, Building
A small developer in Chesterfield finishes four houses. Three sell quickly. The fourth buyer's solicitor asks for the warranty documents and the developer explains that he intended to sort it out at completion.
He cannot. Warranty providers inspect during construction, which means registration has to happen before work starts, not after it finishes. The buyer's lender will not lend on a new house without a warranty or an acceptable professional consultant's certificate. The sale falls through and the house sits until he finds a cash buyer at a discount.
It is two products in one document
A new home warranty, whether NHBC Buildmark, LABC Warranty, Premier Guarantee or one of the other providers, is usually described as a ten year warranty. That phrasing hides the structure that matters.
The first two years are the builder's responsibility. In that period, defects arising from a failure to build to the provider's technical standards are for the builder to put right. The warranty provider's role is to hold the builder to it, and to resolve disputes, typically through a resolution service and, if the builder fails or refuses, through cover that steps in.
The remaining eight years are insurance, and the cover is much narrower. It is structural. Load-bearing elements, foundations, load-bearing walls, roof structure, floors, staircases, and usually the waterproof envelope: roof coverings, and waterproofing to below-ground habitable space. Typically also cover for contaminated land and for certain specified risks such as double glazing units or chimneys, depending on the provider and the year of the policy.
What it does not cover in those eight years is most of what people complain about. Shrinkage cracking, condensation, wear and tear, decoration, minor cracking under the provider's threshold, appliances, drives and landscaping, and any defect the owner knew about and did not report.
There is usually an excess on the insurance period, and there is a maximum sum insured tied to the purchase price and often index-linked.
Registration comes before the foundations
This is the operational fact a developer has to build into the programme.
You register with a provider before work starts. The provider assesses you: your financial standing, your technical competence, your record. They register the plot. They then carry out a series of risk management inspections during construction, at stages broadly similar to the building control ones, and they can require work to be changed to meet their technical standards, which are their own document and are sometimes stricter than the Approved Documents.
At completion, the provider issues the cover note or insurance certificate that the buyer's conveyancer will want.
You cannot reasonably retrofit this. There are routes for completed buildings, usually requiring intrusive investigation by a surveyor and producing a different product at a higher price, and lenders vary in whether they accept them. The commercial answer is to register on day one.
The alternative for a one-off, often used for a self-build or a small conversion, is a professional consultant's certificate from a suitably qualified and insured professional who has monitored the build. Lender acceptance of those has narrowed over the years, and the certificate lasts six years rather than ten. Check what the likely lenders will accept before you rely on it.
Claims get refused for reasons you can anticipate
Warranty providers are insurers, and insurers decline claims that fall outside the policy. The pattern of refusals is consistent.
Reporting late. Most policies require defects in the builder period to be reported to the builder and the provider within the period, in writing. A defect noticed in month 22 and reported in month 26 is outside the builder period, and unless it is structural it is outside the insurance period too.
Wrong category. A crack is the classic. Shrinkage and settlement cracking in plaster is expected in a new house and is excluded. Structural movement is covered. Whether a particular crack is one or the other is exactly the argument, which is why providers publish crack width thresholds and why photographs dated over time are useful.
Not a defect in the original construction. Damage caused by the owner, by an alteration, or by failure to maintain, is excluded. So is condensation, which is often the owner's living pattern interacting with a very airtight new house, and which the industry has been poor at explaining to buyers.
Consequential loss. Cover is usually for putting the defect right, not for alternative accommodation, lost rent or distress, though some policies include limited amounts.
For a developer, the practical point is that the warranty does not remove your liability in the first two years. It is your money fixing the snags, and your reputation in the local market. The provider is there to make sure it happens.
Buyers have other protection alongside it. The Consumer Code for Home Builders and, for members of the newer scheme, the New Homes Quality Code with the New Homes Ombudsman Service, set requirements on how homes are sold and how complaints are handled. And the Defective Premises Act 1972 gives a right of action where a dwelling is not fit for habitation; the limitation period for those claims was extended by the Building Safety Act 2022, to 30 years retrospectively for completed works and 15 years going forward. A ten year warranty is not the outer limit of your exposure.
Build the warranty into the price, not into the margin
The cost of a warranty is a percentage of build cost or sale value, varying with the provider, the type of building and the developer's own record. A first-time developer pays more than an established one with a clean history, which is one of the reasons the first scheme is the hardest.
Three things save money over time. A clean claims record, because it is rated. Fewer inspection failures, because remedial work during construction is cheaper than remedial work after handover and repeated failures affect your standing with the provider. And a proper handover: a home user guide, the commissioning certificates, an explanation of ventilation and of drying-out, and a named contact for defects. A large share of first-year claims are misunderstandings that a good handover prevents.
Budget for the two year period as a real cost. A sensible provision per plot, held back rather than distributed, means the callbacks are funded rather than resented.
Where this shows up in the game
Housebuilders arrive in Business Baron with the Property & Construction Track, an add-on to the full game. The game keeps profit and cash apart, and money banked on a sale is not the same as money you get to keep. A house finished slightly better costs more now and less for the decade after.