NHBC Warranty Explained

If you've bought a new build home in the UK, there's a good chance it came with an NHBC Buildmark warranty. It's one of the most recognised protections for new homeowners, but many buyers don't fully understand what it covers, when it applies, and crucially, what to do if something goes wrong.

This guide gives a general overview of how the NHBC Buildmark warranty typically works, period by period. Always refer to your own policy documents for the specific terms that apply to your home.

What is the NHBC?

The National House Building Council (NHBC) is a not-for-profit organisation that sets standards for new-build construction and provides the Buildmark warranty, widely regarded as the most commonly used new build warranty in the UK. A large proportion of new-build homes are registered with the NHBC, though the exact share varies by region and developer.

The Buildmark warranty is not the same as home insurance. It's a structural warranty that protects you against specific defects and risks across different time periods after your home is completed.

The three warranty periods

What does the NHBC warranty cover?

• Defects in the structure of the home that fail to meet NHBC Technical Standards
• Physical damage caused by a defect in the structure
• Contaminated land (where the NHBC was not made aware before construction)
• Loss of deposit if the builder becomes insolvent before completion
• Emergency costs if your home becomes uninhabitable due to a covered event

What isn't covered?

• Normal wear and tear: paint fading, minor shrinkage cracks, and general ageing
• Damage caused by you or your tenants
• Anything excluded from the NHBC Technical Standards
• Consequential losses such as the cost of alternative accommodation (terms and exceptions apply)
• Defects in items not built by the registered builder (e.g. a garage added later)
• Issues that were known about and accepted at the time of purchase

How to make an NHBC claim

In years one and two, your first step is always to report the defect in writing to your builder. Keep a clear record of what you reported and when. The NHBC's resolution service only gets involved if your builder doesn't respond, refuses to fix the issue, or you disagree about what's covered.

From year three onwards, you contact the NHBC directly. They'll assess the defect and, if it's covered, arrange and fund the repair. You can reach them through their claims line or via their website.

How to protect yourself during years 1–2

The builder warranty period is where many homeowners miss out. This is often not because the warranty doesn't exist, but because defects weren't documented properly or weren't reported within the right window.

The most important thing you can do is snag your property thoroughly as early as possible, ideally before you move in, and report every defect in writing with photos and clear descriptions. A verbal conversation is not enough. You need a timestamped paper trail.

Final thoughts

The NHBC Buildmark warranty is a valuable protection, but only if you understand it and use it. Most homeowners never need to go beyond the builder warranty period, which means the first two years are the most critical time to stay on top of your snagging and report issues properly.

Document everything. Report everything in writing. Formal written notification is needed before any warranty obligation is triggered.

Disclaimer: This guide is for general information only and does not constitute legal or professional advice. Warranty terms, rights, and timelines vary by provider and individual circumstances. Always refer to your own policy documents and seek independent advice if you are unsure about your specific situation.