How to secure structural warranties for new builds

To sell a new-build home or a major conversion in the UK, you must secure a structural warranty from a provider like NHBC, LABC Warranty, or Premier Guarantee before you start work on-site. This 10-year insurance policy protects the buyer against structural defects and, crucially, is a mandatory requirement for almost every UK mortgage lender. Without it, your pool of potential buyers will be limited to cash-only investors.

Why structural warranties are essential

While building regulations ensure a property is safe and energy-efficient, a structural warranty (often called "latent defects insurance") goes further. It covers the cost of repairing major structural damage caused by faults in design, materials, or workmanship for 10 years after completion. For you as a developer, it provides a professional "stamp of approval" and shifts the financial risk of major structural failures away from your business and onto the insurer.

Steps to secure your warranty

1. Choose a provider: Research the main UK providers. NHBC is the best-known, but LABC Warranty (working with Local Authority Building Control) and Premier Guarantee are also widely accepted by lenders.
2. Apply before you build: You must register the project before any work begins on-site. Applying late can lead to significantly higher premiums, or providers may refuse to cover the "hidden" elements like foundations that they couldn't inspect.
3. Technical Audit: The provider will review your architectural plans and structural calculations to ensure they meet their specific technical standards (which are often stricter than standard Building Regulations).
4. Site Inspections: Once construction begins, the warranty provider will send surveyors to site at key stages. Typical inspection points include:
   • Foundations and excavations
   • Damp-proof course (DPC) and floor construction
   • Superstructure (walls and lintels)
   • Roof structure and weatherproofing
   • Pre-plastering (first fix)
5. Final Certificate: Once the build is finished and the surveyor is satisfied, you will receive a 10-year insurance certificate to hand over to the buyer's solicitor during the sale.

Tip: Don't confuse Building Control with a Structural Warranty. Even if a Building Control officer has signed off your work, you still need a separate warranty surveyor to visit the site to validate your insurance.

Best practices for new developers

Action	Benefit
Apply Early	Avoids "uninsurable" foundations and keeps premiums lower.
Maintain Records	Taking photos of covered work (like drainage) helps if a surveyor misses a visit.
Check Lender Lists	Ensure your chosen provider is on the "Council of Mortgage Lenders" (CML) approved list.

If you are a first-time developer, be prepared for the provider to ask for a "developer's bond" or an upfront security deposit. This is common practice until you have a proven track record of high-quality builds.