Why contractor safety certification can be difficult to evidence under the Common Assessment Standard

For contractors working in construction, achieving compliance is only part of the challenge. Increasingly, clients want clear evidence that policies, procedures and management systems are being implemented, maintained and reviewed in practice. 

The Common Assessment Standard  requires organisations to provide documented evidence that policies, procedures and management systems are actively implemented, maintained, and reviewed. Developed by Build UK and industry partners, the standard builds on the prequalification approach previously provided through PAS 91 and is widely used to assess contractors across multiple areas of risk management. It also aligns with industry-recognised approaches to contractor assessment, including SSIP (Safety Schemes in Procurement).  

While the requirements may appear straightforward, providing sufficient evidence to support contractor safety certification can be more challenging than many organisations expect. 

In summary

Contractor safety certification can be difficult to evidence under the Common Assessment Standard because assessors require documented proof that policies, procedures and management systems are actively implemented. Common challenges include inconsistent records, outdated documentation, difficulties collecting evidence across multiple sites and a lack of documented proof that safety processes are being followed. 

What is the Common Assessment Standard?

The Common Assessment Standard is an industry-recognised construction prequalification framework designed to improve consistency across construction supply chains. It helps clients assess contractors against a common set of criteria, reducing duplication and streamlining procurement processes. 

The standard builds on principles previously covered by PAS 91 and extends assessment across multiple areas of risk management. The Common Assessment Standard covers 13 key areas, including health and safety, environmental management, quality management, equality, diversity and inclusion (EDI), corporate social responsibility (CSR), information security and financial standing, helping organisations demonstrate compliance, strengthen contractor assurance and reduce risk throughout the supply chain.

For many contractors, achieving certification is not the difficult part. Producing robust evidence to support compliance is often where challenges arise. 

Common Assessment Standard, SSIP and PAS 91 explained

The Common Assessment Standard is a construction prequalification framework developed to bring greater consistency to contractor assessment. It has become the industry’s leading prequalification standard and is widely used by clients to assess contractors across multiple areas of risk management. 

PAS 91 provided the foundation for many construction prequalification assessments, while the Common Assessment Standard expanded the scope to provide a broader and more comprehensive assessment framework. 

SSIP supports this process through mutual recognition between member schemes, helping to reduce duplication in health and safety assessments. While SSIP focuses specifically on health and safety competence, the Common Assessment Standard extends assessment across a broader range of organisational risk areas. Together, they help organisations demonstrate contractor compliance and health and safety competence more efficiently, while reducing duplication across the procurement process.  

Why is contractor safety certification difficult to evidence?

Contractor safety certification can be difficult to evidence because organisations must demonstrate that compliance activities are taking place in practice, not simply that policies exist. Assessors  require records, reports and supporting documentation that show procedures are being implemented, monitored and reviewed throughout the business. 

Businesses commonly encounter difficulties when documentation is inconsistent, records are spread across multiple sites or evidence has not been retained for assessment purposes. 

Why evidence matters for Common Assessment Standard certification

The Common Assessment Standard is designed to assess more than intentions. 

Assessors need to see evidence that policies, procedures and management systems are genuinely operating within the business. This means contractors must be able to demonstrate that compliance activities are documented, maintained and regularly reviewed. 

Without clear evidence, even businesses with strong safety cultures may find it difficult to satisfy assessment requirements. 

What do assessors look for? 

Assessors are typically looking for evidence that demonstrates management systems are embedded within day-to-day operations rather than existing only as documented policies. 

Depending on the assessment area, this could include: 

• Completed risk assessments 

• Records of toolbox talks and workforce briefings 

• Training certificates and competency records 

• Internal audit reports and corrective actions 

• Accident investigations and lessons learned 

• Evidence that policies have been reviewed and approved 

• Inspection records and monitoring activities 

The emphasis is on demonstrating that documented procedures are actively followed, regularly reviewed and continually improved.

Common challenges when evidencing contractor safety certification

Inconsistent documentation 

Many contractors develop policies over time as the business grows. While this approach can work operationally, it often results in documents being stored across multiple locations or managed by different individuals. 

During an assessment, this can create difficulties when trying to provide: 

• Health and safety policies 

• Risk assessments 

• Training records 

• Accident reporting procedures 

• Monitoring and review records 

If documentation is outdated, incomplete or inconsistent, demonstrating compliance becomes significantly harder. 

Difficulty proving implementation 

Having a health and safety policy is one thing. Demonstrating that it is actively implemented is another. 

Assessors may require evidence showing that procedures are communicated and followed throughout the business. Contractors often struggle when they have processes in place but limited records showing how those processes are applied in practice. 

For example, organisations may carry out toolbox talks, inspections or training sessions but fail to retain supporting records. 

Without documentation, proving compliance can become difficult. 

In many cases, businesses are carrying out the right activities but cannot easily demonstrate them during assessment because evidence has not been retained or centralised. 

Managing evidence across multiple sites 

Construction businesses frequently operate across numerous projects, subcontractors and locations. 

As businesses grow, collecting and maintaining evidence from different sites becomes increasingly complex. 

Information may be held by project managers, site supervisors or external consultants. Bringing everything together in a consistent format can be time-consuming, particularly when assessment deadlines approach. 

Keeping records up to date 

Compliance is not static. 

Evidence that was acceptable during a previous assessment may no longer be current. Policies, insurance documents, training records and management procedures all need ongoing review. 

Organisations often encounter difficulties because documentation has not been updated to reflect business changes, new legislation or revised working practices. 

This can create unnecessary delays during assessment. 

Understanding evolving requirements 

The construction compliance landscape continues to evolve, with organisations placing greater emphasis on supplier competence, robust due diligence and consistent evidence throughout the procurement process.  

For contractors, keeping track of changing requirements can be challenging, particularly for smaller businesses without dedicated compliance teams. 

As a result, organisations may not always understand what evidence is expected or how much detail assessors require. 

How SSIP supports contractor safety assessment

SSIP (Safety Schemes in Procurement) helps standardise health and safety assessments across the industry through mutual recognition between member schemes. This reduces duplication and allows contractors to demonstrate health and safety competence more efficiently. 

CHAS is a founder member of SSIP and was the first assessment body to offer the Common Assessment Standard.  

For contractors, this helps create a more consistent approach to contractor assessment, construction prequalification and supply chain compliance. 

Best practice for evidencing compliance under the Common Assessment Standard

To make evidencing compliance easier, contractors should focus on creating a structured and consistent approach to documentation. 

Key steps include: 

• Maintaining an up-to-date health and safety management system 

• Recording training, inspections and audits consistently 

• Reviewing policies regularly 

• Keeping evidence in a central location 

• Ensuring site records are completed and retained 

• Monitoring expiring documents such as insurance certificates and qualifications 

Contractors should also ensure they can quickly access documents commonly requested during assessment, including risk assessments, insurance certificates, training records, competency records, audit reports and evidence of management reviews.  

By keeping documentation organised throughout the year, businesses can reduce last-minute administrative pressure and make assessments more efficient.

Why a structured assessment process matters

The biggest challenge with contractor safety certification is often not compliance itself but proving it. 

Increasingly, clients are looking beyond policy documents to gain confidence that contractors are managing risk consistently across every project. Demonstrating documented evidence of compliance helps build trust, supports procurement decisions and provides greater assurance throughout the supply chain. 

A structured assessment process helps contractors understand what evidence is required and where potential gaps exist before they become barriers to certification. 

For organisations seeking to demonstrate compliance under the Common Assessment Standard, having clear documentation, robust processes and effective record management can make the difference between a smooth assessment and a difficult one. 

Key takeaway

The Common Assessment Standard is designed to assess documented compliance, not just policy ownership. 

Contractors that maintain organised records, regularly review documentation and consistently capture evidence of day-to-day compliance activities are typically better positioned to meet assessment requirements and achieve successful contractor prequalification outcomes.

Achieve the Common Assessment Standard with CHAS Elite

Ready to demonstrate compliance with confidence? 

CHAS helps contractors demonstrate compliance against recognised industry standards, including the Common Assessment Standard and SSIP requirements. As a founder member of SSIP and the first assessment body to offer the Common Assessment Standard, CHAS supports contractors looking to simplify compliance and strengthen their prequalification credentials.  

Explore the Common Assessment Standard with CHAS and discover how assessments can help simplify prequalification, strengthen contractor assurance and support your compliance goals.