The SIA Approved Contractor Scheme (ACS) is the voluntary accreditation programme that identifies security businesses meeting the Security Industry Authority’s standards for quality and compliance. For UK security companies, ACS accreditation is increasingly a commercial necessity: many public sector contracts, large corporates, and event venues will only work with ACS-accredited providers.
Yet the accreditation process is often described as daunting — particularly for smaller operators who lack in-house compliance resource. This guide explains what ACS accreditation involves, how the assessment works, and what operational changes typically make the biggest difference to your score.
What Is ACS Accreditation?
The Approved Contractor Scheme was established by the SIA in 2006 to raise standards across the private security industry. Participation is voluntary, but accredited contractors appear on the SIA’s public register of approved companies — a searchable list that procurement teams use when sourcing security providers.
ACS is a performance-based scheme. Companies are assessed against a set of criteria covering governance, compliance, HR management, service delivery, and continuous improvement. Each criterion carries a numerical score, and companies must achieve a minimum pass mark to gain and retain accreditation. There is no single pass/fail threshold — the scheme is designed to reward continuous improvement, with higher scores distinguishing better-performing businesses.
Who Needs ACS Accreditation?
Formally, ACS is voluntary. Practically, it has become close to mandatory in several market segments:
- Public sector contracts: Central government departments, NHS trusts, and local authorities routinely include ACS accreditation as a pre-qualification requirement.
- Large retail and logistics: Major retailers and logistics operators increasingly require ACS as part of their supply chain standards.
- Events and venues: Stadium and venue operators running licensed events may require ACS for guarding and door supervision contractors.
- Insurance: Some commercial insurers offer preferential premiums to ACS-accredited security companies.
If your business is targeting any of these market segments — or planning to — ACS accreditation should be a strategic priority, not an afterthought.
The ACS Assessment Process
The ACS assessment is carried out by an SIA-approved certification body, not the SIA directly. There are several approved bodies; costs and service levels vary but the assessment framework is standardised.
The assessment covers four primary areas:
- Leadership and governance — How the business is managed, how risks are identified and controlled, how objectives are set and reviewed.
- HR management — Recruitment and vetting processes, training and development, performance management, and employee welfare.
- Service delivery — How contracts are set up and managed, how operational performance is monitored, and how incidents are handled and reported.
- Continuous improvement — Whether the business has processes in place to identify and act on opportunities to improve.
Each area is broken down into individual criteria. Assessors review your documented policies and procedures, interview management and operational staff, and inspect records to verify that your stated processes actually happen in practice.
Common Preparation Challenges
Based on what security companies typically encounter when preparing for ACS assessment, the following areas are where preparation most commonly falls short:
Licence management documentation
Assessors want to see evidence that your company checks guard licences regularly — not just at onboarding. If your only evidence is a spreadsheet with a column for “licence expiry date,” you are unlikely to score well. Automated licence checking with logged verification records is significantly stronger evidence.
Incident reporting consistency
ACS assessors will sample incident reports. If reports are patchy, inconsistently formatted, or stored in different places (some in email, some on paper, some in a shared drive), this creates compliance risk. A centralised, structured incident reporting system with searchable records is what assessors want to see.
Training record completeness
Every guard’s training history should be documented and accessible. This includes initial SIA licence training, first aid certifications, site-specific inductions, and any additional qualifications. Gaps in training records are a common failure point.
Patrol and attendance evidence
For guarding contracts that include patrol requirements, assessors may ask to see evidence that patrols were completed as specified in contract. GPS-logged patrol data with checkpoint timestamps is far more compelling than a paper patrol log filled in at the end of a shift.
How Technology Supports ACS Compliance
A significant portion of what ACS assessors look for is evidence — documented proof that your processes work as described. Guard management software can generate this evidence automatically, across several criteria:
- Licence verification logs: Automatic daily SIA register checks with timestamped results create an auditable history of licence verification without any manual effort.
- Incident report archives: Structured, searchable incident records stored centrally provide instant access to historical reports during an assessment.
- GPS attendance records: Clock-in/out data with GPS coordinates demonstrates that guards were present at sites at the times recorded.
- Patrol completion records: NFC or QR checkpoint data proves that patrol routes were completed at the specified times.
- Training record management: Centralised employee records with training history, certification uploads, and expiry tracking.
The operational data your business generates day-to-day becomes your compliance evidence — provided it is captured and stored in a system that can surface it when needed.
Maintaining Accreditation
ACS accreditation is not a one-time achievement. Annual reassessment is required to maintain accredited status. The ongoing assessment cycle means compliance cannot be a project that happens in the months before an audit — it needs to be embedded in daily operations.
This is where the investment in proper systems pays off: businesses that have automated their compliance processes spend less time preparing for reassessment because their records are always current and always accessible.
Summary
ACS accreditation is increasingly essential for UK security companies competing for public sector and corporate contracts. The assessment framework is rigorous but predictable: document your processes, operate them consistently, and build the evidence trail automatically rather than retrospectively. Guard management software with ACS compliance functionality can dramatically reduce the operational burden of maintaining accredited status year after year.
TacDesk includes an ACS compliance module designed to support UK security companies through accreditation and ongoing reassessment. If you are preparing for your first ACS assessment or looking to improve your score at renewal, get in touch or explore our features.