Bringing an older home’s electrics up to standard: signs, survey, typical works, certificate
Bringing electrics up to standard starts with a survey of the installation by a professional electrician. Electrics are the first safety item in an older home: they are dealt with before the finishes, not after. This dossier says how to recognise tired wiring, what the survey must contain, how the typical works unfold and when the certificate of compliance applies.
By Jean Mascla, founder of Home SelectUpdated · 8 min read
Recognising tired wiring
An ageing installation sends signals long before the breakdown. Learn to read them:
a hotchpotch of fuses, replaced over the decades with mismatched models;
ungrounded sockets that take no earth pin, or chains of extension leads hidden behind furniture;
a consumer unit from another era, with no differentiated protections and no identifiable residual current device;
repeated tripping as soon as two appliances heat together;
scorch marks, odd smells, bare cables under broken trunking.
A single one of these signs justifies an inspection. Several together call for swift action: switch off the circuit concerned, unplug the suspect appliance and bring in a professional. From abroad, these signals show up during an inspection visit, provided someone looks for them and photographs them for you.
To these signs add the history of the property itself. The older the flat, the higher the odds of an installation altered over the years with no overall plan: every decade added its circuit, its extension lead, its make-do fix. So the real question is not whether the installation is old, it almost always is, but whether it has ever been overhauled in depth, by whom, and over what scope. That is precisely what the survey establishes.
Why do electrics come before the finishes?
Two reasons impose this order, and neither tolerates exceptions.
Safety, first. A worn-out installation means a risk of electric shock and a risk of fire starting, two dangers that do not wait. The French electrical standard sets out the requirements an installation must meet, from the consumer unit to the bathrooms: bringing it up to standard exists first to protect people.
The logic of the works, next. Circuits hide inside walls and floors: installing them means chasing channels, cutting and filling. It is light structural work, incompatible with brand-new finishes. Repainting before the electrics amounts to dressing a wall that is destined for a trench. In an old flat, electrics are redone first and decoration last: it is the order followed by all the Works and renovation dossiers.
One further reason, specific to absent owners: an installation brought back to order simplifies everything that follows. Home insurance is taken out more calmly, a prospective buyer asks fewer questions. Electrics are one of those projects that are invisible once finished: nobody notices them, except precisely the people who know they have been done.
The electrical survey, the true starting point
A survey by a professional electrician maps the real installation, not the one you imagine: consumer unit, number and condition of circuits, presence and continuity of the earth, protections in place, compliance of rooms with water. It ends with a written report, ordered by priority, distinguishing what threatens people from what is merely a matter of comfort.
This report plays three roles. It secures: immediate dangers are identified and neutralised first. It frames: the quotes from the electricians approached rest on the same described condition, and are therefore comparable. It documents: from abroad, this written and photographed report is your eyes on an installation you cannot see. Ask for it before any commitment, and keep it in the property file.
A serious survey contains, at minimum:
the record of the existing consumer unit and its protections;
the mapping of known circuits, room by room;
the presence, absence or doubt over the earthing;
the condition of rooms with water against the safety requirements;
a list of recommendations in order of priority, from urgent to comfortable.
The typical works, step by step
Once the survey is done, the works follow a proven sequence. Here it is, with the aim of each step and who carries it out.
Step
Aim
Who
Full diagnosis
map the installation, spot the dangers, prioritise
a professional electrician
Replacing the consumer unit
protections matched to each circuit, accessible main switch
a professional electrician
Overhauling the circuits
remove hazardous spurs, spread usage room by room
a professional electrician
Earthing
drain leakage currents, protect people
an electrician, sometimes with the managing agent
Rooms with water
equipotential bonding and protection volumes around water points
a professional electrician
Final check and certificate
verify the whole and, where applicable, certify conformity
the authorised body or the electrician, depending on the case
Opening and monitoring the site
let the tradesmen in, track progress, document
you, or a representative on site
The first two lines are not up for debate: they carry the core of the safety. The rest adjusts to the survey. This site is run like any other: the dossier on running building works from abroad covers the organisation, the selection of tradesmen and the follow-up. When it comes to tracking progress, the dossier on following a building site remotely details the routine of photos and reports.
Dinard, Bretagne
When does the certificate of conformity apply?
When the installation is deeply modified, a new consumer unit or new circuits, a certificate of conformity may be required, notably by your insurer or for certain official procedures. It is issued under the conditions laid down by the regulations, by the authorised body or professional depending on the case. Ask the electrician, before the works begin, whether your situation calls for one: the answer shapes the end of the site.
Keep this certificate with the property file. On the day of a sale or a change of insurer, it proves the installation was redone to the rules and makes the formalities easier. Without it, the electrical survey required on a sale under the regulations remains the reference document, with the reservations it contains.
While waiting for the works, day-to-day safety
A full electrical project is not decided over a weekend, least of all from abroad. In the meantime, a few small repairs reduce the everyday risk: replacing a cracked socket, permanently unplugging a suspect appliance, relieving an overloaded extension lead. The small repairs coordinated by the Home Select concierge service can carry out these gestures and send you photos before and after.
One organising tip, finally: group these small repairs with the visits already planned, rather than triggering a trip for the sake of one socket. Every visit to the property is a chance to check, photograph and note; wasting it would be a pity. The list of signals spotted at the last visit thus becomes the works list of the next one, and the electrical file builds itself, visit after visit.
The electrics of an old flat cannot be improvised, but they can be prepared calmly: a professional survey, an orderly project, a certificate at the end.
What Home Select organises for your property’s electrics
Works are costed before the purchase offer, not after: your Home Select property finder brings a contractor or a project manager to the second viewing, so that the price offered accounts for what remains to be done.
After the signing, we introduce the project manager or architect who runs the project in your place, and the concierge service that opens the door and photographs progress. Running the works, the quotes and the handover are theirs, under their responsibility: our role is that there is a single point of entry.
Frequently asked questions
Is a rewiring required to sell an old home?
On a sale, an electrical survey points out the risks of an old installation without forcing a full rewiring. But an installation brought back to order reassures buyers and avoids difficult negotiations on the price. A certificate of conformity, where one exists, becomes a strong argument.
Can the flat be lived in during the works?
Often yes, area by area, with short power cuts while the circuits are switched over. For a second home, it is best to schedule the works between two stays so the electrician has free access.
Does the whole installation have to be replaced at once?
Not necessarily, but it is wiser to deal in one go with whatever requires opening the walls. Coming back several times to the same rooms costs more and damages the finishes. The initial survey lets you prioritise.
When does the certificate of conformity apply?
When the installation is deeply modified, a new consumer unit or new circuits, a certificate of conformity may be required, notably by your insurer or for certain official procedures. It is issued under the conditions laid down by the regulations, by the authorised body or professional depending on the case. Ask the electrician, before the works begin, whether your situation calls for one: the answer shapes the end of the site.
Which signs show that wiring needs redoing?
Mismatched fuses replaced over the decades, unearthed sockets or daisy-chained power strips, a consumer unit without separate protections or a residual current device, repeated tripping as soon as two appliances heat up, scorch marks, odd smells or exposed cables. A single sign justifies an inspection; several call for switching off the circuit concerned and bringing in an electrician.
How does an electrical upgrade unfold?
After the survey, the consumer unit is replaced to give each circuit its protection and an accessible main switch; the circuits are reworked to remove haphazard branches; the earth connection is checked, sometimes with the managing agent; wet rooms get their equipotential bonding and protection zones. A final check closes the works, with a certificate of compliance where the situation requires one.
What should an electrical survey contain?
A record of the consumer unit and its protections, a room-by-room map of the circuits, whether there is an earth connection, the state of wet rooms against safety requirements, and ranked recommendations, from urgent to comfort. Written and photographed, it gives the quotes a common basis and gives you eyes on an installation you cannot see from abroad.
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