Handover & Completion · Best Practice · Completion

Structural Warranty Certificate

A structural warranty certificate providing long-term insurance cover for structural defects (typically 10-12 years).

Last reviewed: 29 March 2026 — This guide reflects UK law as of this date. NHBC / BBA / Contract remains current with no amendments enacted as of 29 March 2026. Next scheduled review: 29 March 2027.

Legal basis	NHBC / BBA / Contract
Status	Best practice — required by mortgage lenders on new residential
Typical cover	10 years (2 years builder + 8 years structural)
Market share	NHBC covers ~80% of UK new homes

1. Structural Warranty — Essential Protection for New Residential Buildings

A structural warranty certificate is the fundamental quality assurance document for new residential buildings in the United Kingdom. It provides the homeowner with protection against defects in the structure of the building for a defined period, typically ten years from the date of completion. Mortgage lenders require a structural warranty to be in place before they will release funds on a new-build property, making it an essential document in the completion process.

The most widely recognised structural warranty in the UK is the NHBC Buildmark policy, which covers approximately 80% of all new homes. Other providers include LABC Warranty, Premier Guarantee, Checkmate, and Protek. Regardless of provider, the warranty operates on a similar basis: the developer registers the plot before construction starts, the warranty provider inspects the property at key stages during construction, and a warranty certificate is issued at completion confirming that the property has been built to the required standard.

The NHBC process requires the developer to register each plot before work commences. NHBC inspectors then carry out inspections at key construction stages, including foundations, drainage, superstructure, and pre-completion. If the property meets NHBC Technical Standards, the Buildmark policy is issued at completion. The policy provides two years of builder warranty cover (during which the builder is responsible for remedying defects) followed by eight years of structural guarantee cover provided directly by NHBC.

Register with your structural warranty provider before construction starts — not when you're trying to complete. Late registration can delay completion, prevent mortgage release, and may result in retrospective inspections that add cost and time. The warranty provider needs to inspect the property during construction to provide the cover — they cannot retrospectively certify work that has already been covered up.

2. What the Certificate Contains

The structural warranty certificate confirms the key details of the warranty cover provided for the property. Each section of the certificate serves a specific purpose and should be checked carefully at handover.

Field	What to check
Property details	The full postal address and plot number of the property covered by the warranty. Confirm that the address matches the property being handed over and that no errors exist in the plot identification.
Developer	The name of the developer or builder who constructed the property and who is responsible for the builder's warranty period. Confirm that this matches the contractual developer entity.
Warranty provider	The name of the warranty provider (e.g. NHBC, LABC Warranty, Premier Guarantee). This is the organisation that underwrites the structural guarantee period and administers claims.
Policy number	The unique policy or registration number for this property. This number is required when making any claim or enquiry and should be retained securely with the property records.
Date of issue	The date on which the warranty certificate was issued. The warranty periods typically run from this date or from the date of legal completion, whichever is specified in the policy terms.
Builder's period	The period (typically the first 2 years) during which the builder is directly responsible for remedying defects in the property. During this period, claims are directed to the builder, not the warranty provider.
Structural guarantee period	The period (typically years 3 to 10) during which the warranty provider covers the cost of remedying structural defects. Structural defects are defined in the policy and typically include damage caused by defective design, workmanship, or materials in the structure, foundations, and weatherproofing.
What is covered	A summary of what the warranty covers and any exclusions. Structural warranties do not cover everything — items such as landscaping, fencing, cosmetic finishes, and wear and tear are typically excluded. Read the policy terms carefully.
How to make a claim	The procedure for making a claim under the warranty, including contact details for the warranty provider's claims department. Claims during the builder's period are directed to the builder; claims during the structural guarantee period are directed to the warranty provider.
Transfer on sale	Confirmation that the warranty transfers automatically to subsequent purchasers of the property within the warranty period. Most structural warranties transfer automatically without the need for notification, but the policy terms should be checked.

3. Common Mistakes

Not registering before construction starts

The warranty provider must inspect the property during construction in order to issue the warranty certificate at completion. If the developer does not register the plot before construction starts, the warranty provider will not have inspected the foundations, drainage, or superstructure. Retrospective registration is possible with some providers but involves additional cost, delay, and intrusive investigations to verify work that has already been covered up. In some cases, retrospective registration is refused entirely.

Not giving the inspector access at key stages

Structural warranty inspections are carried out at defined key stages during construction. If the developer proceeds past a key stage without giving the warranty inspector the opportunity to inspect, the inspector may require that work is opened up for retrospective inspection, or may impose conditions on the warranty cover. Missing inspections delays the issuance of the warranty certificate and can create problems at completion.

Not including the warranty certificate in the handover pack

The structural warranty certificate is one of the most important documents in the handover pack for a new residential property. Without it, the buyer cannot demonstrate to their mortgage lender that the property has warranty cover, and future purchasers will not have evidence of the structural guarantee. The certificate must be included in the handover documentation along with clear instructions on how to make a claim.

Not understanding the difference between the builder's period and the structural guarantee period

Many homeowners do not understand that the first two years of a structural warranty are covered by the builder, not the warranty provider. During the builder's period, claims for defects must be directed to the builder. Only if the builder fails to remedy the defect, or if the builder has become insolvent, does the warranty provider step in during the builder's period. During the structural guarantee period (years 3 to 10), claims are made directly to the warranty provider, but only for structural defects as defined in the policy.

Confusing a structural warranty with product warranties

A structural warranty covers the structure, foundations, and weatherproofing of the building. It does not cover individual products, appliances, or components such as boilers, kitchens, windows, or bathroom fittings. These items are covered by separate manufacturer or installer warranties. The structural warranty and product warranties are entirely separate documents with different terms, durations, and claims procedures. Both should be included in the handover documentation.

4. Frequently Asked Questions

What does NHBC Buildmark cover?▾

NHBC Buildmark provides cover in three stages. Before legal completion, it provides protection if the builder becomes insolvent and cannot finish the property. During the first two years after legal completion (the builder's warranty period), the builder is responsible for remedying defects that breach NHBC Technical Standards. During years 3 to 10 (the structural guarantee period), NHBC provides direct cover for damage caused by defects in the design, workmanship, or materials of the structure, including foundations, load-bearing walls, external render, roof structure, and weatherproofing. Cosmetic defects, wear and tear, landscaping, and shrinkage are not covered during the structural guarantee period.

Does the warranty transfer when the property is sold?▾

Yes. Most structural warranties, including NHBC Buildmark, transfer automatically to subsequent purchasers of the property within the warranty period. There is no need to notify the warranty provider or pay a transfer fee. The new owner benefits from the remaining term of the warranty. This is one of the key advantages of a structural warranty — it protects not just the first buyer but all subsequent owners within the ten-year period. The original warranty certificate should be passed to the new owner as part of the property sale.

What are NHBC Technical Standards?▾

NHBC Technical Standards are the detailed technical requirements that builders registered with NHBC must meet when constructing new homes. They cover all aspects of residential construction, including foundations, walls, roofs, floors, services, drainage, and external works. The standards are updated regularly to reflect changes in building regulations, industry best practice, and feedback from claims data. NHBC inspectors assess construction against these standards during their key stage inspections. Non-compliance with NHBC Technical Standards can result in remedial work being required before the Buildmark policy is issued.

Can I get a structural warranty for a self-build project?▾

Yes. Several warranty providers offer structural warranty policies specifically designed for self-build projects. These include LABC Warranty, Premier Guarantee, Protek, and others. The self-build warranty operates in a similar way to a developer warranty: the project must be registered before construction starts, inspections are carried out at key stages during construction, and the warranty certificate is issued at completion. Self-build warranties are typically required by mortgage lenders who are providing self-build mortgages, and they are also valuable when the self-builder comes to sell the property, as future purchasers and their mortgage lenders will require evidence of warranty cover.

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