Become a supplier

What you need to know

Here you can find the key standards and documents required for our PQQ process, including policies on safety, sustainability and responsible practice. You can register your interest in becoming a supplier at the bottom of this page.

Mandatory prequalification requirements - All supply chain members must hold a valid Common Assessment Standard desktop certificate as a minimum. For high‑risk trades, suppliers must also complete the CAS desktop certificate and audit.

Achilles UVDB

Supply chain undertaking utility works must hold: Achilles UVDB plus relevant B1 or B2 Audit.

RSSB RISQS

Supply chain undertaking rail or trackside works must still hold RSSB RISQS plus relevant Audit.

Common Assessment Standard

The CAS can be obtained through recognised assessment bodies listed on the Build UK website.

Fair payment

Our diverse supply chain brings fresh ideas and helps us maintain capacity in a growing market. Fair, prompt payment keeps cash flowing, supports jobs and builds confidence. We’re committed to meeting our payment promises and continually improving and support the Fair Payment Code.

Fair payment code

Two construction workers in high-visibility vests and helmets discussing at a busy site.

Our standard payment terms are 30 days from receipt of invoice, or in some cases 30 days from month end. We report payment performance every six months, as required by legislation, and our published data shows continued improvement throughout 2025.

Want to work with us?

Register to begin the PQQ process and meet the standards required.

Register here