How NSI Gold and SSAIB Accreditation Affect Your Valuation

When buyers assess a UK security business, accreditation is one of the first things they look at, and one of the most consistent influences on what they are willing to pay. It tells them, quickly and credibly, that the business operates to recognised standards, can win the contracts it claims to win, and will not spring compliance surprises after completion.

For electronic security and alarm businesses, the central marks are NSI Gold and SSAIB. For the people side of the industry, the SIA Approved Contractor Scheme and BS 7858 vetting carry the same weight. This article explains what each one signals to a buyer and why an accredited business is a cleaner, higher-value acquisition.

NSI Gold and the NACOSS Gold Legacy

The National Security Inspectorate's NSI Gold approval, which absorbed the long-established NACOSS Gold, is the most widely recognised certification for alarm and electronic security installers in the UK. It certifies both the company's quality management and its technical compliance with the relevant standards, and it is the mark insurers and police forces most readily accept. To a buyer, NSI Gold is shorthand for a business that has already done the hard, multi-year work of building a compliant operation.

SSAIB as the Recognised Alternative

SSAIB is the other UKAS-accredited certification body for security and fire systems installers, and it is recognised by police and insurers in the same way. For valuation purposes, what matters is not which body you hold but that you hold current certification with one of them. A business certified to NSI Gold or SSAIB is treated very differently from an unaccredited operator, because the certification underpins insurance acceptance, police response eligibility, and tender access.

The SIA Approved Contractor Scheme

For manned guarding and licensed security services, the SIA Approved Contractor Scheme is the equivalent quality benchmark. The SIA itself licenses individual operatives, and there are more than 500,000 active SIA licences in issue, held by around 459,000 individuals (GOV.UK, 2025). The Approved Contractor Scheme sits above that, certifying the business rather than the person, and it is frequently a prerequisite in public sector and corporate tenders. A guarding business without it is shut out of a meaningful share of the market.

BS 7858 and the EN Standards

BS 7858 is the standard for security screening and vetting of staff working in secure environments. A business that vets to BS 7858 can demonstrate that its people have been properly screened, which matters enormously to corporate and public sector clients. Alongside it sit the European product and operating standards: EN 50131 for intruder and hold-up alarm systems, EN 50132 for CCTV and video surveillance, EN 50136 for alarm transmission, and EN 50518 for monitoring and alarm receiving centres. Together they define what a compliant, monitored system and a compliant monitoring centre actually look like.

How Accreditation Shows Up in the Offer

Buyers price accreditation heavily because it underpins three things at once: tender eligibility, insurance acceptance, and self-certification. A security business holding current Approved Contractor status plus NSI Gold or SSAIB, vetting to BS 7858 and operating to the relevant EN standards, is a lower-risk acquisition. The earnings are more defensible because the contracts that produce them depend on certifications the business already holds.

The reverse is also true. Where a business is unaccredited, or lets a certification lapse, buyers typically apply a discount to cover the cost, the time, and the contract risk of re-certifying. In some cases the absence of the right mark removes a buyer from the process altogether, because they cannot inherit contracts that require certification the target does not hold. A smaller pool of buyers almost always means a softer price.

Protecting Accreditation Through a Sale

Accreditation is also something to protect during the sale itself. Certifications attach to the business and its processes, so a buyer will want to confirm they transfer cleanly and that the responsible qualified staff are staying or being replaced in an orderly way. Part of a well-run process is making sure the certification position is documented clearly up front, so it becomes a point of confidence rather than a question raised late in due diligence.

If you are a year or two from selling and hold strong certifications, that is a genuine asset to build the sale around. If a certification has lapsed or is held only by a departing member of staff, that is worth addressing before going to market. A short, confidential conversation is the best way to work out where you stand and what, if anything, is worth tidying first.