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The best way to work out how to choose a builder for a custom home is to treat it as a sequence rather than a single decision. You define the home and the budget, decide how it will be designed, shortlist builders who have built something similar, verify their registration, test them in person, check their past work, compare quotes on identical scope, and only then sign. Each stage removes builders on evidence, so the one left standing has earned the job.
This guide walks through that sequence for Melbourne homeowners, with the Victorian checks that apply at each point.
Victorian requirements in this article were reviewed on 14 October 2026. Rules change, so confirm what applies on the day you sign.
Before you contact a single builder, put the home and the money in writing, because a builder can only price what you can describe.
A useful brief explains how you live as much as what you want built: the rooms and their rough sizes, which spaces connect, storage, accessibility, and the finish standard you expect for joinery, stone, glazing and fixtures. Finish with the handful of details you will not trade away, because those are what you will test builders against.
The budget should be the cost of the whole project. Design and engineering fees, surveys, permits, demolition on a rebuild, service connections, landscaping, driveways and a contingency all sit outside a typical construction price, so a construction-only figure always understates the real cost.
If you can, commission the feature and level survey and soil report now, because quotes prepared with that information carry far fewer guesses. A pre-construction planning checklist helps confirm the groundwork is complete before builders see the project.
Settle how the home will be designed before you shortlist, because the delivery model decides which builders are even in contention.
Most custom homes follow one of two routes. In an architect-led project, an architect or building designer completes the drawings and specification first, and builders then tender on that finished documentation. In a design and construct arrangement, one business takes the home from first sketch to handover, so construction cost and buildability shape the design as it develops.
Architect-led tendering gives you independent design advice and quotes you can compare line by line, but cost feedback arrives late. Design and construct brings pricing input in early and closes the gap between designer and builder, but you choose on capability rather than matching quotes.
How custom the home is matters as well. Standard custom, full custom and pre-designed homes differ in documentation, timeframes and cost, and few builders do all three well. A business organised around a catalogue of plans rarely has the systems for a one-off architectural home with a complex structure and bespoke finishes.
Gather eight to ten names from sources you can check, then keep only the three or four builders whose finished homes look like the one you want.
The strongest leads come from people who have seen builders work: architects and designers, friends or neighbours who built recently, and signboards on homes like yours in your area. Treat online reviews as a way to spot repeated patterns, and give detailed accounts more weight than star ratings.
Then filter hard on fit. Does the builder regularly deliver homes at your size, budget and complexity, on sites like yours, in your part of Melbourne? A strong record on single-storey homes on flat land says little about three levels and a basement on a steep block.
Stop at three or four. Beyond that, you cannot give each quote and reference proper attention, and capable builders are less willing to price a job they see as a long-odds tender.
In Victoria, search every shortlisted builder on the Building and Plumbing Commission (BPC) registers before you spend time in meetings.
The BPC's find and check a practitioner search shows whether a builder is registered, which class of work the registration covers, whether it is current and whether conditions apply. Make sure the class covers building a new home. Then search the compliance and enforcement register for disciplinary action.
Compare the registered name with the business that will sign your contract. Registration often sits with a director while a company holds the contract, which is fine when it is explained and documented.
Registration also underpins your insurance. The BPC states that Home Warranty does not protect homeowners who use an unregistered builder for work that legally requires a registered one.
ROMAAC Group, for example, lists its registrations, DB-U 100420 and CD-BU 100477, on every page of its website.
Use the first meeting to learn how the builder runs a job, which comes down to people, capacity and process rather than presentation.
Ask who will supervise your site each day and who you will call when something goes wrong. Ask how many homes the business is building at once and how supervisors are spread across them. Ask how progress is reported, how decisions are recorded and how a variation is priced and approved before work proceeds. The answers you want are concrete: a named supervisor, a set reporting routine and a written variation procedure.
Watch how each builder responds to your brief. One who asks about the soil report and slope is already managing risk; one who quotes a square-metre rate within minutes is pricing a generic house.
Bring a written list: the questions to ask a builder before you sign cover registration, payments, programme and handover in detail.
Finished homes and former clients show how a builder performs once the contract is signed, which no brochure can.
Ask each builder for two or three references from homes similar to yours, ideally completed more than a year ago, so you hear how defects were handled after the keys changed hands. Ask whether the home finished on the contracted date, how variations were priced, how problems were raised and fixed, and whether they would hire the builder again.
If an owner lets you walk through, look at the details wide-angle photography hides: joinery alignment, tile lines, window reveals and stone junctions. Then ask to see a live site, because how it is kept tells you how your own build will be run.
Bring the same scrutiny to a builder's portfolio. When you look at a project such as ROMAAC's Camberwell custom home, ask what the builder was responsible for, how long it took and which parts were hardest to build.
Have every shortlisted builder price the same drawings, specification and inclusions, then compare what each quote covers before you compare totals.
Send each builder an identical documentation set and ask for an itemised price with written inclusions and exclusions. Then focus on the items most likely to move the final cost.
Consumer Affairs Victoria recommends avoiding provisional sums and prime cost items where possible because both can push the final cost up, and it requires the contract to break down the estimate behind each one.
A quote well below the others usually means something is missing or under-allowed, and several common builder red flags in Melbourne first show up at this stage. If you negotiate, negotiate on scope, allowances and payment terms rather than squeezing the headline price.
Do not sign or pay anything until an independent lawyer has reviewed the contract and you have confirmed the deposit and insurance meet Victorian requirements.
Consumer Affairs Victoria states that a deposit cannot exceed 5% of the contract price for contracts of $20,000 or more, or 10% below that. On a $1.5 million contract, the most a builder can ask for up front is $75,000. After the deposit, you pay as each stage (base, frame, lock-up and fixing) is completed, never ahead of the work.
For eligible work under contracts signed on or after 1 July 2026, Home Warranty has replaced Domestic Building Insurance where the work is valued at more than $20,000. The BPC provides Home Warranty, and the builder must pay the premium before the earlier of 10 business days after signing or the start of work. Ask when your Notice of Cover will arrive, and hold back the deposit until you have proof of cover.
Take the full contract, drawings and specification away for review by a building lawyer; a builder who presses you to sign on the day has told you how the job will run. Victoria's domestic building contract laws are also being updated under the Domestic Building Contracts Amendment Act 2025, and the changes apply only to contracts signed after they commence, so check which rules cover your contract on the day you sign.
Choosing a builder well is a chain of checks, each one narrowing the field on evidence rather than impressions. ROMAAC Group delivers custom home construction across Melbourne, and a pre-construction consultation is the place to test your brief, budget and site before anything is signed. Make an enquiry when you are ready.
A good builder holds current registration on the BPC register with no unexplained conditions, can show finished homes similar to yours, and has past clients who will speak openly about timing, variations and defects. They price your documents line by line, name the people who will run your build, and give you time to have the contract independently reviewed.
Three or four detailed quotes is enough for most custom homes. Every builder should price the same drawings, specification and inclusions so the totals mean the same thing. With fewer than three, it is hard to tell whether a price is reasonable. With more than four, each quote and reference check gets less attention than it deserves.
Use the Building and Plumbing Commission's find and check a practitioner search to confirm the builder's registration is current, see the class of work it covers and spot any conditions. Then search the BPC compliance and enforcement register for disciplinary action, and check that the registered name matches the business named on your contract.
According to Consumer Affairs Victoria, the deposit for domestic building work cannot exceed 5% of the contract price for contracts of $20,000 or more, or 10% for contracts below $20,000. A custom home will almost always fall under the 5% limit. Do not pay any deposit until the builder has provided proof of the required insurance cover.
Not on price alone. A quote well below the others often leaves out scope, carries low provisional sums or prime cost allowances, or excludes site works that return later as extra costs. Compare what each quote includes, the assumptions behind its allowances and the builder's track record, then choose the strongest value for a clearly defined scope.
Both suit custom homes. Hiring an architect first gives you independent design advice and quotes you can compare on identical drawings. A design and construct builder handles design and construction together, which brings cost and buildability input in from the start. The better option depends on how much design control and price comparison you want.
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