Stamp duty is one of the largest one-off costs in any NSW property purchase, and the rules around modular homes confuse plenty of buyers. The short version is that you usually pay duty on the land, not the home itself, because a modular home is technically goods until it lands on the foundation. The longer version has a few nuances worth understanding before you sign anything.
In NSW, transfer duty (stamp duty) is levied by Revenue NSW on the dutiable value of a property transaction. For a modular home build on land you already own, there is no duty event on the modular home itself, because no land transfer is occurring. You bought the land already. The home being built on top is a building contract, not a land transfer.
If you are buying land specifically to put a modular home on, you pay duty on the land purchase based on the land's market value (or contract price if higher).
You commission a Hi-Tech modular home for your block. No new stamp duty event. The build is a building contract, not a land transfer.
You pay transfer duty on the land at the relevant NSW duty rate. Then no further duty on the modular build itself. Many first-home buyers and tree-changers take this path.
You pay transfer duty on the land component of the package. Our house and land packages structure the contracts so the duty applies only to the land, not the bundled total. The savings vs an established home of the same total value can be meaningful.
If you buy an already-built property that happens to have been factory-built originally, you pay transfer duty on the total purchase price the same as any established home. At that point it is just a residential dwelling like any other.
NSW transfer duty is calculated on a sliding scale. The rate increases as the dutiable value rises, with several brackets. For most modular buyers, the land portion sits in the lower-to-mid range of the duty curve, so the cost is meaningfully less than for an established home where you are paying duty on land plus structure.
Use the Revenue NSW transfer duty calculator with your land value to get an exact figure for your situation. For broad budgeting, expect somewhere in the low to mid 5-figure range on a typical NSW residential block in 2026, before any first-home buyer concessions.
If you are a first-home buyer, NSW offers a full stamp duty exemption or concession under the First Home Buyer Assistance Scheme for purchases up to certain value thresholds. For many modular buyers, this means zero or very low stamp duty on the land. Combined with the natural cost advantage of modular construction, the upfront cost barrier drops significantly.
The First Home Buyer Choice scheme also lets eligible buyers swap stamp duty for an annual property tax. We have a separate post that breaks down whether this makes sense for modular buyers specifically.
If you are building a modular home as an investment property, the first-home buyer concessions do not apply. You pay full duty on the land portion. The good news is the cost advantage of modular vs traditional construction often more than offsets duty, especially in regional NSW where land costs are lower.
Adding a granny flat to your existing property does not trigger a duty event. You already own the land. The granny flat is a building contract, the same as a renovation. This is one reason a factory-built granny flat is such an efficient investment for NSW homeowners with extra space.
Transfer duty in NSW is generally payable within three months of contract exchange for the land purchase. Your conveyancer or solicitor handles the calculation and payment to Revenue NSW. Make sure your budget includes it as a settlement cost, not a long-term financed cost.
The two mistakes we see often:
Modular home buyers in NSW generally pay less stamp duty than equivalent traditional home buyers, because duty applies only to the land. First-home buyer concessions stack on top. For most clients, the total duty bill is a fraction of an established home of comparable size and quality.
If you want help thinking through the duty side of your project, get in touch with us. We will refer you to NSW conveyancers who handle modular transactions every week, and we will walk you through how our structured Hi-Tech process keeps your costs clear from day one.
