Signs your house needs rewiring, and what it costs

The most common signs your house needs rewiring are an old fuse box with rewireable fuses, rubber or fabric-insulated cable, lighting circuits with no earth, round-pin sockets, scorch marks around sockets or switches, and frequent tripping or flickering lights. None of these on its own proves a full rewire is needed. An Electrical Installation Condition Report (EICR) is usually the right first step to find out what state the wiring is really in.

Wiring does not last forever. Insulation ages, older installations were never designed for the number of appliances in a modern home, and safety standards have moved on a long way. We are a NAPIT-approved electrician based in Buckhurst Hill, working across Essex and North and East London since 1999, in everything from Victorian terraces to post-war houses and modern flats.

Warning signs to look out for

• Old rewireable fuses. A fuse box with fuse carriers containing fuse wire usually means the installation is decades old. It also means there is no RCD protection, one of the most important safety features in a modern installation.
• Rubber, fabric or lead-sheathed cable. Cable insulated with rubber, covered in fabric or sheathed in lead was common in homes wired before the 1960s. Over time the rubber goes brittle and crumbles, leaving live conductors exposed. If you see it at the fuse board, in the loft or behind a light fitting, have it checked.
• Lighting circuits with no earth. Lighting circuits installed before the mid-1960s often had no earth conductor. That makes metal light fittings and metal switch plates unsafe to fit, and it is a common finding in older homes that have never been fully rewired.
• Round-pin sockets. Round-pin sockets come from before modern square-pin sockets became standard, and wiring of that age almost always needs replacing.
• Scorch marks, heat or a burning smell. Brown marks around a socket, a switch that feels warm or a smell of hot plastic are signs of overheating. Our guide on a burning smell from a plug socket explains what to do.
• Frequent tripping or blown fuses. An occasional trip when an appliance fails is normal. Regular tripping with no obvious cause can point to damaged insulation or a fault in the wiring.
• Flickering or dimming lights. Lights that flicker when appliances switch on, or dim for no clear reason, can indicate loose connections or overloaded circuits. Sometimes the cause is simply an LED bulb that does not suit the dimmer, but it is worth checking.
• Not enough sockets. Heavy use of extension leads and adaptors is a sign the installation was designed for a very different way of living, and overloaded extension leads are a fire risk in their own right.

One thing that is not proof on its own is red and black wiring. Those were the standard UK colours until the mid-2000s, when brown and blue took over, and PVC cable from that era is often in perfectly good condition. The condition of the wiring matters far more than its colour.

Why an EICR is usually the right first step

If you are unsure about your wiring, the sensible starting point is an EICR rather than a rewire quote. An EICR is a thorough inspection and test of the whole fixed installation. It shows the condition of each circuit, whether the earthing and bonding are adequate, and whether anything is dangerous or needs improving. You can read more about electrical testing and inspection on our services page.

An EICR is especially worth having when you buy an older home, before a major renovation, or if the installation has not been checked for many years. A common guide is to have an owner-occupied home inspected at least every ten years, while private landlords in England must have one done at least every five years.

Often the report shows that the wiring itself is sound and only certain items need attention, such as a new consumer unit, improved earthing or replacing a few damaged accessories. In other cases it confirms that the installation has reached the end of its life.

Full rewire or partial rewire?

A full rewire replaces the cables, sockets, switches and light fittings throughout the house, and usually the consumer unit as well. It is the right choice when the cable itself is old, damaged or unsafe, such as rubber-insulated wiring, or when the layout no longer suits the way you live.

A partial rewire replaces some circuits and keeps others that test well. For example, the lighting circuits might need replacing because they have no earth, while the socket circuits were renewed more recently. A partial rewire can make sense, but think about the long term: if most of the house is likely to need work within a few years, doing it all at once is often less disruptive.

If you are planning an extension, a new kitchen or a loft conversion, it is usually worth rewiring at the same time, before plastering and decorating. We carry out full and partial rewires as part of our installations work.

What a rewire involves and how long it takes

A rewire is carried out in stages:

1. Survey and planning. Agreeing where you want sockets, switches, lights and any outdoor or data points, and planning the cable routes.
2. First fix. Lifting floorboards, cutting channels into walls, running new cables and fitting back boxes. This is the messiest stage, and rooms need to be as clear as possible.
3. Second fix. Once the walls have been plastered, fitting the sockets, switches, light fittings and new consumer unit, then connecting everything up.
4. Testing and certification. Testing every circuit and issuing an Electrical Installation Certificate. A rewire is notifiable work under Part P of the Building Regulations, and as a NAPIT-approved contractor we can self-certify it.

For an average house, a rewire often takes around 5-10 working days, depending on the size of the property, access and whether you are living there during the work. You can sometimes stay in the house, but expect dust, noise and the power being off for parts of the day.

Making good, meaning plastering the chased walls and redecorating, is usually a separate job for a plasterer and decorator. Plastering normally happens between first and second fix, so it helps to book them early, and it is worth checking whether any quote you get includes it.

How much does a house rewire cost?

House rewire cost varies a lot, so treat these figures as general UK guidance only. As a rough guide, rewiring a typical three-bedroom house commonly costs somewhere around £4,500-£7,500. Smaller flats usually cost less and larger houses more. The main things that affect the price are:

• The size of the property and the number of circuits.
• How many sockets, switches and lights you want, and any extras such as outdoor sockets, data points or smoke alarms.
• Access, such as solid floors, ornate ceilings or finished decoration that has to be protected.
• Whether the house is empty or occupied while the work is done.
• Whether a new consumer unit is included, which it usually is with a full rewire.

Prices vary from home to home, so for an estimate for your own property use our instant quote tool.

If any of these warning signs sound familiar, get an instant estimate on our instant quote page or call 07973 781349 and we can arrange an inspection.