No Main Earth on an EICR: What It Means

“No main earth” on an electrical report means the inspector could not find a working connection between your installation’s main earthing terminal and any means of earthing — no earth from the supply, and no earth electrode of your own. The metalwork of your installation has nowhere to send a fault current. In the coding guidance most London inspectors work to, a complete absence of earthing is a C1 — danger present, and it fails the report immediately. It is normally fixable in a single visit: either the distribution network operator provides an earth terminal at your cut-out, or we install an earth electrode and convert the installation to a TT arrangement. Labour and certification for the earthing and bonding work typically runs from £180, and no job leaves here below our minimum charge of £108 (£90 + VAT).

We are F & A Electrical — NICEIC Approved, Part P registered, working to the current edition of BS 7671 — based at Ten 87 Studios, Markfield Rd, Tottenham N15. We find this fault most weeks, right across our patch: Haringey, Hackney, Islington, Enfield, Waltham Forest, Camden, Barnet, Newham and Tower Hamlets. Call 07407 627542 or 07500 721453.

What “no main earth” actually means

Every electrical installation in the UK has to have a means of earthing. It is the deliberate, low-resistance path that lets a line-to-earth fault dump enough current to blow a fuse or trip a breaker in a fraction of a second, instead of leaving the fault sitting there. The point in your installation where that path starts is the main earthing terminal — usually a brass bar or block in or beside the consumer unit, with the earthing conductor, the bonding conductors and all the circuit protective conductors landing on it.

“No main earth” is the inspector’s shorthand for: that terminal is not connected to earth. It shows up in a few different ways on the day:

Nothing at the cut-out. The supply is TN-C-S (what most people call PME) or TN-S, there should be an earth terminal provided by the network, and there simply isn’t one — or there is one and nobody ever ran a conductor from it to the board.
An earth clamp on a dead water pipe. The commonest version by a mile, and the one that fools people. A clamp sits on the incoming water main, labelled, painted, looking perfectly correct. But the water company renewed the service in blue plastic at the boundary years ago, so the pipe it is clamped to stops a metre inside the wall. The earth goes nowhere.
A broken or disconnected earthing conductor. Cut during a kitchen refit, left off after a meter move, snapped inside a corroded clamp in a damp meter cupboard.
An earth electrode that doesn’t work. On a TT installation, a rod that has corroded through, been concreted over, or was never driven deep enough — so the measured resistance is far too high to be relied on.
No earthing at all because the installation predates it. Rare now, but it still turns up in houses that have been in one family for fifty years and never had a board change.

It is a different finding from “no earth on the lighting circuit”, which is about missing circuit protective conductors in the fixed wiring, and different again from “main bonding absent or undersized”, which is about the conductors that tie your gas and water pipework to the earthing terminal (we price and explain that separately in main bonding cost in London). All three often appear on the same report. We cover the coding of each one on our guide to what C1, C2 and C3 mean on an EICR.

Why is no main earth dangerous, if the lights still work?

Because nothing in the installation tells you it is wrong until the day it matters.

With a proper earth, a live conductor touching the metal case of a washing machine creates a short circuit to earth. Hundreds or thousands of amps flow, and the circuit breaker opens in well under a second. With no earth, that same fault does almost nothing. The case simply becomes live, quietly, at 230 V. The breaker does not trip because no appreciable current is flowing anywhere. The appliance keeps working. The fault stays there for days or years — until a person completes the circuit to earth through their own body, standing on a kitchen floor or holding a tap with the other hand.

Two things people get wrong about this:

“I’ve got an RCD, so I’m covered.” An RCD measures the imbalance between line and neutral, so it will operate when current leaves the circuit through a person. It is genuinely better than nothing, and it is exactly why a TT installation must be RCD protected throughout. But it is a last line of defence that acts after someone has become part of the circuit. It does not clear a fault to exposed metalwork on its own, and on many older boards the RCD only covers half the circuits.
“The surveyor said the wiring is in good condition.” The condition of the cable has nothing to do with it. We regularly find tidy, sound, well-installed 1990s wiring with no working earth at the front of it. The installation is as good as its earthing arrangement, and that is a single connection in a cupboard.

Is no main earth a C1 or a C2 on an EICR?

Where there is no means of earthing and the installation has exposed metalwork and Class I appliances — which is to say, essentially every home — the coding guidance most inspectors work to (Electrical Safety First’s Best Practice Guide 4) puts the absence of earthing at C1, danger present. Either code fails the report, but the difference matters to you:

C1 means danger is present now. A competent inspector will tell you on the spot, will usually make it safe or isolate before leaving, and will say so in writing. For a rented home, the Electrical Safety Standards in the Private Rented Sector regulations require remedial work within 28 days or sooner if the report specifies — and a C1 is the definition of “sooner”. Do not sit on it for 28 days.
C2 means potentially dangerous — there is a path, but it is compromised: undersized earthing conductor, high electrode resistance, bonding missing. Still a fail, still needs fixing, not an emergency this afternoon. Our page on what a C2 means on an EICR goes through the common ones.
FI — further investigation — sometimes appears instead, where the inspector could not get at the intake to confirm either way. That is a limitation, not a clean bill of health; see what a limitation on an EICR means.

Honest caveat: coding is a judgement the inspector signs their name to, and two good electricians can land on C1 and C2 for the same intake depending on what they found connected. What should never happen is the finding being written as C3, “improvement recommended”. Earthing is not an improvement.

Who provides the earth — the network or the electrician?

This is the question that saves people the most money, because the answer is often “not us, and not at your cost”.

The service cable, the cut-out, the main fuse and the earth terminal on the supply side belong to the distribution network operator — in London that is UK Power Networks. Everything from the meter onwards, including the main earthing conductor, the bonding and the consumer unit, is yours. We set that boundary out in full on who is responsible for the main fuse, cut-out and meter tails.

So the first move on a no-earth intake is to find out what the network can give you:

We identify the supply type at the cut-out. A concentric or waveform service cable usually means an earth can be provided (TN-C-S). An older lead-sheathed or paper-insulated cable may support TN-S, or may support nothing.
If an earth terminal can be provided, we ask UK Power Networks for it. On an existing domestic supply they do not normally charge to provide an earthing terminal. What it costs you is the waiting — their visit is scheduled, not same-day.
If the network cannot provide an earth, you go TT. We install your own earth electrode, test its resistance, and make sure every circuit in the property is RCD protected, because on a TT system the RCD is doing the work the earth fault loop cannot.

Where there is a smart meter exchange booked, this often surfaces the hard way: the meter fitter arrives, finds no main earth, and refuses to proceed — which is the correct call on their part. We deal with that a lot; see smart meter installer refused to fit.

What does putting it right involve?

On a straightforward London intake, all of this is one visit:

A new main earthing conductor. On a standard 100 A domestic supply that is normally 16 mm², green-and-yellow, from the network’s earth terminal to the main earthing terminal at the board, with a labelled connection at each end.
Main protective bonding. Normally 10 mm² to the incoming gas and water services, clamped within 600 mm of the meter or the point of entry, on the consumer’s side of the stopcock. Oil, and structural steel or metallic ducting where it applies.
Earth electrode, on a TT installation. Rod driven in, resistance measured, and the figure recorded on the certificate — not estimated. Combined with a 100 mA time-delayed main switch and 30 mA protection on the final circuits so the two devices discriminate.
A board change, if the existing unit cannot take what is needed. Plenty of these jobs end up as a consumer unit replacement anyway, because a 1980s split-load or rewirable board has no way to give every circuit RCD protection. Our fuse board replacement page has the full breakdown.
Certification. Earthing and bonding work gets a Minor Works certificate; a board change gets an Electrical Installation Certificate and Part P notification through our scheme. What Part P certification covers explains why that paperwork is the thing a solicitor or a council will ask for later.

Two things we will tell you honestly rather than sell you. First, a consumer unit change on its own does not fix no main earth — a new board bolted onto a dead earth is a new board with the same C1. Any electrician quoting a board swap without mentioning the intake has not looked at the intake. Second, if the circuit protective conductors are missing in the fixed wiring as well as at the intake, earthing the board does not earth the sockets, and you are looking at a partial or full rewire; the ranges are on our house rewire cost guide and, for flats, the cost to rewire a flat.

What does it cost to fix no main earth in London?

Prices below are labour and certification only, inclusive of VAT. Materials — conductors, clamps, rods, boards, accessories — are itemised separately on the quote. Our minimum charge is £108 (£90 + VAT), which is one hour at the standard rate of £90 per hour + VAT, and nothing is priced below it. Out of hours is £60 + VAT per half hour on top.

Work	From (labour + certification, inc VAT)
Attend, identify the supply type, trace the earthing arrangement, findings in writing	£108 (first hour) — comes off the job if you go ahead
New main earthing conductor, cut-out to board in the same cupboard	from £180
Main protective bonding to gas and water, both services within easy reach	from £180
Bonding with long or awkward runs — meter outside, stopcock under the stairs, gas in another room	£240–£420
Earth electrode installed, resistance tested, TT arrangement recorded	from £300
Earthing and bonding done alongside other work on the same visit	from £108
Consumer unit replacement, 6-way, flat or small house	from £550
Consumer unit replacement, 10-way, typical 3-bed	from £650
Consumer unit replacement, 12-way and up	from £750
Full TT conversion — electrode, 100 mA S-type main switch, all-RCBO board, bonding	from £850
Board change and EICR on the same visit	from £690
EICR — flat or 1-bed / 2-bed / 3-bed / 4-bed / large or HMO	£140 / £170 / £200 / £250 / £300–£400
HMO electrical compliance, 3–6 units	£250–£500
Commercial EICR	from £220

Applying to UK Power Networks for an earthing terminal is not something we charge a separate fee for when we are doing the work that follows. Full price list on our pricing page and our 2026 EICR cost guide.

Where we find this most often in North London

Four patterns account for nearly all of it, and they are all local to the stock we work in:

Renewed water services. Victorian and Edwardian terraces where the lead service was replaced in plastic at the boundary and nobody told the electrician. We find this on the Tottenham High Road corridor, across Wood Green and Bounds Green, in Walthamstow, and in the big divided houses off Lordship Lane and St Ann’s Road. The clamp is still there. The earth is not. See electrician in Tottenham and electrician N22.
Houses cut into flats on one intake. One supply, split at some point in the 1970s or 80s, sub-mains in twin-and-earth up the common stair, and a main earth that only ever got sorted for whichever flat was being worked on. The other flats share a terminal that may not be connected to anything.
Meter moves to an external box. Very common on the A406 and Watford Way frontages. The meter goes outside, the tails get extended, the bonding does not follow, and sometimes the earthing conductor is left behind in the old cupboard. We see it a lot in Mill Hill and Friern Barnet and New Southgate.
Damp meter cupboards. Corroded clamps and green-powdered conductors in brick cupboards on the north and east sides of houses, and in the communal intake rooms of ex-council blocks. The conductor is present; the connection has rotted off.

If you are a landlord, this is the finding most likely to turn a routine renewal into a remedial job with a clock on it. Our landlord EICR and HMO EICR pages cover the duties, and PAT testing is the related check people ask about in the same breath — worth knowing it is a separate regime from the EICR, not part of it. For where we work, see our London service areas; for everything else we have written up, the electrical guides index.

Frequently asked questions

Can I still use the electrics if there is no main earth?

If it has been coded C1, treat it as live danger. In practice we would isolate anything feeding exposed metalwork — immersion heaters, electric showers, outside sockets, metal-clad switches, anything in a bathroom or kitchen — and leave the rest on only if the inspector is satisfied it is safe to do so until the repair. Do not run extension leads from a neighbour, and do not assume that because nothing has happened in twenty years nothing will happen this week.

My earth clamp is on the water pipe. Isn’t that how it used to be done?

It is, and up until the 1960s it was normal practice. It is no longer an acceptable means of earthing under BS 7671 — a metallic water utility pipe cannot be used as the installation’s earth electrode, because the water company can replace any length of it in plastic at any time without telling anyone, which is exactly what has happened on most London streets. The clamp on your water pipe today should be a bonding conductor, which does a different job: it keeps the pipework at the same potential as everything else. Bonding is not earthing. Having the first does not give you the second.

Does a new fuse board fix no main earth?

No. A board change gives you RCD and RCBO protection and a modern enclosure, all of which is worth having, but it does not create an earth. The earth comes either from the network’s terminal at your cut-out or from an electrode in your ground. In most of these jobs we do both at once, which is why the earthing and bonding line in the table above is £108 when it runs alongside a board change rather than a separate visit.

How long does it take to put right?

If the network can provide an earth terminal and the intake is accessible, the electrical work is half a day. The variable is UK Power Networks’ visit, which is booked, not immediate. A TT conversion is a day, sometimes a day and a half if the board is going too and the ground is difficult to get a rod into — which it can be in a paved-over London front garden. We will tell you which of the two you are looking at before we quote, not after.

I’m buying the house and this came up on the survey. Who pays?

That is a negotiation, not an electrical question, but the numbers in the table above are the ones to take into it, and we are happy to put a written quote in front of a solicitor. What we would not do is let it go through unfixed on the basis that it has been like that for years. It is also worth getting the full EICR rather than relying on a surveyor’s note — a survey flags it, an EICR tells you whether the rest of the installation has the same history. See what an EICR checks.

Will my insurer care?

Most domestic policies do not ask for an EICR, so there is usually nothing to declare. The point at which it bites is a claim after a fire or a shock, where the question becomes whether you knew. Once a C1 is in writing with your name on the report, you knew. That is the honest answer, and it is the reason we do not like leaving these open.

Get the earthing checked properly

If a report, a surveyor, a meter fitter or another electrician has told you there is no main earth, the first thing worth paying for is an hour of someone opening the intake and telling you which of the five situations above you are actually in — because the fix ranges from £180 to a TT conversion, and guessing from the kerb helps nobody.

Call 07407 627542 or 07500 721453, or email info@faelectrical.co.uk. NICEIC Approved, Part P registered, working to the current edition of BS 7671, £5m public liability, City & Guilds Level 3. Checkatrade rated 9.32/10 from 242 reviews. Same-day where we have a slot — and we say so when we haven’t. Based in Tottenham N15, covering Haringey, Hackney, Islington, Enfield, Waltham Forest, Camden, Barnet, Newham and Tower Hamlets.

No Main Earth — What Does It Mean on an EICR?