How much does a fuse board upgrade cost?
How much does a consumer unit upgrade cost?
A consumer unit (fuse board) replacement costs £300–£600 in the UK (2026 prices), including an 18th edition metal consumer unit, all associated components, labour, and Part P building regulations notification.
| Job | Typical cost (2026) |
|---|---|
| Consumer unit replacement (standard 10–16 way) | £300–£500 |
| Consumer unit replacement with RCBO protection per circuit | £450–£700 |
| Consumer unit replacement + meter tails upgrade | £500–£800 |
| Consumer unit replacement combined with EV charger installation | £900–£1,400 total |
Prices in London and the south-east of England are typically 15–25% higher than the national average. A larger consumer unit with more circuits or RCBO (rather than RCD) protection for each circuit will also push costs toward the top of the range.
When is a consumer unit upgrade needed?
Most modern homes (built since the 1990s) have a consumer unit with MCBs (miniature circuit breakers) and RCD protection. These do not need replacing solely to add an EV charger — as long as there is a spare way to fit a 32A MCB for the charger circuit.
An upgrade is typically needed when:
- Rewireable fuse board: older homes with ceramic fuses rather than MCBs. These do not meet 18th edition wiring regulations for new circuits and must be replaced before an EV charger can be added.
- No spare capacity: a consumer unit with every way occupied and no space to add a 32A MCB. This is more common in older semi-detached and terraced houses.
- No RCD protection: some older MCB boards lack RCD protection. Current regulations require RCD or RCBO protection on all new circuits, including EV charger circuits.
- Plastic consumer unit: since 2016, UK regulations require consumer units in domestic properties to be in non-combustible (metal) enclosures. A legacy plastic board must be replaced.
Consumer unit upgrades and EV charger installations
An EV charger requires a dedicated 32A circuit from the consumer unit to the charger location. This circuit needs:
- A free 32A MCB slot in the consumer unit
- RCD or RCBO protection on the circuit
- Correctly sized cable (typically 6mm² twin and earth for a 7.4kW single-phase charger)
If your consumer unit already has a spare 32A way with RCD protection, no upgrade is needed: the installer simply adds the MCB and runs the cable. If not, the consumer unit must be upgraded first.
Combining the consumer unit upgrade and the EV charger installation in a single visit is almost always the most cost-effective approach. The electricity supply is turned off once, the Part P notification covers both elements, and there is only one mobilisation cost.
What is involved in a consumer unit upgrade?
A consumer unit replacement is a job for a registered electrician. It is not DIY work. The process:
- The electrician isolates the electricity supply at the meter (requires the network operator if the meter tails are old or need replacement).
- The old consumer unit is removed and all circuit cables are disconnected.
- A new metal 18th edition consumer unit is fitted in the same location.
- All existing circuits are reconnected and each is tested to confirm it is safe and correctly rated.
- The electrician issues an Electrical Installation Certificate (EIC) and notifies Part P building control — this is the building regulations sign-off.
The whole job takes approximately 3–5 hours for a standard residential consumer unit. During this time, the home has no electricity. Plan around this, particularly in winter.
What affects the price?
| Factor | Effect on price |
|---|---|
| Number of circuits (ways in the new CU) | More ways = slightly higher unit cost, negligible difference |
| RCBO vs RCD protection | RCBO per circuit adds £15–£30 per circuit but gives more granular protection |
| Meter tails replacement | Adds £80–£150 if the existing tails are old, undersized, or need extending |
| DNO attendance (old meter) | If the network operator needs to attend, adds delay and potentially a small fee |
| Location and access | Difficult locations (blocked meter cupboard, cramped utility room) add time and labour cost |
| Region | London and south-east 15–25% higher than national average |
| Combined with EV charger | One visit, one mobilisation cost: usually more cost-effective than separate jobs |
The cheapest valid route is a standard metal consumer unit with two RCDs (split-load), which meets regulations and is the most common configuration in new UK builds. RCBO-per-circuit boards cost more upfront but mean that a tripped circuit takes out only one room rather than half the house.
For a full picture of what an EV charger installation costs in total (including the consumer unit upgrade where needed), see our home EV charger cost guide.
Common questions
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Graham Dodd
Director · Drives a Volkswagen ID. Buzz
Graham co-founded Power EV and EV Charge Cable with the aim of removing the guesswork from home EV charging. Getting a charger fitted and choosing the right cable are closely linked decisions, and running both sites lets the team give joined-up advice on both.
Meet the team