Full House Rewire: When You Need One, What's Involved & Typical Timelines

Quick Answer: A full rewire is needed when wiring is over 25-30 years old (especially pre-1970s rubber or lead-sheathed wiring), has no RCD protection, uses old round-pin sockets, or has failed a periodic inspection with a C1 (dangerous) or significant C2 findings. A typical 3-bedroom house takes 5-7 days and requires all circuits to be replaced to BS 7671:2018+A2:2022.

Summary

A full house rewire replaces all fixed electrical wiring — from the consumer unit through to every socket, switch, light fitting, and fused spur. It is among the most disruptive but also most necessary maintenance tasks for older UK properties. Many homes built before 1970 still have their original wiring, which may be rubber-insulated, lead-sheathed, or wired in round-pin sockets — all of which are past safe service life.

The trigger is usually a failed periodic inspection (Electrical Installation Condition Report, or EICR) or a property sale where the buyer's survey flags old wiring. A C1 finding (danger present) or a pattern of C2 findings (potentially dangerous) in an EICR is strong evidence that a rewire is justified rather than piecemeal repairs.

Rewires are almost always Part P notifiable work — a new set of circuits throughout the house constitutes a new installation, not maintenance. This means using an electrician registered with a competent person scheme (NAPIT, NICEIC, SELECT in Scotland) or separately notifying building control. At completion, a full test and an Electrical Installation Certificate (EIC) must be issued.

Key Facts

Quick Reference Table

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Property Type Typical Circuit Count Wiring Duration Tradespeople Required
1-bed flat 6-8 circuits 2-3 days 1-2 electricians
2-bed terraced 8-12 circuits 3-4 days 2 electricians
3-bed semi 12-16 circuits 5-7 days 2 electricians
4-bed detached 16-22 circuits 7-10 days 2-3 electricians
5-bed detached 20-28 circuits 10-14 days 2-3 electricians
Wiring Condition Likely Age Action
Round-pin sockets Pre-1960s Rewire immediately
Rubber insulation, cloth covered Pre-1966 Rewire immediately
Lead-sheathed wiring Pre-1960s Rewire immediately
Red/black cable, no earth 1966-1990s EICR; likely rewire
Red/black cable, with earth 1966-2004 EICR; assess age and condition
Brown/blue cable (no RCD) Post-2004 EICR; upgrade consumer unit
Brown/blue cable with RCDs Modern Periodic EICR every 10 years

Detailed Guidance

Signs a Rewire Is Needed

The following are strong indicators:

  1. Round-pin sockets — These predate BS 1363 and are over 60 years old
  2. Rubber or cloth-covered cables — Can be spotted in the loft or where cables are exposed; rubber becomes brittle and cracks with age
  3. Older fuse box with rewirable fuses — No RCD protection; old fuses may have been incorrectly rated
  4. Pendant light fittings with no earth terminal — Indicates old two-core only wiring
  5. Sockets with only two holes — No earth pin; dangerous and illegal for most modern appliances
  6. EICR with multiple C2 findings — Potentially dangerous conditions found; rewire more cost-effective than multiple repairs
  7. Sockets and switches that spark or are warm to touch — Can indicate deteriorating insulation or poor connections
  8. Burning smell from sockets or switches — Immediate safety concern; investigate before rewire decision

The Rewire Process: Step by Step

Before starting:

Day 1-2 (First Fix — Wiring):

Days 3-5 (Plastering and Making Good):

Second Fix (after plastering):

Testing and Certification:

Consumer Unit Requirements

A modern rewire must include a consumer unit meeting BS EN 61439-3 (formerly BS 60439-3). Key requirements:

Dealing with Asbestos

Properties built between approximately 1945 and 1999 may contain asbestos. During a rewire, chasing walls and drilling through ceiling/floor voids can disturb asbestos-containing materials (ACMs). The most common ACMs encountered by electricians include:

Before starting a rewire in a property of this era, an asbestos survey should be commissioned if not already done, or at minimum a visual risk assessment carried out. See asbestos for full guidance.

Making Good

Making good after a rewire is often not included in the electrician's price. Clarify this in the quote:

A clear scope in the quote prevents disputes. See building control for certification requirements.

Frequently Asked Questions

How long does a house rewire take?

A typical 3-bedroom semi takes 5-7 working days for two electricians to complete the wiring. This does not include plastering, making good, or redecoration — allow at least another week for the property to be plastered and dried before second fix, then 2-3 days for second fix. Total project time from start to habitable: 3-4 weeks for a typical house.

Do I need to move out during a rewire?

You don't have to, but it's highly recommended for rooms being worked on. Electricians need to access every room, and dust from chasing is significant. Many customers stay with family for the wiring first fix, then return when basic power is restored at the end of each day. At minimum, expect loss of power for parts of each day and significant disruption.

What's the difference between a rewire and a consumer unit upgrade?

A consumer unit upgrade replaces only the fuse board and adds RCD/RCBO protection to existing circuits. It doesn't replace any of the wiring itself. This is appropriate when wiring is in good condition (confirmed by EICR) but the fuse board is old. A full rewire replaces everything — the consumer unit plus all the wiring back to each outlet. If an EICR shows the wiring itself is degraded, a consumer unit upgrade won't fix the underlying problem.

Can I live in the house while one room at a time is rewired?

Yes, in theory — this is sometimes called a "phased rewire." In practice it costs more, is more disruptive over a longer period, and makes making good harder because you're never finishing a complete room. Most electricians will advise against it unless there's a strong reason (for example, a commercial property that can't close completely).

Regulations & Standards