How Are Expandable Prefabricated Houses Assembled?

1. Preparation Before Assembly

Before the prefab house arrives on-site, several preparatory tasks must be completed:

1. Ground Foundation Setup
Though these houses use lightweight steel structures, a solid foundation is still essential for safety. Typically, a concrete strip foundation or precast blocks are used to ensure the ground is level and capable of bearing the load.

2. Site Cleaning and Measurement
Clear the area of debris, measure and mark the layout to ensure the installation position is accurate.

3. Materials & Tools Check
Inspect all incoming parts to make sure everything is accounted for — steel frames, wall panels, windows, doors, electrical components, expandable units, etc. Prepare necessary tools such as cranes, drills, and wrenches.

2. Main Structure Installation

This is the most critical step in the entire process:

1. Steel Frame Assembly
The main structure is usually made of high-strength galvanized steel that has been pre-fabricated in the factory. On-site, the base beams, columns, and top beams are bolted together according to the design, forming the basic frame of the house.

2. Floor and Roof Installation
Once the frame is in place, floor and roof panels are installed and secured with fasteners, turning the structure into a stable box unit.

3. Expanding the Modular Units

This is what sets expandable houses apart from standard container houses:

1. Unfolding the Expandable Sections
After the core module is lifted into position, expandable sections on one or both sides are unfolded — often using folding panels or sliding components. These are pre-installed in the factory and only require minimal manual or mechanical assistance to deploy.

2. Securing Walls and Sealing Gaps
Once unfolded, walls are locked into place using connectors or latches. Weatherproof sealing strips are added to ensure the house is wind- and waterproof.

4. Interior & Exterior Finishing

1. Installing Wall Panels, Doors, and Windows
Install the sandwich panels, insulation layers, cladding panels, doors, and windows to complete the exterior.

2. Electrical and Plumbing Installation
Set up the distribution box, sockets, lighting, plumbing, and bathroom equipment as needed. Most conduits and pipe routes are pre-reserved in the panel system, making installation quick and efficient.

3. Interior Decoration
Optional features like flooring, ceilings, and furniture can be added to enhance comfort and functionality, depending on client requirements.

5. Final Inspection & Handover

Once everything is installed, a final inspection is carried out to check structural safety, electrical circuits, plumbing systems, and overall usability. After passing all tests, the house is ready to be handed over for use.

Conclusion

The assembly process of an expandable prefabricated house is efficient, systematic, and reflects the advancement of modern industrialized building practices. With standardized production, modular transport, and rapid on-site installation, it significantly shortens construction time and reduces overall costs.

Whether for temporary or semi-permanent use, expandable prefab houses are a smart, flexible solution. If you have any questions or would like a customized design, feel free to contact us — we’re here to help you find the perfect modular solution!