Structural Warranty vs Latent Defects Insurance

Structural Warranty vs Latent Defects Insurance: Which One Do You Need?

The terms structural warranty and latent defects insurance describe the same underlying purpose — protecting against hidden structural faults in a completed building — but they are not the same product. Using the wrong one, or assuming you have one when you need the other, creates gaps in protection that can be expensive to discover at the point of a claim.

This guide explains what each product is, how they differ in practice, who needs which, and how to make the right choice for your development or property.

What They Have in Common

Where They Differ

The distinction lies not in what they cover but in how they are structured, who distributes them, and which types of development each serves best.

Structural warranty: the residential standard

A structural warranty is a standardised product designed primarily for new build residential developments. It is distributed by warranty providers — such as Compariqo and Checkmate Warranty — who register the development, carry out stage inspections during construction, and issue the warranty certificate at completion.

The residential structural warranty follows a consistent two-period structure. For the first two years after practical completion, the builder is responsible for rectifying defects. From year three to year ten (or twelve), the policy provides insurance-backed cover for major structural defects. This format is familiar to mortgage lenders and is the product they specify when lending on new build homes.

Because structural warranties are standardised and distributed through warranty providers, they are relatively straightforward to arrange for a conventional residential development. The developer registers, inspections are carried out during the build, and the warranty is issued at handover.

Latent defects insurance: the specialist policy

Latent defects insurance is a broader and more flexible product category used primarily for commercial, mixed-use, and complex residential developments where the standard residential warranty structure is not the right fit.

Commercial LDI — also known as inherent defects insurance — is placed through specialist brokers with market access to insurers writing this class. Unlike residential warranties, it is not distributed through warranty providers with a standard registration and inspection process. Instead, it is individually underwritten based on the specific scheme, with terms negotiated to reflect the development type, construction methodology, and the requirements of funders and investors.

The flexibility that commercial LDI offers is also what makes it more complex to arrange. There is no single standard format. Policy terms, sums insured, cover extensions, and exclusions vary between insurers and policies. Getting the wording right for a specific development requires specialist advice rather than a standard registration process.

The practical summary:  For a new build residential development going to open-market sale or mortgage-financed purchase — use a structural warranty. For a commercial building, mixed-use scheme, build-to-rent development, or complex residential project that falls outside standard warranty provider criteria — use commercial latent defects insurance. When in doubt, the answer is specialist advice from Compariqo.

Which Development Types Use Which Product?

The table below gives a practical guide to which product is typically appropriate for different development types. It is a starting point — the right answer for a specific scheme depends on the lender’s requirements, the development’s complexity, and the policy options available in the current market.

Structural warranty: typically appropriate for

• New build houses and apartments for open-market sale
• Social housing and shared ownership schemes (usually 12-year policies)
• Self-build homes where the owner will occupy or sell the property
• New build homes requiring NHBC Buildmark or an equivalent lender-approved warranty
• Conversion and renovation projects meeting warranty provider criteria

Latent defects insurance: typically appropriate for

• Commercial offices, retail, industrial, and warehouse developments
• Hotels and student accommodation
• Build-to-rent residential schemes where the developer retains the asset
• Mixed-use developments with complex combinations of uses
• Large-scale residential developments requiring bespoke policy terms for institutional funders
• Developments using non-standard construction methods not covered under standard warranty criteria
• Retrospective policies on completed buildings where no warranty was arranged at the time

Lender Requirements: What Your Mortgage Lender Expects

If a mortgage or institutional funder is involved in the transaction, the funder’s requirements will often determine which product is needed — and sometimes which specific providers are acceptable.

For residential new builds, mainstream UK mortgage lenders typically require a structural warranty from a provider on their approved panel. The UK Finance Mortgage Lenders’ Handbook lists accepted warranty providers, and not all warranty providers are accepted by all lenders. Before committing to a warranty provider, confirm that they are on the panel of lenders likely to be used by your buyers.

For commercial and mixed-use developments, lenders and investors typically specify their own requirements in the financing documentation. These requirements vary and may include specific minimum cover periods, sum insured indexation provisions, named insurer requirements, and wording conditions. Reviewing the funder’s requirements before selecting a policy is essential — changing cover after a policy is issued can be difficult and costly.

Cost: What Drives the Premium?

For residential structural warranties, premium is typically expressed as a fixed fee or percentage of contract value, with providers competing on price and cover quality. The factors that most influence cost include the contract value, the development type, the contractor’s track record and accreditation, the construction methodology, and whether the site has any specific risk characteristics such as flood risk or a history of contamination.

For commercial latent defects insurance, premium is individually underwritten and varies more significantly based on the complexity of the scheme, the construction methodology, the design team’s experience, and the policy terms required by funders. Premiums are typically quoted as a percentage of gross internal area or rebuild cost. The range is wide — a straightforward commercial development by an experienced developer will attract a more competitive premium than a complex mixed-use scheme with non-standard construction methods.

In both cases, arranging cover early in the project — before construction begins — gives access to the full market and typically results in better terms than late or retrospective applications. Insurers can also carry out inspections during construction, which not only supports the cover but can identify issues before they become expensive post-completion problems.

Can You Have Both?

Yes, and on some projects it makes sense. A mixed-use development with residential units and ground-floor commercial space, for example, may need a residential structural warranty for the residential element and a commercial LDI policy for the commercial floors. The two policies would be coordinated to ensure there are no gaps or overlaps in coverage between the different uses.

For large residential developments where the developer is retaining some units and selling others, the structure of cover may differ between the retained and disposed-of elements. Retained assets managed for long-term income generation may benefit from the more flexible terms available under a commercial LDI policy, even where the underlying use is residential.

Getting the structure right on mixed or complex developments requires specialist advice — the standard residential warranty route and the commercial LDI route have different insurers, different policy formats, and different inspection and certification processes.

Still have questions? Contact us to discuss bespoke bond options for your next development.

Disclaimer:

This blog is intended for general informational purposes only and should not be interpreted as insurance advice, a financial recommendation, or a substitute for professional consultation. While care has been taken in compiling the information, Compariqo makes no representations or warranties as to its accuracy or completeness. Insurance products, terms, and eligibility criteria may vary and are subject to underwriting. Readers should seek appropriate independent advice before making any decisions.

Compariqo is a trading style of Exance Services Limited, which is authorised and regulated by the Financial Conduct Authority under firm registration number 300804. Exance Services Limited is registered in the United Kingdom under company registration number 03366581.