Some homes have wiring that’s perfectly serviceable at 40 years old. Others have installations that were already a liability at 20. The honest answer to how long electrical wiring lasts is: it depends on what type of wiring you have, how old your property is, and whether anyone has touched the installation since it was first put in.
Here’s what you actually need to know.
How Long Does Electrical Wiring Typically Last?
Most modern PVC-insulated wiring, installed to current standards, has a functional lifespan of around 25 to 40 years before it warrants a professional inspection. Some installations hold up well beyond that. Others degrade faster due to poor installation, rodent damage, heat exposure, or simply being run too hard for too long.
The age of your wiring matters less than its condition, but age is a reliable flag. If your home hasn’t been rewired since the 1990s or earlier, it’s worth having it looked at.
Wiring Lifespan by Type
| Wiring Type | Typical Lifespan | Common In |
| Modern PVC (T&E cable) | 25–40+ years | Post-1990s homes |
| PVC with older accessories | 20–30 years | 1970s–1990s homes |
| Lead-sheathed wiring | 40–60 years (but now dangerous) | Pre-1960s properties |
| Rubber-insulated wiring | 25–40 years (degrades badly) | 1950s–1970s homes |
| Aluminium wiring | 30–40 years (now problematic) | Some 1960s–70s builds |
| Fabric/cloth wiring | 50–80 years (long past safe use) | Pre-1950s properties |
Lead, rubber, and fabric-insulated wiring are all well past their safe service life. If your home has any of these, a rewire isn’t optional, it’s overdue.
What Are the Signs Your House Wiring Needs Replacing?
Your wiring won’t announce that it’s failing. What it will do is give you consistent, easy-to-dismiss signals that most people ignore for months or years before something serious happens.
Watch for any of these:
- Persistent tripping on the consumer unit (fuse board)
- Burning smells near sockets, switches, or the board
- Discolouration or scorch marks on outlets
- Flickering or dimming lights that aren’t a bulb issue
- Sockets or switches that feel warm to the touch
- A fuse board with rewirable fuses rather than MCBs
- No RCD protection on the consumer unit
- Round-pin sockets anywhere in the property
Any single one of these is worth investigating. More than one, and you’re not looking at maintenance, you’re looking at a rewire.
How Often Should House Wiring Be Inspected?
An Electrical Installation Condition Report (EICR) is the formal way to assess the health of your wiring. For owner-occupied homes, every 10 years is the general guideline. Rental properties in Scotland are legally required to have a valid EICR in place, with periodic testing at least every 5 years.
If you’ve just bought a property and don’t know when it was last tested, get an EICR before anything else. It’ll tell you exactly what you’re dealing with.
Does the Age of Your Property Affect How Urgently You Need to Rewire?
Almost certainly, yes. The era your home was built in is one of the strongest predictors of what’s inside the walls.
| Property Era | Likely Wiring Type | Rewire Urgency |
| Pre-1950 | Fabric or lead-sheathed | Immediate |
| 1950s–1960s | Rubber-insulated or lead | High |
| 1970s–1980s | Early PVC, possibly aluminium | Medium–High |
| 1990s–2000s | PVC T&E | Inspect; likely serviceable |
| Post-2005 | Modern PVC to current regs | Low, if well maintained |
Older properties in Glasgow and across Scotland often still have their original wiring. Tenement flats are a classic example: beautiful buildings, but the electrics can be 60, 70, even 80 years old. That’s not vintage, it’s a fire risk.
Is Old Wiring Actually Dangerous, or Is It Just Outdated?
Both, depending on type. Outdated doesn’t always mean dangerous on day one, but it does mean you’re without modern protections that genuinely save lives. No RCD protection means a fault to earth that would trip a modern board can instead cause a fatal shock or an electrical fire. Degraded rubber insulation can crack and expose live conductors inside your walls without any visible warning.
Old wiring also can’t support modern electrical loads. Homes in the 1970s weren’t designed around multi-socket extension leads, EV chargers, electric showers, and multiple large appliances running simultaneously. Pushing today’s demand through yesterday’s wiring is exactly how fires start.
Will a House Rewire Add Value to My Property?
A rewire doesn’t typically add value in the way a kitchen extension might, but it removes a major barrier to sale. Many buyers, especially those using solicitors experienced with older Scottish property, will flag outdated wiring immediately. Mortgage lenders sometimes require a satisfactory EICR before offering.
And insurers have been known to decline cover or apply exclusions on properties with unresolved electrical issues.
Think of a rewire less as a value-add and more as removing a ceiling on what the property can achieve. It opens the door to buyers who would otherwise walk away.
Is It Worth Rewiring a House Before Selling?
If an EICR has come back with a C1 or C2 classification, meaning danger present or potentially dangerous, then yes, absolutely. Trying to sell with an unsatisfactory EICR attached to your property survey is going to cost you either the sale or a significant reduction in offer price.
For properties with older but not yet condemned wiring, the calculus is a bit different. A pre-sale rewire reduces negotiation leverage for buyers, gives you something concrete to market, and removes the risk of a deal collapsing at survey. For most sellers, the cost of the rewire is more than recovered in what they don’t give away in a reduced offer.
Is a House Rewire Covered by Home Insurance?
Standard home insurance doesn’t cover the cost of rewiring as routine maintenance. What it may cover is damage caused by an electrical fault, but that’s a different thing entirely, and policies vary. Some insurers will reduce your premium once you have a current, satisfactory EICR on record. Others will require one as a condition of cover on older properties.
Check your policy wording carefully. If you’re unsure, call your insurer directly and ask whether your current EICR status affects your cover.
Ready to Find Out If Your Home Needs a Rewire? Get a Free Quote From HomeRewire
If your property is more than 25 years old, hasn’t been rewired since before 2000, or you’ve been ignoring any of the warning signs listed above, the next step is a straightforward one. HomeRewire is Scotland’s most experienced rewiring contractor, with over 6,000 completed rewires and a track record of finishing most jobs in 1 to 2 days.
There’s no pressure, no commitment, and no cost to finding out where you stand. Request a free quote today and get a clear picture of what your home needs and what it’ll take to get there.
Frequently Asked Questions
Can I stay in my home during a rewire?
In most cases, yes, though you’ll be without power for periods throughout the day. HomeRewire’s 1 to 2 day turnaround minimises disruption significantly compared to a standard week-long rewire.
Do I need to redecorate after a rewire?
Some making good is required after chasing cables into walls. The extent depends on your property and how it’s accessed. Your electrician should walk you through what to expect before work starts.
How do I know if my wiring is rubber-insulated?
If your home was built or last rewired between the 1950s and early 1970s, there’s a reasonable chance. An electrician can confirm by checking at the consumer unit or a socket. Rubber insulation typically appears brown or black and may already be brittle or crumbling.
Does a rewire include fitting a new consumer unit?
Usually, yes. A full rewire will typically include a new consumer unit with RCD protection installed to current BS 7671 standards.
What’s the difference between a full rewire and a partial rewire?
A full rewire replaces all cabling, sockets, switches, and the consumer unit throughout the property. A partial rewire addresses specific circuits or areas. Partial rewires are sometimes appropriate, but if the underlying wiring is old enough to be a concern, a full rewire is often better value long-term.
Can old wiring handle modern appliances like EV chargers or electric showers?
Not reliably. Older wiring wasn’t designed for the loads modern homes place on them. Adding a high-draw appliance to an aged installation without upgrading the circuit is a genuine risk and may also void your home insurance if a claim arises from it.
How long does an EICR take?
For most homes, between 3 and 4 hours. Larger or more complex properties may take longer.
Is there a legal requirement to rewire before selling in Scotland?
There’s no automatic legal obligation to rewire before selling, but if an EICR flags the installation as unsatisfactory, you’ll need to either remediate the issues or disclose them, which directly affects your negotiating position.
