Overheating junction box or loft wiring — Caerphilly callout and diagnosis
Overheating junction box or loft wiring: we survey, we test, we quote. In that order, every time. Available throughout Caerphilly, including Newport.
Do this before we arrive
- In this property type: switch off the affected circuit at the board and leave it off — do not test it by switching it back on.
- Do not disturb or pull at loft cabling; brittle insulation crumbles when moved. You will be shown it on the day.
- As a rule, note any smell of hot plastic in the loft or upstairs landing and mention it when you call.
Please note: loft cabling covered by insulation carries less current safely than the same cable in free air. Where a circuit is loaded near its limit, burying it in insulation is itself a fault condition.
You can spend a lot on overheating junction box or loft wiring or very little. Which one is right depends on measurements, not on the quote.
A quote that arrives before any testing is a guess with a number on it. We do it the other way round. For new-build estates around Bedwas and Trecenydd that detail matters more than it does elsewhere.
We would rather turn a Caerphilly job down than take on something we cannot certificate honestly. We would explain the same thing on site, just with the board open.
We do not upsell a full replacement where a component is at fault, and we do not patch something that has reached the end of its life. That is the honest version, rather than the version that sells more work.
Caerphilly properties near Cardiff are covered on the same schedule, so a joint visit is often possible if a neighbour needs the same thing. Around CF83 it is if the loft has multiple that decides how long the visit takes.
The paperwork for overheating junction box or loft wiring is only useful if it reflects what is actually installed, which is why circuits get identified rather than assumed. Anything else found on the day is raised with you before it is touched.
You deal with the same electrician from first call to final certificate. The regulations change; the approach of measuring before advising does not.
Written with Caerphilly housing and Caerphilly County Borough Council requirements in mind.

What testing normally reveals
- Insulation packed over the box, raising the temperature, and it does not resolve itself with time.
- In Caerphilly County Borough Council housing of this age, old rubber-insulated cable jointed onto modern PVC without support accounts for a good share of cases.
- Screw terminals. It rarely announces itself until load is applied.
- Too many conductors forced into a box rated — one of several possibilities, all of which get checked.
What happens on site
- We isolate, inspect and re-make the joint, recorded so it can be checked later.
- If the loft has multiple ageing joints we set. Nothing gets replaced on a hunch.
- We isolate, inspect and re-make the joint. Anything outside this scope is quoted separately and in writing.
The commercial detail: isolation, joint remediation and circuit testing quoted as one visit; wider loft rewiring priced separately.
Why this comes up in Caerphilly
Alongside domestic calls we cover Caerphilly Business Park and Pontygwindy estate, where the same fault shows up on a larger scale.
Most of our Caerphilly work sits between Cardiff and the Rhymney valley.
If your address is closer to Ystrad Mynach than to Caerphilly itself, nothing changes on price or availability.
Questions we get asked
How long does a visit usually take?
It depends on circuit count and access. We give a time estimate for the Caerphilly address when the job is booked rather than afterwards.
Will you need to lift floors?
Only if the findings require it, and only with your agreement. We use existing access wherever it exists.
Is this notifiable work?
It depends on the scope. Where it is, the notification goes through Caerphilly County Borough Council and you receive the certificate that comes with it.
Can you talk to my letting agent directly?
Yes, if you tell us who to contact. Access and reporting can both go through them.
Do you charge more for Caerphilly callouts?
No. Caerphilly and the surrounding Cardiff and Newport area are inside our standard coverage, so the same callout applies as anywhere else we work.
Ask a question before booking
Give us a rough idea of the property size and age and we can be much more specific about scope. Caerphilly County Borough Council notification is handled by us where the work requires it.
