20ft vs 30ft vs 40ft Expandable Homes
All three lengths fold down to the same transport width and height, then open up to the same 6.42m width on site. The real differences are length, floor area, how many people each suits, and what your site can accommodate.
Side-by-side comparison
| Length | Transport size | Expanded size | Floor area | Suits | Price guide |
|---|---|---|---|---|---|
| 20ft | L 5.90m × W 2.26m × H 2.52m | L 5.90m × W 6.42m × H 2.25m | 37 m² | 1–2 adults or 2 adults + 1 child | A$20,000–A$26,900 depending on model |
| 30ft | L 9.00m × W 2.26m × H 2.52m | L 9.00m × W 6.42m × H 2.25m | 56 m² | Small family (2–4) | Approx. A$36k–A$45k depending on configuration |
| 40ft | L 12.00m × W 2.26m × H 2.52m | L 12.00m × W 6.42m × H 2.25m | Approx. 72–76 m² depending on model/configuration | Family (3–5) | From approx. A$38k for the standard version; higher-spec versions quoted separately |
Prices depend on layout, specifications and upgrades, so a higher-spec smaller model may cost more than a standard larger model.
Which size suits you?
20ft: compact living for one or two
At 37 m², the 20ft is our most common size for granny flats, guest rooms and backyard studios. There are several layouts, from a single large bedroom suite to a compact two-bedroom plan. It is also the easiest length to deliver onto tighter suburban blocks.
20ft models include the 20FT Single Bedroom Suite, 20FT Luxury Tiny Home, 20FT Two Bedroom Home, Durable Tiny Home (Full Roof) and Granny Flat.
30ft: room for a small family
The 30ft adds about 50% more floor area (56 m²) and suits a small family of 2–4. It is a good fit when you need a second bedroom and a proper living area, but your block can't take a 12m home.
40ft: family living
The 40ft offers approx. 72–76 m² depending on model/configuration and suits a family of 3–5. Configurable as 2–3 bedrooms, bathroom, and kitchen depending on layout. It needs the most space on site, both for delivery and for the finished footprint.
Floor area varies by configuration. The 40ft collection lists 76 m², while the 40FT Family Deluxe lists 72 m². These figures may measure different things, such as external footprint or internal usable area, so compare the specification sheet for the exact model you are considering.
What length means for your site
Every size travels at the same 2.26m width and 2.52m height, so the width and height you need for access are the same. Length is what changes: 5.90m, 9.00m or 12.00m. A longer home needs more room to turn, a longer clear path to its final position, and more footings underneath.
On narrow or tight-turning blocks, a longer home is more likely to need a crane. Check your access against our site preparation guide before you settle on a length.
Add-on prices by size
Listed add-ons cost more on the 30ft and 40ft because they cover a larger home.
| Add-on | 20ft models | 30ft and 40ft models |
|---|---|---|
| Pitched roof | A$4,500 | A$6,000 |
| External cladding | A$3,000 | A$3,500 |
| Front porch with decking | A$3,000 | A$3,000 |
| Front decking (2m x 6m) | A$2,000 | A$2,000 |
| Gutter system | A$1,500 | A$2,000 |
| Registerable trailer | A$12,000 | A$15,000 |
For the full picture, including delivery, footings and connections, see how much an expandable home costs in Queensland.