A standout feature of the 2021 Green Book is the introduction of a formula for Contractor's entitlement to prolongation costs (compensable delays). This innovative addition avoids complex, expensive forensic delay analysis, allowing parties to calculate delay costs using a predetermined daily rate or percentage specified in the Contract Data. 4. Dispute Resolution Mechanics

: Parties can choose between various valuation methods, including Re-measurement , or any combination thereof. Revised Claims Procedure

If you are digging a trench or laying a pipe, use the Green Book. If you are plastering a wall or tiling a roof, use JCT MW.

⚠️ Without a neutral Engineer, disagreements over quality or time can become “he said, she said.” Keep good records. ⚠️ Not for Design Responsibility: If the Contractor must produce detailed design (not just build to spec), consider a more robust contract (e.g., IChemE Red Book). ⚠️ Liability Cap: The cap is often set at the contract price, which may be insufficient if the Contractor’s negligence causes injury or major plant damage. Review insurance requirements carefully. ⚠️ No Subcontractor Flow-Down: If the Contractor uses subs, you must ensure those subs are bound by equivalent terms – the Green Book assumes a single responsible Contractor.

The contract is structured logically to ensure accessibility for parties who may not have extensive legal teams. It generally includes: