Typical costs
Prices depend on whether existing wiring can be reused and where the transformer can be installed.
| Job | Typical cost |
|---|---|
| Replace existing wired doorbell | £80 – £150 |
| New doorbell transformer | £80 – £180 |
| New wired doorbell with transformer | £150 – £250 |
| Hardwired video doorbell | £120 – £250 (labour) |
Indicative doorbell installation costs (2026)
What does a transformer do?
A doorbell transformer reduces mains voltage to a low voltage (often 8–24V). Video doorbells often need a specific voltage and power, so an old transformer may need replacing.
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Battery vs hardwired
Hardwiring is more reliable but needs a suitable supply.
- Battery – easy to fit, needs recharging
- Hardwired – constant power, no recharging
Rules
Installing a transformer connected to mains is electrical work and should be done by a competent electrician. Get quotes from local electricians.
