Understanding waivers of subrogation in construction contracts

By

Josh Krissansen

Last Updated May 28, 2026

By

Josh Krissansen

A waiver of subrogation is a contract clause that prevents an insurer from seeking recovery from another party after paying a claim.

In construction, these clauses are used to reduce disputes between project parties after a loss occurs. For the waiver to apply properly, the insurer usually needs to agree to it in the policy before a claim is made.

In this article, we explain how waivers of subrogation work in Australian construction, where they apply across contracts and policies, and how to assess them to protect margins and maintain delivery certainty.

What Is a Waiver of Subrogation?

In insurance, subrogation is an insurer’s right to recover money from the party responsible for a loss after paying a claim. In Australia, these rights are governed by the Insurance Contracts Act 1984 (Cth).

A waiver of subrogation prevents the insurer from taking that recovery action. If a claim is paid, the insurer agrees not to pursue other project parties for the loss, even where fault is clear.

For the waiver to apply, the insurer usually needs to agree to it in the policy before a claim occurs.

Two forms are commonly used in Australian contracts:

1. Specific waiver.

    Applies to a single contract or project. It must be explicitly listed in the policy or contract and is the more targeted of the two.

2. Blanket waiver.

   Applies automatically to all contracts or agreements that require one. It offers broader protection across a programme of work but typically comes at a higher cost, and availability depends on the insurer, policy type, and project risk profile.

In Australian construction contracts, waivers are often paired with a cross-liability clause. This provision treats each co-insured as if they hold a separate policy, allowing one party to claim for loss caused by another without triggering subrogation between them.

These clauses work together: the cross-liability clause enables claims between co-insureds, and the waiver prevents the insurer from recovering those payments from the party at fault.

How Does a Waiver of Subrogation Work in Australian Construction?

In Australian commercial construction, waivers of subrogation are a standard feature of project insurance arrangements.

They are built into AS 4000 (General Conditions of Contract) and AS 4902 (Design and Construct), with both forms anticipating that project insurance will include waiver endorsements.

The principal or head contractor typically requires all project participants to include a waiver endorsement in their insurance policies, most commonly across two lines: public and product liability, and contract works insurance. 

Workers' compensation waivers are also possible but are subject to the relevant state or territory scheme and the Safe Work Australia context, and may require separate consideration.

When a waiver of subrogation is in place, the insurer agrees not to pursue recovery from other project parties. If a loss occurs, the insurer pays the claim and the claim is resolved without cross-party litigation or programme disruption.

The waiver only activates after the insurer has paid a claim and must be formally endorsed onto the policy to have legal effect. A waiver referenced in a contract but not reflected in the policy endorsement will not provide protection when it is needed most.

Here’s an example of how this works in practice:

• A subcontractor accidentally damages a structural element during fitout on a commercial project delivered under AS 4000
• The head contractor's contract works policy responds and pays for the remediation
• Because the contract includes a waiver of subrogation, the insurer cannot pursue the subcontractor to recover that payment
• The cost is absorbed within the insurance arrangement, the relationship is preserved, and the project moves forward without litigation interrupting the programme

This is the core function of the waiver on multi-party projects: enabling insurance to resolve losses efficiently without triggering disputes over fault between project parties.

This means insurers can, in some circumstances, lose subrogation rights even without an explicit waiver clause, reinforcing the importance of clear contract wording and consistent insurance arrangements on construction projects.

Why Does a Waiver of Subrogation Matter for Contractors and Clients?

On a commercial construction project, attributing fault after an incident is rarely straightforward, with multiple parties working across shared site conditions.

Without a waiver of subrogation, an insurer that pays a claim has both the right and the incentive to pursue recovery from the party it considers responsible. That process takes time, generates legal costs, and can strain relationships between parties who need to keep working together.

A well-drafted waiver changes that dynamic by containing the financial impact of a loss within the insurance framework, rather than distributing it across the project team.

• Reduced Recovery Actions

  A waiver of subrogation reduces the likelihood of cross-party recovery actions after a covered loss, which can lower financial exposure for subcontractors.
  
  Depending on the contract terms, policy response, and endorsements in place, it can also limit the downstream disputes that would otherwise follow a significant claim.

• Preserved Business Relationships

  By removing the threat of insurer-initiated recovery actions, waivers help maintain the working relationships between principals, head contractors, and subcontractors that project delivery depends on. On long-programme or repeat-client work, this can be a material commercial consideration.

• Faster Claim Resolution

  Claims may resolve more quickly when insurers are not required to determine fault across multiple parties. The waiver allows them to pay and close, rather than pay and pursue recovery through litigation.
  
  For principals and head contractors, that speed can help protect programme certainty and reduce potential litigation exposure on multi-tier projects where fault is difficult to isolate.

What Should You Check Before You Sign?

Agreeing to a waiver of subrogation can shift more risk to the insurer by limiting its ability to recover costs. Insurers may account for this through higher premiums or, on higher-risk projects, by declining to offer the endorsement. Before signing any contract that includes a waiver requirement, it’s important to check the following.

• Policy Approval

  Confirm with your broker whether a waiver of subrogation endorsement is available for the relevant policy, and whether the contract requires a specific or blanket form. Some insurers require written consent or a formal endorsement before the waiver is valid, and not all carriers offer it across every policy type or project risk profile.
  

• Type of Waiver

  Identify whether the contract requires a blanket waiver, which covers all project participants automatically, or a specific waiver naming particular parties. Blanket waivers offer broader protection across a programme of work but typically come at a higher premium.

• Premium Impact

  Ask your broker how the waiver will affect your premium. Because the insurer loses recovery rights, many may increase the cost of cover to offset that exposure. Insurance pricing moves with market conditions, so it’s best to confirm current rates directly with your broker rather than relying on prior project benchmarks.

• Coverage Scope

  Verify that the waiver applies only to covered claims under the relevant policy and does not inadvertently affect unrelated incidents or separate policies. Confirm which policy lines are subject to the waiver, whether public liability, contract works, workers' compensation, or a combination.

• Contract Consistency

  Check that every party to the contract is operating under the same waiver terms, as inconsistent wording between the head contract and the subcontract can create coverage gaps and reduce the effectiveness of the waiver.
  
  Where a head contract requires waivers, consider flowing consistent insurance and waiver requirements down to subcontractors where appropriate, ensuring subcontract terms mirror head contract obligations and that any premium impact is reflected in tenders before execution.
  

• Endorsements and Evidence

  Confirm that all required endorsements are attached to the policy before signing. 
  
  In Australia, evidence of insurance is provided via a certificate of currency, but the certificate alone may not confirm the specific waiver wording. Keep the executed endorsement on file and verify the waiver terms in the policy itself rather than relying solely on the certificate.

How Do You Get a Waiver of Subrogation and How Much Does it Cost?

Waiver endorsement costs vary widely depending on the insurer, the policy line, the project risk profile, and whether the waiver is blanket or specific. High-value or complex projects may attract higher fees, and blanket waivers typically cost more than specific ones because they apply across all contracts rather than a single engagement.

Once you have confirmed pricing and coverage with your broker, the following steps can help you obtain the endorsement:

1. Identify the need for a waiver. Confirm whether the waiver is being requested by the client or head contractor, and whether it is a condition of the contract.
   
2. Review the contract terms. Understand what the contract specifically requires, including whether a blanket or specific waiver is needed, which policy lines are covered, and which parties are to be named.
   
3. Contact your broker. Engage your insurance broker early to confirm availability, cost, and any conditions the insurer may attach to granting the endorsement.
   
4. Submit a written request. Request the waiver in writing, providing details of the project, the contract requirements, and the reason the waiver is needed.
   
5. Await insurer assessment. The insurer will review the request and determine whether it can be accommodated within the existing policy terms. Premium adjustments or changes to coverage conditions may follow.
   
6. Obtain the endorsement. Once approved, the insurer will issue a formal endorsement incorporating the waiver into the policy. Attach the endorsement to your certificate of currency and provide both to the contracting party as evidence of compliance.
   
7. File and upload. Retain a copy of both the endorsement and the certificate and upload them to the project documentation system to support compliance tracking across the project lifecycle.

It is best to request waiver endorsements at the preconstruction or tender stage. On complex projects, insurers may require additional information before agreeing to modify the policy, and late requests can delay contract execution or leave parties on site without the required endorsements.

Understanding waiver risk before signing

A waiver of subrogation is a risk allocation decision that determines how financial losses are managed across a project when incidents occur. Understanding how the clause operates under Australian law, which policy lines it affects, and what to verify before signing can help protect both project relationships and commercial outcomes.

Written by

Josh Krissansen

82 articles

Josh Krissansen is a freelance writer with two years of experience contributing to Procore's educational library. He specialises in transforming complex construction concepts into clear, actionable insights for professionals in the industry.

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