What Is the SIA Approved Contractor Scheme?
The SIA Approved Contractor Scheme (ACS) is a voluntary accreditation programme run by the Security Industry Authority. It is the recognised quality benchmark for private security companies operating in the United Kingdom. Companies that achieve ACS accreditation have demonstrated that their management practices, operational procedures, and compliance processes meet a defined standard that goes beyond the basic legal requirement to use licenced operatives.
ACS is open to any company whose primary business involves providing security services to third parties. This includes guarding companies, door supervision businesses, CCTV monitoring centres, and close protection providers.
Why Does ACS Accreditation Matter?
For many buyers of security services, ACS accreditation is not a differentiator — it is a requirement. Public sector procurement frameworks, NHS contracts, and many large corporate security tenders specify ACS accreditation as a minimum eligibility criterion. Without it, you may be excluded from significant contract opportunities regardless of your operational capability.
Beyond procurement, ACS accreditation offers genuine commercial benefits:
- Competitive differentiation. ACS status signals to clients that your company has been independently assessed against a recognised standard. In a market where price is often the dominant factor, a credible quality signal can justify higher rates.
- Operational improvement. The ACS assessment process identifies gaps in your management systems and processes. Companies that prepare thoroughly for ACS often emerge with significantly improved internal procedures, regardless of the outcome.
- Reduced regulatory risk. The compliance focus of ACS assessment encourages companies to build robust SIA licence management, documentation, and training processes — reducing the risk of enforcement action.
- Staff development. ACS assessors look at training, supervision, and career development practices. Companies that invest in staff development tend to see lower turnover — a major cost driver in the security industry.
How Is ACS Performance Measured?
ACS uses a points-based scoring system. Companies are assessed against criteria across five key areas:
1. Management and Business Practices
Assessors examine your business planning, financial management, risk management, and organisational structure. Evidence of structured management processes — documented policies, regular management reviews, and clear accountability — is required.
2. Staffing
This covers recruitment, vetting, induction, and ongoing training. You must be able to demonstrate that your hiring practices meet the SIA’s vetting standards, that new operatives are properly inducted, and that your workforce is appropriately trained for the roles they perform.
3. Key Outcome: Service Delivery to Customers
How do you ensure that the service your clients are promised is the service they actually receive? Assessors will look at your contract management processes, client communication practices, and how you handle complaints and service failures.
4. Key Outcome: Management of Assignments
This area covers your operational management systems — how you schedule operatives, manage deployments, supervise sites, and handle incidents. Documented procedures and evidence of consistent application are critical here.
5. Key Outcome: Health, Safety and Welfare
Security operatives are exposed to elevated risk in their work. Assessors will examine your health and safety policies, lone worker procedures, incident recording, and how you manage the welfare of your workforce.
Companies must achieve a minimum score to pass. The SIA publishes the ACS scorecard, so you can review the assessment criteria in detail before engaging an assessor.
Who Conducts ACS Assessments?
Assessments are carried out by SIA-approved certification bodies, which are independent organisations accredited by the United Kingdom Accreditation Service (UKAS). You choose your own certification body — different bodies have different pricing structures and assessment approaches, so it is worth obtaining quotes from two or three before committing.
The assessment typically includes a desk review of your documentation followed by an on-site visit. Assessors may interview staff at all levels of your organisation, review operational records, and inspect site documentation.
How to Prepare for ACS Accreditation
Step 1: Conduct a Gap Analysis
Before engaging a certification body, conduct an honest internal assessment against the ACS criteria. Where are your documented procedures strong? Where are the gaps? Identify the areas that require the most preparation and prioritise accordingly.
Step 2: Document Your Processes
ACS assessors need evidence, not assertions. If your company has always done something in a particular way, document it. Create or update policies for recruitment and vetting, induction training, site supervision, incident management, health and safety, and client communication.
Step 3: Ensure SIA Licence Compliance
No company will pass an ACS assessment if it has operatives in licensable roles without valid SIA licences. Before applying for assessment, verify that every operative’s licence is current and appropriate for the role they perform. Implement a system for ongoing licence monitoring so that no licences lapse undetected.
Step 4: Establish Operational Records
The ACS assessment criteria place significant weight on operational evidence — patrol records, incident reports, check call logs, supervision records, and training logs. If you do not have consistent operational records, begin building them before your assessment. Digital record-keeping systems make this significantly easier than paper-based approaches.
Step 5: Engage a Certification Body
Once your gap analysis is complete and your documentation is in order, contact one or more SIA-approved certification bodies. Most offer a pre-assessment consultation that can help you identify remaining gaps before the formal assessment takes place.
Maintaining ACS Status
ACS accreditation is not a one-time achievement. Accredited companies are subject to ongoing surveillance assessments, and full reassessment is required periodically. Maintaining ACS status requires that the standards achieved at assessment are embedded in daily operations — not applied temporarily for assessment purposes and then abandoned.
The companies that find ACS maintenance straightforward are those that have genuinely integrated compliance and quality practices into their operational workflow. Those that treat ACS as a documentation exercise typically struggle to maintain standards between assessment cycles.
How TacDesk Supports ACS-Seeking Security Companies
TacDesk’s ACS compliance module is designed to support security companies through the documentation and record-keeping requirements of ACS accreditation. It provides:
- SIA Public Register auto-sync — continuous verification of operative licence status against the SIA register, with automatic alerts for expired or suspended licences
- Incident, patrol, and check call records — digital logs that create the operational evidence base ACS assessors will examine
- Vehicle defect reporting — auditable pre-use vehicle checks that support your health and safety obligations
- Management dashboard — real-time visibility across your operation, with exportable records for audit and client reporting purposes
For companies pursuing ACS for the first time, TacDesk can significantly reduce the effort required to build the operational evidence base that assessors expect. For accredited companies, it makes maintaining that evidence base a natural part of daily operations rather than a separate compliance task.
Is ACS Right for Your Company?
If your company is targeting public sector contracts, large corporate clients, or any procurement process that specifies ACS as a prerequisite, the answer is almost certainly yes. For smaller companies focused on local private clients, the commercial calculus is less clear-cut — though the operational improvements that come from preparing for ACS can benefit any security company regardless of size.
The SIA publishes a full list of ACS-accredited companies on its website, allowing procurement teams and clients to verify accreditation status directly.
Summary
- ACS is the SIA’s quality benchmark for UK security companies — voluntary but increasingly required for major contracts
- Assessment covers management, staffing, service delivery, assignment management, and health and safety
- Preparation requires documented processes, clean SIA licence records, and consistent operational documentation
- Maintaining ACS status requires embedding compliance into daily operations, not just at assessment time
- Guard management software can significantly reduce the evidence-gathering burden of both achieving and maintaining accreditation
If your company is working towards ACS accreditation and you’d like to see how TacDesk can support the process, get in touch or explore our compliance features.