New Build Warranty Claims: How NHBC Buildmark Cover Actually Works

The "10-year warranty" that isn't one warranty

New-build buyers are routinely told their home comes with "a 10-year NHBC warranty," which creates the impression of comprehensive, consistent protection for a full decade. In reality, NHBC's Buildmark policy (the most common new-build warranty in the UK, though Premier Guarantee and LABC Warranty are also widely used) is really two very different products stitched together, and the level of protection drops sharply after the first two years.

Years 1-2: the builder's warranty period

For the first two years after legal completion, the developer/builder, not NHBC's insurance, is contractually obligated to put right defects that fail to meet NHBC's Technical Requirements. This covers a broad range of issues:

• Snagging items (poor finishes, sticking doors, minor defects)
• Workmanship faults not meeting NHBC standards
• Non-structural defects — plumbing, electrics, plastering, fittings
• Damp and condensation issues arising from construction faults

If the builder is slow or refuses to act, NHBC's Resolution service can be used to independently assess the dispute and, where justified, require the builder to remedy the defect.

Years 3-10: the structural insurance period

From year 3 onward, the nature of cover changes fundamentally. NHBC's insurance policy takes over, but it covers a much narrower category of problems — broadly, physical damage to the home caused by a defect in a structural element:

• Foundations
• Load-bearing walls
• Roof structure (not roof covering/finishes generally)
• Structural elements of staircases and floors

Cosmetic issues, general wear and tear, cladding or render finishes, non-structural leaks, and most of the items that would have been covered as "snagging" in years 1-2 are not covered by the structural insurance in years 3-10.

This is the single biggest source of homeowner disappointment with new-build warranties: a defect that would clearly have been fixed under the builder's obligation in year 1 may simply not be a valid claim if it first appears in year 4, unless it can be shown to stem from a genuine structural defect.

How to make a claim

1. Document everything — photograph the defect, note when it first appeared, and keep all correspondence.
2. Report promptly — delays can weaken your position, particularly close to the boundary between the builder's period and the insurance period.
3. Years 1-2: report directly to the builder/developer's customer care team in writing; escalate to NHBC Resolution if unresolved within a reasonable time.
4. Years 3-10: submit a claim directly to NHBC (or your specific warranty provider), who will assess whether the damage stems from a covered structural defect.
5. Keep the warranty documentation — the specific policy booklet issued at completion sets out the exact terms, exclusions and claim process for your build, and these can vary between providers and even between policy versions.

Common exclusions across new-build warranty providers

• Wear and tear, weathering and general maintenance issues
• Damage caused by the homeowner's own alterations or lack of maintenance
• Consequential loss (e.g. cost of alternative accommodation) beyond specified limits
• Landscaping, fencing and other non-structural external items, usually excluded or covered only briefly
• Issues arising from homeowner-installed extensions or alterations, unless separately certified

Not all new-build warranties are NHBC

While NHBC is the most widely used provider, Premier Guarantee and LABC Warranty are common alternatives, and each has its own specific terms, though the broad two-tier structure (short builder-responsibility period, longer narrower structural insurance period) is an industry-standard pattern. Always check your specific policy documents rather than assuming NHBC's exact terms apply.

Bottom line

An NHBC or equivalent new-build warranty is valuable, but its protection is front-loaded: the first two years give broad, builder-backed cover for most defects, while years three to ten shrink down to structural insurance for serious, load-bearing problems only. Understanding this split — and reporting any defects promptly, ideally while still within the stronger builder-responsibility period — is essential to getting full value from the warranty you've paid for as part of your new-build purchase.