A full electrical rewire is one of the most disruptive and least glamorous home improvement projects — but in older properties it's often essential for safety and compliance. This guide covers the full cost to rewire a house in the UK, what the work involves, and how to tell whether your property needs it.
How Much Does a Full Rewire Cost?
Rewiring costs in the UK vary significantly based on property size, the complexity of the existing installation, and your location. Prices are generally higher in London and the South East. Here are typical ranges for 2025:
| Property type | Typical cost |
|---|---|
| 1-bedroom flat | £2,000 – £3,500 |
| 2-bedroom house | £2,500 – £4,000 |
| 3-bedroom semi-detached | £3,500 – £5,500 |
| 4-bedroom detached | £5,000 – £8,000 |
| 5-bedroom detached | £7,000 – £12,000+ |
These figures are for the electrical works only. Redecoration after a rewire — filling chased-in cables, repainting, making good plaster — adds further cost and is typically the homeowner's responsibility unless agreed otherwise with the contractor.
What Does a Full Rewire Involve?
A full rewire replaces all of the electrical wiring, accessories, and the consumer unit (fuse board) in a property. In practice, this means:
Consumer Unit Replacement
The old fuse board is replaced with a modern consumer unit containing RCDs (residual current devices) and MCBs (miniature circuit breakers). Modern consumer units provide significantly better protection against electric shocks and electrical fires than older fuse-wire or cartridge-fuse boards.
New Circuits
All circuits are replaced — lighting circuits, ring main power circuits, and dedicated circuits for high-demand appliances (electric cooker, shower, washing machine). The number and layout of circuits are designed to meet current Part P of the Building Regulations.
New Cables
Old wiring is stripped out and replaced with new twin-and-earth cable run through the wall via chases (channels cut into the plasterwork) or surface-mounted trunking. In a full rewire, cables are typically chased in to avoid trunking throughout the property.
New Accessories
All sockets, switches, and light fittings are replaced. Standard specification is white plastic; a brushed brass, chrome, or black finish costs more but makes a noticeable aesthetic difference. USB sockets are commonly specified in modern rewires.
Signs You Need a Rewire
Old Rubber or Lead-Sheathed Wiring
If your property was built before the 1970s and hasn't been rewired, it may still contain rubber-insulated or lead-sheathed cables. These have a lifespan of around 25–30 years and are almost certainly beyond that now — the rubber insulation cracks and becomes a fire risk. If you see brown or black cables in your loft, this is a strong indicator.
Fuses Rather Than MCBs
If your consumer unit contains rewireable fuses or cartridge fuses rather than circuit breakers (MCBs), it predates modern safety standards. This alone doesn't require a full rewire, but a consumer unit upgrade (typically £300–£600) should be considered as a minimum.
No RCD Protection
A modern consumer unit will have at least two RCDs protecting all circuits. Without RCD protection, there is no automatic disconnection in the event of an electric shock from a faulty appliance.
Lack of Earthing
Properties wired before the 1960s may have no earthing at all. You can check by looking at your consumer unit — an unearthed installation will have no earth cable connected. This is a serious safety deficiency.
Persistent Problems
Frequently tripping circuits, scorched sockets, flickering lights, or a burning smell are all indicators of a wiring problem that needs professional investigation.
Part P and Building Regulations
All electrical work in dwellings in England and Wales is notifiable under Part P of the Building Regulations unless it is minor maintenance work (like-for-like replacements). A full rewire is major notifiable work and must either be:
- Carried out by a registered competent person (see below), who self-certifies the work; or
- Submitted to your local Building Control authority for inspection and sign-off
When the work is signed off — either by the contractor's self-certification or by Building Control — you receive an Electrical Installation Certificate (EIC). Keep this document: you will need it when you sell the property, and mortgage lenders increasingly require it for older homes.
Finding a Registered Electrician
For any notifiable electrical work, use an electrician registered with a government-approved competent persons scheme. The two main schemes in the UK are:
- NICEIC (National Inspection Council for Electrical Installation Contracting)
- NAPIT (National Association of Professional Inspectors and Testers)
Both operate online registers where you can verify a contractor's current registration. A registered electrician is authorised to self-certify their own work under Part P, removing the need for a separate Building Control application.
Always obtain at least three written quotes. Quotes should itemise the scope of work, confirm the specification (cable types, consumer unit brand, accessory finish), and confirm what is and is not included. Agree in writing who is responsible for redecoration after the work is complete.
How Disruptive Is a Rewire?
A full rewire is one of the most disruptive renovation projects a homeowner can undertake. Electricians will need access to every room, floors may need lifting to run cables, and plasterwork will be chased and made good throughout. In most cases, the property is best vacated during the works.
Duration depends on property size:
- 2-bedroom flat: 3–5 days
- 3-bedroom semi: 5–7 days
- 4-bedroom detached: 7–10 days
Factor in time for replastering, drying out, and redecoration — the total programme from start to fully decorated finish is typically three to six weeks.
Is a Rewire Worth It?
If your property needs rewiring, there's no sensible alternative — an unsafe electrical installation is a risk to life and will be flagged by any competent surveyor, making the property difficult to insure and sell. For buy-to-let investors, an up-to-date Electrical Installation Condition Report (EICR) is a legal requirement. For homeowners buying an older property, factoring rewiring costs into your offer price is simply prudent.
For a comprehensive guide covering all the signs you need rewiring, EICR condition codes, Part P compliance routes, consumer unit upgrade options, and the full 5–10 day disruption timeline, see our detailed rewiring a house UK guide.