The Compliance Quarter: Amendment 4, EICR and the 15 October Line

In August I wrote about the four forces repricing electrical businesses this year: infrastructure demand, the electrification funding reset, the tax changes and the skills gap. Those are the market conditions. This month I want to look at the layer underneath all of them, the one that turns demand into the kind of income a buyer will actually pay for. That layer is compliance, and this autumn it is unusually busy.

September is when the trade comes back from the quiet weeks and the year's compliance work gets committed. It is also the month before a hard date. On 15 October the version of the wiring regulations most firms have worked to for years is withdrawn, and Amendment 4 becomes the standard everyone is measured against. Set that alongside a building wave of EICR re-inspections and you have a quarter where certification currency, not order-book size, is doing the most to separate a strong business from an average one. This briefing walks through what that means for value, and every figure here comes from the body that published it.

Force OneThe 15 October Line: Amendment 4 and Current Competence

The IET and BSI published Amendment 4 to BS 7671:2018, the Wiring Regulations, on 15 April 2026. Contractors have been able to work to it since then, and the previous version is withdrawn on 15 October, closing a six-month transition. From that date, Amendment 4, nicknamed the Orange Book, is the definitive standard for compliant work in the UK.

One point is worth stating plainly, because it gets muddled in trade chatter: this is an amendment to the 18th Edition, not a new edition. There is no 19th Edition. What Amendment 4 does is update the standard in areas that have grown quickly, including stationary battery storage, Power over Ethernet and medical locations. The headline for owners is not the technical detail. It is what a re-assessed, currently competent workforce is worth to a buyer.

A withdrawal date does not change what good electricians already do. It changes how easily a buyer can prove your business is doing it.

Think about it from the far side of a sale. A buyer inheriting your business inherits its compliance risk. A team whose competence is visibly current against the standard of the day is a team the buyer does not have to re-train, re-certify or worry about. A business still leaning on the withdrawn version after October, by contrast, hands the buyer a job to do and a reason to chip the price. The 15 October line is really a line between two kinds of seller: the one whose currency is evidenced, and the one who will be asked to evidence it under pressure in diligence.

This is why scheme registration matters more than it looks. A NICEIC Approved Contractor is assessed every year, with work inspected, qualifications checked and insurance verified against BS 7671, now including Amendment 4. That annual assessment is, in effect, a third party continually restating that your business is current. To an acquirer, it is one of the cheapest and most credible pieces of assurance in the whole file.

There is a practical timing point in this for owners, and September is the right month to act on it. The six-month transition means both versions of the standard are live until 15 October, so an owner who gets training records, competence evidence and registration paperwork straightened out now walks into the autumn with the currency already banked rather than scrambling for it later. If a sale is anywhere on your horizon, the withdrawal date is a natural prompt to make sure the evidence a buyer will ask for is already in a folder rather than in your head.

Force TwoThe Renewal Wave: EICR Demand Is Compounding

The second force is quieter than a fixed date but arguably more valuable, because it is recurring. Private landlords have needed a five-yearly Electrical Installation Condition Report, an EICR, on their rented homes since 2020. That obligation is now being extended into the social rented sector, with new-tenancy rules from late 2025 and existing tenancies rolling out across 2026. Social landlords also face in-service inspection and testing of the electrical equipment they supply.

Two things are happening at once, and together they compound. New building stock is being pulled into the five-yearly regime for the first time, and a large tranche of the certificates issued when the rules first landed in 2020 is now reaching its five-year expiry, driving a wave of re-inspection. The regulator has also sharpened the incentive to comply: penalties for electrical-safety breaches in the rented sector have risen, and social housing carries tight remedial-works windows. None of that is a one-off surge. It is a widening, non-discretionary base of contracted testing work.

It is worth being precise about why the social-housing extension matters commercially rather than just as a rule change. It pulls a large, previously lighter-regulated tranche of housing stock into the same five-yearly framework that private landlords have lived with since 2020, and it adds in-service inspection of landlord-supplied equipment on top. For a firm holding those contracts, that is a base of work that does not flex with the economy or the weather. Tenants still need safe electrics in a downturn, and the inspections still fall due on their five-year clock regardless of what the order book is doing that quarter.

The point for a seller is not that testing is busy. It is that this particular demand is written into regulation on a five-year clock, which is exactly the shape of income a buyer underwrites. A charge point comes and goes with a grant. An EICR contract comes back every five years by law, and the book grows as more stock enters the regime. That recurring, compounding quality is what lifts a testing-heavy business above a project-led one in a buyer's model.

Force ThreeWhat Anchors the Multiple: Reading the Ladder Against the Catalysts

It helps to ground this in the numbers electrical businesses actually change hands for. On the sector's own published ranges, a mixed installation and testing firm, NICEIC or NAPIT registered with moderate recurring revenue, tends to trade at around 3x to 5x EBITDA. A specialist testing and inspection business with framework positions and a retained qualified team sits closer to 4.1x to 4.6x. And an operator with more than half its revenue in testing, established framework positions, NICEIC registration, ISO certification and a team of thirty or more qualified engineers reaches 5x to 7x.

Read that ladder next to the two forces above and the mechanism is clear. Amendment 4 and the EICR renewal wave are not abstract compliance news; they are what moves a business up the rungs. The more of your revenue that sits in contracted, certificated, recurring testing, the higher the ladder you climb, because that is the income a buyer can see continuing after completion. The catalysts are handing owners a structural reason to grow exactly the revenue that anchors the multiple.

Two businesses with identical turnover can sit two rungs apart on the ladder. The gap is not size. It is how much of the income recurs and how well it is certificated.

It also helps to see the scale of the field you would be selling into. There are more than 205,000 active electrical companies on the Companies House register, and on the sector's own analysis roughly 19,180 of them look exit-ready: a sole director, aged over 55, trading ten years or more. That is a lot of businesses that will come to market over the coming decade, and a buyer with choice pays for the ones that stand out. In a crowded field, a documented testing book and current certification are not just compliance housekeeping; they are how you make a buyer look at your business rather than the one next to it.

Those ranges are market observations, not a promise for your own business, and where any business lands is driven far more by revenue quality and workforce than by anyone's negotiating skill in the room. But they show why the compliance quarter matters commercially. The regulatory calendar is, in effect, subsidising the growth of the highest-quality revenue line an electrical business can hold. An owner who leans into it over the next year or two is building the part of the business that sells best.

Force FourThe Diligence Bundle: Three Documents Read Together

When a serious buyer looks at an electrical business, they do not weigh compliance items one at a time. They read them as a bundle, because together they tell a story about risk that no single document tells alone.

The bundle has three parts. First, current wiring-regs competence: evidence that your team is working to Amendment 4 rather than the withdrawn standard. Second, live scheme registration, typically NICEIC or NAPIT, with the annual assessment history that proves it has been maintained rather than allowed to lapse. Third, the EICR and fixed-wire testing book: the contracts, the renewal dates, the recurring income they represent. Each is easy for a buyer's advisers to verify, and hard for a seller to conjure at short notice.

What makes this a bundle rather than a checklist is how the parts reinforce each other. Current competence without a testing book is a compliant business with thin recurring income. A testing book without current competence is recurring income sitting on a compliance risk the buyer will have to fix. All three current, evidenced and consistent, and the buyer is looking at a low-risk business whose income they can model with confidence. That combination is what supports the offer, and its absence is what invites the deductions.

The practical work sits in the twelve to twenty-four months before a sale, which is why September is a sensible month to start. Get the workforce demonstrably current against Amendment 4 before and after the October line. Keep every registration and annual assessment in order and filed where it can be produced in a day. And treat the EICR book as an asset to be documented, not just a schedule to be worked: contracts, renewal dates and coverage set out clearly. None of it is glamorous. All of it reads straight through to the number a buyer is willing to write.

Pulling It TogetherWhy the Compliance Quarter Matters to Your Timing

Set the four forces side by side and the autumn picture comes into focus. Amendment 4 draws a line on 15 October between evidenced currency and a job left for the buyer. The EICR renewal wave is widening a base of contracted, five-yearly testing income that acquirers prize. The valuation ladder shows exactly how that recurring income lifts a business from one rung to the next. And a buyer's diligence team reads competence, registration and the testing book as a single bundle that either supports the price or erodes it.

It is worth remembering who is doing the buying, because it confirms the direction. Through 2026, compliance-led groups have been acquiring testing and inspection capability rather than building it: PTSG added Testing Services (UK) in March and BDS Group in May, Triton-backed OCU Group bought power-systems firm Athena PTS in May, and an active certification consolidator has been closing deals every few weeks. When the market pays to acquire certificated recurring work, the owners who hold it are the ones being competed for.

None of this says you should sell this autumn. It says the compliance quarter is quietly building the most valuable thing your business can own, and that the preparation is the same whether you act this year or in three: deepen the testing and inspection book, keep every registration and competence current through the October line, and document the bundle so it can be read in an afternoon. Options are the one thing you cannot assemble in a hurry once a buyer is at the table, and a clean compliance file is where they start.