Structural Warranty Checklist for Developers

What should developers look for in a 10-year structural warranty?

Choosing a structural warranty involves more than comparing premiums. Proposals that look similar initially can be materially different once the insurer, lender acceptance, indemnity limit and technical requirements are examined.

This checklist covers the principal points developers should establish before appointing a provider. For a broader market review, our 2026 structural warranty provider comparison explains how the leading providers differ.

Review the cover and limit of indemnity

The first question is whether the policy provides enough cover for the completed development. The limit of indemnity should reflect the full reinstatement value—not simply the original construction cost, development finance or anticipated sales value.

Some providers may restrict the indemnity available per structure. This is particularly relevant to larger apartment buildings and mixed-use developments, where a policy limit could leave part of the reinstatement value uninsured.

The excess, principal exclusions, insured parties and treatment of common areas or commercial elements should also be reviewed. Where deposit protection or other pre-completion cover is required, this needs to be identified when terms are requested.

Two premiums cannot be compared properly unless the underlying protection is comparable.

Confirm the insurer’s financial strength

A structural warranty commonly lasts for 10 or 12 years, so the financial strength of the underlying insurer matters.

While nobody can guarantee the future solvency of a company, independent financial-strength ratings assess an insurer’s creditworthiness and ability to meet its obligations.

Developers may recall the failure of Alpha Insurance in 2018. Policies distributed through CRL were affected, leaving developers and homeowners to establish whether replacement protection was required.

The name of the warranty provider is not always the name of the insurer carrying the risk. It is therefore important to confirm who ultimately underwrites the policy and check that insurer’s financial rating.

J3 Advisory works with established structural warranty providers supported by A-rated insurance capacity.

Check lender acceptance against the development

Lender acceptance should be a key consideration when selecting a structural warranty provider.

A provider being listed as acceptable does not necessarily mean it will be accepted for every development. The position can depend on the lender, project type, construction method and, in some cases, the number of units within the scheme.

We check acceptance against the development itself. A provider may satisfy the development funder but not every lender financing the eventual purchasers. If this is only discovered close to completion, it can restrict sales and leave the developer with limited time to find an alternative.

Understand the technical process

We often see warranty terms compared on price before the technical process has been considered. The differences become apparent later, when a provider asks for additional inspections, design information or evidence that the project team had not allowed for.

Before making an appointment, developers need to understand which technical standards will apply, how the inspection programme will work and what information will be required during construction. It is equally important to establish which elements must be inspected and what must be provided before the final warranty can be issued.

Timing also matters. Once construction has started, insurers may request retrospective reports, additional inspections or opening-up works before agreeing cover. This can increase costs and reduce the number of available options.

The provider’s technical requirements need to work with the construction programme, particularly where warranty sign-off is linked to sales, refinancing or the release of development funding.

Consider experience with comparable developments

Questions are routinely asked about a developer’s experience, including its previous projects and the credentials of the contractor and professional team.

Developers should apply the same scrutiny to the proposed warranty provider. Has it supported developments of a comparable type and value? Is it comfortable with the construction method, and does its technical team have relevant experience? It should also understand the requirements of the funder and the intended exit, with a clear route from appointment through to warranty issuance.

This is particularly important for conversions, affordable housing, Build to Rent, PBSA, mixed-use developments and higher-value schemes. Experience of straightforward housing does not automatically translate to more complex projects.

Before accepting structural warranty terms

Before accepting terms, developers should confirm:

• who is underwriting the policy and the insurer’s financial rating;
• whether the provider is acceptable to the relevant lenders;
• whether the indemnity limit reflects the full reinstatement value;
• what the policy covers and excludes;
• what technical and inspection requirements will apply; and
• what will be needed to secure the final warranty.

Only once these points are understood can the proposals be compared properly on price.

Arranging structural warranties with J3 Advisory

Since 2021, J3 Advisory has arranged structural warranties for more than 5,000 homes across new-build, conversion, affordable-housing, Build to Rent, PBSA and mixed-use developments.

We compare suitable options across established providers, considering the funding, technical and delivery requirements of the development. We then remain involved throughout construction, helping clients coordinate technical information, manage outstanding requirements and progress towards warranty issuance.

Developers can explore the market further through our 2026 structural warranty provider comparison or use our structural warranty calculator for an initial indication of cost.

If you have a development you would like to discuss, contact J3 Advisory to request a formal quotation.