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Homeowner Guide · 2026

10 Questions to Ask Before
Hiring a Builder in Australia

Before you sign a contract or hand over a deposit — get these answers in writing.

📅 Updated June 2026 ⏱ 9 min read 🏗️ Builders & Renovations

Knowing the right questions to ask a builder Australia homeowners can trust is the single most protective thing you can do before committing to a build or renovation. In Australia's current construction climate — where builder insolvencies hit record highs in 2025 — choosing the right builder is no longer just about price. It is about survival.

This guide gives you the exact questions to ask, the red flags to watch for, and a free builder checklist Australia homeowners can print and take to every consultation. Use it every single time.

3,490
AU construction firms entered external administration in 2025
900%
Spike in "new construction home builders" searches in late 2025
6 yr
Minimum structural warranty required by law in most AU states
📋 In This Guide
  1. Are You Licensed and Insured in This State?
  2. Have You Completed Projects Like Mine Before?
  3. Can I See References from Your Last Three Jobs?
  4. Who Will Be On-Site Managing My Project?
  5. What Does Your Contract Cover — and What Doesn't It?
  6. How Do You Handle Cost Variations?
  7. What Is Your Current Workload?
  8. What Is Your Defects Liability and Warranty Period?
  9. Who Organises Council Approvals and Permits?
  10. How Will You Communicate With Me During the Build?
  11. 5 Frequently Asked Questions
1
Are You Licensed and Insured in This State?

This is question zero. Every other question comes after this one is answered — in writing. In Australia, builder licensing is managed at the state and territory level. A licence valid in Queensland is not automatically valid in New South Wales. Before anything else, verify.

Ask them for their contractor licence number then check it yourself. In NSW, use the NSW Fair Trading licence check. In Victoria, use the Victorian Building Authority search. In Queensland, check the QBCC licence register.

⚡ Why It Matters An unlicensed builder cannot take out Home Warranty Insurance on your behalf. If the project fails or the company collapses, you have zero legal protection and no recourse under the building contract.
Pro Tip For residential work above $20,000 in most states, the builder is legally required to hold Home Warranty Insurance. Ask for the certificate — not just their word.
2
Have You Completed Projects Like Mine Before?

When you are figuring out how to choose a builder Australia research consistently shows that project-type experience matters more than years in business. A builder with 20 years in commercial construction is not the right person for a sloping-block knockdown rebuild in a heritage suburb.

Ask directly: "Have you built on a sloping block before?" or "Have you worked with heritage overlay requirements in this council area?" Vague answers like "yes, we've done all sorts" are a red flag.

⚡ Why It Matters Specific project experience means the builder already knows the subcontractors, the council quirks, and the material sequencing for your type of build. Learning on your job costs you time and money.
3
Can I See References from Your Last Three Jobs?

Not from their best jobs. Not from five years ago. Their last three. This is non-negotiable. A builder who hesitates here is hiding something — a delayed project, a dispute, a client who would not recommend them.

Call the references. Do not just read a testimonial on their website. Ask the previous client: Did it finish on time? Did it come in close to budget? Were variations handled fairly? Would you hire them again? According to CHOICE, verified reviews and direct reference checks are the most reliable filter available to Australian homeowners.

Pro Tip If possible, visit a completed job or an active site. See how they treat a site that is in progress — organisation, safety, cleanliness. That is your future build site.
4
Who Will Be On-Site Managing My Project Day-to-Day?

The person who quotes your job and the person who runs your job are often two different people. You need to know who is actually responsible for your site once work starts.

In NSW, any supervisor must hold a current Supervisor Certificate issued by Building Commission NSW. Ask for their name, their certificate number, and check it independently. If the answer is "we rotate supervisors depending on workload" — that is a risk.

⚡ Why It Matters Poor supervision causes subcontractor errors to go unchecked. Every defect that is built in costs 10× more to fix after completion than it does to catch during construction.
📋

Download the Free Builder Checklist Australia

All 10 questions formatted as a printable one-page checklist. Take it to every builder consultation.

Get the Free Checklist →
5
What Does Your Contract Cover — and What Doesn't It?

Most disputes between homeowners and builders come down to one thing: both parties had a different understanding of what was included. A clear, detailed contract is your only protection.

Master Builders Australia and the Housing Industry Association (HIA) both publish standard residential building contracts that are widely recognised and legally sound. If your builder uses a custom contract, have a solicitor review it before signing.

Pro Tip Ask them to walk you through every PC (Prime Cost) item and provisional sum in the quote. These are estimates, not fixed prices — and they are often where final costs blow out significantly.
6
How Do You Handle Cost Variations?

Variations — changes to the original scope after work has started — are the most common source of budget blowouts on Australian residential builds. Every builder will tell you variations are "handled professionally." What you need is a process in writing.

Ask specifically: Do variations require written sign-off before work proceeds? What is your markup on variation labour and materials? Can I see a sample variation form?

⚡ Why It Matters Budget an additional 10–15% on top of your fixed contract price for variations on a standard new build — more on a renovation. A builder who cannot show a documented variation process will add costs without warning.
7
What Is Your Current Workload?

An overcommitted builder is a slow builder — and in a rising cost environment, a slow builder is an expensive builder. Labour and materials cost more every month a project is delayed.

This is one of the most important questions to ask a builder Australia homeowners overlook because they are relieved to find a builder at all. Do not let availability desperation cloud this question. Ask directly: How many active projects are you currently managing? What is your earliest start date? What is your realistic completion timeline?

Pro Tip Ask for the completion timeline in writing, with staged milestones attached to your progress payment schedule. When payments are tied to milestones, builders stay motivated to hit them.
8
What Is Your Defects Liability and Warranty Period?

In most Australian states, builders are legally required to provide a minimum structural defects warranty of six years and a non-structural defects warranty of two years. This is the legal floor — not a reason to feel comfortable. Ask what the builder offers beyond the statutory minimum.

For clarity on what warranties apply in your state, the ACCC consumer rights guide on warranties outlines your protections under Australian Consumer Law. Your ACL rights cannot be contracted away.

⚡ Why It Matters Structural defects — cracking, movement, waterproofing failures — often do not appear until two to five years post-completion. A clear warranty process tells you how the builder behaves when things go wrong.
9
Who Organises Council Approvals and Permits?

Development Applications (DA), Construction Certificates (CC), and Building Permits are part of every build in Australia. Who is responsible for obtaining them, what they cost, and how long they take must be clear before you sign.

Some builders include DA management in their contract. Others quote purely for construction and expect you to handle all approvals through a private certifier. Ambiguity here can add $10,000–$30,000 and 3–6 months to a project.

Pro Tip Ask for a written schedule of who is responsible for every approval, who pays the fees, and the estimated council processing time for your specific council area. Approvals in inner-city Sydney councils routinely take far longer than regional areas.
10
How Will You Communicate With Me During the Build?

This question reveals a builder's professionalism more clearly than almost any other. Communication is not a soft skill in construction — it is a risk management tool. A builder who does not communicate clearly during the quoting stage will not communicate clearly once your money is on the line.

Ask: Do you use project management software? How often will I receive a progress update? What is your process when something unexpected happens on site? Who is my single point of contact?

⚡ Why It Matters The most common homeowner complaint about builders in Australia is not cost overruns — it is disappearing. Builders who go quiet during a build are builders whose projects stall, quality slips, and disputes escalate.

Frequently Asked Questions

Each state has its own licensing authority. In NSW — NSW Fair Trading licence checker. In VIC — Victorian Building Authority. In QLD — QBCC licence register.

Always search by licence number — not just name — to confirm the result matches the person standing in front of you. A licence number must also appear on all quotes and contracts the builder provides.

A fixed-price contract locks in a total price for the defined scope. Variations cost extra but the base price does not change. A cost-plus contract charges you actual cost of labour and materials plus a builder's fee — usually a percentage of total costs.

Fixed-price contracts offer more budget certainty. On any fixed-price contract, pay close attention to provisional sums and prime cost items — these are estimates within a fixed contract that can still vary significantly at final account.

Deposit limits are regulated by state law. In NSW, a builder cannot legally ask for more than 10% on contracts under $20,000, or more than 5% on contracts over $20,000. Victoria also caps deposits at 5% for contracts over $10,000. Queensland follows similar restrictions under the QBCC Act.

Never pay the full project cost upfront. Progress payments tied to milestones — slab, frame, lockup, fixing, completion — are the standard and safest payment structure.

Home Warranty Insurance (Domestic Building Insurance in VIC) protects homeowners if their builder dies, disappears, or becomes insolvent before completing the project, or fails to fix structural defects after completion. It is compulsory for residential work above a threshold in most states.

The builder takes out this insurance — but you should receive and keep a copy of the certificate before paying any deposit. It is your protection, not theirs.

BuilderApp lists licensed, reviewed Australian builders across residential construction, renovations, extensions, and trades. Search by postcode or suburb, filter by project type, and read verified reviews before making contact.

Every builder profile on BuilderApp displays their state licence number so you can independently verify it before requesting a quote. Use the free builder checklist Australia PDF to prepare before every consultation.

Ready to Find a Verified Builder?

Search BuilderApp's network of licensed, reviewed Australian builders — filter by location, trade, and project type.

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