How to Get ACS Certification in the UK

If you run a private security company in the UK, you have probably heard about the SIA Approved Contractor Scheme.

In 2026, ACS certification is one of the most important steps a security business can take. It sets you apart from the competition. It opens doors to public sector contracts. And it tells clients that your business has been independently assessed and meets recognised industry standards.

But how exactly do you get ACS certified? What does it involve? And how hard is it to pass?

This guide answers every question, from what ACS means to the step-by-step process, to how BizGrow Holdings helps UK security companies achieve approval with confidence.

Let us start from the beginning.

What Is ACS? (SIA Approved Contractor Scheme Explained)

ACS stands for the Approved Contractor Scheme. It is a quality assurance scheme for the UK private security industry, managed by the Security Industry Authority (SIA).

The SIA is the regulatory body for the private security sector in the UK, established under the Private Security Industry Act 2001. Its job is to license security operatives and raise standards across the industry.

The ACS was introduced as a voluntary scheme to do exactly that: raise the bar. It gives security companies a formal framework to demonstrate that they operate to the highest professional standards in terms of service delivery, staff management, quality control, and business ethics.

When a company achieves ACS approval, it is listed on the SIA’s public Register of Approved Contractors. That listing is visible to procurement teams, local authorities, and large businesses across the UK, and it is increasingly being used as a minimum standard for awarding security contracts.

What Does ACS Stand For in Security?

ACS stands for Approved Contractor Scheme.

In the security industry, the full name is the SIA Approved Contractor Scheme, where SIA stands for the Security Industry Authority.

You may also see it referred to as:

SIA ACS the most common shorthand
ACS approval the status a company holds once approved
ACS accreditation is sometimes used interchangeably with ACS certification
Approved Contractor status the formal designation given by the SIA

All of these terms refer to the same thing: formal recognition by the SIA that your security company meets the required performance standards across all key areas of business operation.

What Is the Purpose of ACS?

The purpose of ACS is straightforward: to raise standards across the UK private security industry.

Before the ACS existed, the quality of security services varied enormously. Some companies were excellent. Others were not. Clients had no reliable way to judge the difference, other than price and reputation.

The ACS changed that. It gives buyers of security services, including councils, NHS trusts, housing associations, construction firms, and large corporates, a reliable, independently verified signal that an ACS-approved company has met a recognised standard.

For the industry as a whole, the ACS serves several important purposes:

It sets a consistent benchmark that all approved companies are assessed against the same criteria
It promotes continuous improvement the assessment encourages businesses to review and improve their operations regularly
It protects the public by ensuring security operatives are properly licensed, trained, and managed
It supports the growth of ACS-approved companies by providing access to tender opportunities that are unavailable to non-approved firms.
It drives professionalism, it gives security businesses a framework to develop their management systems and service delivery.

The SIA describes the ACS as a tool to help security companies raise performance standards and develop new opportunities.’ In practice, that is exactly what it does.

What Does It Mean to Be ACS Certified?

Being ACS certified means your security company has been independently assessed and confirmed to meet the SIA’s Approved Contractor Scheme standard.

It is not a rubber stamp. The assessment is rigorous. It covers every aspect of how your business operates, from leadership and strategy to service delivery, staff management, and customer satisfaction.

When your company achieves ACS approval, several things happen:

You are listed on the SIA’s public Register of Approved Contractors, searchable by clients across the UK
You are authorised to use the official ACS accreditation mark on your website, vehicles, stationery, and marketing materials.
You gain access to tender opportunities that require ACS approval as a minimum standard
Your clients and prospects can verify your approval status directly through the SIA’s online register.
You are positioned as one of the UK’s best providers of private security services.

ACS approval is sector-specific. If your company provides security guarding, door supervision, and CCTV, you can apply for approval in all three. You must meet the standard in each sector you apply for, and you can expand your approval later if you add new services.

ACS approval is not a one-time achievement. You re-register with the SIA every year and undergo a full independent assessment every three years to maintain your approved status.

SIA ACS Requirements | What Do You Need?

Before you can apply for ACS, your business must meet the SIA’s eligibility criteria. These are the minimum conditions; if you do not meet them, your application will not proceed.

Basic Eligibility Requirements

You must supply security services within the United Kingdom
You must supply contracted security services; in-house providers cannot apply
You must have at least one active contract for supplying security services
You must have a minimum of 12 months’ history of supplying security services at the time of application
You must supply a minimum of two licensable operatives in each sector you are applying for
All directors must hold a valid SIA licence, including executive, non-executive, and shadow directors
All security operatives you deploy must hold a valid SIA licence

The SIA also conducts a ‘fit and proper’ assessment. This involves identity checks, criminality checks, financial probity checks, and an integrity assessment of the people who run your business, often referred to as the ‘controlling minds’.

Legal and Licensing Requirements

Every director in your company must hold a valid SIA licence. Every operative you deploy must be licensed. This is non-negotiable. The SIA will check licence validity as part of the application process.

Your business must comply with all relevant British Standards for the security sector, including:

BS 10800 the overarching standard for the provision of security services (mandatory for ACS)
BS 7499, if you provide static guarding and mobile patrol services
BS 7960, if you provide door supervision services
BS 7984, if you provide key holding and response services
BS 7858 covering the screening of staff

Quality Management

The ACS assessment is built around seven criteria, covering all aspects of how your business is run. These include strategy and leadership, service delivery, customer and supplier relationships, health and safety, people management, business results, and continuous improvement.

Having ISO 9001 certification or working towards it is a significant advantage. Meeting ISO 9001 requirements helps you satisfy around two-thirds of the ACS self-assessment workbook indicators, making the overall process considerably more straightforward.

Health and Safety Standards

Your business must demonstrate a clear commitment to health and safety. This includes a documented health and safety policy, risk assessments for all operational activities, and evidence that staff are properly trained and equipped.

Staff Welfare and Training

The ACS places strong emphasis on how you manage and support your staff. This includes fair pay, proper contracts, training records, SIA licence management, and clear procedures for handling staff welfare matters.

Business Practices and Ethics

Your business must be able to demonstrate ethical, transparent commercial practices, including clear contracts with clients, proper subcontractor management, and evidence of ongoing performance monitoring and client satisfaction measurement.

How to Get ACS Certification | Step by Step

There are two routes to ACS approval: the Standard Route and the Passport Route. The Standard Route is open to any qualifying security company. The Passport Route is available to companies that already hold certain recognised certifications, such as NSI Guarding Gold. For most businesses, the Standard Route is the path to follow.

Here is how the Standard Route works:

Step 1: Check Your Eligibility

Before anything else, confirm that your business meets all the basic eligibility requirements. Check that all directors hold valid SIA licences. Confirm you have 12 months of operating history. Make sure you have at least two licensed operatives in each sector you are applying for.

Do not skip this step. If you fail the SIA’s eligibility checks, your application will be rejected, and your fees will not be refunded.

Step 2: Complete the SIA ACS Register and Self-Assessment Workbook

Download the ACS Self-Assessment Workbook from the SIA’s website. This is a comprehensive document, currently 92 pages, that covers all seven criteria of the ACS standard. Work through it honestly and score your business against each indicator.

The workbook is not a pass/fail test. It helps you identify where your business currently stands and where you need to improve before applying. Take it seriously. Businesses that rush through the self-assessment and apply before they are ready waste time and money.

The SIA updated the workbook in 2025, with changes to criterion 6 (people). Always download the most current version from gov.uk before you start.

Step 3: Complete the Online Application and Pay the Fee

Once you are confident your business meets the required standard, complete the ACS application form through your SIA online business account. Senior decision-makers in your business must sign the declaration.

Submit the form along with the application fee. The SIA will then process your application and conduct its eligibility checks, including identity, criminality, financial probity, and integrity assessments for all directors.

Step 4: Prepare for the SIA ACS Audit

If the SIA confirms you are eligible, they will instruct you to arrange a verification visit with your chosen assessing body. Approved assessing bodies include NSI, SSAIB, and British Assessment Bureau, among others.

Before the visit, submit a copy of your completed Self-Assessment Workbook scores and supporting evidence to your assessing body. They will review this in advance of the visit.

This is where thorough preparation matters most. Your documentation, processes, policies, training records, and management systems will all be examined. Everything you have claimed in your self-assessment needs to be backed up by evidence.

Step 5: Work With an SIA ACS Consultant

Many security companies choose to work with an experienced ACS consultant before and during the application process. A good consultant helps you identify gaps in your current setup, develop the documentation and processes you need, prepare your self-assessment workbook accurately, and get your business genuinely audit-ready.

The SIA does not train, approve, or endorse specific consultants, and they make clear that consultants do not share responsibility for meeting ACS terms and conditions. That responsibility stays with your business. But working with the right expert significantly increases your chances of passing the first time.

At BizGrow Holdings, we provide exactly this kind of support. More on that below.

Step 6: The SIA ACS Assessor Review

Your chosen assessing body will send a qualified SIA ACS assessor to conduct the verification visit. The assessor reviews your self-assessment workbook scores, examines your evidence, speaks with your management team, and verifies that your business genuinely operates to the standard claimed.

The assessor then submits their report to the SIA. The SIA makes the final approval decision, not the assessing body.

Step 7: Receive Your ACS Approval

If the SIA is satisfied, they will grant ACS approval. You pay the registration fee, and your company is listed on the public Register of Approved Contractors. You can now use the ACS accreditation mark and begin marketing your approved status to clients.

If the assessment identifies areas that need improvement before approval can be granted, you will need to address these and go through the process again.

How Long Does ACS Certification Take?

The timeline for ACS certification varies depending on how prepared your business is when you start.

Self-assessment and preparation: 4 to 12 weeks, depending on the gaps in your current setup
SIA eligibility checks after application submission: typically 4 to 6 weeks
Assessing body verification visit scheduling: varies by provider, allow 2 to 4 weeks.
Assessor report submission and SIA decision: 2 to 4 weeks

In total, a well-prepared business can typically achieve ACS approval within 3 to 6 months of starting the process. Businesses that begin with significant gaps in their documentation, policies, or processes or that rush through the self-assessment without proper preparation, often take considerably longer.

Once approved, you re-register with the SIA annually and undergo a full reassessment every three years to maintain your status.

Is the SIA ACS Hard to Pass?

The honest answer is: it depends on how seriously you approach it.

The ACS assessment is not a simple tick-box exercise. The self-assessment workbook covers seven criteria and 89 individual indicators of achievement. The assessor will look for genuine evidence, not just policies on paper, but proof that those policies are actually implemented and working in your business.

Common reasons businesses fail or struggle with ACS approval:

Directors do not hold valid SIA licences when they apply
The business has not been operating for 12 months at the time of application
The self-assessment workbook is completed inaccurately or without sufficient evidence
Policies and procedures exist on paper but are not actually implemented in practice
Staff training records are incomplete or missing
The business does not work to the required British Standards, particularly BS 10800
Quality management systems are informal or undocumented

For a well-run security company that has proper processes in place, ACS approval is very achievable. The scheme is not designed to be an impossible hurdle; it is designed to recognise businesses that genuinely operate professionally.

But getting there requires proper preparation. That means honest self-assessment, thorough documentation, and ideally, support from someone who knows the scheme inside out.

How to Maintain and Renew Your ACS Status

ACS approval is not permanent. You must actively maintain your status throughout the approval period.

Here is what maintaining ACS status involves:

Annual re-registration with the SIA: submit your annual return and pay the annual registration fee
Annual continuation of approval assessment, an independent assessor reviews your business performance every year
Full re-assessment every three years, a comprehensive re-evaluation against the full ACS standard
Continuous compliance, all directors must maintain valid SIA licences, and all deployed operatives must remain licensed at all times.
Ongoing standards compliance, you must continue to work to BS 10800 and any other relevant British Standards.

The most important piece of advice on maintaining ACS status: do not treat it as an annual admin task. The ACS is a continuous commitment to operating your business to a high standard. Companies that embed the ACS framework into their day-to-day operations find renewal straightforward. Those who scramble to prepare just before the assessor arrives often struggle.

How BizGrow Holdings Helps You Get ACS Approved

Achieving ACS certification is a significant undertaking. The paperwork is substantial, the requirements are detailed, and the process takes time. Many security companies attempt it alone and find themselves stuck, either failing the assessment or taking far longer than necessary.

BizGrow Holdings provides end-to-end ACS consultancy support for UK security companies. We understand the scheme inside out. We know what assessors look for. And we know how to help your business get there properly, the first time.

Here is what we do:

Eligibility review, we confirm your business meets all SIA requirements before you start, saving you from wasted applications
Gap analysis: We assess your current policies, processes, and documentation against the ACS standard and identify exactly what needs to improve
Self-Assessment Workbook support, we will work through the 92-page workbook with you, ensuring your scores are accurate and supported by evidence.
British Standards compliance, we help you implement BS 10800 and other relevant standards into your management systems.
ISO 9001 alignment, we help you align your quality management system with ISO 9001, satisfying around two-thirds of the ACS workbook criteria
Documentation and policy development, we help you create or improve the policies, procedures, and records your business needs.
Audit preparation, we make sure your business is genuinely ready before the assessor arrives, not just on paper, but in practice.
Post-approval support, we help you maintain compliance and prepare for annual reviews and the three-year reassessment.

We have helped security businesses of all sizes across the UK achieve ACS approval, from start-up firms going through the process for the first time to established companies upgrading their approach before a reassessment.

If you want to get ACS approved without the stress and uncertainty of doing it alone, BizGrow Holdings is here to help. Visit bizgrow-holdings.com to speak with our team.

Conclusion | Take the First Step Towards ACS Approval

ACS certification is one of the most valuable investments a UK security company can make. It sets you apart. It builds trust with clients & opens doors to contracts that are otherwise out of reach.

In 2026, the private security market is more competitive than ever. Clients are asking harder questions. Procurement teams want proof of standards, not just promises. ACS approval gives you that proof.

The process is thorough. But it is absolutely achievable, especially with the right support.

Start by downloading the ACS Self-Assessment Workbook from the SIA’s website and working through it honestly. Identify your gaps. Put your processes in place. And when you are ready, speak to the team at BizGrow Holdings.

We will help you get there. Visit bizgrow-holdings.com today.

FAQs About SIA ACS Certification in the UK 2026

1. What does ACS stand for in the security industry?

ACS stands for Approved Contractor Scheme. The full name is the SIA Approved Contractor Scheme, managed by the Security Industry Authority, the UK’s regulatory body for the private security industry.

2. Is ACS certification mandatory for security companies in the UK?

ACS is a voluntary scheme. However, it is increasingly required by public sector clients, procurement frameworks, and large contractors as a minimum standard. For any security company serious about growth, it is essential.

3. How long is ACS certification valid for?

ACS approval requires annual re-registration with the SIA and a full independent reassessment every three years. You must maintain compliance continuously, not just at assessment time, to keep your approved status.

4. Can a new security company apply for ACS?

Your business must have at least 12 months of operating history supplying contracted security services, hold at least one active client contract, and deploy a minimum of two licensed operatives per sector. New businesses need to establish these foundations before applying.

5. What happens if you fail the ACS audit?

If your assessment identifies shortfalls, the SIA will not approve until they are resolved. You will need to address the gaps and go through the verification process again. Working with an experienced consultant before you apply significantly reduces the risk of this outcome.