A home that comes in two modules is two deliveries and one join. It needs a second truck and a second crane lift, a line of piers under each module, services run between them, and the join itself: the marriage line where the two meet, the flashing, the roof and wall join, and the finish inside. Joining alone runs $8,000 to $15,000 inc GST in South East Queensland and adds two to four days on site, and the second pier line and second lift sit on top of that in their own buckets. The reason to accept all of it is width: a single module is limited by what fits on a road, and two modules side by side make a home wide enough for a proper living room and two bedrooms.
Why homes come in two pieces
A module travels on a truck, and in Queensland a load wider than 3.5 m or longer than 25 m needs a pilot vehicle, with more escort and more permit the wider it goes. Makers hold single modules to about 3.4 to 4.5 m wide for that reason. A two-module home can be 7 to 9 m wide, which is a different house: rooms side by side, a hallway, a bathroom off a bedroom rather than off the kitchen. The cost of the join is the price of that width.
What the second module adds
| Line | What changes | Cost, inc GST |
|---|---|---|
| Footings | A pier line under each module, so twelve to eighteen piers instead of six to eight | $800 to $1,200 a pier |
| Delivery | Two trucks, two pilots if the modules are wide | Delivery is priced per module |
| Crane | Two lifts in one day where access allows; a bigger crane for a heavier module | Inside the $8,000 to $38,000 delivery and crane range |
| Joining | The marriage line, flashing, roof and wall join, floor and ceiling finish across the line, two to four more days on site | $8,000 to $15,000 |
| Services | Plumbing and power run between the modules as well as to them | Inside the plumbing and electrical buckets |
What to ask the maker
- How the join is designed: who does it on site, and whether the maker's crew or the installer closes the roof.
- Whether the two modules can be lifted in one crane day from the one position, or whether the second needs the crane moved.
- Whether the home's engineering covers the two modules as one structure for wind and tie-down.
- What the maker's warranty says about the join, since it is the one part of the home not finished in the factory.
One module or two, on this site
Every home on the site shows its width and the number of modules, and the installed price for a two-module home carries the second pier line and the second lift. The calculator does the same for a chosen block, and adds the joining line only when two modules are picked.
See it for your block
- Compare homes by size and modules
- Install cost calculator, one or two modules
- Piers, slope and the second truck
Questions people ask next
How much extra does a two-module home cost to install?
Joining the modules runs $8,000 to $15,000 inc GST in South East Queensland, with two to four more days on site. On top of that the second module brings its own pier line, a second truck and a second crane lift, which sit in the footings and delivery buckets.
Why are modular homes limited in width?
Road transport. In Queensland a load wider than 3.5 m or longer than 25 m travels with a pilot vehicle and the cost rises with width, so makers keep single modules to about 3.4 to 4.5 m. Two modules joined on site is how a wider home is delivered.
What is the marriage line?
The line where two modules meet. On site it is flashed and sealed, the roof and walls are joined, and the floor and ceiling are finished across it. It is the one part of a two-module home not completed in the factory, so ask what the maker's warranty says about it.
- Queensland Government, sharing the road with oversize, pilot and escort vehicles, read 16 October 2026
- Installer rates: joining two modules, footings, delivery and crane (South East Queensland, 2026), read 16 October 2026
- What is in an install: joining and weatherproofing, read 16 October 2026