Short answer
For a single container house on firm, drained ground, concrete piers or blocks under the corners are usually the best foundation; multi-storey blocks need concrete strip footings, and soft or sloping ground suits screw piles. A concrete slab is best for toilet and shower units and long-term homes where drains run under the floor. A local site engineer confirms the choice after checking your soil, and we mark the base positions on our layout drawing.
Best Foundation by Unit Type
| Unit | Usual best base | Why |
|---|---|---|
| Folding unit, 5900 × 2450 mm | Piers or blocks; compacted gravel for short stays | A single unit that is often moved |
| Flat pack unit, single | Piers or blocks | Needs no hardened foundation, only level support |
| Flat pack block, multi-storey | Strip footings under the column rows | Each column carries the units above it |
| 20 ft expandable, about 2,500 kg | Slab or piers across the 6300 × 5900 mm opened area | The side sections open out onto the base |
| 40 ft expandable, about 6,000 kg | Slab or strip footings across the 6300 × 11800 mm opened area | More weight over a longer base |
| Toilet and shower units | Concrete slab | Drain pipes run under the floor |
Sizes and weights from our catalogues.
Best Foundation by Ground Type
| Ground | Usual best base |
|---|---|
| Firm, dry and level | Piers or blocks; compacted gravel for temporary single units |
| Soft clay or filled ground | Screw piles, or a slab designed by your engineer |
| Sloping | Piers of different heights, or screw piles |
| Wet or with a high water table | Raised piers or screw piles, with drainage around the base |
| Cold, with ground frost | Footings below the local frost depth |
General building practice; your site engineer sets sizes and depths.
One base type rarely fits a whole camp: multi-storey dormitory blocks may sit on strip footings while the guard house and stores sit on piers. We mark each base on the same drawing.
Who Confirms It
A local site engineer checks the soil, wind exposure and local building rules, and sizes the base. We do not design foundations for your soil from a distance, and we will not guess. What we provide is the input your engineer needs: unit weights (about 2,500 kg for a 20 ft expandable unit, 4,000 kg for 30 ft, 6,000 kg for 40 ft), the footprint of every unit, the base positions and the water, drain and power connection points.
Contractors, dealers and private buyers can send us the site size, a few photos of the ground and the units they want. We reply within one working day with a layout drawing, a container loading plan and an FOB China quote, so your engineer can design the base while we build the units in our Shandong and Guangdong factories.
Frequently Asked Questions
Do I need a full concrete slab?
Usually not. A level, firm, drained base under the frame is enough for most units, and our flat pack units need no hardened foundation. A slab is worth it for toilet and shower units and long-term homes.
Are screw piles good for container houses?
Yes on soft or sloping ground and on sites that must be restored later, because they come out again. They need a local installer and a soil check.
Is gravel enough for a container house?
For a temporary single unit on firm ground, a compacted gravel bed can be enough. It is not used under multi-storey blocks.
Why Buyers Choose Cabinrise
We are a container house manufacturer with production bases in Shandong and Guangdong, China. Expandable, folding and flat pack houses, offices, guard houses and toilet units all come from our factories - so a whole camp, office block or home can be one order, drawn on one layout and shipped to your port. Every quote comes with a layout drawing and loading plan, standard sizes can be mixed in one order, and you are welcome to visit the factory or tour it by video first.
- Factory-direct from Shandong and Guangdong
- Layout drawing and loading plan with every quote
- Mixed sizes in one order
- Factory visits and video tours welcome
- Written and video installation guides