Free Consumer Unit Replacement Cost Calculator
Estimate the cost of replacing your fuse box or consumer unit. Compare RCD and RCBO options based on your number of circuits and location.
This consumer unit cost calculator helps homeowners estimate the cost of upgrading or replacing their fuse box (consumer unit). Enter your current setup, number of circuits, upgrade preference, and postcode to get a price estimate based on real local electrician rates. All consumer unit replacements are notifiable under Part P and require certification.
Consumer Unit Replacement Cost Calculator results
Fill in the details and select Calculate to see your figures.
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Tradehand is the software your trade business runs on, with an assistant that answers every call and message, sends your quotes the same day and chases them until they land. The first £10,000 Tradehand collects for a business carries no Tradehand fee. After that, Tradehand earns 5% of collected invoice payments. No monthly fee, setup fee, card fee or contract.
Get startedHow to use the Consumer Unit Replacement Cost Calculator
- 1Identify your current consumer unit type. Check if it has rewirable fuses, MCBs with an RCD, or a split-load setup.
- 2Count the number of circuits (fuses or MCBs) in your current unit.
- 3Choose whether you want a dual RCD board (cheaper, standard protection) or a full RCBO board (each circuit individually protected).
- 4Enter your postcode. We use real local electrician day rates to adjust the estimate for your area.
- 5The estimate includes Part P certification when done by a registered electrician.
How the Consumer Unit Replacement Cost Calculator works
A consumer unit replacement is a regional price estimate, not a fixed formula. It is essentially a base board-and-labour cost plus a small amount per extra circuit, adjusted for how much extra work the old setup needs and for local rates.
- Dual RCD board, national rates: base £400–£550.
- 10 circuits = 2 above the 8-circuit baseline, at ~£15 each = +£30.
- Replacing an old fuse box (likely earthing/bonding work) adds ~£120 → roughly £550–£700 before any local uplift.
- A full RCBO board costs more (base £600–£800, ~£35 per extra circuit) because each circuit gets its own protective device.
This is a cost breakdown, not an engineering formula. The figures are calibrated to real UK electrician pricing. A replacement is notifiable under Part P; the certificate is included when a registered electrician does the work, but faults found during testing (earthing, bonding, damaged cables) can add cost.
Typical UK benchmarks
| UK Average Consumer Unit Replacement (10-way RCBO) | £350-£800, averaging £485 for a standard 10-way RCBO board (Checkatrade Consumer Unit Replacement Cost guide, 2026) |
| Large Property / 12+ Circuits | Up to around £800 for a large detached property or 12+ circuits (Checkatrade Consumer Unit Replacement Cost guide, 2026) |
| Part P Certification | Included in the price when a registered electrician (NICEIC/NAPIT) self-certifies the work (Approved Document P; NICEIC) |
Disclaimer
This tool gives an estimate for general guidance only, based on typical UK figures and the details you enter. It is not a formal quote, survey, or professional advice. Always confirm with a qualified tradesperson before relying on any figure, as regional prices, site conditions, and current standards vary.
You do the job, Tradehand handles everything around it.
Your assistant sends the quotes, chases the invoices, books the work and keeps your customers updated. The first £10,000 Tradehand collects for a business carries no Tradehand fee. After that, Tradehand earns 5% of collected invoice payments. No monthly fee, setup fee, card fee or contract. One office hire costs about £25,000 a year, whether the invoices land or not.
Source: Office manager salary, National Careers Service
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