Construction all risk insurance is designed to protect building projects against physical loss or damage while works are in progress. It is one of the most widely used forms of construction insurance in the UK. However, it does not cover every possible scenario. Many disputes arise because policyholders assume broader protection than the policy wording actually provides. Understanding construction all risk insurance exclusions is essential before arranging cover, particularly on high value or complex projects.
Understanding Construction All Risk Insurance
Construction all risk insurance provides cover for physical loss or damage to works in progress, site materials, and sometimes temporary structures during the course of construction. It is commonly referred to as contractors all risk insurance or a CAR insurance policy. Depending on the structure of the policy, it may also include public liability protection as part of a wider construction project insurance arrangement.
Exclusions exist because insurers define and price specific risks. A construction all risk insurance policy is not intended to operate as a maintenance contract, a guarantee of workmanship or a substitute for professional indemnity insurance. The boundaries of cover are clearly set out in the wording. Understanding those exclusions is just as important as understanding what is insured.
Faulty Workmanship and Design Defects
One of the most frequently misunderstood construction all risk insurance exclusions relates to defective work and design responsibility.
Poor Workmanship
Most CAR insurance policies exclude the cost of correcting defective workmanship. If a contractor installs an element incorrectly, the cost of removing and replacing that defective work is usually not covered. However, damage resulting from the defect may be insured in certain circumstances. For example, if faulty installation causes damage to other parts of the project, the consequential damage may be considered, while the original defective element remains excluded. The distinction between the defect itself and resulting damage is critical.
Design Errors
Design defects are also commonly excluded under standard construction all risk insurance. Where the contractor is responsible for design, a separate professional indemnity policy is normally required. Some policies offer limited extensions for design risk, but these are not automatic and must be clearly agreed. Without appropriate cover in place, design failures can result in significant uninsured exposure.
Wear and Tear, Gradual Deterioration and Maintenance
Construction all risk insurance is intended to respond to sudden and unforeseen physical damage. It does not cover gradual processes. Common exclusions include corrosion, rust, rot, mould and long-term water penetration caused by poor detailing or lack of maintenance.
Policies also do not replace proper site management. Damage caused by neglect, failure to protect unfinished works or inadequate weatherproofing is often excluded. Site insurance cover expects reasonable precautions to be taken. Where those precautions are not followed, insurers may decline claims on the basis that the loss was preventable rather than accidental.
Mechanical and Electrical Breakdown
Breakdown of construction plant, tools or hired equipment is typically excluded from standard construction all risk insurance unless specifically insured under a separate plant policy. Internal mechanical or electrical failure of machinery is not usually covered under a basic construction project insurance arrangement.
If plant and equipment cover is required, it must be added as a specific extension or arranged under a dedicated policy. Assuming that all site equipment is automatically included can lead to unexpected gaps in protection.
Existing Structures and Surrounding Property
This issue becomes particularly important on refurbishment and extension projects.
Existing Buildings
Standard construction all risk insurance does not automatically include cover for existing structures. On refurbishment projects, damage to the original building may be excluded unless an extension for existing structures is added. This is one of the most significant construction all risk insurance exclusions for developers working on live or occupied properties.
Without specific agreement, insurers may limit cover to the new works only. Any loss affecting the existing building fabric could therefore fall outside the scope of the policy.
Neighbouring Property
Damage to third party property is not covered under the material damage section of a CAR insurance policy. Instead, it falls under public liability insurance. Confusion often arises where adjacent buildings are affected by site activity. Understanding the distinction between material damage to the works and third party liability is essential when structuring construction insurance.
Consequential Loss and Delay
Construction all risk insurance is designed to cover physical damage, not financial consequences.
Losses such as delay penalties, liquidated damages, loss of rent or loss of profit are usually excluded unless specific delay in start up or advanced loss of profits cover is added. These extensions are specialist and must be arranged deliberately as part of a broader construction project insurance strategy.
The difference between physical damage and consequential financial loss is one of the most important construction all risk insurance exclusions to understand. A policy may respond to the cost of repairing a damaged structure but not to the income lost while repairs are carried out.
Contractual Liabilities and Fines
Liabilities assumed purely under contract, beyond normal legal obligations, are often excluded. If a contractor agrees to accept wider responsibility than the law would otherwise impose, the additional liability may not be covered by standard construction insurance.
Fines, penalties and liquidated damages are also typically excluded. A CAR insurance policy is not designed to protect against contractual performance risk. It is focused on physical damage to insured works.
War, Terrorism and Cyber Risks
Most construction all risk insurance policies exclude war, terrorism and nuclear related risks as standard. Separate terrorism cover may be available but is not automatically included.
Cyber exclusions are also becoming more common. Even site insurance cover may exclude losses arising from cyber events, particularly where digital plant, automated systems or connected technologies are involved. As construction sites become more technology driven, understanding exclusions in construction insurance relating to cyber risk is increasingly important.
Why Understanding Exclusions Matters
Misunderstanding construction all risk insurance exclusions can result in uninsured losses, disputes with insurers and costly project delays. The cheapest premium often reflects narrower cover and broader exclusions. Without careful review of the wording, project stakeholders may assume protection that does not exist.
Early review of the policy, aligned with the project’s procurement route, contract terms and risk profile, is crucial. Construction all risk insurance should be tailored to the specific risks of the scheme rather than treated as a standard commodity purchase.
Get Construction Insurance Right from the Start
Construction all risk insurance provides valuable protection against physical loss or damage during works, but only within clearly defined limits. Understanding construction all risk insurance exclusions is just as important as understanding what is covered. Developers and contractors should review policy wording carefully and ensure that appropriate extensions are in place to avoid gaps in protection.
Speak to Buildsafe for expert guidance on arranging construction insurance that reflects the real risks of your project.
