If you are developing a new residential scheme, you will almost certainly be aware that you need a structural warranty. Most mortgage lenders will not lend on a new build property without an accepted warranty in place. Yet many developers encounter the term before they fully understand how structural warranties work in practice.
Here we explain the structural warranty process in plain language, from appointment and inspection through to claims. This is intended for developers at an earlier stage who need to understand what the product does before comparing providers or reviewing lender criteria in more detail. Before considering the process in more detail, it is useful to understand when a structural warranty may be relevant to a development. Read our guide, When Do You Need a Structural Warranty? for an overview of the project circumstances, funding considerations and ownership arrangements that may make long-term structural protection appropriate. For a deeper analysis of lender expectations and provider comparison, see our dedicated structural warranty guide.
What Is a Structural Warranty?
A structural warranty is an insurance-backed policy taken out by the developer of a new build property. It protects buyers and mortgage lenders against certain structural defects that may arise after completion.
In simple terms, it is a long-term protection policy that typically lasts 10 or 12 years from completion. If a qualifying structural defect appears during that period, the warranty provider may cover the cost of remedial works in accordance with the policy wording.
Understanding how structural warranties work starts with recognising that they are not ordinary building insurance. They are a form of latent defects insurance designed specifically for newly constructed properties.
Who Is Involved in a Structural Warranty?
A structural warranty involves several parties, each with a defined role.
The Developer
The developer arranges the warranty before or during construction. The policy is taken out in the developer’s name initially, but it is intended to benefit future buyers and lenders.
The Warranty Provider
The warranty provider is usually an insurer or underwriting entity that issues the policy. The provider also appoints surveyors or inspectors to carry out technical reviews during construction.
The Inspector or Surveyor
The warranty provider carries out technical inspections at key stages of construction. This may include design review, foundation inspection, superstructure stages and final completion inspection.
The inspection process forms a core part of how structural warranties work. It is designed to reduce the likelihood of defects and provide assurance to lenders.
The Lender
Mortgage lenders rely on structural warranties as evidence that the property meets acceptable technical standards. Most lenders will not lend on a new build without an accepted warranty.
The Buyer
The eventual buyer benefits from the warranty once the property is sold. The policy is assigned to the property, not the developer, and transfers on resale.
The Structural Warranty Process
Developers often ask: what is the process for getting a structural warranty? The structural warranty process typically follows several stages.
1. Application and Project Review
The developer applies to a warranty provider before or early in construction. The provider reviews:
- Project details and drawings
- Construction method
- Ground investigation reports
- Professional team credentials
This underwriting stage determines whether the provider is willing to offer cover and on what terms.
2. Design Review
Before work progresses significantly, the warranty provider’s surveyor reviews design information. This may include structural calculations, foundation design and waterproofing strategy.
The purpose is to ensure that the building is designed in line with recognised technical standards.
3. Site Inspections During Construction
The warranty provider carries out inspections at agreed key stages. These often include:
- Foundations
- Drainage
- Structural frame
- Roof structure
- Pre-plaster stage
These inspections are not a substitute for building control, but they operate alongside it. They form part of the structural warranty explained in practical terms: the provider monitors risk as the building is constructed.
4. Completion and Certificate
Once construction is complete and final inspections are satisfactory, the warranty provider issues a certificate of insurance.
This certificate confirms that the property benefits from a 10 or 12 year structural warranty from the date of completion.
What Does a Structural Warranty Cover?
One of the most common questions is: what does a structural warranty actually cover?
Cover is typically divided into two distinct periods.
Years 0–2: The Builder Period
During the first two years after completion, the builder is primarily responsible for rectifying defects. If defects arise due to non-compliance with building regulations or technical standards, the developer or builder is expected to remedy them.
If the builder becomes insolvent during this period, the warranty provider may step in, subject to policy terms.
Years 2–10 or 12: The Structural Period
From year two to year 10 or 12, the policy provides insurance-backed protection against defined structural defects.
Typically covered elements include:
- Foundations
- Load-bearing walls
- Structural frame
- Floors and roofs
- Certain elements of weatherproofing
The exact scope depends on the provider and policy wording.
This split between builder period and structural period is fundamental to understanding how does a building warranty work in practice.
What Is Not Covered?
Structural warranties do not cover every defect.
Common exclusions may include:
- General wear and tear
- Damage caused by poor maintenance
- Cosmetic defects
- Non-structural items such as finishes
- Mechanical and electrical systems
Do structural warranties cover all types of defects? The answer is no. They are focused on major structural and weathering defects that affect habitability or structural integrity.
How the Warranty Transfers
A key feature of structural warranties is that the policy is assigned to the property, not the developer.
When the first buyer purchases the property, the benefit of the warranty transfers automatically. On subsequent resale, the remaining term transfers again to the new owner.
This transferability is one reason lenders place such importance on structural warranties. It ensures continuity of protection throughout the 10 or 12 year term.
What Happens When You Make a Structural Warranty Claim?
If a defect arises, the owner or managing agent typically notifies the warranty provider in writing.
The provider will:
- Review the claim against the policy terms
- Appoint a surveyor or loss adjuster
- Assess whether the defect falls within cover
- Confirm the appropriate remedial action
If the defect is covered and the builder is no longer responsible or able to rectify it, the insurer will fund or arrange remedial works up to the policy limit.
Understanding what happens when you make a structural warranty claim helps clarify the insurance element of the product. It is not simply a certificate issued at completion, but a live policy capable of responding to defined risks.
Who Provides Structural Warranties in the UK?
Structural warranties in the UK are provided by a range of insurers and warranty specialists. Some operate with integrated building control services, while others focus solely on insurance-backed warranty products.
Developers should be aware that not all providers are viewed equally by lenders. Mortgage lender acceptance is a key consideration.
LBB compares the whole market so developers get the best terms, not just the first available policy. Access to multiple providers enables structured comparison of scope, financial strength and technical inspection standards.
For larger or commercial schemes, an alternative may be commercial latent defects insurance, which operates on similar principles but is tailored to commercial risk profiles.
Structural Warranty vs Building Insurance
A structural warranty is not the same as standard building insurance.
Building insurance covers insured perils such as fire, flood or storm damage. A structural warranty covers defects arising from design, materials or workmanship in defined structural elements.
Both may be required, but they respond to different risks. Understanding this distinction is central to a structural warranty explained in practical terms.
Why Lenders Require Structural Warranties
Most mortgage lenders will not lend on a new build without an accepted warranty. This is because lenders require protection against structural defects that could undermine property value.
The warranty provides assurance that:
- The property has been inspected during construction
- Major structural defects are insured for 10 or 12 years
- Cover transfers automatically to future owners
The connection between warranty acceptance and mortgage approval is direct. Without an accepted warranty, saleability may be severely restricted.
Understanding the Mechanics of a Structural Warranty
Grasping how structural warranties work requires looking at the full lifecycle: application, inspection, certification, transfer and potential claim.
They typically last 10 or 12 years from completion. Cover is split between a builder period in the first two years and a structural period running to year 10 or 12. The policy is assigned to the property and transfers automatically on resale.
For developers, the key decisions relate to provider selection, inspection coordination and lender acceptance. LBB compares the whole market so developers get the best terms, not just the first available policy.
If you are planning a scheme and want guidance on selecting and structuring structural warranties appropriate to your development, speak to LBB for whole-of-market advice.
