Galvanized Steel Flat Pack Container House | 20FT and 40FT Prefab
Modular Building Units
Volume-ready flat pack container house built on a hot-dip
galvanized Q345B steel frame with 75mm insulated sandwich panel
walls and roof, available in 20FT and 40FT configurations for
scalable multi-site procurement and rapid on-site assembly.
Product Overview
The flat pack container house is a factory-produced modular
building system shipped in a disassembled panel-and-frame format
that stacks compactly inside standard shipping containers,
significantly increasing the number of units per container load
compared to fully assembled box units. The structural system is
based on a hot-dip galvanized Q345B steel corner post and beam
frame with bolt-connected joints, allowing a four-person crew to
erect a complete 20FT unit in under three hours using hand tools
and a small crane without specialist technical skills.
Wall and roof panels consist of 75mm EPS or rock wool insulated
sandwich panels with 0.426mm color-coated steel facings on both
sides, delivering reliable thermal separation and weather
resistance across tropical, arid, and cold-climate deployment
zones. The 40FT variant provides a full 29.6 m² net floor area
suitable for larger office configurations, multi-bed dormitory
layouts, or combined utility and living spaces. Both sizes share
the same panel and connector system, allowing mixed procurement
orders to share spare parts and on-site assembly tooling across a
project portfolio.
Key Features
- Flat pack format increases shipping density — up to 6 units per
40HQ container versus 1 unit for box-type
- Hot-dip galvanized Q345B steel frame with bolt-node connections —
no welding required on site
- 20FT and 40FT standard sizes share identical panel dimensions and
connector hardware
- 75mm EPS or rock wool sandwich panels achieve U-value ≤ 0.45 W/m²K
for climate-controlled interiors
- 0.426mm color-coated steel panel skins provide UV resistance and
surface durability in outdoor exposure
- Aluminum alloy double-glazed sliding windows with powder-coat
finish and security locks
- 50mm insulated steel security door with multi-point latch, pre-hung
in factory-assembled frame
- 18mm moisture-proof plywood subfloor with anti-slip PVC surface,
250 kg/m² floor load rated
- Pre-routed 220V electrical conduit with distribution board,
breakers, LED strip fixtures, and socket outlets
- Modular bathroom and kitchen pod options connect to external water
supply and drainage without structural modification
- Units can be joined laterally or stacked two high using standard
twist lock connectors
- CE certified structural system with 15-year anti-corrosion warranty
on galvanized frame
Technical Specifications
| Parameter Item | 20FT Specification | 40FT Specification |
|---|
| Exterior Dimensions | 6,055 × 2,435 × 2,800 mm | 12,192 × 2,435 × 2,800 mm |
| Net Interior Floor Area | Approx. 13.5 m² | Approx. 29.6 m² |
| Interior Ceiling Height | 2,500 mm | 2,500 mm |
| Units per 40HQ Container | Up to 6 units | Up to 3 units |
| Main Frame Material | Q345B hot-dip galvanized steel, 3.5 mm wall thickness, bolt-node
joints |
| Wall Panel | 75 mm EPS or rock wool sandwich panel, 0.426 mm color steel both
sides |
| Roof Panel | 75 mm EPS sandwich panel with 1.0 mm TPO waterproof membrane
overlay |
| Floor System | 18 mm moisture-proof plywood + 2 mm anti-slip PVC, 250 kg/m² load
rating |
| Wall Thermal U-Value | ≤ 0.45 W/m²K (rock wool option ≤ 0.38 W/m²K) |
| Windows | Aluminum alloy sliding, 5+9A+5 mm double glazed, powder-coat finish |
| Entry Door | 50 mm insulated steel, multi-point latch, factory pre-hung frame |
| Electrical System | 220V / 50Hz, pre-routed PVC conduit, 1× distribution board, 6×
sockets, 4× LED fixtures |
| Wind Load Rating | Level 10 (≤ 28.4 m/s sustained) |
| Snow Load Capacity | 0.5 kN/m² |
| On-Site Assembly Time | 2–3 hours (4-person crew) | 3–4 hours (4-person crew) |
| Stacking Capacity | 2 stories with twist lock connectors |
| Frame Corrosion Warranty | 15 years (hot-dip galvanized coating) |
| Design Service Life | ≥ 20 years under standard use conditions |
| Certification | CE structural certification; SGS inspection available on request |
| Optional Upgrades | Rock wool panel upgrade, bathroom pod, kitchen module, AC bracket,
solar mounting rail, furniture package |
Applications
- Construction site management offices and on-site meeting room
blocks
- Worker dormitory camps for large-scale civil, energy, and
infrastructure projects
- Mining and quarry site accommodation with repeatable multi-unit
procurement
- Oil and gas field temporary living quarters requiring fast
commissioning
- Industrial park guard booths, reception counters, and security
checkpoints
- School and training center classroom expansion in remote or
under-served areas
- Warehouse annexes and on-site tool storage facilities for logistics
operations
- Disaster response and humanitarian relief shelter programs
requiring volume delivery
Frequently Asked Questions
How many flat pack units fit inside a standard 40HQ shipping
container?
Up to six 20FT units or up to three 40FT units can be loaded into a
single 40HQ container. This shipping density is the primary cost
advantage of the flat pack format over pre-assembled box-type
container houses, which ship one unit per container load.
What tools and equipment are needed for on-site assembly?
A four-person crew, standard hand tools, an electric impact wrench,
and a small 3-ton crane or telehandler are sufficient to erect a
complete 20FT unit in two to three hours. No welding equipment,
specialist trades, or heavy machinery are required.
What is the difference between EPS and rock wool panel options?
EPS panels offer a lower unit cost and are suitable for moderate
climates and short-to-medium deployment durations. Rock wool panels
provide superior thermal insulation (U-value ≤ 0.38 W/m²K), Class
A1 fire resistance, and better acoustic performance, making them
the preferred choice for permanent-style camps, cold climates, and
projects with fire safety compliance requirements.
Can the 20FT and 40FT units be connected side by side on site?
Yes. Units share compatible end-wall panel dimensions and can be
joined laterally with a shared corridor opening or directly
connected through a cut end panel. Mixed 20FT and 40FT layouts can
form L-shaped, U-shaped, or linear building blocks depending on
site configuration requirements.
What information is needed to receive a volume quotation?
Please provide destination port, total unit quantity, size mix
(20FT / 40FT ratio), panel type preference (EPS or rock wool),
intended use (office, dormitory, warehouse, or mixed), electrical
standard (voltage, frequency, plug type), and optional upgrade
requirements. FOB pricing with per-unit and total cost breakdown
will be returned within 24 hours.
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