- Existing circuit is overloaded or old
- Splitting lighting across floors for safety
Consumer unit space
A new circuit needs a spare way in the consumer unit. If there isn't one, or the unit is old, it may need upgrading. See consumer unit upgrades explained.
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Certificates
A new circuit is notifiable under Part P in England and Wales. Your electrician should be registered with a competent person scheme, issue an Electrical Installation Certificate and notify building control. See electrical certificates explained.
Getting quotes
Ask what's included: cable, switches, light fittings, consumer unit work, certification and making good. Get quotes from local electricians, and see how much it costs to install LED downlights.
