Design and Construct Insurance: Covering the Dual Role
Design and construct insurance requires a review of both construction activities and professional design responsibilities. Check how each policy responds to the work your business performs or subcontracts. Discuss construction insurance and professional indemnity insurance together with ABS before relying on the cover.
For a design and construct (D&C) contractor, design liability and construction liability sit with the same entity. A well-structured insurance programme must close the gap between them.
Design and construct insurance: understand the dual role
Under a design and construct contract, a single contractor takes on responsibility for both designing and building the project. The principal engages one party, and that party delivers the completed asset, from concept and documentation through to physical construction and handover.
In traditional construct-only delivery, the principal's consultant team produces the design, and the builder's role begins once drawings are finalised. Design liability sits with the architect or engineer; construction liability sits with the builder. In a D&C arrangement, that separation disappears. If a structural element fails because the design was inadequate, the D&C contractor cannot point to a separate designer. Both obligations flow back to the same entity under the same contract.
This single-point responsibility is why D&C contracts are popular with principals: one party to hold accountable. For the contractor, it means accepting a scope of liability broader than most builders carry under a standard construction contract. The model appears across commercial, industrial, and civil projects, including fit-out, warehouse construction, and medium-density residential.
Why Does the Dual Role Create a Unique Insurance Gap?
A standard builder's insurance programme is built around physical risk. Contract works cover protects the works under construction, public liability responds to third-party injury or property damage, and workers compensation covers the workforce. All of these are oriented toward what happens on site.
Professional indemnity (PI) insurance covers a different category of risk. It responds when a claim arises from a professional error, omission, or negligent act in the provision of a professional service, in this context, the design. If a D&C contractor's design contains an error that causes the completed building to perform below the required standard, that is a PI claim, not a construction claim. The two policy classes do not naturally overlap and are often written to exclude each other's territory.
A standard public liability policy will typically include a professional services exclusion, which removes cover for claims arising from the provision of professional services such as design. The insurer is pricing construction risk, not design risk, and the exclusion reflects that. A D&C contractor who relies solely on their public liability policy for design-related claims will find that exclusion applies precisely when they need cover most.
Contract works policies have their own version of this problem. A faulty design exclusion (sometimes described as a faulty workmanship or faulty design clause) will generally exclude the cost of rectifying defective design from the insured works. The policy may still respond to resulting damage, physical damage caused by the design error, but the underlying design defect itself is excluded from rectification cover.
This creates a gap between the two policy classes. The PI policy covers the design error. The contract works policy may cover resulting physical damage but not the design rectification. The public liability policy excludes professional services altogether. For a contractor who holds both roles, these exclusions can leave significant exposure uncovered.
Design errors are often latent defects, not discovered until years after construction. A D&C contractor who has not maintained PI cover after practical completion may find a claim arising well outside their policy period. Closing this gap requires the PI, contract works, and public liability policies to be reviewed together, not arranged in isolation.
What Types of Cover Does a Design and Construct Insurance Programme Include?
A complete programme for a D&C contractor typically draws on several policy types. Each covers a distinct category of risk, and they need to work together without leaving gaps between them.
Contract works insurance (also called construction all-risks or course of construction cover) protects the physical works during the construction period. It covers accidental loss or damage to the structure being built, materials on site, and temporary works. See Construction Works Insurance and Course of Construction Cover for a detailed breakdown of how this cover operates. For a D&C contractor, the contract works policy needs to be reviewed alongside the PI policy to understand how the faulty design exclusion interacts with any resulting damage cover.
Public liability insurance covers third-party claims for bodily injury or property damage arising from the contractor's construction activities. On a D&C project, the public liability policy must be checked for a professional services exclusion. If that exclusion is present and not addressed, design-related claims that result in third-party loss may not be covered. For a comparison of how public liability and professional indemnity cover different risks, see Professional Indemnity vs Public Liability: Key Differences.
Professional indemnity insurance is the policy class that addresses design liability directly. It covers claims arising from errors, omissions, or negligent acts in the provision of professional services, including design work performed by the contractor or their design consultants. For a D&C contractor, PI cover is not optional. It is the only policy class that directly addresses the design half of the dual liability.
Key considerations for the PI policy include:
- The retroactive date: PI policies are typically written on a claims-made basis, meaning the policy in force when the claim is made must cover the period when the design work was performed. The retroactive date must reach back to when design work began.
- Limit of indemnity: the PI limit should reflect the scale and complexity of the design work, not just the construction value.
- Design consultants: if the contractor engages sub-consultants (structural engineers, hydraulic consultants, façade engineers), the programme needs to address whether those consultants carry their own PI cover or whether the head contractor's policy extends to their work.
Workers compensation is a statutory obligation in every Australian state and territory. Any D&C contractor with employees must hold workers compensation cover that meets the requirements of the relevant state legislation. This is not discretionary.
Plant and equipment insurance covers owned or hired-in machinery against damage and breakdown. For D&C contractors who operate significant plant, this is a practical addition to the programme.
Management liability insurance covers risks such as employment practices claims, statutory liability, and directors and officers exposure. It is less directly tied to the D&C model but relevant for any construction business operating as a company. Each layer needs to be checked against the others to confirm there are no gaps or conflicting exclusions.
How Do You Arrange Design and Construct Insurance Step by Step?
Arranging a design and construct insurance programme is not a single transaction. It is a process that starts before you tender and continues after the project is complete. Working through it in the right order reduces the risk of gaps appearing at the worst possible time.
Review the contract insurance requirements before you price the job. Most D&C contracts specify minimum policy types and limits of indemnity. Read these clauses before you tender. If the contract requires a PI limit that exceeds your current policy, you need to know that before you commit to the price.
Map your design and construction exposures separately. List the design work your organisation will perform directly and the work you will sub-contract to consultants. Then list the construction activities and any plant involved. This helps your broker identify where the two exposures interact.
Decide whether the programme will be contractor-controlled or owner-controlled. On larger projects, the principal may offer an owner-controlled insurance programme (OCIP). Confirm exactly what it covers and excludes, particularly whether it addresses design liability. An OCIP that covers construction risk but excludes professional indemnity still leaves you exposed on the design side.
Engage a specialist broker and provide complete information. Give them the contract, your scope of works, details of any sub-consultants, the project value, and the programme timeline. Incomplete information at this stage leads to policies that do not respond when you need them to.
Compare policy terms across all layers, not just premiums. Ask your broker to walk you through the professional services exclusion in the public liability policy, the faulty design clause in the contract works policy, and the retroactive date on the PI policy. Confirm that limits meet the contract requirements.
Bind cover before work commences, including design work. If design work begins before the policy is in force, that period may fall outside the retroactive date. Cover must be in place from the moment design work starts, not from the date construction begins on site.
Keep records throughout the project. File all policy schedules, endorsements, and broker correspondence. If a latent defect claim arises years after practical completion, those records will matter.
Which Policy Exclusions Catch Design and Construct Contractors Off Guard?
The exclusions that cause the most problems for D&C contractors are not obscure. They appear in standard policy wordings and apply in predictable circumstances. Contractors often do not discover them until a claim is declined.
The professional services exclusion in public liability policies is the most common source of surprise. When a claim arises from a design error, even one that causes physical damage to a third party, the insurer may apply this exclusion to decline the claim. For a D&C contractor, this can remove cover for a significant category of claims that arise directly from the dual role. The exclusion's exact scope varies by policy and must be reviewed carefully.
The faulty design exclusion in contract works policies works differently but creates a related problem. Contract works cover generally excludes the cost of rectifying defective design from the insured works. The policy may still respond to physical damage that results from the design error, but the underlying design defect itself is not covered for rectification. This means a D&C contractor may face the cost of redesigning and rebuilding a defective element without contract works cover responding to the full loss.
Consequential loss and delay is another area where gaps appear. If a design error causes a delay, the contractor may face liquidated damages or loss of revenue claims from the principal. Standard PI policies do not automatically cover consequential financial loss of this kind, and contract works policies typically exclude delay in start-up unless that cover is specifically added. Confirm whether consequential loss is covered before signing a contract.
Fitness for purpose warranties create a specific PI exposure. Some D&C contracts require the contractor to warrant that the completed building will be fit for its intended purpose, a higher standard than the usual duty of reasonable care and skill. Most PI policies respond to claims based on negligence, not strict fitness for purpose warranties. Confirm the position with your broker before accepting that obligation.
Mismatched retroactive dates are a quieter risk. If a D&C contractor renews their PI policy with a new insurer and the retroactive date does not reach back to when design work on a current project began, a claim from that earlier work may fall outside cover entirely.
Design and Construct Insurance Checklist: What to Confirm Before You Sign
Before you execute a D&C contract, work through the following checklist against your current insurance programme.
Policy coverage and limits
- PI policy limit meets or exceeds the contract's specified minimum
- Contract works limit reflects the full project value, including variations and provisional sums
- Public liability limit meets the principal's requirements as stated in the contract
- Workers compensation cover is current and meets state legislative requirements
Policy terms and exclusions
- Professional services exclusion in the public liability policy has been reviewed and its scope understood
- Faulty design clause in the contract works policy has been reviewed
- PI policy retroactive date reaches back to the commencement of design work on this project
- Consequential loss and fitness for purpose obligations in the contract have been discussed with your broker
- Policy period extends to practical completion and, for PI, beyond it
Design consultants
- All sub-consultants engaged for design work hold their own current PI cover
- Sub-consultant PI limits are appropriate for the scope of their design work
- You have confirmed whether your PI policy extends to sub-consultant work or whether each consultant must carry their own
Documentation
- Certificates of currency are ready to provide to the principal on request
- Policy schedules and endorsements are filed and accessible
- Broker contact details are recorded for the duration of the project
When Should a D&C Contractor Use a Specialist Insurance Broker?
A D&C contractor carries two distinct liability exposures that must be covered by coordinated policies. A specialist construction insurance broker understands how the professional services exclusion, the faulty design clause, and the PI retroactive date interact across a programme, and has access to insurers active in the D&C space. Arranging that coordination through a non-specialist broker increases the risk of gaps appearing between policy layers. For guidance on what that specialist role involves, see Construction Insurance Broker: Why Specialist Advice Matters.
ABS Insurance Brokers is an Australian-owned insurance brokerage that sources and arranges specialist insurance policies for builders, construction businesses, and general commercial clients. The firm operates as part of the Steadfast Network, giving it access to a wide range of insurers and products. You can contact the team by phone or through an online quote request form.
FAQs
Does a subcontractor working under a D&C head contractor need their own professional indemnity insurance?
Generally, yes. A subcontractor who performs design work as part of a D&C project carries their own design liability, separate from the head contractor's. The head contractor's PI policy may not extend to work performed by sub-consultants or design subcontractors. Each party performing design services should hold their own PI cover with limits appropriate to the scope of their work. Confirm the position with your broker before engaging sub-consultants on a project.
How long should a design and construct contractor maintain professional indemnity cover after a project is complete?
PI policies are written on a claims-made basis, meaning the policy in force when a claim is made must cover the period when the design work was performed. Because design defects can be latent and may not surface until years after practical completion, D&C contractors should maintain PI cover for a significant period post-completion. The appropriate run-off period depends on the nature of the project and any contractual obligations. Your broker can advise on the minimum period that reflects your actual exposure.
What is the difference between a project-specific policy and an annual construction insurance policy?
A project-specific policy is arranged for a single project, with limits and terms set to that project's scope, value, and timeline. Cover ends when the project completes. An annual policy runs for a 12-month period and can cover multiple projects within that period, subject to the policy's conditions and any declared project values. For D&C contractors with a consistent pipeline of work, an annual programme may be more practical. For a single large or complex project, a project-specific policy allows the terms to be tailored precisely to that contract's requirements.
Can a principal take out an owner-controlled insurance programme that covers the D&C contractor’s design liability?
A principal can arrange an owner-controlled insurance programme (OCIP) that covers construction risk across a project, but design liability cover is not automatically included. Many OCIPs are structured around contract works and public liability, leaving professional indemnity to the individual contractors. If a principal intends the OCIP to cover the D&C contractor's design liability, that must be explicitly confirmed in the policy terms. As a D&C contractor, you should not assume an OCIP addresses your PI exposure without reviewing the policy and discussing the scope with your broker.
Is fitness for purpose cover available under a professional indemnity policy for D&C contractors?
Market availability varies. Most PI policies respond to claims based on a standard of reasonable care and skill, which is a lower threshold than a contractual warranty that the completed building will be fit for its intended purpose. Whether a policy will respond to a fitness for purpose claim depends on the specific policy wording and the insurer. This is an area where you should not assume cover exists. Before accepting a fitness for purpose obligation in a D&C contract, discuss the implications with your broker and confirm the position with your insurer.
What happens if a design error is discovered years after practical completion?
Because PI policies operate on a claims-made basis, the policy in force at the time the claim is made must cover the period when the design work was performed. If a D&C contractor has allowed their PI cover to lapse after project completion, a claim arising from earlier design work may have no policy to respond to. This is why run-off cover, which extends the claims-made period after the policy is no longer renewed, is an important consideration. Contractors should also check that the retroactive date on any current policy reaches back to the relevant design period.
Conclusion
Design and construct insurance is not a single policy. It is a coordinated programme that must address two distinct liability exposures simultaneously: the physical construction risk and the professional design risk. Neither a standard builder's policy nor a standalone PI policy covers both on its own, and the exclusions in each policy class are specifically written to exclude the other's territory. Getting the programme right means reviewing all layers together, before you sign the contract.
The practical starting point is your contract. Read the insurance clauses before you tender, map your design and construction exposures separately, and confirm that your PI retroactive date reaches back to when design work begins, not when construction starts on site. If your current programme leaves the gap between policy classes unresolved, that is the question to put to a specialist broker before your next project commences.
