INSURANCE GUIDE Self Build Insurance UK - cover for building your own home |
TL;DR
- Self build insurance covers the construction of a privately commissioned new home against structural damage, materials theft, public liability, and employers liability for workers on site.
- Standard home insurance does not cover a property under construction - specialist self build or site insurance is required from the first day on site.
- Self build insurance typically has three sections: site and materials cover (physical damage/theft), public liability (third-party claims), and employers liability (injury to workers).
- Most lenders offering self build mortgages require a structural warranty (such as NHBC Buildmark or a Premier Guarantee) alongside self build insurance.
- Annual premiums typically range from GBP 500 to GBP 2,000 for a standard self build depending on the build value and duration.
Last reviewed: June 2026
KEY FACTS | |
| What it covers | Site and materials (damage, theft), public liability (third-party injury/damage), employers liability (worker injury) |
| When required | From the first day of site preparation or groundworks - before any standard home insurance applies |
| Structural warranty | Separate 10-year structural warranty (NHBC, Premier, Checkmate) required by most lenders and recommended for resale |
| Employers liability | If any direct labour (individual workers, not subcontractors through their own business) is used, EL is compulsory |
| Lender requirement | Most self build mortgage lenders require site insurance and structural warranty as conditions of drawdown |
| Annual premium range | GBP 500 to GBP 2,000 for a standard self build project |
What Is Self Build Insurance?
Self build insurance (also called site insurance or self build and renovation insurance) covers the construction of a new home commissioned privately by the homeowner rather than by a developer. It covers the build from groundbreaking through to practical completion, protecting against the risks specific to construction - materials theft, structural damage, fire, and liability for injury to third parties and workers on site.
Standard buildings insurance is not appropriate during construction - a property under construction is not a completed building and the risks are fundamentally different. Self build insurance is the specialist product for this stage, transitioning to standard buildings insurance (and in many cases a structural warranty) when the build is complete and habitable.
KEY FACTS
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Key Sections of Self Build Insurance
Site and materials cover: Covers the partially-completed structure and building materials on site against fire, storm, flood, malicious damage, vandalism, and theft. Materials theft from construction sites is significant - bricks, timber, and copper are commonly targeted. The sum insured should reflect the estimated rebuild cost at practical completion plus the materials on site at any one time.
Public liability: Covers claims from members of the public, neighbouring property owners, and visitors to the site for bodily injury or property damage caused by the construction activities. Children accessing unsecured construction sites are a particular liability risk. PL limits of GBP 2 million to GBP 5 million are standard.
Employers liability: Compulsory where direct labour is used. Covers injury claims from workers on site. If working with a main contractor who employs their own workers, the contractor EL covers the workers. If engaging individual tradespeople directly on a self-managed basis, the self builder needs EL cover for them.
Structural Warranty
A 10-year structural warranty (from NHBC, Premier Guarantee, Checkmate, or similar providers) is a separate product from self build insurance. It is not construction cover - it covers defects in the completed building that emerge in the years after completion. Most self build mortgage lenders require a structural warranty as a condition of the mortgage, and it is also important for future resale as purchasers and their mortgage lenders will expect it.
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Disclaimer: This guide is for general information only. Kael Tripton Ltd is not authorised or regulated by the FCA. Always verify details with an FCA-authorised insurer or broker before purchasing. |
Frequently Asked Questions
When does self build insurance start?
Self build insurance should start on the first day of site activity - typically when groundworks or site clearance begins. Do not wait until the foundations are poured or the walls start to rise. Early stages including groundworks carry significant liability risk from excavations, and materials delivered to site need cover from day one.
Does self build insurance cover my existing home if I am building in the garden?
Self build insurance covers the new build project on the construction site. Your existing home should continue to be covered under your standard home insurance policy. Inform your existing home insurer that construction is taking place adjacent to your home - this is a material change in circumstances and may affect your existing policy terms. Some insurers cover both under a combined policy during the construction period.
Do I need a structural warranty and self build insurance?
Yes - they are different products covering different risks. Self build insurance covers the construction period risks (damage, theft, liability). A structural warranty covers defects in the completed building for 10 years after completion. Both are typically required by self build mortgage lenders and both serve important purposes for different phases of the project.
Does self build insurance cover my own injury on site?
Standard self build insurance does not cover personal accident or injury to the self builder themselves. Personal accident insurance is a separate product covering the self builder if they are injured while working on site. Given that self builders often carry out physical work on their own project, personal accident cover is worth considering alongside the standard self build site insurance.
What happens to the insurance when the build is complete?
Self build insurance terminates when the build reaches practical completion and is certified as habitable. At this point, standard buildings (and contents) insurance should be arranged. A structural warranty takes over for latent structural defects for the 10-year warranty period. Some self build insurers offer a transition to standard buildings insurance as part of the same product.
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