01
Condition
Is anything damaged, loose or overheating?
Physical damage, signs of heat or unsafe access need direct assessment. Cosmetic age alone is a different issue.
Does My Fuse Box
Need Replacing?
An older board is not condemned by colour or age alone. Replacement becomes justified when the existing equipment, protection, condition or planned work cannot provide a suitable completed installation.
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Assess the installation, not the photograph alone
The short answer, before the detail
Replacement may be appropriate where the enclosure or devices are damaged, essential protective measures are absent, the equipment is unsuitable for planned alterations or a safer maintainable arrangement cannot be achieved. Existing circuits still need testing before they are transferred to a new consumer unit.
- Do not promise a board swap before testing circuits.
- Check supply, earthing and bonding at the survey.
- Separate recommendations from defects requiring action.
- Choose devices around the verified circuit design.
Start with the property, not the product
Four questions decide more than the board’s age
The consumer unit is the origin of the installation, but it cannot correct every defect downstream.
Swipe through the four questions
02
Protection
What protection do the circuits currently have?
RCD type, circuit grouping, protective devices and surge-protection decisions must be considered against the installation and intended work.
03
Circuits
Will the existing wiring pass the required tests?
A new board can reveal insulation, continuity or borrowed-neutral faults when circuits are individually protected and tested.
04
Alterations
What new work must the board support?
New circuits or major alterations may change capacity, ways, isolation and protective-device requirements.
A practical decision guide
Replace for a defined reason, not a sales script
A recommendation should connect the present condition and planned work to the proposed design.
Urgent assessment
Damage, exposed parts or overheating
The immediate concern is making the installation safe. The final repair or replacement follows inspection of the affected equipment and circuits.
Planned replacement
Protection or capacity no longer suits the installation
A designed upgrade can provide an appropriate arrangement for verified circuits and planned work, with testing and documentation included.
May remain
Older equipment that remains safe and serviceable
Age or a plastic enclosure does not automatically mean immediate replacement. An inspection can distinguish improvement recommendations from defects.
Wider work
Circuit defects need more than a new board
Broken rings, poor insulation, missing conductors or unsuitable alterations require circuit-level remedial work as well as any consumer-unit decision.
What professional work looks like
A responsible replacement starts before isolation
The survey and pre-work checks reduce surprises and define the quotation.
- 01
Inspect supply, earthing and bonding
Confirm the incoming arrangement, service equipment, main earthing and protective bonding relevant to the work.
- 02
Identify circuits and likely defects
Review schedules, circuit count, existing protection and visible signs of alteration or damage.
- 03
Test before transfer
Check circuit condition so faults can be explained and priced rather than hidden behind the new enclosure.
- 04
Design and install the board
Select the enclosure, ways, isolation and protective devices from the verified installation.
- 05
Test, label and certify
Complete the applicable inspection, schedules, Electrical Installation Certificate and Building Regulations notification.
Experience made visible
The new enclosure is only part of the handover
The customer should receive a clear circuit schedule, test results and the applicable certification—not simply a photograph of a tidy board.
- Pre-existing faults explained before transfer.
- Circuit labels match the actual property.
- Test results and certificate supplied.
- Building Regulations record provided where applicable.
Sources and scope
This guide explains the practical issues customers ask about. Regulations and official guidance can change, and the correct solution still depends on the property. The following primary sources were checked when this page was prepared:
Consumer Unit Replacement Questions
Straight answers to the questions customers ask before arranging a survey or inspection.
Does a plastic fuse box have to be replaced?
Not solely because it is plastic. Condition, location, protection and the wider installation determine whether replacement is required or recommended. A competent inspection should distinguish those conclusions.
Will a new consumer unit stop circuits tripping?
Not if an underlying circuit or appliance fault remains. Testing should identify existing defects; a new protective device may reveal faults that older arrangements did not detect in the same way.
Can a consumer unit be replaced without an EICR?
A consumer-unit replacement includes inspection and testing relevant to the work and an Electrical Installation Certificate. Where the wider installation condition is uncertain, a separate EICR may also be recommended, but the documents serve different purposes.
Does consumer unit replacement include Building Regulations notification?
Consumer-unit replacement in a dwelling is notifiable work in England. The installer should explain the certification and notification route included in the quotation.
Arrange a Consumer Unit Survey
Send the property details and, if useful, a photograph of the existing board after submitting. We test the existing installation before confirming the design.
Survey First
We inspect the property and existing installation before specifying work.
Evidence-Led Scope
The quotation separates verified work from assumptions and optional improvements.
Tested Handover
The completed work is tested and documented for its actual scope.
Clear Next Step
You know what is included, what remains and who controls the finished system.