The builder decision determines the outcome of a Melbourne renovation more than the design, the budget or the materials. A good builder will absorb the surprises this city’s housing stock produces — the rotted bearer, the stump that crumbles when the load comes off it — and hand back a project close to the number they quoted. A bad one turns a well-documented job into eighteen months of variations and a VCAT application.
Victoria has a well-defined regulatory framework for residential building, and using it properly eliminates most of the risk. This guide covers the checks that matter, how to compare quotes fairly, and the warning signs that predict trouble.
Verify VBA Registration First
In Victoria, a builder carrying out domestic building work above the statutory threshold must be registered with the Victorian Building Authority. This is the first check and it takes two minutes on the VBA’s public register.
What to check on the VBA register
Confirm:
- The registration is current, not expired, suspended or cancelled
- The class of registration covers the work — a domestic builder (unlimited) registration for structural work, with specialist trades holding their own licences
- The name on the registration matches the entity that will sign your contract. This is where problems hide. A registered individual operating through an unregistered company, or a company whose registration depends on a nominated director who has since left, is a serious risk.
- Any disciplinary history, conditions or infringements recorded against the registration
The entity behind the registration
Also run a company search on the contracting entity. Check how long it has traded, who the directors are, and whether those directors have previously been involved in companies that were wound up. Phoenix activity in residential construction is a real phenomenon and the register makes it visible.
Domestic Building Insurance
For domestic building work above the statutory threshold, the builder must take out domestic building insurance before taking any money, including a deposit, and must give you the certificate.
This cover protects you where the builder dies, disappears or becomes insolvent, and is the safety net beneath the entire arrangement.
Two practical points. First, a builder who cannot obtain this cover cannot legally take your money — and inability to obtain it is itself a strong signal about their financial position, because insurers assess builders before issuing it. Second, verify the certificate independently rather than accepting a PDF. It should name your property, the contract value and the scope of works.
Where to Find Candidates
The best sources of Melbourne builders, roughly in order of reliability:
- A recommendation from someone whose completed project you have walked through. Not a friend of a friend — someone who lived through it and will tell you honestly what went wrong.
- Your architect or draftsperson’s list. Designers work with builders repeatedly and know who prices honestly and who finishes.
- Master Builders Victoria and HIA member directories. Membership is not a quality guarantee but indicates a business operating formally with insurance and a reputation to protect.
- Local project signage. Builders working in your suburb on similar stock understand the specific issues — the stumps, the clay, the council.
- Trade referrals. A good plumber or electrician knows which builders pay on time and run organised sites, which correlates strongly with everything else.
Be cautious with lead-generation platforms, which connect you with builders who paid for the lead — selecting for marketing spend rather than construction quality.
Melbourne-Specific Experience Matters
This city’s housing stock demands particular knowledge, and a builder who has worked mostly on new homes in the growth corridors will struggle with a Brunswick cottage.
Ask specifically about:
- Restumping and reblocking. Have they done it, do they subcontract it, and how do they sequence it against the rest of the work?
- Reactive clay footings. How do they handle the junction between an existing stumped house and a new slab-on-ground addition? If the answer does not include an articulation joint or matched foundations, keep looking.
- Rot and framing repair. What is their rate for replacing bearers and joists, and what happens when they open a bathroom floor and find failure?
- Heritage overlays. Have they worked in your council area, and do they understand what the planning permit conditions will require?
- Energy compliance. How do they achieve the required rating on an old house, and what does it cost?
A builder who answers these confidently has worked on Melbourne’s real housing stock. One who has not considered them is telling you something.
A related guide to consider while planning this work is How Long Does a Renovation Take in Melbourne? A Realistic Timeline.
The Reference Check That Works
Ask for the last three, not the best three
Every builder supplies three references who will say good things. Ask instead for the contact details of the last three projects completed, and ask those owners:
- What was the contract sum, and what was the final invoice? The gap is the most informative number you will get.
- How many variations were there, and were they priced before the work or after?
- Did the project finish on the contracted date, and if not, why?
- How did the builder respond when something unexpected was found under the floor?
- Were the site kept clean and the neighbours managed?
- How was the defects period handled after handover?
- Would you use them again — and, the key follow-up, what would you do differently?
Visit a live site
Ask to visit a current site as well as a completed one. A live site shows how the builder actually works: whether it is organised, whether materials are protected from Melbourne weather, whether a supervisor is present, whether the trades are the same faces each week.
Getting Comparable Quotes
Most homeowners compare three quotes that are not comparable, choose the lowest, and pay the difference in variations. The fix is to control the documentation.
Tender on identical documents. Every builder prices the same drawings, specification, finishes schedule and inclusions list. Incomplete documentation means each builder assumes something different, and the cheapest quote is the one that assumed the least.
Require an itemised breakdown — trade-by-trade allocations, preliminaries, margin, and any provisional sums.
Interrogate provisional sums and prime cost items. A builder can win a tender by setting them low and adjusting upward once you are committed. Ask what each allowance is based on. A $6,000 allowance for tapware and fixtures across two bathrooms is not realistic.
Check the exclusions. Common ones that become expensive in Melbourne: restumping, rot and framing repair, asbestos removal, service upgrades, floor levelling, landscaping, driveways, painting, floor coverings, permit fees, and site amenities.
Be suspicious of the outlier. If three quotes land at $280,000, $295,000 and $198,000, the low quote has misread the scope or intends to recover the gap through variations. Ask them to walk you through their figure — a confident builder will do this readily.
Understanding the Margin
A builder’s quote has three components: direct trade and material costs; preliminaries covering site establishment, scaffolding, temporary fencing, waste removal, supervision and insurances; and margin, the gross profit before overheads.
- Preliminaries typically run 8 to 15 per cent of a Melbourne residential project
- Margin typically runs 12 to 20 per cent for mainstream work, 18 to 30 per cent at the premium end
A builder quoting materially below these ranges is underestimating, intending to recover through variations, or running so thin that a single problem project puts them under. Residential construction insolvency in Victoria is not rare, and the immediate cause is almost always work priced without adequate margin.
The productive negotiation is about scope and specification, not margin. Reducing the tile allowance or deferring landscaping saves real money. Pressing a builder to cut margin buys you a builder with no capacity to absorb a problem.
The Contract
Use a standard form
Victorian law requires a major domestic building contract in writing for work above the statutory threshold, with prescribed terms. Use a standard form — Master Builders Victoria or HIA residential contracts — rather than a builder’s own document.
Provisions to read carefully:
- The contract price and what it includes. Cross-reference against the quote and specification.
- The progress payment schedule. Payments tied to completed stages, not dates. Deposit amounts are regulated.
- The variation clause. Variations must be in writing, priced and signed before work proceeds. This single clause prevents most disputes.
- Completion date and extension of time provisions. Understand what entitles the builder to extra time — weather, variations, delays in your decisions — and how it must be claimed. Melbourne winters generate genuine weather claims.
- Liquidated damages for late completion, if any.
- The defects liability period.
- Dispute resolution and the process before escalation.
Statutory warranties apply regardless of what the contract says and cannot be contracted out of.
Warning Signs
- Pressure to decide quickly, particularly a discount that expires
- A request for a deposit above the regulated amount
- Reluctance to provide a VBA registration number or an insurance certificate
- A single-page quote for a six-figure project
- No written contract, or a suggestion that one is unnecessary
- Cash discounts, which remove your consumer protections along with the GST
- The person quoting is not the person building — ask who supervises daily and how many other projects they run
- Vagueness about subcontractors, particularly the waterproofer and the restumper
- Unwillingness to let you speak to past clients directly
- A pattern of blaming previous clients in conversation
Managing the Job
- Make decisions early and stick to them. Owner indecision is the largest single cause of delay and entitles the builder to extensions of time.
- Order long-lead items before construction. Joinery, windows, tiles, tapware and appliances all have lead times in weeks.
- Hold a weekly site meeting with a short written record of decisions.
- Approve variations in writing before the work happens. Never accept “we’ll sort it out at the end.”
- Photograph everything before it is covered — waterproofing, framing, stumps, service runs.
- Do not pay ahead of the schedule. Paying early to help a builder’s cash flow is how homeowners become unsecured creditors.
- Attend the mandatory inspections or at least obtain the building surveyor’s inspection records at each stage.
If Things Go Wrong
The escalation path
Raise the issue with the builder in writing, describing the defect and the resolution sought. If that fails, Domestic Building Dispute Resolution Victoria offers a free conciliation service for domestic building disputes and can issue binding dispute resolution orders.
Beyond that, VCAT hears domestic building disputes with jurisdiction to order rectification or payment. The Victorian Building Authority handles complaints about registered builders’ conduct and can take disciplinary action.
Where the builder becomes insolvent, the domestic building insurance policy is the claim path — which is why verifying that certificate at the outset matters more than any other single check.
What Good Looks Like
A good Melbourne renovation builder holds current VBA registration in the correct name, provides insurance certificates without being chased, quotes from complete documentation with an itemised breakdown, prices provisional sums realistically, uses a standard form contract, and issues written variations before doing work. They understand stumps and reactive clay. They have a supervisor who is on your job regularly, subcontractors who have worked with them for years, and past clients who describe the process as unremarkable.
A related guide to consider while planning this work is Renovating on Reactive Clay Soil: What to Discuss with Your Engineer.
That last quality is underrated. The best outcome is not a dramatic story — it is a project that finished roughly when it was meant to, cost roughly what it was meant to, and left you with a builder you would call again.
For cost benchmarks to test quotes against, see our Melbourne renovation cost guide, and for scheduling expectations, our guide to Melbourne renovation timelines.
Sole Traders, Small Builders and Volume Operators
Melbourne’s residential market has three distinct contractor types, each suited to different work.
- The trade-based sole operator — often a carpenter running small jobs with regular subcontractors. Excellent value on bathrooms, kitchens and small renovations. Limited capacity for structural work, permit coordination or projects requiring formal contract administration.
- The small to mid-sized builder — a business running three to eight projects with a supervisor on each. The right choice for extensions, whole-house renovations and anything requiring permit coordination. This is where most Melbourne renovation work sits, and where the quality distribution is widest.
- The volume or project builder — systematised and cost-effective on standard work, generally poorly suited to renovation where nothing is standard. Better suited to knockdown rebuilds.
Matching the type to the project matters more than finding “the best builder”. A superb bathroom specialist will struggle with a two-storey addition on a stumped cottage, and a builder geared for $700,000 projects will price a $50,000 bathroom uneconomically.
Questions Worth Asking at the First Meeting
- How many projects are you currently running, and who supervises mine day to day?
- How often will that person be on site?
- Are your key trades — carpenter, plumber, electrician, waterproofer, tiler, restumper — regulars or engaged per job?
- How do you handle a variation? Walk me through the process.
- What happens when you open the bathroom floor and the joists are rotted?
- How do you detail the junction between the new addition and the existing house?
- What is your current lead time to start?
- How do you programme around winter?
- Which parts of my project concern you most?
That last question is the most revealing. A builder who identifies genuine risks — the stumps, the clay, the roof junction, the unknown condition of the subfloor — has read the project. A builder who says it all looks straightforward has not.
The Site Visit That Tells You Most
Ask each shortlisted builder to walk the property with you before quoting, and watch what they do.
A builder who has worked properly in Melbourne will get into the subfloor, or at least look into it with a torch. They will check whether the floors are level, look at where the downpipes discharge, note the ground levels against the weatherboards, and ask when the house was last rewired. They will look at the roof from the street and ask about the overlay status.
A builder who walks through the internal rooms, takes some measurements and leaves has priced the visible work and made assumptions about everything else. On Melbourne’s housing stock, those assumptions become your variations.
This half-hour observation is worth more than any reference check, because it tells you directly whether the person quoting understands the building they are quoting on.