Structural warranties in social housing: managing risk from construction to claim

For registered providers and local authorities, structural warranties are a routine feature of development. Their significance, however, tends to crystallise at two critical points: at completion, when sign-off is required to unlock handover and funding, and later, when defects emerge and a claim is made.

At both stages, the way in which the warranty has been procured, managed and documented can have a direct bearing on outcomes - whether that is avoiding delay at practical completion or securing a favourable response from insurers.

Building control versus warranty approval

A persistent misconception is that building control approval will translate into warranty sign-off. In practice, these are distinct exercises.

Building control focuses on compliance with statutory requirements at the point of inspection. Warranty providers, by contrast, assess long-term risk over the life of the policy. That difference in perspective frequently becomes apparent towards the end of a project, where:

• works have passed building control inspection;
• the warranty provider raises concerns around durability, detailing or materials; and
• further investigation or remedial work is required before cover is confirmed.

At that stage, options are often limited. Works are complete, access can be constrained, and completion (and associated funding) may depend on resolving issues quickly.

The practical point is clear: warranty engagement should not be treated as a final-stage formality. Early and ongoing alignment is essential, particularly on more complex schemes.

Modern methods of construction: increased scrutiny

Modern methods of construction (MMC) are now firmly embedded in housing delivery. Warranty providers are not resistant to MMC as such, but their focus is on how systems perform in practice - particularly where approaches are novel or insufficiently evidenced.

Issues frequently arise in relation to:

• interfaces between off-site and traditional construction;
• inconsistencies between design intent and site execution;
• movement, tolerances and sequencing not fully addressed at design stage; and
• reliance on generic manufacturer details not tailored to the scheme.

These risks are often exacerbated where designs evolve during construction or substitutions are made without clear engagement with the warranty provider.

Where MMC systems are supported by robust evidence - such as third-party accreditation and a demonstrable performance record - providers will generally engage. Where that evidential base is lacking, scrutiny increases.

The same issues commonly resurface at claims stage, particularly in disputes over scope of cover and allocation of responsibility.

The “Golden Thread” and evidential challenge

The “Golden Thread” is often discussed in regulatory terms. It also has a direct and practical function in the context of warranty claims.

When defects arise, the key questions are evidential:

• what was actually constructed;
• whether it reflects the approved design; and
• how it aligns with policy requirements.

Where those questions cannot be answered clearly, insurers are more likely to challenge:

• whether there is “damage” sufficient to trigger the policy (as opposed to a defect alone);
• whether the affected elements fall within the insured scope; and
• whether causation can be established.

That issue is particularly acute in fire safety cases.

Following the initial developer liability period, many warranty policies require policyholders to demonstrate that defects have caused damage or give rise to imminent damage or danger. In practice, disputes frequently arise where insurers contend that, absent visible damage, the policy is not engaged.

Recent authority has clarified that this approach is too narrow.

In Zagora v Zurich, the Court confirmed that policyholders are not required to wait for damage to occur, provided there is a real and proximate risk of damage or danger arising. More recently, in Vivid Housing v Allianz, the Court recognised a critical practical point in the context of fire safety: fire is an ever-present risk.

Where fire safety defects mean that a building would not perform as intended in the event of a fire, the requirement for “imminent” damage or danger can be satisfied - even if no fire is itself imminent.

This reflects a common-sense position. In buildings where compartmentation, cavity barriers or external wall systems are defective there is an ongoing risk to occupants, and any fire is likely to result in serious or catastrophic damage.

In that context, the focus is not on whether a fire is about to occur, but whether the building can safely withstand one if it does.

The practical implication is this: in fire safety cases, the distinction between “defect” and “damage” is often less clear-cut than insurers suggest. Where defects fundamentally undermine the fire strategy, the risk required to trigger cover may already be present.

As a result, clear and consistent project records—particularly for concealed fire safety elements—can have a direct bearing not only on causation, but on whether the policy responds at all.

Completion risk and funding implications

Structural warranties remain central to achieving practical completion and satisfying funder requirements. Most arrangements require:

• a warranty from an acceptable provider; and
• confirmation that cover is in place at handover, typically without material qualifications.

Late-stage issues raised by warranty providers can therefore result in:

• delay to handover;
• disruption to funding drawdown; and
• potential disputes between employer, contractor and the professional team.

This underlines a broader point: the warranty is not simply a post-completion safeguard - it is a live project risk.

What we are seeing in practice

Recent instructions highlight several consistent themes:

• technical and evidential queries raised late in the programme;
• disputes over whether defects constitute insured “damage”;
• reliance on gaps in records to challenge claims;
• uncertainty where there is identified risk but limited or no visible damage; and
• disputes in fire safety cases as to whether defects give rise to “imminent” damage or danger, particularly where no fire event has occurred but the fire strategy is compromised.

These are not purely technical disagreements. They directly affect whether remediation works are funded, the speed at which issues can be addressed; and risk management in occupied buildings.

Unsurprisingly, these issues are increasingly giving rise to coverage disputes and, in some cases, litigation.

Revisiting historic positions

Many providers have undertaken substantial remediation works without warranty support, often following insurer positions that no recoverable “damage” had arisen.

Such conclusions are rarely straightforward. Outcomes depend on the specific policy wording and the underlying factual matrix. In some cases, earlier decisions may warrant closer re-examination.

At the same time, the position reinforces the importance of project-stage discipline. Schemes that are clearly documented, technically consistent and aligned with warranty requirements from the outset are significantly better placed if a claim arises.

Conclusion

Structural warranties sit at the intersection of construction delivery, risk management and dispute resolution. For local authorities and registered providers, their effective management is not simply a technical issue - it is central to programme certainty, financial exposure and long-term asset strategy.

A proactive approach at project stage is often the best protection against later dispute.

These issues are increasingly informed by emerging case law on imminence, particularly in fire safety claims, where the courts are taking a more practical approach to how risk is assessed.

Greg Carter is a Partner in the Construction Team at Winckworth Sherwood LLP, advising local authorities and registered providers on building safety and complex defect claims. He has significant experience in building warranty disputes and is regularly instructed on high-value claims involving fire safety, structural and other building defects, coverage challenges and insurer declinatures. Greg works closely with in-house teams to develop recovery strategies, challenge adverse coverage decisions and manage risk across large housing portfolios.