How to Choose the Right Builder in Perth

Picking a builder in Perth usually comes down to a mix of recommendations, a few Google reviews, and gut feel after a phone call. None of that is useless, but none of it tells you whether the business is legally entitled to build your house, or whether the number on their quote means what you think it means. Here's what actually protects you.

Check the licence is current — don't just take their word for it

Every builder operating in WA above the relevant work value threshold needs to hold a current registration with Building and Energy, the division of the Department of Local Government, Industry Regulation and Safety that regulates builders, building surveyors and building engineers in this state. Checking a licence takes about thirty seconds on the WA Online Licence Search, and it's worth doing for anyone quoting you, not just the builder you're leaning toward. Search by name and registration number rather than trading name — registered practitioners and contractors can share similar names, so match the number on the quote to the number in the register before you assume it checks out.

Questions to ask about contract type, payment schedule and variations — before you sign

Get clear, written answers to these before a deposit changes hands:

• Is this a fixed-price or transparent, itemized-pricing contract, and what exactly does that mean for how variations get priced?
• What's the payment schedule, and does it align with work actually completed rather than work about to start?
• What's excluded from the headline price — site costs, service connections, driveways, landscaping?
• How are variations documented, priced and approved once work is underway?
• Can I see a copy of your home indemnity insurance certificate before I pay a deposit?

On contracts between $7,500 and $500,000, WA's Home Building Contracts Act 1991 caps the maximum deposit a builder can request at 6.5% of the contract price, and progress payments are only meant to cover work or materials already delivered — not work about to start. If a builder is asking for more upfront than that, or wants a progress payment for something that hasn't happened yet, that's worth querying immediately, not after you've paid it. The difference between the two contract types matters more than it sounds — see our guide on cost-plus vs fixed-price contracts if you're still deciding which one suits your project.

Red flags in fixed-price quotes

A fixed-price quote that's noticeably lower than everyone else's usually isn't cheaper — it's just missing more. Watch for quotes that are vague about inclusions, silent on site costs (the same exclusions we cover in our Perth build cost guide), light on detail for the sequence of trades, or that lean on allowances for fixtures and finishes without specifying a realistic dollar figure against them. A builder who won't itemise what's included, or who gets defensive when you ask what happens if something unexpected turns up mid-build, is telling you something about how variations will be handled later.

What a disclosed, itemized invoice trail actually looks like

On a transparently priced job, you should be able to see the actual supplier and trade invoices as they come in, plus a management fee that was agreed and disclosed before the contract was signed — not folded invisibly into a single number. That's the real test of transparency: not whether a builder says they're upfront, but whether you can trace every dollar back to an invoice. If a builder can't or won't show you that trail on request, ask why.

None of this replaces trusting your own read of the person across the table. But a current licence, a clear answer on contract type, and a willingness to show you where the money goes are the three things worth confirming before you sign anything — regardless of which builder you end up going with.