Self-Built Prefabricated House Construction Process

The construction process of a self-built prefabricated house mainly includes six stages: application and approval, geological survey, design and team selection, foundation construction, main body assembly, and subsequent construction, as detailed below:

1. Application for Homestead and Approval Processing
Submit a written application to the village committee on a household basis, specifying the reasons for construction, land location, area, and number of floors. After village-level review and publicity, as well as approval by township authorities, obtain the 'Rural Construction Planning Permit' and 'Rural Homestead Approval Certificate' before commencing construction. This stage ensures the legality of land use and avoids subsequent disputes.

2. Geological Survey
Conduct a professional survey to determine soil bearing capacity and groundwater level, thereby selecting an appropriate foundation type: strip foundations for ordinary soil, raft foundations for soft or sandy soil, and pile foundations for shallow groundwater or sloped terrain. Survey results directly impact the structural safety of the house and are a prerequisite for foundation construction.

3. Design Drawings and Team Selection
Commission a designer to complete detailed house designs, obtaining a full set of construction drawings including structural and architectural plans. Select an experienced and reputable construction team, sign a detailed contract specifying the construction period, cost, and quality standards. Drawings must undergo professional review, and the construction team's qualifications must meet requirements.

4. Foundation Construction

• Setting Out and Positioning: Accurately mark the house location on the homestead according to the drawings, with the homeowner confirming boundaries on-site.
• Excavation of Foundation Trench: Dig to the designed depth along the marked lines.
• Pouring of Cushion Layer: Pour a 10-centimeter-thick concrete cushion layer to provide a level working surface.
• Main Body Construction: Bind reinforcement bars, install formwork, pour concrete, and remove formwork for curing after solidification.
• Backfilling: Backfill with clean plain soil in layers and compact to ensure foundation stability.

5. Assembly of Prefabricated House Main Body

• Installation of Foundation Piles and Beams: After concrete solidification, install footplates and secure them with expansion screws; hoist each prefabricated foundation pile, weighing approximately 5 tons, through reserved holes; adjust horizontally and secure beams with nuts, filling gaps with foam and sealing with cement.
• Installation of Other Components: Hoist stairs, lay a 5-centimeter-thick floor slab, and finally grout and reinforce all gaps.

6. Subsequent Construction

• Pipe Embedding: After backfilling, excavate and embed sewage pipes to avoid damage during compaction.
• Damp-Proofing Treatment: Lay geotextile membrane on the backfill surface, which offers superior damp-proofing compared to ordinary plastic sheeting.
• Floor and Roof Construction: For flat roofs, build parapet walls and apply waterproofing; for attics, use steel or wooden structures with either cast-in-place or tiled roofs.
• Main Body Decoration: Complete interior and exterior wall plastering, bathroom waterproofing, water and electricity installation, exterior wall insulation, and painting.