When comparing quotes for an intruder alarm or monitored CCTV system, you will often see installers describe themselves as “NSI approved” or “SSAIB certified” without much explanation of what that means in practice. These are the two UKAS-accredited certification bodies that insurers, police forces and monitoring centres in the UK actually recognise, and the distinction between a certified installer and an uncertified one affects far more than just a badge on a quote.
Why third-party certification exists at all
Anyone can install a burglar alarm, and there is no legal requirement in the UK to use a certificated company for a domestic system that is not connected to police response. What NSI and SSAIB certification actually provides is an independent, ongoing check that a company continues to meet a recognised technical and quality standard after the sale, rather than a one-off claim made in an advert. This matters in a sector where a homeowner has limited ability to judge installation quality themselves, and where a poorly wired or badly specified system can fail exactly when it is needed, without the fault being obvious until then.
What NSI certification covers
The National Security Inspectorate certifies companies across intruder and hold-up alarm systems tested against PD6662 and BS 8243, CCTV design, installation and maintenance, access control, fire detection and alarm systems under BS 5839-1, and security screening of personnel under BS 7858. Certified companies are audited independently and regularly, not just at initial sign-up, with NSI stating it carries out several thousand audits a year across its approved company base. Certification also requires the company to operate a formal quality management system and to security-screen directors, which is intended to filter out companies that might otherwise disappear after taking a deposit or fail to maintain a system once installed.
What SSAIB certification covers
The Security Systems and Alarms Inspection Board certifies broadly the same range of services: intruder alarms, fire detection and alarm systems, CCTV, access control, key holding and door supervision, for both residential and commercial installers. SSAIB and NSI are competing certification bodies rather than a hierarchy, meaning a company certified by either one has been through an equivalent independent audit process; neither is a lesser or junior standard to the other. Most insurers and monitoring centres that specify “third-party certified” installation accept either body’s approval interchangeably.
Why this matters for monitored alarms specifically
The certification distinction becomes practically important the moment an alarm needs to be monitored by a police-response-linked Alarm Receiving Centre, because ARCs generally will not accept signals from a system installed by an uncertified company, regardless of how good the hardware is. This is the mechanism, more than any marketing claim, that makes NSI or SSAIB certification worth checking before booking an installer if you want the option of a monitored, police-linked response in future, even if you start with a self-monitored system.
Certification also matters for insurance. Some insurers offer premium discounts specifically for NSI or SSAIB certified installations, and high-value contents policies occasionally require it as a condition of cover for a monitored alarm rather than simply recommending it. As with lock standards, this is a detail worth confirming directly with your insurer rather than assuming any alarm company’s marketing claim satisfies the policy wording.
How to check before booking
Both NSI and SSAIB publish searchable directories of currently certified companies on their websites, and it is worth checking a specific installer against the live list rather than trusting a logo on a van or quote, since certification can lapse or be limited to certain services. Ask specifically which standard the quoted installation will be certified to, since a company can hold general NSI or SSAIB membership while quoting a job that will not actually be certificated, particularly for smaller residential jobs quoted informally.
Questions worth asking before you sign a contract
Beyond confirming certification status, ask whether the quoted price includes the annual maintenance visit that both NSI and SSAIB require of certificated installations, since an alarm that is installed to standard but never serviced can lose its certification status over time, which in turn can affect whether an Alarm Receiving Centre will keep accepting its signals. Ask who the signal is monitored by if you are choosing a monitored system, because the installer and the monitoring centre are not always the same company, and the monitoring centre itself should also be independently certified, typically to BS 5979 for an Alarm Receiving Centre. It is also worth asking what happens to false alarm handling, since police forces in England and Wales operate an Unique Reference Number system that can downgrade or withdraw police response to a specific alarm after repeated false activations, and a properly certified installer should be able to explain how the system is configured to minimise that risk.
Finally, get the certification claim in writing on the quote or contract itself rather than relying on a verbal assurance, since this is the document you would need if a dispute arose later about whether the installation actually met the standard it was sold on.