Design and Construct Insurance for Australian Builders
Design and construct insurance (D&C insurance) protects builders who carry design responsibility as well as build responsibility. The moment you sign a design and construct contract — or novate the architect and engineers to your side of the table — you take on professional liability that a standard builder’s insurance program was never built to cover. D&C professional indemnity closes that gap.
Silverback structures design and construct professional indemnity (D&C PI) alongside contract works and public liability for design-build contractors across Australia. Our director’s background in contract administration with one of Melbourne’s leading builders means we read your contract’s design obligations the way a lawyer and an underwriter would — before you price the job.
Why Standard Cover Leaves a Gap on D&C Contracts
A standard contract works and public liability program responds to physical loss and third-party damage — not to a design error that costs your principal money without breaking anything. And many standard professional indemnity wordings exclude claims arising from construction or installation work, which is precisely what a design-build contractor does all day. The result: a builder who signs a D&C contract with a standard program can be uninsured for the exact risk the contract transfers to them. Design and construct insurance exists to close that gap deliberately.
What a D&C Insurance Program Covers
- Design liability — errors and omissions in design work performed in-house or by consultants novated to you
- Novated consultant risk — when the principal’s architect and engineers become your subcontractors, their design history becomes your exposure
- Fitness-for-purpose obligations — contract terms that go beyond reasonable skill and care, negotiated with underwriters rather than silently excluded
- Rectification and consequential costs — the financial loss flowing from a design failure, subject to policy terms
- Legal defence costs — investigating and defending design allegations, which in construction disputes routinely arrive bundled with workmanship claims
- Run-off cover — design claims surface years after practical completion; your PI needs to survive the defects liability period and beyond
D&C Risk Issues We Solve
Contract review before you sign. We review the insurance and design-liability clauses of your D&C contract — indemnities, fitness-for-purpose warranties, PI requirements, principal’s policy interfaces — and tell you what is insurable, what is negotiable and what you would be carrying uninsured.
The annual-versus-project decision. Contractors with steady design-build turnover usually run annual D&C PI; a one-off major project sometimes justifies project-specific PI with a long run-off tail. We model both against your pipeline.
Retroactive dates and continuity. Switching insurers without protecting your retroactive date can void cover for every design decision you have already made. We manage continuity so past projects stay covered.
Matching limits to contract requirements. Principals increasingly specify PI limits and durations in the contract. We benchmark what is actually required against what the market charges, and push back on requirements that are uninsurable as drafted.
NSW builders: professional indemnity is becoming mandatory for registered building practitioners under the DBP Act. Read our guide to the NSW builder PI requirements and deadline.
Common D&C Claim Scenarios
The claims that reach design-build contractors rarely announce themselves as “design” claims. A slab designed for the wrong load rating discovered at fit-out. A facade detail that passes documentation review but fails in weather, arriving first as a water-damage complaint. A services clash between novated engineering packages that surfaces as a delay and variation dispute. Mechanical plant that meets specification but not the tenant’s use, raising fitness-for-purpose warranties. In each case the argument is about who owned the design decision — and the builder who signed the D&C contract owns it unless their program says otherwise. This is why D&C claims are fought across two policies at once: the PI insurer arguing it is workmanship, the liability insurer arguing it is design. A program placed as one risk, with wordings that meet, avoids being the battleground.
What Underwriters Assess on D&C PI
Expect underwriters to weigh: the split of your turnover between design-and-construct and construct-only work; who performs design (in-house, novated consultants, subcontracted engineers) and their own PI arrangements; your project types and values, and any high-risk elements — facades, waterproofing, structural transfer, fire engineering; contract forms you sign and the warranties in them; your claims and circumstance-notification history; and your documentation discipline, from design review gates to RFI records. Turnover-based rating means the premium follows your design-build revenue — another reason the annual-versus-project structure decision is worth modelling properly rather than defaulting.
Typical Design and Construct Projects We Broker
Residential design-build and knock-down-rebuild programs, commercial and industrial D&C — warehouses, cold stores, office fit-outs — mixed-use developments where the builder engages the design team, design-and-construct facade and structural packages, and specialist trade contractors who design what they install: steel fabricators, facade contractors, fire protection, mechanical and hydraulic services.
Who Needs Design and Construct Insurance
Builders signing D&C or ECI contracts. Contractors accepting novated design consultants. Trade contractors whose scope includes design — shop drawings that go beyond documentation into engineering judgement. Developers running in-house design teams. If your contract says “design” anywhere in your scope, you carry design liability, whether or not you drew anything yourself.
Why Silverback for D&C Insurance
Most brokers read a D&C contract for the insurance clause. We read the whole risk allocation — because our director has sat on the builder’s side of PCG meetings, variations and defects liability negotiations. That is the difference between a PI policy that satisfies the contract on paper and a program that actually responds when a design dispute lands. We also make sure your D&C PI, contract works and professional indemnity lines meet in the middle instead of leaving gaps between them.
Price the Design Risk Before You Sign
Send us the contract before you commit. Request D&C advice or call 0410 152 835 — Monday to Friday, 8:00am–5:00pm.
Related Cover
General advice only. This information does not take into account your objectives, financial situation or needs. Consider the relevant Product Disclosure Statement before deciding to acquire any insurance product. Silverback Insurance Pty Ltd (CAR 1283436 | ABN 74 643 561 746) is a Corporate Authorised Representative of Australian Broker Network Pty Ltd (AFSL 253131 | ABN 89 062 882 080).
Further reading: Professional indemnity for NSW builders: what the DBP Act requires