14 July 2026
Full rewrite to bring page up to date
15 July 2025
First Published
If you are buying a newly built or newly converted home, you will almost certainly see NHBC stamped all over your mortgage and legal documentation. Established in 1936, the National House Building Council (NHBC) is the UK's leading provider of structural warranties, safeguarding roughly 80% of all newly built homes in the country.
It is highly critical to understand that NHBC is not a standard home insurance provider. You cannot contact them to buy standard contents protection, accidental damage cover, or fire and theft policies. Instead, they provide Buildmark - a specialised, 10-year structural warranty and insurance policy that protects you against builder insolvency, structural construction defects, and land contamination. Most mortgage lenders will not release funds for a new-build property unless a warranty like Buildmark is actively in place.
You can get independent advice and a personalised quotes comparison for standard buildings and contents insurance to run alongside your NHBC warranty from one of our expert advisers below:
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You can use our expert advisers to compare home insurance deals from providers across the market.
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How the NHBC Buildmark Model Works
The Buildmark policy is not a static 10-year insurance policy. Instead, it is a modular, three-phase framework that shifts legal and financial responsibility as your property ages:
The Three Phases of Buildmark Protection
|
Phase |
Timeframe |
Cover Provided |
Who is Responsible? |
|
Phase 1: Pre-Completion |
From Exchange to Completion |
Protects your exchange deposit (up to 10% or £100,000, whichever is lower) or extra costs to finish building if the builder goes insolvent. |
NHBC |
|
Phase 2: Builder Warranty |
Years 1 and 2 post-completion |
Covers physical construction defects (e.g., cracked walls, faulty drainage, internal stairs, render, and plumbing issues). |
The Builder (Backed by NHBC's independent dispute resolution service) |
|
Phase 3: Structural Insurance |
Years 3 to 10 |
Direct insurance cover against structural defects affecting foundations, load-bearing walls, chimneys, roofs, and drainage. |
NHBC |
NHBC Warranty vs. Standard Buildings & Contents Insurance
It is a common and highly dangerous mistake to assume that having an NHBC warranty means you do not need standard buildings and contents insurance. You must run both in parallel to ensure your property is completely protected:
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The NHBC Buildmark Scope: This is a defects policy. It only pays out if the structural parts of your home fail because your builder did not construct them to NHBC's Technical Requirements.
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The Standard Home Insurance Scope: This is a perils policy. It covers immediate physical damage caused by unpredictable external events such as fires, explosions, storms, flooding, burst internal pipes, or criminal vandalism.
How NHBC Calculates Claims and Limits
Because the builder or developer pays the initial registration and inspection fees to secure the NHBC certificate, homeowners pay nothing upfront for this 10-year policy. However, any claims you submit are subject to highly specific financial calculators:
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Financial Claims Ceilings: The maximum total payout under an NHBC policy is typically capped at the original purchase price of the home, up to a maximum limit of £1 million for newly built homes and £500,000 for newly converted properties. These limits increase by roughly 5% each year to match rising material and construction inflation.
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The Minimum Claim Value (MCV): NHBC does not use a standard policy excess where you must pay the first £100 or £250 of a claim. Instead, they apply a Minimum Claim Value (MCV) to Phase 3 claims. This is an all-or-nothing threshold (often sitting around £1,900 to £2,000).
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If repairs cost £1,800 (under the MCV): NHBC will decline the claim entirely and you must pay for it.
-
If repairs cost £2,500 (above the MCV): NHBC will approve the claim and cover the entire £2,500 in full, requiring £0 contribution from you.
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Pros and Cons
Here is a look at the pros and cons of having your property protected under the NHBC Buildmark framework:
NHBC Buildmark Warranty
Pros:
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Highly Trusted by Lenders: Virtually all UK mortgage providers accept and actively prefer NHBC warranties, making the mortgage approval process much smoother.
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Fully Transferable: The policy stays attached to the brick and mortar, not the homeowner. If you sell the property within the 10-year window, the remaining cover transfers to the next buyer.
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Pre-Completion Deposit Protection: Offers exceptional safety for off-plan buyers, protecting your hard-earned exchange deposit if the builder goes bankrupt before completion.
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Alternative Accommodation Included: If structural works mean you cannot physically live in the home during repairs, NHBC covers the reasonable cost of storage and temporary relocation.
Cons:
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Strict Exclusions: Does not cover general wear and tear, thermal shrinkage cracks, poor garden landscaping, or any home extensions or alterations built after completion.
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The MCV Hurdle: Small structural defects that fall under your policy’s Minimum Claim Value will be declined, leaving you to fund minor repairs out of pocket.
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Not a Snagging List Guarantee: NHBC will not step in during the first 2 years to fix minor cosmetic snags unless they represent a direct breach of their Technical Requirements.
Customer Service and Claims Handling
Because the Buildmark policy spans a decade, your points of contact and resolution steps change depending on your property's age:
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The Dispute Resolution Service (Years 1 & 2): If your builder refuses to fix valid construction defects or goes insolvent during the initial 2-year window, you contact NHBC's dedicated resolution team. They will inspect the property, issue an action report to the builder, and directly fund and coordinate the repairs if the builder fails to comply.
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Direct Insurance Claims (Years 3 to 10): After Year 2, you bypass the builder entirely and submit claims directly to NHBC. You will need to provide photographic evidence, survey details, and structural reports to initiate an assessment.
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Shared Property Claims (Blocks of Flats): If you live in a block of flats with shared structural elements (like communal roofs or foundations), the MCV is calculated collectively across the block. For example, in a block of four flats, the structural issue must exceed the combined MCV of all four units to trigger a payout.
Sourcing standard home insurance to run alongside NHBC
While your NHBC warranty handles major structural failures, you are legally required to put standard, comprehensive buildings and contents insurance in place to cover everyday hazards like fires, storms, accidental damage, and theft.
When sourcing your parallel home insurance quote, be sure to declare to your insurer that the property is a new-build covered by an active NHBC warranty. Many high-street insurers offer significant new-build discounts on standard home premiums because modern construction methods, updated plumbing systems, and enhanced structural security reduce their overall hazard risk.
At Money Helpdesk, our independent property specialists can help you structure standard coverage that aligns perfectly with your NHBC-backed home. Get in touch today, and we will find the ideal policy for your new-build property - get started here.
No. An NHBC warranty is a specialist defects policy covering structural failures caused by builder non-compliance. It does not cover damage from fires, storms, flooding, theft, or accidental household damage, meaning you must still purchase standard home insurance.
The MCV is a threshold applied during the insurance-only phase (years 3 to 10). If the repair cost of a structural issue is lower than this value, NHBC will not cover it. If it is higher, they pay for the repair in full with no excess to pay.
Yes. The 10-year Buildmark policy remains attached to the physical property. If you sell your new-build home, the remaining years of cover automatically transfer to the new owner, making the property highly attractive to future buyers.
No. Standard plaster shrinkage and minor hairline cracks caused by the natural drying-out process of a brand-new home are completely excluded from the warranty, as they are considered part of standard home maintenance rather than structural defects.