Tiny Home Import Costs in Australia: A Worked Example

Last updated August 2026 · Figures drawn from Australian Border Force, the ATO, the Australian Building Codes Board and the Department of Agriculture

Almost every budget blowout in this space traces back to the same mistake: budgeting from the factory quote instead of the landed, approved cost. In the worked example, the factory price is only one part of the total, and most of the difference is spent on people who never touch the building — surveyors, engineers, assessors, certifiers and brokers.

This page itemises every line, in the order you actually pay it.

The full cost stack: a worked example

Assumptions: a $40,000 USD two-bedroom expandable unit, fixed dwelling (not on wheels), standard soil, no bushfire overlay, rural block on an on-site wastewater system, mains power nearby.

Indicative only. Costs vary by state, council, site conditions and provider. These are not quotes.

Stage one: before you order anything

This is the stage people skip, and skipping it is how deposits get lost on units that were never approvable on the land in question. Everything here should happen before you pay a factory deposit.

• Boundary and contour survey — $1,000 to $3,000. Your certifier and engineer both need it.
• Geotechnical soil test — $400 to $1,500, most suburban blocks landing $500 to $900. This determines your footing design, one of the largest swing factors in the entire budget.
• BAL bushfire assessment — only if your site is in a designated bushfire prone area, but check rather than assume. A high rating can make an imported design effectively unusable.
• Wastewater site and soil evaluation — $800 to $2,500 if you are not on mains sewer.
• Certifier pre-purchase review — $200 to $600 for an hour or two of a building certifier's time reviewing the factory's documentation.

Stage two: design and approval

• Structural engineering review — $2,000 to $6,000 or more. An Australian engineer must certify the design against Australian wind loading for your region. If the factory documentation is thin, this becomes a redesign rather than a review, and this is the item most likely to blow out on an imported unit.
• NatHERS energy assessment — $250 to $500 for straightforward assessments. Overseas glazing and insulation specifications may not satisfy the energy-efficiency requirements applicable to your project, including any required star rating or other compliance pathway. A qualified Australian professional should confirm the requirements before order. outcome without upgrades, and a failed first assessment means paying again after changes.
• Building certifier package — roughly $700 to $3,000 in Queensland; $2,000 to $6,000 in New South Wales, with full Sydney packages commonly $3,500 to $5,000.
• Council lodgement fees — $130 to $800 depending on jurisdiction.

Stage three: import and the border

Customs duty

Prefabricated buildings sit under tariff heading 9406. The standard rate for most Chinese goods is 5 per cent of the customs value, but this reduces to zero under the China–Australia Free Trade Agreement if you hold a valid Certificate of Origin issued by an authorised Chinese body.

Ask your supplier for the Certificate of Origin at order stage and make it a condition of contract. On a $60,000 unit, forgetting it costs roughly $3,000 for a document worth about $100.

GST, and when a GST credit may or may not be available

GST is 10 per cent of the value of the taxable importation — the customs value, plus any duty, plus what you paid for international transport and insurance. On a $60,000 unit with freight, that is comfortably over $7,000, payable before the goods are released.

If you are a private buyer not registered for GST, you do not get this back. You can only claim a GST credit if you are registered and importing for a creditable purpose. This single line catches more people than any other.

Broker, port and container charges

• Customs broker — commonly $165 to $260 per shipment.
• Import Processing Charge — around $200 for sea freight consignments valued over $10,000.
• Port charges — indicatively $700 to $800 for a 40-foot container, plus terminal handling of roughly $200 to $500.
• Container detention — roughly $85 to $120 per day plus GST once the free period ends, usually about a week. This is the sleeper cost: if your site is not ready or your crane is not booked, the meter runs the entire time.
• Biosecurity — inspection fees commonly $150 to $400. Rural deliveries generally require a departmental rural tailgate inspection, and most tiny home sites are rural.

Stage four: site works and connection

This stage is where the variance is genuinely too wide to average honestly, so what follows is method rather than a single number.

• Footings and slab — designed to suit your soil classification. A reactive clay site can cost multiples of a good sand site for identical footings. You cannot budget this until the soil test is in hand.
• Wastewater — a conventional septic system typically runs $5,000 to $15,000 installed; an aerated treatment system roughly $11,000 to $16,000, with figures up to $25,000 for complex installs. Council application and inspection fees add $300 to $800. In most states self installation is illegal.
• Electrical — assume substantial rewiring to Australian wiring rules, certified by a licensed electrician. Chinese domestic practice differs on cable sizing, colour coding, earthing and RCD provision. Do not accept a quote sight unseen.
• Plumbing — budget to replace factory-fitted tapware, valves, waste outlets and water heater with WaterMark certified equivalents. A licensed plumber cannot legally install non-certified products where the Plumbing Code requires certified ones.
• Craneage and services connection — entirely dependent on site access and distance from existing infrastructure. On a rural block this can be trivial or the largest line item in the project.

The five costs that blow budgets

1. GST on the import. In the worked example it is over $7,000. GST-credit eligibility depends on registration and whether the import is a creditable importation.
2. Footings on bad soil. Unknowable until the soil test, capable of adding tens of thousands.
3. Structural engineering when factory documentation is inadequate and a review becomes original design work.
4. Electrical work. Allow for Australian electrical assessment and any rectification required for the specific unit.
5. Container detention while the site is not ready — a risk that can sometimes be reduced with better sequencing.

Some of these risks can be reduced by doing more due diligence and project planning before you order. Others remain site- and project-dependent.

Common questions

Verify this yourself

Every figure on this page is checkable against the primary source. Government fees change without notice — confirm current charges at the time you import.

• Duty rates, tariff classification and asbestos prohibition — abf.gov.au
• GST on imported goods — ato.gov.au
• Certificate of Origin under ChAFTA — dfat.gov.au
• Biosecurity import conditions (BICON) — agriculture.gov.au
• National Construction Code — ncc.abcb.gov.au
• Energy ratings — nathers.gov.au
• WaterMark certified plumbing products — watermark.abcb.gov.au
• Electrical equipment safety — eess.gov.au