How much does a consumer unit upgrade cost?

There is no responsible flat-rate price for a consumer unit upgrade. The cost depends mainly on the condition of the installation, the number of circuits, the protection each circuit needs and whether the existing earthing and bonding meet current requirements. A lower initial price may not include remedial work found during testing.

The consumer unit itself is only one part of the cost. A complete quotation may include the board, circuit protection, surge protection where required, labour, testing and certification. It may also include changes to cables, earthing, bonding or the enclosure if the existing installation cannot safely support the new board.

We normally assess the following before we price the work:

• The condition of the wiring: older cables may have damaged insulation, loose connections or faults that only show during testing.
• The number of circuits: lighting, sockets, cooker, shower, heating, outbuildings and other circuits each need suitable protection and space within the board.
• The earthing and bonding: these provide an important route for fault current and may need upgrading before the consumer unit can be replaced.
• The board location: restricted access, a damp position or limited room around the existing unit can affect the work required.
• Existing and planned equipment: solar panels, battery storage, an electric vehicle charger or electric heating may affect the board design and available capacity.

Protection affects the price. Modern boards can use miniature circuit-breakers with residual current protection, or individual RCBOs for separate circuits. Individual protection can reduce the chance of one fault switching off several parts of the house, but it may cost more than a simpler arrangement. The correct design depends on the installation rather than on choosing the most expensive board.

Surge protection may also be appropriate. It helps protect electrical equipment from certain transient overvoltages, including those associated with events on the supply network or nearby lightning activity. We explain when it is required or recommended instead of adding it without considering the rest of the installation.

A consumer unit upgrade does not automatically mean rewiring the house. If the existing cables test safely and are suitable for continued use, we can often replace the board without disturbing every circuit. If testing finds poor insulation, inadequate connections or another fault, that circuit may need repair before it can be connected to the new unit. In some older properties, several circuits may require attention, which can change the price considerably.

Older rural homes, extensions and converted buildings can need extra investigation because wiring may have been altered over several decades. A house may contain different cable types, an older supply arrangement or outbuilding circuits that are not clearly identified. We trace and test the circuits so the quotation reflects the installation rather than an assumption based only on the age of the fuse box.

Some quotes cover replacement only. Check whether the price includes:

• inspection and testing before the work;
• the consumer unit and the stated protective devices;
• repairs to accessible cable ends and connections;
• earthing or bonding alterations;
• labelling and circuit identification;
• testing after installation;
• an Electrical Installation Certificate and the required building regulations notification.

Decorating, plaster repairs, concealed cable replacement and work on inaccessible wiring may sit outside a basic replacement quotation. We identify those possibilities before work starts wherever the inspection allows, rather than treating them as unexpected additions.

Our NICEIC-registered electricians test the installation before connecting the new board and again when the work is complete. That testing confirms whether each circuit is safe to energise and records the results for the property owner. ECA membership also reflects the electrical standards and professional processes behind the work.

The sensible way to compare consumer unit upgrade costs is to compare what each quotation includes, not just the price on the first line. A quotation that allows for testing, suitable protection, remedial work and certification gives a more useful picture of the final cost than a board-only figure.

If the fuse box still works but has not been tested for years, an electrical inspection may be the right first step. It can show whether replacement is necessary now, whether repairs are more appropriate or whether the installation needs wider improvement.