| Requirement | What it means in practice | If it is not met |
| Bearing capacity | 100 kN/m² under each pad, or a concrete curb | One soft corner settles and the door drags within a fortnight |
| Level | 5 mm across 5.8 m, checked with a hose or laser | The wall binds at the top hinge and the pins will not drive |
| Pad spacing | 2 m centres maximum under the sill | The sill bows and the floor feels springy underfoot |
| Clearance under sill | 150 mm, on pads or a curb | Splash wets the bottom rail and the coating fails first |
| Drainage | Fall away from the unit on all four sides | Water stands under the floor and the board swells |
| Access width | 3.5 m for the truck, 12 m turning circle | A crane has to be hired outside the budget |
| Hard standing | Compacted gravel or concrete at the unloading point | The forklift sinks and the pack comes down hard |
| Overhead clearance | 6 m for the crane or the forklift mast | Forks cannot clear the container floor |
| Wind at the fold | Under 40 km/h during the wall lift | A 120 kg wall becomes a sail, stop and wait |
| Power supply | 63 A single phase at the unit, or a generator | The unit stands finished and dark, with handover blocked |
| Earthing | Electrode within 20 m of the unit | The electrician cannot sign the test sheet |
| Water supply | 15 mm connection, 0.2 MPa minimum | A paid wet pod sits unusable |
| Drain connection | 50 mm PVC to a soakaway or sewer | Grey water runs under the floor and smells |
| Posádka | Three people for the roof lift, two for the rest | Two people lift the roof and the frame racks |
| Tools | 13 mm socket, brass drift, rubber mallet, level | Improvised tools chew the pins and the panel edges |
| Forklift rating | 3.5 t at 2.5 m reach | 2.5 t is rated to 900 kg at that reach, pack drops |
| Site security | Lockable from day one | Fittings disappear before the client takes the key |
| Fire access | 3.5 m wide route to within 30 m | The camp fails inspection before anyone moves in |
| Spacing between units | 3 m for maintenance and fire, 6 m for kitchens | A panel cannot be changed without moving a unit |
| Inspection slot | Booked before assembly, not after | Paperwork holds occupancy for a week |
| Handover time | Two hours with the client present | Snags pile up when nobody walks the rooms |
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Email：liwenfan211@gmail.com
