Pillar Guide · Updated July 2026
New Build Snagging & Structural Warranty: A Practical Guide for 2026/27
Buying a brand-new home comes with a distinct set of protections that resale properties do not have — but also a distinct set of pitfalls. This pillar guide explains how to compile and submit a snagging list, the two-year builder defects period, how the 10-year NHBC Buildmark structural warranty and its competitors work, what the New Homes Ombudsman can and cannot do, and the practical steps to take if a developer will not fix reported problems.
What Is Snagging
Snagging is the process of identifying and recording defects in a new build home — usually finishing and workmanship issues rather than structural problems. Common examples include paint overspray, gaps around window and door frames, uneven flooring, sticking doors, poorly aligned kitchen units, damaged sanitaryware, and incomplete external landscaping. A "snag list" is simply the written and photographed record of these issues submitted to the developer for repair.
Snagging is distinct from the structural warranty. Snags are the developer’s direct responsibility to put right, typically at no cost, within the defects period that follows legal completion. Structural problems — subsidence, roof structure failure, foundation movement — are instead covered by the long-term structural warranty insurance policy, which runs separately and for much longer.
A typical new build inspection identifies anywhere from a handful to over a hundred individual snags, most of them minor. It is normal and expected — new build construction under UK site conditions rarely produces a completely defect-free handover, which is precisely why the defects period and warranty framework exist.
When to Inspect
The best time for an initial snagging inspection is within the first few weeks of moving in, once you have lived in the property long enough to notice issues that are not obvious on a first walk-through — doors that stick as they settle, damp patches after the first rain, or heating and ventilation problems. Some buyers also request a pre-completion inspection, which can allow snags to be fixed, or a retention to be agreed, before legal completion and full payment.
A second inspection nearer the end of the two-year defects period is worthwhile, since some defects — settlement cracks, seasonal condensation, or issues that only appear under specific weather conditions — take time to emerge. Submitting a consolidated list well before the two-year deadline, rather than at the very last moment, gives the developer a realistic chance to respond and reduces the risk of a dispute over whether an item was reported in time.
Keep dated written records (email, not just phone calls) and photographs of every issue as it is found and again once supposedly fixed, since disputes over whether a repair was completed satisfactorily are common.
The Builder’s 2-Year Period
Almost every UK new build warranty structure follows the same basic shape: the first two years after legal completion are the builder’s own responsibility for defects, and the warranty provider (NHBC or equivalent) acts as a backstop if the builder becomes insolvent or refuses to engage. From year three onward, the structural warranty insurance itself takes over, covering major structural defects for the remainder of the term (commonly to year 10).
Report snags to the developer’s customer care team in writing, keep a reference number for each complaint, and expect a defined response window under the developer’s own procedure (often set out in the New Homes Quality Code for members of that scheme). If the developer does not respond or the repair is inadequate, most warranty providers offer a formal resolution service that can be invoked before the two-year deadline expires — missing that deadline can mean losing the right to have the item covered at all, so it pays to act promptly rather than let a list accumulate unreported.
It is worth distinguishing genuine defects (the item does not meet the standard the developer promised or that building regulations require) from matters of taste or normal wear — developers are not obliged to fix cosmetic preferences that do not amount to a defect.
NHBC Buildmark Warranty
NHBC (National House Building Council) is the largest provider of new build structural warranties in the UK. Its flagship Buildmark policy typically runs for 10 years from legal completion, structured as: years 1-2, builder responsible for defects with NHBC resolution service available; years 3-10, insurance-backed cover for structural damage to load-bearing elements such as foundations, external walls, and roof structure.
Structural claims under Buildmark are subject to a policy excess, and cover is limited to defined categories of damage — general wear, cosmetic issues, and damage caused by the homeowner (for example, unauthorised alterations) are excluded. The policy is transferable: if you sell the home within the 10-year term, the remaining cover passes to the new owner, which is a material selling point for young properties and something conveyancing solicitors check as standard.
NHBC also inspects sites during construction under its own building standards, so its warranty carries a degree of quality assurance beyond simple insurance — though this does not eliminate the need for buyer-side snagging inspections, since NHBC site inspections are sample-based rather than exhaustive.
Alternative Warranty Providers
NHBC is not the only approved structural warranty provider. Others active in the UK market include Premier Guarantee, LABC Warranty, Checkmate, ICW (International Construction Warranties) and Build-Zone. All of these appear on mortgage lenders’ approved lists (administered informally through UK Finance guidance), meaning a warranty from any of them will generally satisfy a lender’s conditions for a new build mortgage.
Buyers do not usually get to choose the provider — it is selected by the developer before construction starts and is fixed for the life of the build. What does vary between providers is the level of the excess on structural claims, the precise definitions used for "structural damage," and the responsiveness of the claims and resolution service, so it is worth reading the policy booklet in full (available from the developer at exchange) rather than assuming all providers are equivalent.
If a mortgage lender rejects a particular warranty provider (rare, but it happens with smaller or newer providers), the developer may need to arrange a Professional Consultant’s Certificate as an alternative form of assurance, though this is uncommon on mainstream developments.
New Homes Ombudsman
The New Homes Ombudsman Service was established under the Building Safety Act 2022 framework to give buyers a free, independent complaints route against developers who are members of the New Homes Quality Board scheme. Since launch, membership has expanded to cover most large national housebuilders, and it is increasingly a practical requirement for developers wanting mainstream mortgage-lender acceptance.
Buyers must first exhaust the developer’s own complaints procedure before referring a case to the Ombudsman. Once accepted, the Ombudsman can investigate, order remedial work, require compensation up to defined limits, or require an apology. Its remit covers marketing, sales conduct, and after-completion customer service — including how snags were handled — but it does not replace the structural warranty for insurance-backed structural claims, which remain the responsibility of the warranty provider.
The Ombudsman scheme sits alongside existing routes such as Trading Standards and, for more serious or unresolved matters, the courts — it is generally the fastest and lowest-cost first step for a buyer whose developer has stopped engaging.
Escalating a Dispute
If informal reporting to the site or customer care team does not produce results, escalate in a structured way: (1) written complaint through the developer’s formal complaints procedure, with a clear reference number and deadline for response; (2) if unresolved and within the first two years, refer to the warranty provider’s resolution or dispute service; (3) if the developer is a member of the New Homes Quality Board, refer to the New Homes Ombudsman once the developer’s internal process is exhausted; (4) for serious safety issues, contact Trading Standards or the relevant local authority building control team.
Keep every piece of correspondence, photograph evidence before and after repairs, and note dates. A well-documented paper trail is by far the strongest factor in getting defects fixed promptly and, if necessary, in supporting a formal complaint or legal claim.
For structural claims made after year two, contact the warranty provider directly — these are handled as insurance claims rather than customer service complaints, and typically require a survey by a provider-appointed assessor before any repair work is authorised.
Costs and Mortgage Implications
A professional snagging survey typically costs £300-£600 depending on property size and inspector, and produces a detailed, photographed report that carries more weight with a developer than an informal buyer-compiled list. This is optional but widely recommended, particularly for buyers with limited construction experience.
Snagging and warranty status have no direct bearing on Stamp Duty Land Tax, which is calculated purely on purchase price. However, mortgage lenders require a valid structural warranty as a condition of lending on the majority of new builds, so a missing, expired, or invalid warranty can delay or block both an initial purchase and a future remortgage or resale within the 10-year term.
When reselling a new build within its warranty period, a solicitor will check the transferability of the remaining cover as part of conveyancing — buyers of young new builds should always confirm this before exchanging, since an invalid or lapsed warranty can be a significant obstacle to a smooth sale.