New Build Structural Warranties, NHBC Buildmark and What They Cover

What is a New Build Structural Warranty?

When you buy a newly built home in the UK, the developer is required by most mortgage lenders to provide a structural warranty, a form of insurance that protects the buyer if significant structural defects emerge after completion. The most widely recognised scheme is NHBC Buildmark, but several alternatives are accepted by lenders.

The warranty attaches to the property, not the original buyer. If you sell within the warranty period, the remaining cover transfers to the new owner, which is a material selling point and a contractual obligation to disclose.

NHBC Buildmark, How It Works

The National House-Building Council (NHBC) is the largest provider of structural warranties in the UK. Buildmark cover is divided into two distinct periods:

Year 1 and 2, The Builder's Period

During the first two years, the responsibility for defects lies primarily with the developer under consumer protection legislation. The NHBC cover acts as a backstop: if the developer fails to resolve defects, NHBC will step in.

Any defect that arises in this period, a sticking door, cracked plaster, faulty fitting, should be reported directly to the developer or their customer care team. Keep written records of all reports and responses.

Years 3 to 10, Structural Cover

From year three onwards, Buildmark provides insurance cover against defined structural defects, problems with foundations, load-bearing elements, or the weatherproofing of the external envelope. The developer's direct obligation expires; it is the NHBC insurer that responds to valid claims.

What Is Not Covered

Structural warranties do not cover everything. Common exclusions include:

• Normal wear and tear and maintenance obligations
• Cosmetic defects reported after year 2
• Damage caused by the owner's own alterations or neglect
• Issues arising from unusual ground conditions not identified at the design stage (in some circumstances)
• Consequential loss (damage to contents from a structural failure)

Alternative Warranty Providers

NHBC Buildmark is the dominant scheme, but lenders also accept warranties from providers including:

• Premier Guarantee (MD Insurance)
• LABC Warranty
• RICS-affiliated schemes

If you are purchasing a new build with a non-NHBC warranty, verify with your mortgage lender that the specific scheme is acceptable to them before exchange.

Snagging, Don't Confuse It With Warranty Cover

Snagging refers to identifying minor defects and incomplete items at or shortly after handover, cosmetic issues, poorly fitting doors, paint blemishes, unfinished joinery. Snagging is the developer's responsibility in year one but is separate from structural warranty cover. Commission an independent snagging survey before or shortly after completion to document defects for the developer to resolve.

Checking Warranty Status When Buying a Resale New Build

If you are buying a property that was originally sold as new build within the last ten years, the remaining structural warranty cover should transfer. Ask the seller to provide the original warranty documentation, and verify the remaining term and cover with the warranty provider directly. You can check the property's build date and original sale data on Property Passport UK, which displays HM Land Registry transaction history for every registered property in England and Wales.