What Is a Subcontractor PQQ? A QS and Procurement Guide

A subcontractor PQQ often arrives as a portal link or spreadsheet, and it is easy to treat it as one more form to complete. That view misses its purpose. A subcontractor PQQ is a structured pre-appointment check on a specialist's financial strength, insurance, accreditations, health and safety arrangements, and technical competence. It is not an administrative hurdle; it is the first evidence checkpoint in the appointment process. For regional contractors, this matters because it is where supplier risk can be identified, evidenced, and reused instead of being re-collected for every project.

This tutorial explains what a subcontractor PQQ is in plain English, why it functions as an evidence checkpoint rather than a formality, and how PQQ, PQ, CAS, and PAS 91 fit together. It then breaks down the five evidence categories, from financial and insurance questions to accreditation, health and safety, and technical competence. Finally, it examines the regulatory backdrop, including PPN 03/24, Building Safety, and public procurement, before showing why answers should be evidenced once and reused per project. By the end, you will know how to turn the PQQ into a standing compliance record.

What Is a Subcontractor PQQ? A Plain English Definition

A subcontractor PQQ, or pre qualification questionnaire, is a structured pre-appointment check a main contractor issues to a specialist before inviting it to price or tender a work package. In construction, PQQ is shorthand for the first gate in the appointment workflow.

In procurement terms, the PQQ is a qualification stage, not a selection stage. It confirms a supplier is eligible, insured and competent enough to be considered at all, before commercial scoring, bid comparison or price negotiation begins. Passing it does not win the work.

In practice, a PQQ tests five things:

• Financial soundness: can the specialist absorb a slow month or retention hit?
• Current insurance: are liability and, where relevant, professional indemnity covers in place at the right limits?
• Accreditations: does it hold the certifications the package requires, such as ISO 45001 or SSIP?
• Health and safety: can it manage H&S on site, not just write a policy?
• Technical competence: has it delivered comparable trade or package work?

For regional main contractors, the PQQ is the earliest point at which supplier risk can be evidenced and reused across projects, rather than re-collected for each new job.

It is not an administrative formality or box-ticking exercise. The answers form a record relied on at appointment and referred back to if competence, insurance or performance is questioned.

Why the PQQ Is an Evidence Checkpoint, Not a Formality

Every decision down the appointment chain, shortlist, award, mobilisation, rests on the evidence captured at the pre-qualification step. Thin or unverified answers rarely fail loudly at PQQ stage; they surface months later, when a package is awarded and nobody can produce the insurance certificate that was promised.

Regulation has sharpened the stakes. The Building Safety Act raises the bar on evidencing supplier competence at appointment. Under PPN 03/24, central government and wider public sector bodies should use the Common Assessment Standard to pre-qualify suppliers.

Then there is the expiry trap. A specialist that passed a PQQ two years ago may since have let its employers' liability insurance or SSIP certificate lapse. That is a live risk now. Evidence has a shelf life, and the PQQ is where that shelf life is first recorded.

Treat PQQs as one-off paperwork and the cost compounds: the same certificates are requested by email, chased by phone and filed in separate spreadsheets by the QS, procurement and site teams on every project. A completed PQQ should instead be the first entry in a supplier's standing compliance file, maintained and refreshed rather than submitted once and forgotten.

PQQ, PQ, CAS and PAS 91: Untangling the Terms

With the PQQ established as an evidence checkpoint, the terminology around it needs untangling. The pre qualification questionnaire is the document. PQ is the common shorthand for the pre-qualification stage itself. Construction tender packs often use the two interchangeably, so read PQQ as the form and PQ as the gate, unless the document says otherwise.

PAS 91:2010 set out core prequalification modules A1 to A4 covering supplier identity, financial information, business and professional standing, and health and safety policy and capability, plus four supplementary modules B1 to B4. Some frameworks and older client question sets still reference it.

The Common Assessment Standard (CAS) is the current reference point: an industry-agreed question set with desktop and site-based assessment standards, divided into 10 sections. Version 5 runs to 79 pages and is dated 1 July 2025.

Map your own PQQ to its structure: Section 2 Financial, Section 3 Corporate and Professional Standing, Section 4 Health and Safety, Section 6 Quality and Section 7 Building Safety. That alignment stops you asking a specialist for the same evidence in different formats.

Keep one distinction clear: the CAS is a standard-setting framework and question set produced by the industry, not a software platform. Compliance tools sit on top of that standard, so separate the framework from the tooling in your procurement documentation.

The Five Evidence Categories a Subcontractor PQQ Covers

Whatever format your PQQ takes, its questions funnel into five evidence categories. Each tests a different failure mode.

• Financial. Filed accounts, turnover, cash position, credit references and, where relevant, parent company guarantees or bonds. The question behind the question is whether the specialist can absorb a slow month or a retention hit without walking off site.
• Insurance. Public liability, employers' liability, professional indemnity where design responsibility sits with the specialist, contract works cover and any project-specific requirements. Record limits, policy numbers and expiry dates, not just certificate numbers.
• Accreditation. ISO 9001, ISO 14001 and ISO 45001, SSIP or CHAS registration, relevant trade and statutory registrations such as gas or electrical schemes, and current Common Assessment Standard certification where the client requires it.
• Health and safety. The written policy, risk assessment and method statement approach, incident and RIDDOR history, supervision arrangements, trained and certificated personnel, and evidence of CDM 2015 competence for the work being appointed. Under SSIP Core Criteria, the policy statement must be signed and dated within the previous 12 months.
• Technical competence. Comparable project experience and references, named supervisors and key personnel, qualifications and trade cards, plant and resource capacity, quality control, and how the specialist manages its own subcontracted labour.

These categories set the agenda for the financial and insurance questions explored next.

Financial and Insurance Questions: What They Reveal About Specialist Risk

Of the five evidence categories, financial and insurance questions carry the most immediate risk. Treat financial questions as insolvency screening, not a formality. Subcontractor failure mid-project is most often financial, and the earliest signal sits in the PQQ evidence pack. Request recent filed accounts, typically two to three years is standard practice, plus management accounts for smaller firms.

Check the ratio that matters: contract value against annual turnover and available cash. A specialist taking on a package worth a large share of its turnover carries concentration risk that a generic credit score will not reveal.

Set insurance limits against the actual package: employers' liability at the statutory minimum or above, public liability and professional indemnity at levels appropriate to the scope and client requirements, and contract works cover for the works themselves.

Record expiry dates, not just certificate numbers. Where manual tracking breaks, TenderBridge keeps expiry tracking on insurances and certificates in one dashboard, so a QS can see who is current before award rather than discovering a lapsed policy at mobilisation.

Accreditation, Health and Safety and Technical Competence: The Compliance Core

Beyond financial and insurance screening, the compliance core rests on accreditation, health and safety, and technical competence. Accreditation carries weight because audited third-party certifications such as ISO 45001 and SSIP certificates can exempt a supplier from some Common Assessment Standard questions. The underlying audit already evidences the management system the question tests. But look past certificate theatre. Verify the certifying body is recognised, confirm the scope of certification actually covers the work package, and check that the certificate is current rather than simply held.

Judge health and safety capability by what happens on site day to day: supervision ratios, briefing and toolbox talk routines, near-miss reporting, RIDDOR records and how corrective actions are closed out. A long policy document proves little on its own. Assess technical competence against the package, not the company in general. Ask for method statements for similar works, named supervisors and their qualifications, CSCS and trade cards, plant and temporary works capability, and references from comparable projects.

Place the Building Safety Act correctly. It strengthens the requirement to evidence the competence of those appointed, and the Common Assessment Standard can be used to demonstrate capability. The golden thread is a specific record-keeping duty for higher-risk buildings, so do not use it as a loose label for your PQQ file. Keep accreditation, H&S and technical evidence distinct, current and traceable.

The Regulatory Backdrop: PPN 03/24, Building Safety and Public Procurement

That compliance core sits against a changing regulatory backdrop. As already noted, PPN 03/24 directs central government and wider public sector bodies to use the CAS to pre-qualify suppliers. Practically, the specialist answers once, in a format clients already recognise.

The Building Safety Act reinforces that appointment-stage competence evidence must be demonstrable, the PQQ is where that evidence is first recorded.

The Procurement Act 2023 introduces a revised public procurement framework. Confirm current commencement dates, transitional arrangements and published guidance for your frameworks before relying on any specific provision.

For regional contractors, keep evidence current and auditable rather than complete and archived. An expired certificate found during a client audit costs far more time than a reminder sent two weeks before it lapses.

Finally, keep the boundary clear in your own paperwork: TenderBridge supports duty holders by maintaining a current, auditable record of supplier checks. It does not replace statutory duties, professional judgement or the golden thread regime for higher-risk buildings.

Why PQQ Answers Should Be Evidenced Once and Reused Per Project

The duplication problem is plain. A specialist may send the same insurance certificate and accreditation evidence to several main contractors in a single year. Each contractor re-requests it, re-files it and re-checks it in isolation. The evidence is identical; the effort is multiplied.

Reuse follows from how evidence actually ages. Common Assessment Standard certification is renewed once a year by a Recognised Assessment Body, while time-critical documents such as insurance expire on their own dates. That creates a natural refresh cycle. Maintain the record once and update it on expiry, rather than rebuilding it per project.

Subcontractors can act now. Specialist trades use TenderBridge free to build a reusable capability profile and a knowledge bank of company information. Upload a PQQ you have already completed and new questionnaires auto-fill with answers previously given, ready to review and share with any main contractor from one place.

Main contractors get the mirror. Contractor plans start at £49 a month, giving QS and procurement teams standing compliance requirements, supplier folders organised by project or trade, bulk import of existing supplier lists, and a dashboard showing who is current and compliant.

Some capability is planned, not live. Public tender opportunities for subcontractors, tender posting to a contractor's own supply chain or an open noticeboard, and AI shortlisting and bid comparison are roadmap items. Treat them as future features.

Conclusion: Turn the PQQ Into a Standing Compliance Record

Reuse only pays off if the underlying record stays current. That is the shift this definition points to: treat the subcontractor PQQ as the first evidence checkpoint in appointment, not a form to send and forget. The financial, insurance, accreditation, health and safety and technical competence answers all feed the decision that follows, and they are only as good as the date on the certificate behind them.

Start by auditing what you already collect. Which documents carry expiry dates, and how do you currently learn about a lapse? If the answer is that you find out at mobilisation, the process needs changing.

Align your questions to the Common Assessment Standard so specialists answer in a format public sector clients already recognise.

Finally, build a maintained record rather than a project folder. Platforms such as TenderBridge exist to keep that record current, with expiry tracking and a shared dashboard. That is the difference between evidence and paperwork.