---
title: Owner-Builder and Kit Home Finance Australia | GNT Finance
description: Why lenders cap owner-builder loans at a low LVR, how kit and modular home deposits fall outside construction finance, and a worked progress payment example.
url: https://gntfinance.com.au/guides/owner-builder-and-kit-home-finance/
section: guides
updated: 2026-09-02
author: Gorakh Timilsina, GNT Finance
---

# Owner-builder and kit home finance

**In short:** Lenders treat owner-builder projects as their highest-risk construction lending. Without a licensed builder, a fixed-price contract or warranty insurance, the maximum loan-to-value ratio commonly falls to 50% to 70% of completed value, and several lenders decline entirely. Kit, modular and transportable homes add a second problem: the manufacturer wants a deposit before anything sits on your land, and lenders will not fund that.

Owner-building saves real money on labour and margin. It also removes every protection a lender relies on, so the finance is the hardest part of the plan and must be settled before you buy the land.

## Why lenders restrict owner-builder lending

A standard construction loan is secured by more than land. It is secured by promises from a licensed third party.

| | Registered builder | Owner-builder |
|---|---|---|
| Contract | Fixed-price major domestic building contract | No head contract; separate trade contracts |
| Cost certainty | Contract price, variations documented | Estimate only; overruns sit with you |
| Warranty insurance | Taken out by the builder | None during construction |
| Who finishes if it stalls | The builder, or the insurer | Nobody |
| Typical maximum LVR | Up to 90% or 95% with LMI | Commonly 50% to 70%; some decline |
| Valuation basis | "On completion" against the contract | "On completion", assessed conservatively |

The lender's exposure in a half-built house is the real issue. A slab, a frame and no roof is worth less than the vacant land it sits on, because the next buyer must demolish or complete it. With a registered builder there is a contract and an insurer behind completion. With an owner-builder there is you, and if you become unwell the project stops. That is the reason for the LVR cap, not a judgement about your skills.

## Owner-builder permits and obligations

Every state requires approval to act as an owner-builder on work above a value threshold, each with its own name, threshold and eligibility rules.

In Victoria you need a certificate of consent before a building surveyor will issue a building permit for domestic building work on land you own and intend to live on. The value threshold rose from $16,000 to **more than $20,000** effective 1 July 2026, and it is issued by the Building and Plumbing Commission (previously the Victorian Building Authority). There are limits on how often one person can be granted a certificate, and you are expected to live in the home. Confirm the current threshold with the regulator.

### The obligation that catches people on sale

If you sell an owner-built home within **six and a half years** of the occupancy permit or certificate of final inspection, and the work exceeded the threshold, Victorian law requires you to:

- take out domestic building insurance covering the work you carried out
- obtain a defects inspection report from a registered building practitioner, less than six months old at sale
- include the required warranty and insurance information in the [Section 32 vendor statement](/legal/section-32-vendor-statement/)

Insurers price that policy on a house they did not supervise, and some will not offer it where documentation is thin. Keep every permit, certificate and invoice from day one. Consumer Affairs Victoria sets out the rules for [owner-builders](https://www.consumer.vic.gov.au/housing/building-and-renovating/owner-builders).

## Kit homes, modular and prefabricated builds

A kit home is a package of materials delivered and assembled on site. A modular home is built in sections in a factory and craned onto a prepared base. Both cost less than a conventional build, and both create the same finance problem.

### The factory deposit problem

Manufacturers typically want 20% to 40% on order, with further payments as the modules are built. A construction lender releases funds against **works completed on the security property**. Until the modules are fixed to your land they are not part of that security: they are goods in someone else's factory, and if the manufacturer fails you may be an unsecured creditor.

So the factory payments come from your own cash, and lender funding starts once there is something on the land. On a $300,000 modular home with a 30% deposit, that is **$90,000** in savings before a dollar of the construction loan is drawn. The workarounds all have limits:

- **Fund the deposit from existing equity.** See the [equity calculator](/calculators/equity/).
- **A small number of lenders** have prefabricated-housing policies releasing funds against factory milestones, usually with a manufacturer's bond or bank guarantee.
- **Negotiate the payment schedule** so a larger share falls after delivery to site.
- **Specialist and non-bank lending** at a higher rate can bridge the gap. See [private and non-bank lending](/services/private-and-non-bank-lending/).

### Transportable homes

A transportable that remains removable, or sits on a leased site such as a lifestyle village or caravan park, usually cannot be mortgaged as real property. If the dwelling is not a fixture on land you own it is closer to a chattel than a house, and the finance is personal or asset finance instead.

## Worked example: an owner-builder project on a $380,000 block

You buy a block for $380,000 and plan to owner-build for $300,000 including trades, materials, permits and connections. Total project cost **$680,000**. The bank's on-completion valuation comes in at **$700,000**.

**Step 1: the lending limit**

Your lender caps owner-builder lending at 60% of the on-completion value.

- Maximum facility: 60% × $700,000 = **$420,000**
- Repayment on that facility for illustration, at 6.00% p.a. over 30 years: about **$2,518 a month**

**Step 2: the land settlement**

The lender releases 80% of the land price at settlement.

- Drawn at settlement: 80% × $380,000 = **$304,000**
- Your cash at settlement: $76,000 deposit + $17,870 stamp duty + about $2,500 in conveyancing and fees = **$96,370**

Victorian duty on $380,000 is $2,870 + 6% × ($380,000 − $130,000) = **$17,870**.

**Step 3: the construction draws**

- Facility remaining for construction: $420,000 − $304,000 = **$116,000**
- Your cash contribution to the build: $300,000 − $116,000 = **$184,000**

Lenders require your own funds to be spent first, so you fund the early stages and the lender funds the tail. Against the standard Victorian stage percentages:

| Stage | Share of build | Amount | Funded by |
|---|---|---|---|
| Deposit / commencement | 5% | $15,000 | You |
| Base | 10% | $30,000 | You |
| Frame | 15% | $45,000 | You |
| Lock-up | 35% | $105,000 | You ($94,000), lender ($11,000) |
| Fixing | 25% | $75,000 | Lender |
| Completion | 10% | $30,000 | Lender |
| **Total** | **100%** | **$300,000** | **You $184,000, lender $116,000** |

**Step 4: total cash required**

$96,370 at settlement + $184,000 during the build = **about $280,370**.

**Step 5: the comparison**

The same land with a $300,000 fixed-price contract and a registered builder, at 90% LVR of the $700,000 completed value:

- Loan: **$630,000**, repayment for illustration at 6.00% p.a. over 30 years about **$3,777 a month**
- Cash: $50,000 + $17,870 duty + about $2,500 costs = **about $70,370**, plus LMI of roughly $20,000, commonly capitalised

The difference in cash is **$280,370 − $70,370 = $210,000**. Owner-building saves the builder's margin and costs you access to leverage. Whether that trade works depends on how much cash you have, not how good you are with a nail gun. Model it with the [LVR calculator](/calculators/lvr/) and the [upfront costs calculator](/calculators/upfront-costs/), and read [construction loan progress payments](/guides/construction-loan-progress-payments/).

## Practical advice before you commit

1. **Get the finance answer before you buy the land.** A block bought assuming 90% construction lending is a problem if the project can only reach 60%.
2. **Budget a contingency of 10% to 15%.** With no fixed price, the overrun is yours and the lender will not increase the facility.
3. **Keep a complete document trail** — permits, inspections, compliance certificates, invoices — for the warranty insurance on sale.
4. **Understand the valuation risk.** Read [what to do about a low valuation](/guides/low-valuation-what-to-do/).
5. **Check the land first.** Vacant blocks in some postcodes carry LVR restrictions. See [postcode and location lender policy](/guides/postcode-and-location-lender-policy/) and [vacant land loans](/services/vacant-land-loans/).
6. **Compare against a [house and land package](/services/house-and-land-packages/)** on cash required, not headline cost.

## Frequently asked questions

### What LVR will a lender go to for an owner-builder?

Commonly 50% to 70% of the on-completion value, and several lenders will not lend to owner-builders at all. There is no fixed-price contract, no builder's warranty insurance and nobody contractually obliged to finish the house if the project stalls. Expect a conservative valuation too, which reduces the figure the percentage applies to.

### Can I get a construction loan for a kit home?

Yes for the on-site works, but not usually for the factory or supplier deposit. Construction lenders release funds against work completed on the land they hold as security, and materials sitting at a manufacturer are not part of it. Fund the order deposit from savings or equity, and confirm the drawdown schedule with a lender before you sign with a manufacturer.

### Can I borrow against a transportable home?

Only where it is permanently fixed to freehold land you own, on approved footings, with an occupancy permit. Then it is real property and normal residential lending applies. A transportable that remains removable, or sits on a leased site in a village or park, is funded through personal or asset finance instead, on shorter terms and higher rates.

### Do I need insurance to sell a home I built myself?

In Victoria, yes, if you sell within six and a half years of the occupancy permit or final inspection certificate and the work exceeded the value threshold. You must take out domestic building insurance for the work you performed, obtain a defects inspection report less than six months old from a registered building practitioner, and disclose the required information in the vendor statement. Confirm the current threshold with the regulator.

## Talk to GNT Finance

Owner-building and prefabricated builds are decided by cash flow, not enthusiasm. Bring us the block, the build estimate and the payment schedule, and we will show you what each lender will fund, when, and what you need in the bank at every stage.

[Book a free consultation](/contact/) or call 0426 403 703.

*This page is general information only and not legal, tax or financial advice. Laws change — confirm current rules with the State Revenue Office, the ATO or a licensed professional.*