Stay one step ahead: Common Assessment Standard version 4 explained

The construction industry has seen a significant shift in construction pre-qualification processes with the latest update to the Common Assessment Standard.

Released by Build UK in 2024, version 4 of the Common Assessment Standard (CAS V4) introduces a new section on building safety, aligning with the Building Safety Act (BSA) to promote compliance, transparency and safety across the sector. For construction subcontractors and main contractors, understanding and integrating these changes will be essential to staying competitive.

With Constructionline’s platform now updated, here’s what you need to know.

 

What is the Common Assessment Standard?

The Common Assessment Standard, developed by Build UK in partnership with Constructionline, is a standardised pre-qualification questionnaire (PQQ) for the construction sector. It streamlines the construction procurement process by providing a unified set of questions for assessing suppliers and subcontractors. This standardisation of construction PQQs improves efficiency by reducing duplication, and saving time and resources for both subcontractors and main contractors.

The Common Assessment Standard also promotes transparency by ensuring all construction suppliers are aware of the requirements. This promotes a more competitive and informed working environment.

 

What’s New in the Common Assessment Standard V4?

	Building safety section CAS V4 introduces a dedicated building safety section, designed to verify subcontractors meet Building Safety Act requirements. This helps ensure certified suppliers have the organisational capability to fulfil their roles under the Building Safety Act, a critical aspect for projects subject to stringent safety standards.
	Advisory status for 6 months, which will not impact your Gold or Platinum Verification status Completing the building safety section is currently advisory, allowing companies time to familiarise themselves with the new questions and requirements. Later in 2025, this section will transition to mandatory for specific projects. While it is advisory, the new section will not impact your Gold or Platinum verification status.
	Specific supporting documentation is required for the BSA section Although the new BSA section is not mandatory for a period of time. If you want to be verified for this section, you will need to upload new supporting documentation. To help you, we have this guidance document to view.

 

Does the Building Safety Act apply to you?

While the new BSA section of CASv4 is optional for the time being, it will apply to a large proportion of the industry. We’ve created a short video to help you understand who the BSA applies to.

Please note: Your contractors may request you to complete these questions to align with their own supply chain policies. Staying ahead of the curve by completing the new questions could give you a competitive edge.

 

How CAS V4 benefits subcontractors

For subcontractors, CAS V4 provides a straightforward route to showcase compliance with the BSA and industry regulations. It also helps open doors to new business opportunities. The standard offers real-time compliance updates, reducing the administrative burden on smaller companies that typically manage high verification costs.

Additional benefits include enhanced credibility by demonstrating a commitment to safety and compliance. It also increases visibility – being on the Constructionline platform connects subcontractors with main contractors actively seeking compliant partners.

 

What help is on hand?

At Constructionline, we’re committed to supporting your success. To help you navigate these changes, we’re providing:

	A detailed guidance document on the new BSA section of CAS V4 with advice on the supporting documentation you need to upload to help you complete the BSA-related questions.
	Access to our expert support team via Live Chat if you’re a Constructionline member, or via the website here.
	Visit our dedicated BSA Hub for educational resources, including videos, guides and webinars.

 

How CAS V4 benefits main contractors

For main contractors, CAS V4 provides peace of mind by pre-qualifying subcontractors who are compliant with the latest industry standards. The building safety section helps assure that subcontractors meet necessary organisational capabilities, reducing the risk of non-compliance and potential project delays.

With a pool of verified suppliers simplifying project planning and procurement, you get easier supplier management. Meanwhile, CAS V4’s clear safety and compliance standards enhance project quality and safety – providing you with greater transparency and accountability.

For main contractors, CAS V4 offers a unique opportunity to pre-qualify suppliers who comply with the latest safety and compliance standards. You don’t need to take immediate action, but informing your supply chain of the CAS V4 updates can help strengthen your project outcomes, by ensuring that only qualified subcontractors participate.

 

Marketplace: The easiest way to find CAS-verified suppliers Did you know, 80% of the UK’s Common Assessment Standard-compliant subcontractors are found on Constructionline? Gold or Platinum members simply use the “Find Suppliers” section of our platform’s Marketplace app – this ensures they align with the Common Assessment Standard.  Benefits: Up-to-date subcontractor information Regular monitoring      Verification of credentials to main supply chain compliance, as well as safety, quality and sustainability standards

 

Industry-expert resources on the Common Assessment Standard

To help the industry navigate these changes, we’ve created new content featuring industry expert Paul Reeve. Explore our blog post and watch the video for insights on how to meet Common Assessment Standard and BSA requirements efficiently.

How Constructionline can help you get ready for CAS V4

At Constructionline, we’re here to simplify your compliance journey. Our platform allows subcontractors to complete the CAS and BSA sections, while construction main contractors can search our pool of verified, pre-qualified subcontractors aligned to these standards. Whether you’re considering Gold or Platinum membership, or simply want to strengthen your position for upcoming projects, our tools can help.

Subcontractors: Sign up for Gold or upgrade your account to stay CAS and BSA compliant.	Current Gold members: Log in to complete the new building safety section.	Main contractors: Contact us today to learn how to source CAS V4-aligned partners.

Aligning with CAS V4 is a step towards a safer, more transparent construction industry. Whether you’re a subcontractor or a main contractor, understanding CAS V4 will put you ahead.