Associated British Ports v Hydro Soil Services NV & Ors

A contractual fitness-for-purpose obligation requires the completed works to be capable of performing their specified function without an unacceptable risk of failure or unserviceability in the contemplated conditions. A separate entitlement to payment for unforeseeable physical conditions does not modify or qualify that obligation. For structural works, compliance with relevant design standards may assist in assessing fitness, but the ultimate question is whether the required performance criterion is met. A design is unfit where its components lack sufficient capacity to withstand the foreseeable forces, including required shear forces at ultimate limit state.

The claimant engaged HSS under a lump-sum contract to design and construct strengthening works for a steel sheet-pile quay wall at Southampton, so that the berth could be dredged deeper. HSS subcontracted the design to Haecon. The works included ground anchors and high-pressure vertical grout columns.

The sheet-pile wall cracked and bulged during the grouting works. ABP claimed that the works were not fit for purpose and sought relief for defective works. HSS counterclaimed additional payment for allegedly unforeseeable physical conditions, including the pre-existing condition of the wall, concrete beneath the coping beam, and grout-disposal difficulties. HSS also pursued a claim against Haecon under the design contract.

The central issues were whether the relevant conditions were unforeseeable, whether the strengthening design and construction satisfied the fitness-for-purpose obligation, and whether Haecon was responsible for design defects.

1. Clause 12 claim. The physical condition of the existing sheet-pile wall could fall within the contractual concept of a physical condition, but the defendants failed to prove that the wall was overstressed or contained plastic hinges before the works. The relevant conditions were not unforeseeable to an experienced contractor. The claim for extra payment therefore failed.

2. Fitness for purpose. The fitness obligation was clear and was not modified by clause 12. Clause 12 provided a possible entitlement to additional payment, but did not relieve the contractor from delivering works fit for their intended purpose. Fitness required the absence of an unacceptable risk of failure or unserviceability when the berth was dredged to the specified depth and overdredge allowance.

3. The grout-wall design was unfit because its shear capacity was insufficient. The court assessed the required shear force at about 340 kN per column and concluded that the available capacity, applying an appropriate material safety factor to the soilcrete, was inadequate. A design dependent on rupture of the soilcrete columns and mobilisation of reinforcement dowel action to avoid collapse did not satisfy the fitness requirement.

4. The works were also unfit as built because column spacing was materially greater in places than the design spacing, and because several column pairs were likely to have lost composite action through non-parallelism, setting-out errors and reduced column diameters. The reduced diameters were treated as workmanship rather than design defects.

5. The grouting works caused cracking and bulging of the sheet-pile wall and were themselves unfit for purpose. However, the evidence did not establish on the balance of probabilities that the particular grouting damage was attributable to Haecon’s design rather than to the handling of blockages during execution.

6. The coping-beam concrete was reasonably foreseeable to an experienced contractor, so that claim failed. The grout-disposal claim also failed: the contractual provisional sum was capped and ABP was not contractually bound to provide a disposal area within 500 metres.

7. HSS breached its obligation to procure a parent-company guarantee extending beyond December 2002. Specific performance was refused because it would require procuring a third party’s guarantee. Haecon was liable for design defects concerning shear capacity, column spacing and design allowance for permissible construction tolerances. The court reserved further submissions on relief and quantum.