For registered providers, structural warranties are a familiar part of the development process and a key component of project completion.
Their importance, however, tends to come into focus at two distinct points: towards the end of a project, when sign-off is required to achieve completion, and later, when defects emerge and insurers are asked to respond.
At both stages, the detail of how the warranty has been procured, managed and documented can make a material difference – whether in avoiding delay at handover or in determining whether remediation costs are recoverable.
Building Control and Building Warranties
A common assumption is that building control approval will carry through to warranty sign-off. In practice, that is not something registered providers can safely rely on.
Building control is concerned with compliance with statutory standards at the point of inspection. Warranty providers, by contrast, are assessing long-term insurability risk over the life of the policy. Those are different exercises, applied through different lenses.
The distinction tends to become most acute at the end of a project. Increasingly common situations include:
- works have passed building control inspection;
- but the warranty provider raises queries about durability, detailing or materials; and
- this requires further investigation, remedial works or qualifications to cover.
At that stage, options are often limited. Elements may be complete, access may be restricted, and completion – and associated funding – may depend on resolving those issues quickly.
The practical takeaway is that warranty input cannot be treated as secondary. Early and ongoing engagement is critical, particularly on schemes involving more complex design or construction methodologies.
Modern methods of construction and increased scrutiny
Modern methods of construction (MMC) are now firmly embedded within social housing delivery, driven by programme pressures, cost considerations and government policy. Warranty providers are not resistant to MMC in principle, but their focus is typically on how those systems perform in practice, particularly where schemes involve new or less well established approaches.
From the disputes we are seeing, issues tend to arise in areas such as:
- interfaces between systems, especially where off-site elements meet traditional construction;
- detailing that works in principle, but is not consistently executed on site;
- tolerances and movement which are not fully accounted for at design stage;
- reliance on standard manufacturer details that do not reflect the specifics of the project.
These issues are often compounded where design continues to evolve during construction, or where substitutions are made without clear alignment with the warranty provider and the underlying system approvals.
Most warranty providers will engage with MMC where there is a clear evidential and certification basis – including, where relevant, third-party accreditation and a demonstrable track record of performance. However, where those elements are absent, or where project-specific execution diverges from approved designs, underwriting risk increases.
In practice, these same issues frequently resurface later as disputes about:
- whether defects fall within the scope of cover; and
- how responsibility is allocated between contractor, designer and insurer.
The Golden Thread and claims
The Golden Thread is often presented as a forward-looking regulatory requirement. In practice, it also has a critical function in the context of warranty claims and cost recovery.
When defects arise, the immediate questions are evidential:
- what was actually constructed;
- whether it reflects the approved design;
- and how it aligns with the policy requirements.
Where those questions cannot be answered clearly, insurers are more likely to challenge:
- whether there is “damage” as required to trigger the policy, rather than an underlying defect alone;
- whether the relevant elements fall within the scope of insured works;
- and whether causation can be established to the level required.
This is not because non-compliance itself defeats cover – the purpose of the warranty is to respond to defective design or workmanship. The issue, in practice, is whether the policyholder can demonstrate how that defect engages the policy terms.
Clear and consistent project records – particularly for concealed elements such as fire stopping, cavity barriers and key interfaces – can therefore have a direct impact on the progression and outcome of a claim. Where that evidence exists, discussions tend to be more focused. Where it does not, positions have the potential to become more entrenched.
Completion and funding risk
From a delivery perspective, warranty sign-off remains a critical step in achieving practical completion and unlocking funding.
Most arrangements will require:
- a structural warranty from an acceptable provider; and
- confirmation that cover is in place at handover, often without material qualifications.
Where the warranty provider raises late-stage issues, the consequences can be significant:
- delay to handover;
- pressure on funding drawdown;
- and potential exposure to claims between employer, contractor and professional team.
These are not isolated issues. They reflect a broader point: the warranty is not just a post-completion safety net – it is a live part of the delivery process.
What we are seeing in practice
Across instructions, a number of consistent themes emerge:
- warranty providers raising technical or evidential points late in the programme;
- disputes over whether defects constitute insured damage or fall outside the policy;
- reliance on gaps in records to challenge claims or causation;
- uncertainty around how warranties respond in scenarios where there is risk, but limited or no visible damage.
These issues go beyond technical disagreements. They can determine:
- whether remediation works are funded;
- how quickly they can proceed; and
- how risk is managed in occupied buildings.
As a result, they are increasingly giving rise to formal coverage disputes and, in some cases, litigation.
A final point
Many providers have already carried out substantial fire safety or remediation works without warranty support, often where insurers declined cover on the basis that there was no actual damage or sufficiently imminent risk.
As discussed in my previous article on coverage decisions, those positions are rarely straightforward. They turn on detailed analysis of both the policy wording and the factual circumstances, and in some cases may merit closer scrutiny than they have historically received.
In that context, the way projects are delivered becomes even more important. Schemes that are:
- clearly documented;
- technically consistent; and
- aligned with warranty requirements from an early stage;
- are far better placed if a claim later arises.
For providers who have previously been advised that no viable claim exists under a structural warranty, it may therefore be worth revisiting that conclusion. Where the policy wording and evidential position are carefully considered, the outcome is not always as clear-cut as it first appears.
About the author
Greg Carter is a Partner in the Construction Team at Winckworth Sherwood LLP. He specialises in building safety and complex building defect claims, with particular expertise in building warranty disputes and insurer litigation within the construction sphere. If you would like to discuss any of the issues raised in this article, please feel free to contact him.
Disclaimer
This article is intended for general information purposes only and does not constitute legal advice. Specific advice should be sought in relation to particular circumstances.