New Build Warranties
J3 Advisory Structural Warranty
A new build warranty is a 10 or 12 year insurance policy that protects against structural defects in newly constructed residential developments and is now a standard requirement for UK funders and mortgage lenders.
With more warranty providers active across the UK, developers are often presented with proposals that vary in underwriting strength, lender acceptance and technical approach, making early, informed selection essential to avoid delays at funding or sale.
The cost of a new build warranty is shaped by a small number of core underwriting considerations: the experience and claims history of the professional team, the developer’s financial standing, the stage of works at the point of enquiry, and the size, construction method and location of the scheme. Securing terms before work begins remains the most effective approach, opening access to stronger insurers, reducing technical friction and helping pricing more accurately reflect the project’s risk profile.
Developers should check that the limit of indemnity reflects the reinstatement cost and that the insurer offers A-rated capacity recognised by major lenders. The provider’s technical expertise and experience with similar developments are equally important.
Selecting the right warranty provider early can help avoid unnecessary technical queries and delays. Once full enquiry details and supporting documents are provided, developers can typically expect around four weeks from submission to the initial inspection, with larger or more complex schemes requiring a longer lead time. For an early indication of premium for your next development, our online new build warranty cost calculator offers a useful starting point before formal terms are sourced.
New Build Warranties
Independent advice shaped by funding, technical and delivery requirements
Developers often engage J3 Advisory before construction begins, allowing the new build warranty strategy to be considered alongside funding, procurement and construction programme. Early planning helps reduce technical underwriting queries, satisfy lender requirements and support a smoother route to practical completion.
As an independent adviser, we work across the UK’s leading new build warranty providers to identify the most appropriate solution for each development. We continue supporting projects throughout construction, coordinating technical information, managing warranty inspections and helping secure the warranty through to issuance.
Why use J3 Advisory?
Independent advice across the UK’s leading warranty providers
No two developments are the same, and neither are structural warranty providers. Different insurers have different technical appetites, underwriting requirements, inspection regimes and lender acceptance. Rather than promoting a single provider, J3 Advisory assesses each development on its own merits to identify the structural warranty that best aligns with the project’s technical, commercial and funding requirements.
Working with the UK’s leading A-rated warranty providers gives us the flexibility to recommend the insurer best suited to each scheme. Our role isn’t simply to arrange a policy- we help clients make informed decisions that reduce technical friction, satisfy lender requirements and support successful project delivery from planning through to completion.
Support through every stage
From placement through to warranty issuance
J3 Advisory remains involved throughout the construction programme, supporting clients through to Practical Completion and the issue of the warranty certificate.
We co-ordinate the technical information submissions, and outstanding underwriting requirements needed to achieve warranty sign-off, working closely with developers, contractors, surveyors, insurers and lenders throughout the process.
Our dedicated aftersales team monitors progress, resolves outstanding actions and keeps communication moving between all stakeholders, helping minimise delays as the project approach Practical Completion. Timely warranty sign-off is often critical to sales, refinancing and the release of development funding, making proactive coordination an important part of successful project delivery.
New build warranty FAQs
Everything you need to know before getting started.
What is a new build warranty?
A new build warranty, also known as a structural warranty is an insurance policy that covers certain defects and issues in newly constructed properties. It typically covers structural defects and may also include other components like roofs and windows. For a comprehensive overview, visit our structural warranties page
Who provides new build warranties?
Every warranty provider offering new build warranties is required to commit to a consumer code. This code safeguards consumers throughout the sales process and provides a mechanism for resolving disputes in case of any complications. Some providers operate within Consumer Code for Home Builders. However, since October 2022, prominent developers have opted to enroll their projects in the New Homes Quality Code, an alternative program.
What does a new build warranty cover?
New build warranties generally cover structural defects that occur within a specific time frame after construction (Generally 10 or 12 years). This may include issues like foundation problems, load-bearing walls, and other major structural elements.
Can the warranty be transferred to a new owner if the property is sold?
New build warranties are transferable to subsequent owners, which can add value to the property when it is sold.
What is excluded from a new build warranty?
Exclusions can vary, but common items not covered by new build warranties may include general wear and tear, cosmetic issues, and issues caused by homeowner negligence.
Is there a deductible for warranty claims?
Some warranties may have a deductible, which is the amount the homeowner is responsible for before the warranty provider covers the rest of the costs.
What happens if the developer or contractor goes out of business?
Your new-build warranty will remain unaffected even if your developer or contractor goes bust. However, in the event that the insurer responsible for your warranty faces insolvency, another insurer may need to step in. It’s important to note that you may be responsible for the cost of obtaining the new coverage.
Click here to read our checklist when selecting the new build warranty provider.
Do new build warranties impact a mortgage application?
A new build warranty is essential to the mortgage process, and lenders will require a policy is in place for properties that are up to 10 years old. For older properties, lenders will usually ask to see evidence of a warranty even if it’s expired.