Alarm Signalling and the Migration From Analogue Lines

The analogue network is going, and the date is published

The public switched telephone network is being withdrawn at the end of January 2027. That is a fixed programme rather than a proposal, and it applies to every service that depends on an analogue line, which in this trade means intruder alarm signalling, some fire signalling, lift lines, and a quantity of legacy CCTV that nobody has looked at in years.

The risk is the part worth stating plainly, because it is what makes this different from other regulatory deadlines. GOV.UK lists alarm systems among the devices that rely on the old network and need upgrading, and an alarm that cannot signal is an account that is not being monitored, however normal the panel looks on site.

For an owner that means the migration is not only a technical programme but a liability question. An account monitored on paper and unmonitored in practice sits in a contractual position no security business wants to be in, and the position gets worse the closer the withdrawal date comes.

For a seller it means something more immediate. Buyers are already asking about signalling status, because they are pricing an installed base whose condition cannot be read off a revenue figure. The question sits in the same part of diligence, the buyer's detailed checks, as certification and vetting: not a matter of judgement, a matter of records, and the owner either has them or is about to spend three weeks building them while somebody waits.

What migration does to the quality of a monitoring base

A monitoring book signalling over IP or cellular paths is a different asset from one signalling over analogue lines, even where the monthly revenue is identical. The first is a base that will still be producing income in 2028 without further intervention. The second is a base carrying an unfunded programme of site visits, equipment and client conversations, all of which have to happen by a date somebody else has chosen.

The economics run both ways, which is why this is worth attention rather than alarm. Migration is chargeable work, and for many firms it has become a route to upgrading an ageing base, raising monthly charges that have not moved in years, and putting accounts onto proper contracts rather than rolling arrangements. A book that comes out of the programme migrated, re-contracted and re-priced is worth materially more than it was going in.

The firms that will struggle are the ones that leave it late. Installer capacity is finite, and every security business in the country is drawing on the same pool of engineers and the same equipment supply against the same date. Work scheduled calmly across several years costs less than the same work compressed into the last few months.

There is a middle case worth naming as well. Plenty of books are partly migrated, with the newer accounts on digital paths and a tail of older sites nobody has revisited. That tail is exactly what a buyer will quantify, and an owner who has not quantified it first is negotiating from a weaker position than the business deserves.

An alarm that cannot signal is an account that is not being monitored, however normal the panel looks.

Why signalling status is now a diligence question

The question a buyer asks is simple and specific: how many of your monitored accounts are still on analogue signalling, and what will it cost to move them. An owner who can answer with a schedule is describing a manageable programme. An owner who cannot is inviting the buyer to estimate, and buyers estimate conservatively when they are the ones carrying the risk.

The answer has three parts. The count of accounts by signalling type, the cost per site to migrate including the engineering visit, and the position on who pays. That third part is the one owners most often leave open, and it is the one that decides whether the programme is a cost or an opportunity.

None of this needs to be finished before a sale. It needs to be known. A partly migrated book with a costed plan and a client communication already under way reads as a business in control of a known change. The same book with no schedule reads as an unpriced liability, and the discount applied to an unpriced liability is always larger than the liability. That asymmetry is worth sitting with, because it is the reason preparation pays in this sector generally: a buyer prices what it can see and reserves against what it cannot, and the reserve is never generous.

One more point. Owners frequently assume the migration is a problem for the client to solve, since the line belongs to the client and the telephone provider is the one withdrawing it. Contractually that is often true and commercially it is beside the point. The client whose alarm went silent will remember which company monitored it, and so will the buyer reading the complaint file two years later.

In the years before a sale, Martin Dugan helps owners win more of the recurring, contracted work buyers pay for.