Insurance for Builders.

Most builders carry public liability insurance as the foundation, with professional indemnity added where the work involves any design, documentation or certification and a business pack for tools, site office and portable equipment. The right mix depends on whether the builder takes on design responsibility as part of the job, or builds purely to someone else's finished documentation.

There is no single national rule, and requirements vary by state. In NSW, registered building practitioners providing building compliance declarations are required to hold professional indemnity insurance under the Design and Building Practitioners Act, though an exemption on this requirement was extended in 2026 by 12 months to 30 June 2027. Other states apply their own registration and insurance conditions, which are worth checking directly with the relevant regulator.

This is still worth considering. If a builder is the one responsible for delivering the design element of a project, even where the actual drafting is subcontracted out, a design error can still come back to the builder. Professional indemnity policies vary in whether they extend to subcontracted work, which is worth confirming directly.

Public liability responds to third party injury or property damage caused by the physical work itself, such as a site incident. Professional indemnity responds to a financial loss claim arising from the design, documentation or certification a builder provided, such as a defect traced back to a drawing rather than the build itself. A builder who takes on any design responsibility often carries an exposure to both.

This depends on whether the builder's role is purely to construct to a fixed specification, or also involves design input, variation advice or certification along the way. A builder with no design involvement typically relies on public liability, while a builder who signs off on documentation or provides design advice carries a separate professional indemnity exposure.

These cover different things. Home warranty insurance, also called builders warranty or home building compensation cover in some states, is a consumer protection scheme that can respond if a licensed builder cannot complete work or rectify defects due to death, disappearance or insolvency. Professional indemnity responds to a financial loss claim arising from the builder's own design, advice or certification. Many builders need to consider both rather than one instead of the other.

Premiums vary depending on the scope of design work involved, project value, claims history and the limit selected. Builders undertaking pure construction with no design input typically pay less than those carrying design responsibility on top of the build. An accurate premium requires an underwriter assessment of the specific business.

"Design and construct" is mainly an insurance industry term, not a label most builders use for their own contracts day to day. It describes any situation where a builder takes on part of the design responsibility for a project, whether through a delegated design portion, a novated consultant or specifications the builder writes and signs off on, rather than building solely to a separate architect or engineer's completed documentation. Insurers group this pattern together because it shifts design liability onto the builder, which is why professional indemnity typically becomes relevant alongside public liability.

Most builders carry both, since they cover different exposures. Public liability responds to physical injury or property damage on or around a site, while professional indemnity responds to a financial loss claim over design, documentation or certification. A builder taking on any design responsibility typically needs both in place together.

Insurers typically ask for the builder's licence details, annual turnover, the types of contracts used including whether any design responsibility is involved, claims history and the cover limit required. A broker can help present this information accurately to the market.

A previous decline does not rule out cover elsewhere. Professional indemnity for builders carrying design responsibility is a specialist area, and a broker with access to the right panel can often place risks that a single insurer has turned down.