FIDIC Yellow Book (Plant & Design-Build)

The FIDIC Yellow Book is the informal name for the FIDIC Conditions of Contract for Plant and Design-Build, which governs contracts where the contractor is responsible for both the detailed design and the construction or installation of the works. It is widely used for power plants, water treatment facilities, process plants, and other projects where the employer provides performance requirements rather than detailed construction drawings.

What is the FIDIC Yellow Book?

Unlike the fidic-red-book, where the employer provides the design and the contractor builds to it, the Yellow Book reverses the design responsibility: the employer issues Employer's Requirements (functional and performance specifications), and the contractor produces all detailed drawings-and-plans and specifications necessary to achieve those requirements. The contractor warrants that the completed plant or works will meet the performance criteria, not merely that it was built to the drawings.

Payment under the Yellow Book is typically lump sum or milestone-based rather than remeasured, because the contractor controls the design and hence the quantities. The employer's engineer (under the 1999 edition) or the employer's representative (under the 2017 edition) administers the contract, reviews the contractor's design submittals, and certifies milestone payments and performance tests. Disputes follow the same path as the Red Book: Dispute Adjudication Board, then arbitration. The gcc used by development banks for design-build contracts often draws on Yellow Book conditions.

Why the FIDIC Yellow Book matters for bidders

Design-build contracts transfer significantly more risk to the contractor than traditional construct-only contracts. The contractor's price must encompass not just construction risk but also design development risk - the possibility that, as detailed design progresses, the cost of achieving the employer's performance requirements turns out to be higher than anticipated. Bidders on Yellow Book contracts must ensure their technical and design teams review the Employer's Requirements thoroughly during the bidding phase and that any ambiguities in the performance criteria are resolved through the clarification process before submission. Contractual fitness-for-purpose warranties mean the contractor remains liable if the completed plant does not meet performance criteria, even where construction was carried out to the letter of the approved design.

FAQ

What is the main difference between the Yellow Book and the Red Book?

The Red Book separates design (employer's responsibility) from construction (contractor's responsibility). The Yellow Book combines both responsibilities in the contractor, who designs against the employer's performance requirements and warrants the performance of the completed facility.

Is payment under the Yellow Book always a lump sum?

Not always, but lump sum or milestone-based payment is most common because the contractor controls the design. Some Yellow Book contracts allow provisional sums for items that cannot be fully designed at the time of bidding, which are later valued when the design is complete.

When would a procuring entity choose the Yellow Book over the Red Book?

A procuring entity chooses the Yellow Book when it wants to specify outcomes rather than methods, transfer design risk to the contractor, benefit from integrated design-and-build efficiencies, or procure specialist plant where the contractor has proprietary design knowledge that the employer cannot practically replicate in a full design package.