How much does a new consumer unit (fuse box) cost?
A consumer unit replacement is a fixed-price job including testing and certification. Get an indicative figure below.
What a consumer unit swap involves
- 1Assessment and testing
The electrician checks existing circuits — pre-existing faults may need fixing before the new board goes in.
- 2Install and protection
A modern board with RCBO protection per circuit (and often surge protection) to current regulations.
- 3Certification
Testing, an Electrical Installation Certificate and building control notification complete the job.
An outdated consumer unit is a common EICR flag. Swapping to a modern RCBO board is a relatively cheap way to clear a report and improve safety — budget it alongside the EICR on any tenanted purchase.
Consumer unit costs (indicative, fitted)
| Scope | Description | Indicative cost |
|---|---|---|
| Standard swap | Like-for-like, RCBOs | £450 – £700 |
| With remedial work | If faults found | £600 – £1,100 |
| SPD / upgrades | Surge protection etc. | add £60 – £150 |
| Certificate included | EIC + notification | yes |
Modern boards use RCBOs per circuit. Faults found on testing may need fixing first.
Frequently asked questions
How much does a new fuse box cost?+
A consumer unit replacement typically costs £450–£800 supply and fit, including testing and certification. If testing reveals faults that must be fixed first, the total is higher.
Does a new consumer unit need a certificate?+
Yes — the work should come with an Electrical Installation Certificate and building control notification. Keep it with your EICR and other compliance documents.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.