Short answer: most ex-council flats in North London need a new consumer unit, not a full rewire — but the board is not what decides it. What decides it is whether every circuit has an earth, and what the insulation resistance test reads. A new board is roughly £550–£750. A flat rewire is £2,200–£6,000. The £170 test that tells you which one you need is the cheapest money you will spend on the flat, and it should come first.
We are F & A Electrical, an NICEIC-approved, Part P registered contractor based in Tottenham N15, and a large part of our week is spent on ex-council and ex-housing-association flats across Haringey, Hackney, Islington, Enfield, Waltham Forest, Camden and Barnet. This page explains how the decision is actually made, what it costs, and the two or three things about estate flats that stall the job if nobody checks them first. Call 07407 627542 or 07500 721453, or email info@faelectrical.co.uk.
Why is an ex-council flat a special case?
Because the wiring history is rarely the simple one. A privately owned Victorian conversion usually has one story: it was wired once, then added to. An ex-council flat typically has three layers on top of each other.
The first is the original installation, which tracks the build date. Interwar cottage estates — the Tower Gardens area of N17, the older parts of the Bemerton and White Hart Lane stock — were first wired with rubber-insulated cable, and anything still on that is finished. The big 1950s to 1970s blocks across Haringey, Hackney and Islington went in with early PVC twin and earth, often with no earth at all at the lighting points, and in some blocks with aluminium conductors rather than copper.
The second layer is the council or housing association’s own programme work. Between roughly 2001 and 2010, under the Decent Homes standard, a very large number of tenanted flats got a new consumer unit, a new kitchen, and new circuits serving the kitchen — and the lighting circuits and bedroom socket radials were frequently left exactly as they were. That is why so many estate flats have a modern-looking board sitting over wiring that is fifty years old.
The third layer is whatever the flat’s owners have done since. And here is the part that catches people out: if the flat was bought under Right to Buy before the programme reached that block, the internal works usually did not happen. The sold flats on an estate are quite often the ones still on the original wiring, while the tenanted flat next door was done in 2006.
So the age of the block tells you very little on its own. Two flats on the same landing can need two different jobs.
What actually decides it — board or rewire?
Five things, and all of them come out of an EICR or a pre-works test. None of them can be judged by looking at the front of the board.
1. Is there a circuit protective conductor on every circuit? This is the big one. Lighting circuits installed before the mid-1960s frequently have no earth run to the switch or the ceiling rose. You cannot retro-fit an earth into a cable that does not contain one, so if the lighting has no CPC, the lighting is being rewired whatever else happens. On a report, that is normally a C2 where there are metal switch plates or metal fittings on the circuit, and a C3 where everything on it is double-insulated — which is why the same finding can read as urgent in one flat and not in the next.
2. What does the insulation resistance test read? BS 7671 wants at least 1 MΩ on a 500 V test, and anything under 2 MΩ is treated as a circuit that needs investigating. Old rubber cable and cable that has cooked behind a storage heater both read low. A circuit down near the floor on insulation resistance will trip a new RCD the moment you energise it, so a low reading effectively rules out a straight board swap on that circuit.
3. What is the cable? Rubber or cloth-covered means a rewire. Early PVC in sound condition, with a CPC, is usually fine to keep — PVC does not have a fixed expiry date, it has a condition. Aluminium conductors are serviceable but the terminations work loose over time and need checking at every accessory, not just at the board.
4. What state are the tails, the main earth and the bonding in? In a lot of estate flats the main protective bonding to the water and gas services was never installed, or is 6 mm² where it should be 10 mm². That is a separate job from the board, it is often a C2, and it has to be sorted whichever route you take. It is £108 when we are doing it alongside other work.
5. Has the board got room? A six-way board in a flat that now has a shower, an induction hob and an EV charger on the way is a capacity problem, not a safety problem — but it changes which board goes in.
Does a missing RCD mean the flat fails its EICR?
Usually not, and this is worth saying plainly because it gets used to sell boards. On an existing installation, the absence of RCD protection on socket circuits is normally coded C3 — improvement recommended. A C3 does not make a report unsatisfactory. What makes it unsatisfactory is a C1, a C2 or an FI.
So an old board on its own rarely fails a flat. What fails it is what the old board is sitting on: no earth at the lights, low insulation resistance, missing bonding, a damaged cable buried in a wall with no protection. If your report came back unsatisfactory and someone has quoted you for a board change alone, ask which coded item the new board actually clears. Sometimes the honest answer is “none of them”.
What happens if you just fit a new board anyway?
A modern board protects every circuit with an RCD or RCBO, and that protection does its job — it finds the faults the old board was quietly tolerating. Borrowed neutrals between two lighting circuits, damp in an outside light, a failing immersion element, deteriorated insulation on a bedroom radial: all of it sat there harmlessly behind a rewireable fuse and all of it trips a new board.
That is why we test before we quote rather than after we have fitted. If the insulation resistance will not pass, we cannot issue a certificate for the board, and nobody wants to be the owner of a half-finished job and a flat with no lights. On a flat where the testing shows trouble, the sensible sequence is: make safe, price the circuits that need replacing, then fit the board last so it goes onto an installation that can live with it.
Who owns which bit of the electrics in an estate block?
This is the part that stalls more jobs on estates than any technical issue, and it is worth knowing before you book anything.
The service cable, the cut-out and the main fuse belong to UK Power Networks. The meter belongs to your supplier. Neither of those can be touched by us, and if the job needs the fuse pulled — which a lot of board changes do — that is a UKPN or supplier appointment with its own lead time.
The rising main, the landlord’s intake cupboard, the communal lighting and anything in the shared areas belong to the council or the housing association as freeholder. If your flat’s supply is fed from a landlord’s cupboard on the landing, work that touches that cupboard is their work, not yours, and it needs their consent and their contractor’s involvement. We have written up how that sign-off works in who signs off communal electrical work in a London block.
Everything from your meter tails inward is yours, and that is where a flat rewire or board change lives. But if you are a leaseholder, check the alterations clause in your lease before a rewire — most council and housing association leases require the landlord’s written consent for alterations to the installation, and getting it is a form and a wait rather than a fight. Letting agents handling an estate flat for a landlord should read who instructs and who signs, because the duty holder is the landlord, not the agent.
How much does each option cost?
Prices are labour and certification only, inclusive of VAT. Materials and accessories — the board itself, sockets, fittings — are itemised separately at cost. Our minimum charge is £108 inc VAT, one hour at the standard rate of £90 per hour plus VAT, and nothing is priced below it.
| Job | Price (inc VAT) |
|---|---|
| Minimum charge / small works visit (one hour) | £108 |
| Standard labour thereafter | £90 per hour + VAT |
| EICR — studio or 1-bed flat | £140 |
| EICR — 2-bed flat | £170 |
| EICR — 3-bed flat or maisonette | £200 |
| EICR — 4-bed house | £250 |
| EICR — licensed HMO | £250–£500 |
| Consumer unit replacement, 6-way | from £550 |
| Consumer unit replacement, 10-way | £650 |
| Consumer unit replacement, 12-way or more | £750 |
| Consumer unit + EICR, same visit | £690 |
| Earthing and main protective bonding upgrade alongside other work | £108 |
| Partial rewire — lighting circuits only, or one floor | £1,600–£3,000 |
| Full flat rewire — 1-bed | £2,200–£3,200 |
| Full flat rewire — 2-bed | £3,000–£4,500 |
| Full flat rewire — 3-bed or maisonette | £4,200–£6,000 |
| Out of hours — evenings, weekends, early access slots | £60 + VAT per half hour |
The gap between the two routes is wide enough that the test is worth doing properly. Fuller breakdowns are on fuse board replacement London, the cost to rewire a flat in London and EICR remedial work costs.
Is a partial rewire a reasonable middle route?
Often, yes — and on ex-council flats it is frequently the right answer rather than a compromise. The common shape is that the kitchen and the sockets were done under a programme and are sound, and the lighting is original with no earth. Rewiring the lighting circuits and leaving the rest, then fitting the new board, costs £1,600–£3,000 instead of £3,000–£4,500 and it puts the money where the actual defect is.
The honest caveat is that a partial rewire gives you an Electrical Installation Certificate for the new work only. The rest of the installation stays on whatever its condition report says. If you are selling, a buyer’s surveyor will read it that way too.
Concrete floors change the method rather than the price. In a block you usually cannot lift a floor to run cable, so circuits go in the ceiling void where there is one, in the existing conduit where the original installer left it accessible, or surface in trunking where there is no other route. That is normal for estate work and worth knowing before anyone promises you invisible cables.
Does this work need Building Control notification?
Yes, both routes do. A consumer unit replacement in a dwelling is notifiable under Part P, and so is a rewire. We are NICEIC registered, so we self-certify and notify Building Control ourselves — you get the certificate and the Building Regulations compliance notice, and there is no separate council fee and no application for you to make. Keep both documents with the flat’s paperwork; they are what a conveyancer asks for.
If a rewire triggers new smoke alarm work, the alarms go in hardwired and interlinked. For a rented flat there is a separate standing duty: at least one smoke alarm on every storey, and a carbon monoxide alarm in any room with a fixed combustion appliance — a boiler or a solid fuel heater. Gas cookers and hobs are excluded from that CO requirement, which is a detail a lot of checklists get wrong.
Ex-council flat fuse board or rewire — FAQs
The council rewired this block in 2007. Do I still need anything?
Possibly not, and that is a good starting point. But programme work was often partial, and twenty years have passed. An EICR on a 2-bed is £170 and either confirms the installation is sound or tells you exactly what is left over. If the lighting was not part of the programme, it will show up immediately.
My flat has a modern-looking board. Is it fine?
A modern board tells you about the board, not the cables. We see plastic dual-RCD boards from the mid-2000s sitting on original lighting circuits with no earth. The board was compliant when it went in; the installation behind it was never touched.
Can you do a board change in a day?
In a flat where the testing is clean, usually yes — allow a working day with the power off for most of it. Where the main fuse has to be pulled by UKPN or your supplier, the date depends on their appointment, not on us, and we will tell you that before you book rather than on the morning.
I am a leaseholder and the freeholder is the council. Do I need permission to rewire?
Check the alterations clause in your lease — most require the landlord’s written consent for work of that kind, and the flat side of the installation is yours to maintain. Anything in the communal riser or the landlord’s intake cupboard is theirs and cannot be done on your instruction.
I am letting the flat. Which do I need before the tenancy starts?
Legally, a satisfactory EICR no more than five years old, with a copy to the tenant within 28 days and any C1, C2 or FI items put right within 28 days of the report. That is the requirement — not a new board. Whether the remedials amount to a board change or a rewire is what the report decides. Licensed HMOs are a tighter regime: see HMO EICRs in London, and if the flat is furnished for a let, PAT testing.
Can you tell me over the phone?
We can narrow it down. A photo of the open board, a photo of a ceiling rose with the cover off, and the age of the block gets us most of the way to the right answer — and if your last EICR is to hand, send the PDF and we can price the remedials from it directly.
Book a test, then decide
Call 07407 627542 or 07500 721453, or email info@faelectrical.co.uk. Send a photo of the consumer unit or the EICR PDF and we can usually give you a price the same day. We are NICEIC approved, Part P registered, work to BS 7671 18th Edition and fully insured, and we are Checkatrade approved with a rating of 9.32 out of 10 from 242 reviews.
Related reading: 5 signs your fuse board needs replacing · consumer unit upgrade guide · communal electrical sign-off. Every guide we have written is indexed on our electrical guides hub, and the areas we cover are listed on London service areas.