Owner Builder vs Registered Builder in Victoria: An Honest Comparison

Written By Sultan Baloch

We are a registered builder, so you can reasonably expect us to be biased hereWe will try not to be.

Owner building works for some people. It genuinely does. But it works far less often than the people considering it expect, and the reasons it fails are usually not the ones people worry about in advance.

Here is what owner building in Victoria actually involves.

What an owner builder is

An owner builder is a person who takes on the role of the builder for work on their own land, rather than engaging a registered building practitioner to do it.

The important word is role. You are not simply managing a project. You are stepping into the legal position of the builder, with the duties and liabilities that come with it.

That is the part people underestimate.

The legal requirements in Victoria

A certificate of consent is required from the Building and Plumbing Commission, which took over from the Building and Plumbing Commission in July 2025, for owner builder work valued over $16,000. You cannot obtain a building permit as an owner builder without it.

An eLearning assessment must be completed before you can apply. It takes a couple of hours and covers your duties and obligations. There is a study guide.

Construction induction training is required for the project.

A frequency restriction applies. You generally cannot be issued a building permit as an owner builder if you have already had one in the previous five years for a different property, unless the work is a small second dwelling.

Selling within six years carries obligations. If you sell the property within six years of completion, you must obtain a defects inspection report complying with section 137B of the Building Act 1993. That report must be no older than six months, must include detailed photographs, and a copy must be given to the purchaser. You must also arrange domestic building insurance covering the work, by applying for a notice of cover and paying the premium.

These are not formalities. The six year rule in particular catches people out, because plans change and a house you intended to keep sometimes has to be sold.

What you actually take on

Beyond the paperwork, here is what the role involves day to day.

You are responsible for compliance. The house has to meet the Building Act 1993, the Building Regulations 2018 and the National Construction Code. That includes the 7 star minimum thermal rating and Whole of Home requirements that have applied in Victoria since 1 May 2024. If it does not comply, it is your problem.

You engage and coordinate every trade. Concreter, framer, roofer, plumber, electrician, plasterer, tiler, painter, and a dozen others. You find them, you check their registration and licensing, you contract with them, you sequence them, and you deal with it when one does not turn up.

You manage the sequence. The order of trades is not obvious and getting it wrong costs weeks. Trades who arrive to find the previous stage incomplete do not wait around.

You order and schedule materials. Lead times vary. Windows, trusses, cabinetry and imported items all need ordering well ahead. Running out of something mid stage stops the site.

You carry the site safety obligations. As the person controlling the workplace, occupational health and safety duties apply to you.

You arrange the mandatory inspections. The relevant building surveyor inspects at prescribed notification stages. You have to know when to call them and not proceed past a stage before they have.

You resolve the defects. When something is not right, you are the one negotiating with the trade who did it.

You carry the risk. If a trade damages a neighbour's property, if work has to be redone, if a delay costs you rent, that lands on you.

What you give up

This is the part that gets least attention and matters most.

Domestic building insurance. When a registered builder does work over $16,000, they must take out domestic building insurance. That policy covers you for structural defects for six years and non structural defects for two years from completion, and it responds if the builder dies, disappears or becomes insolvent.

As an owner builder, you have no such cover for your own work. You only arrange it if you sell within six years, and then it protects the purchaser, not you.

The implied warranties. Under the Domestic Building Contracts Act 1995, a builder gives statutory warranties about workmanship, materials, compliance and fitness for purpose. Those warranties run to you. As an owner builder, there is nobody above you giving them.

Recourse. If a registered builder's work is defective, you have a contract, warranties, insurance and a path through VCAT. If your own coordination produced the defect, you have your subcontractors, and only for their portion.

A single point of accountability. When something goes wrong at the junction between two trades, which is where most defects live, a builder owns that junction. An owner builder has two subcontractors each pointing at the other.

That last point is the most common practical failure. Individual trades usually do their own work adequately. Buildings fail at the interfaces, and managing interfaces is the actual skill of building.

When owner building genuinely makes sense

We would not be honest if we said never. It works when:

You work in the industry. If you are a licensed trade, a site supervisor, an engineer or a project manager with construction experience, you already have the knowledge and the network. This is the single biggest predictor.

The scope is modest. A shed, a carport, a deck, a garage, a straightforward renovation. Small scope, few trades, few interfaces.

You have genuine time. Owner building is not an evenings and weekends activity for a full build. Trades work business hours and they need decisions during business hours.

You have reliable trade relationships already. Not "I know a guy". Actual working relationships with people who will prioritise your job.

Your timeline is flexible. Owner built projects almost always take longer. If that is fine, it removes a lot of the pressure.

You are staying long term. The six year sale rule matters much less if you have no intention of selling.

When it usually does not

A full new home, if you do not work in construction. The number of trades, decisions, compliance points and interfaces is very large, and the learning curve is steep and expensive.

Anything structurally complex. Sloping sites, reactive clay requiring engineered footings, double storey with significant spans.

When you are financing it. Many lenders are cautious about owner builder projects and some will not lend at all, or will lend at lower ratios and release funds differently.

When you might sell. The section 137B obligations and the insurance requirement make an owner built home more complicated to sell within six years, and some buyers discount for it.

When you cannot afford the timeline to slip. If you are paying rent and a loan, delays compound.

The thing people get wrong about the money

The usual reason for owner building is to save the builder's margin.

Two honest observations.

First, a builder's margin buys something. It buys trade pricing built on volume and repeat work, it buys sequencing that keeps trades from waiting, it buys the insurance and warranties, and it buys somebody whose job it is to notice the thing that is about to go wrong.

Second, owner builders rarely achieve trade pricing. Subcontractors quote a one off residential job differently from an ongoing relationship with a builder who gives them work every month. The gap between those two numbers absorbs a meaningful part of the margin you were trying to save.

None of that means owner building never saves money. It means the saving is smaller and less certain than the arithmetic suggests, and it is paid for in time and risk.

The middle paths

It is not a binary choice.

Engage a registered builder and stay closely involved. You keep the warranties, the insurance and the single point of accountability, and you still make every decision about the house. This is what most of our clients do.

Owner build a defined portion. Landscaping, driveways, fencing, decking and painting are commonly owner completed after handover. Lower risk, real savings, no interference with the structural work or the warranties.

Use a registered builder for the shell and finish some elements yourself. This needs to be agreed and documented in the contract so responsibility is clear, but it is a normal arrangement.

Where we sit

We are a registered builder and we work with clients who want to be involved without carrying the builder's role. Our founder Sher Baloch comes from a structural engineering background, and we keep our volume low deliberately so that the same team stays on your project from the first meeting to handover.

If you are weighing up owner building, we are happy to give you a straight read on whether your specific project is one where it makes sense. Sometimes it is, and we will say so.

Read about our services and our approach, see our projects including Wheelers Hill and Cambridge, or get in touch.

You may also want to read our comparison of custom builders and volume builders, and our guide to what to look for in a custom home building contract.

Frequently asked questions

Do I need a certificate of consent for all owner builder work?

For domestic building work valued over $16,000, yes. Below that threshold it is not required, though the building permit requirements still apply to the work itself.

How often can I be an owner builder in Victoria?

Generally you cannot be issued a building permit as an owner builder if you have had one in the previous five years for a different property, unless the work is a small second dwelling.

Do I need domestic building insurance as an owner builder?

Not for your own occupation of the home. You do need to arrange it if you sell within six years of completion, along with a section 137B defects inspection report.

Can I do the plumbing and electrical work myself?

No. Plumbing and electrical work must be carried out by appropriately licensed or registered practitioners regardless of who is the builder. Owner building does not change licensing requirements for regulated trades.

Will the building surveyor treat me differently?

The compliance requirements are identical. Mandatory notification stages still apply and the surveyor still inspects in person. What differs is that you are the one responsible for knowing when to call them.

Can I get a building permit without a certificate of consent?

Not for owner builder work over $16,000. The certificate must be obtained first, and the building surveyor will require it.

Does owner building affect my home's energy rating requirements?

No. The 7 star minimum thermal rating and Whole of Home requirements apply to the building, not to who builds it.

Sources

Sultan Baloch
Next

Handover, Practical Completion and the Defects Period Explained