Collateral warranties are not a shortcut to adjudication.
Collateral warranties are often treated as project close-out documents. They are requested by funders, purchasers, tenants or other third-party beneficiaries, issued under pressure, and sometimes signed late in the project lifecycle after the commercial focus has moved to completion, sale, occupation or final account. That approach is too casual. A collateral warranty may look like secondary project paperwork, but it can materially affect who can claim, what obligations are owed, and whether adjudication is available.
The dispute in Abbey Healthcare (Mill Hill) Ltd v Augusta 2008 LLP, formerly Simply Construct (UK) LLP arose from defects at a care home project and a collateral warranty executed in favour of Abbey after the works had been completed and after defects had been identified. Abbey sought to adjudicate under the warranty. The Supreme Court held that the warranty was not a “construction contract” for the purposes of section 104(1) of the Housing Grants, Construction and Regeneration Act 1996, meaning that it did not carry a statutory right to adjudicate. That made the case commercially important because it confirmed that a typical collateral warranty will not automatically import the statutory adjudication machinery simply because it relates to construction works.
For contractors, the decision is important because it confirms that post-completion documents can materially affect dispute routes, but not always in the way a beneficiary expects. A warranty may create rights and obligations, but it will not automatically import the statutory adjudication machinery that applies to the underlying building contract. Whether adjudication is available will depend on the nature and wording of the document, not simply on the fact that the warranty relates to construction works.
Why the decision matters
The commercial importance of Abbey v Simply Construct lies in the distinction between two different kinds of promise. A contract for construction operations engages the statutory adjudication regime because it is an agreement for the carrying out of construction operations. A collateral warranty, by contrast, is often a derivative document. It gives a third party a right of action in respect of obligations owed under another contract, but it does not necessarily create a separate obligation to carry out construction operations for that beneficiary.
That distinction matters because adjudication is a powerful dispute route. It gives parties speed, interim enforceability and immediate commercial pressure. A beneficiary seeking to pursue defects or performance issues through a collateral warranty may prefer adjudication because it is faster and more tactical than ordinary litigation. After Abbey v Simply Construct, that route cannot be assumed. Unless the warranty expressly provides for adjudication, or is drafted so that it genuinely qualifies as a construction contract, the statutory right may not be available.
For contractors and subcontractors, the risk is not one-sided. A contractor may welcome the decision where it limits a beneficiary’s ability to use adjudication under a standard collateral warranty. But the same contractor may also rely on warranties, assignments or third-party rights in other contexts. The broader lesson is therefore not simply defensive. It is that dispute routes must be understood before collateral documents are signed, relied upon or enforced.
Warranty wording affects dispute architecture
Collateral warranties should not be treated as administrative attachments to the main contract. They form part of the wider dispute architecture of the project. They may affect who can claim, what can be claimed, when claims can be brought, whether rights can be assigned, what standard of performance is warranted, whether liability is capped, whether net contribution wording applies, whether limitation runs from execution or completion, and whether adjudication is available.
The wording matters because many warranties do more than record historic compliance. Some contain promises about past and future performance. Some are executed long after the works have been completed. Some are required as a condition of funding, sale or lease. Some are heavily negotiated. Some include express adjudication clauses, while others are silent. Those differences can change the route and risk profile of any later dispute.
For Legalbuild clients, the issue is practical. A warranty signed quickly to satisfy a project requirement may later become the document through which a third party pursues defects, loss of profit, remedial cost or other downstream claims. If the contractor has not reviewed the warranty properly, it may not understand the claimants it has exposed itself to, the obligations it has repeated, or the dispute process it has accepted.
Post-completion documents can carry live risk
The timing of collateral warranties often creates false comfort. Because they are frequently dealt with at practical completion, sale, lease, funding close or project close-out, they can be viewed as secondary documents. That is a mistake. The fact that a warranty is signed late does not mean the risk is minor. In Abbey v Simply Construct, the warranty was requested and executed after defects had already been discovered, which demonstrates how collateral documents can become directly connected to live dispute strategy.
Contractors should be particularly careful where warranties are requested after completion or after a problem has emerged. In that situation, the document may not be a neutral administrative requirement. It may be part of a developing claim structure. The contractor should understand why the warranty is being requested, who will benefit from it, what obligations it repeats, whether it is retrospective, whether limitation periods are affected, and whether any dispute route is being created or excluded.
The commercial question is not only “do we have to provide the warranty?” The better question is “what future claim, forum or liability profile does this document create?”
The practical message for contractors
The practical lesson from Abbey v Simply Construct is that collateral warranties should be reviewed before they are signed, not filed as routine completion paperwork. Contractors should understand the identity of the beneficiary, the obligations being warranted, the relationship between the warranty and the underlying contract, the effect of any retrospective wording, the assignment provisions, any limitation wording, any net contribution clause, the dispute resolution clause and whether adjudication is expressly included.
This review matters most where the contractor is under pressure to sign. Funding, sale, lease and completion processes often create commercial pressure to provide collateral documents quickly. That pressure should not prevent proper analysis. A short collateral warranty can still create significant exposure if it extends obligations, removes protections, creates wider beneficiary rights or gives a third party a direct route to pursue the contractor. Where a contractor does agree to adjudication under a collateral warranty, it should do so deliberately. Where it does not, the document should not accidentally create ambiguity. The objective is not to avoid all third-party obligations. The objective is to know what obligations are being accepted and how any dispute will be resolved.
Legalbuild’s view
For Legalbuild, Abbey v Simply Construct reinforces a broader point about construction risk: legal exposure is not confined to the main building contract. Warranties, assignments, third-party rights and close-out documents can decide who can claim, what they can claim, and the forum in which the dispute is pursued. Collateral warranties are therefore not just legal paperwork. They are part of the project’s risk and recovery structure. Contractors should not sign them without understanding their dispute consequences, particularly where the document is requested late, after defects have emerged, or as part of a funding or transaction process.
The Legalbuild view is that every collateral document should be treated as part of commercial risk governance. The contractor should know whether the warranty merely mirrors existing obligations or creates additional exposure. It should know whether adjudication is included, excluded or uncertain. It should know whether the beneficiary can assign the warranty and whether liability limits remain effective. Abbey v Simply Construct does not mean collateral warranties are unimportant. It means their wording matters more. Contractors who treat them as routine close-out documents may miss the point at which future dispute rights are being created, narrowed or redirected.
Case reference: Abbey Healthcare (Mill Hill) Ltd v Augusta 2008 LLP, formerly Simply Construct (UK) LLP [2024] UKSC 23.
