Building and trade rules in Western Australia
The regulator is Building and Energy (WA Government).
Deposit limit
The maximum deposit is 6.5% of the contract price, for fixed price home building contracts between $7,500 and $500,000.
Source: Building and Energy, checked 11 November 2026.
Contracts and licences
Home building contracts must be in writing and signed by both parties. Since 1 July 2026, Class 10a buildings valued under $50,000 do not need a registered building contractor, though building permit rules still apply.
Source: Building and Energy
Go to Building and Energy (WA Government) >
General information, not legal advice. Rules change, so check the regulator before you sign. See trade costs >