Full House Rewiring in South Wales: What to Expect, Costs & Timescales

A full house rewire is one of the most disruptive — and most important — electrical jobs a property can undergo. Done properly, a rewire gives your home a completely fresh electrical infrastructure that will last 25–40 years. Done poorly or left too long, outdated wiring becomes a serious fire and electrocution risk. Here's what South Wales homeowners need to know.

When Does a Property Need Rewiring?

Wiring doesn't fail overnight — it deteriorates gradually over decades. The following are the most reliable indicators that a property's wiring may be at or beyond end-of-life:

• Rubber or lead-insulated wiring: Pre-1960s rubber insulation becomes brittle with age and is a fire hazard. If you can see rubber-sheathed cables, a rewire is overdue.
• Aluminium wiring (1960s–70s): Common in homes built during this period, aluminium wiring expands and contracts more than copper, leading to loose connections over time.
• Unsatisfactory EICR: An electrician who carries out an EICR inspection may find the extent of deterioration is too widespread to address circuit-by-circuit — at which point a rewire is the most practical and cost-effective solution.
• No earth bonding or outdated accessories: Round-pin sockets, no earth on sockets, single-gang light switches — these are indicators of very old wiring systems.
• Property hasn't been rewired in 30+ years: If you're unsure, a pre-purchase EICR or homebuyer electrical report will tell you immediately.

What Happens During a Rewire?

A rewire involves replacing every circuit from the consumer unit outward — all lighting cables, socket circuits, cooker circuits, shower feeds, and specialist circuits. Here's the typical sequence:

How Disruptive Is a Rewire?

Full rewires are disruptive — there's no way around it. Floorboards come up, walls may be chased, and the property has no power for periods during the work. Most homeowners in South Wales choose to live elsewhere during a full rewire if possible, though this depends on the size of the property and the scope of work.

A typical 3-bedroom semi-detached house takes 3–5 days. A 4–5 bedroom detached property can take 7–10 days. We work to minimise disruption by keeping individual rooms habitable during the process where possible.

How Much Does a Rewire Cost in South Wales?

Can I Stay in the House During a Rewire?

Some homeowners do stay in the property during a rewire, particularly if the work is being phased room-by-room. Your electrician will try to maintain a "live" area where possible. However, for a full rewire of an occupied property, expect at least a week of significant disruption — no power in sections of the house, dust from chasing, and floorboards up in multiple rooms simultaneously.

Our electrical installations team across South Wales will discuss your individual circumstances and plan the work in a way that suits your situation.

After the Rewire: What Documentation Should I Receive?

At completion of any rewire, you should receive:

• Electrical Installation Certificate (EIC) — signed by the installing electrician
• Schedule of Inspections and Test Results — confirming every circuit passed testing
• Building Regulations Completion Certificate — from NAPIT or your local authority

Keep these documents safely — they will be required when you sell the property and may be requested by your insurer.