Signs your consumer unit needs replacing
- You still have an old fuse box with rewireable fuses (fuse wire) and no RCD protection
- The unit has a plastic enclosure that was installed before metal enclosures became the standard for domestic units
- Scorch marks, a burning smell, buzzing or heat from the unit
- A cracked or damaged enclosure, or missing blanks and covers
- Protective devices that trip without reason or won't reset
- An inspection report has recommended replacement
- You're adding circuits, for example a new kitchen, shower or EV charger, and there's no space or suitable protection
What a consumer unit replacement involves
- Survey and quotation: we check the existing installation, earthing and bonding, and give you a written price.
- Pre-installation testing: we test the existing circuits before changing the board, because a new unit with RCD protection can reveal faults that old fuses tolerated.
- Installation: a new consumer unit with RCD or RCBO protection and surge protection where required, installed to BS 7671.
- Testing and certification: every circuit is tested, and you receive an Electrical Installation Certificate.
- Building regulations: the work is notified under Part P through NAPIT and you receive a Building Regulations compliance certificate.
Most domestic replacements are completed in a day. The power will be off for part of that time, and we'll agree timings with you in advance.
What if faults are found?
If pre-installation testing finds a faulty circuit, we'll explain it before going further. Some faults can be repaired on the day. Others may need a quotation for extra work. We won't simply leave a circuit disconnected without discussing it with you first.
RCBOs vs split-load boards
A split-load board groups circuits under shared RCDs, so one fault can take out several circuits. A board with RCBOs protects each circuit individually: a fault on the kitchen sockets won't switch off your lights. We'll explain the cost difference and recommend what suits your property.
Frequently asked questions
How much does a consumer unit replacement cost in London?
It depends on the number of circuits, the type of protection, the condition of existing wiring and earthing, and access. We provide a written quotation after a survey.
Is a consumer unit change notifiable?
Yes. Replacing a consumer unit is notifiable work under Part P of the Building Regulations in England. As a NAPIT-registered contractor we notify the work for you.
Can you replace a consumer unit in a rented property?
Yes. We work with landlords and agents to arrange access with tenants and keep downtime to a minimum.