Some cover is legally required (like workers compensation if you employ workers, and warranty insurance at sale in several states), and construction works and public liability cover, while often not mandatory, is essential — building uninsured risks the whole project.
The short answer: yes — but “need” splits three ways
- Legally required in some cases. Workers compensation if you directly employ workers. Warranty / home indemnity insurance when you sell within a set window in states like Victoria and WA. Contractors you engage over certain thresholds must carry their own cover.
- Not mandatory, but essential. Construction (contract) works and public liability insurance during the build. The law may not force it, but an uninsured fire, storm or injury on your site can end the project and your finances. Treat it as non-negotiable.
- Worth checking regardless. Existing-structure cover on renovations, and personal accident cover for you and any unpaid helpers.
Do owner-builders need home warranty insurance?
This one confuses everyone. During the build, you generally can’t buy warranty cover for your own owner-builder work in most states — and in NSW that cover was abolished in 2015. Where it matters is at sale: several states require you to provide warranty / indemnity insurance to a buyer if you sell within the disclosure window. It’s a sale obligation, not a build one.
Get the specifics for your state
Which covers you must hold, which you should, and what applies when you sell all depend on your state and project. The owner-builder insurance guide lays out every policy with a state-by-state sale table.