What this topic is
- The consumer unit, sometimes called the fuse board or fuse box, is the control point for the fixed electrical installation in a property. It distributes electricity to individual circuits and provides overload, short circuit and, on modern units, residual current (RCD) protection.
- Older installations may still use rewireable fuses, a single main switch or plastic-cased boards without RCD protection on final circuits. Newer installations under the 18th Edition of the IET Wiring Regulations use metal-cased consumer units with RCD or RCBO protection on most circuits.
- An upgrade replaces the consumer unit and, in some cases, brings associated tails, earthing and bonding up to current standards. Scope depends on the age and condition of the existing installation.
Why it matters to landlords, letting agents and homeowners
- An EICR (Electrical Installation Condition Report) may flag an older consumer unit with a C2 (potentially dangerous) or C3 (improvement recommended) code. C1 and C2 codes require remedial action within 28 days for privately rented homes in England.
- Since 2016 new domestic consumer units are required to have a non-combustible enclosure (usually metal). Plastic consumer units in older installations are not automatically dangerous but are often coded for improvement.
- Adequate RCD protection reduces the risk of electric shock and fire. A properly coordinated upgrade also makes future fault finding and testing quicker for the electrician.
- For landlords, a documented consumer unit upgrade strengthens the wider HHSRS evidence position on electrical hazards and supports the next EICR.
How it connects to property safety and compliance
- RCDs disconnect the supply quickly when they detect current leaking to earth, such as through a damaged cable or a person touching a live conductor.
- RCBOs combine overcurrent and RCD protection on a single circuit, which limits how much of the property loses power if a single circuit trips.
- Older wiring, damaged cables, DIY additions and shared bathroom or kitchen circuits are common reasons an electrician recommends both a consumer unit upgrade and further remedial work.
- Any consumer unit change should be tested and certified. Ask for the electrical installation certificate on completion and store it with the property records.
How Sunderland Landlord Compliance can help
- Coordinate EICR bookings through qualified electrical contractors and record C1, C2 and C3 findings against the property.
- Arrange a written quote for consumer unit upgrade work identified by the EICR, with scope and price confirmed before any work is booked.
- Keep the electrical installation certificate, EICR and any minor works certificates in one place against each property.
- Signpost to the next EICR renewal date once remedial work is complete.
Relevant SLC services and pages
Official sources
General awareness only
This page is published for general awareness and education. It is not legal advice and does not replace formal advice from a solicitor, surveyor or your local authority. Sunderland Landlord Compliance is a compliance coordination service and does not act as a legal adviser, local authority, enforcement body, surveyor, solicitor or housing inspector. SLC does not guarantee compliance.