A prefab house is built from factory-made components (frames, wall/roof panels, floors) that are transported and assembled on site. In Nepal, they’re popular for homes, offices, schools, and site housing because they’re faster to build and easier to plan than conventional masonry/RCC—provided the materials and installer are reliable.
Advantages
- Faster build time with predictable timelines and fewer weather delays.
- Cost clarity from standardized components and reduced on-site labor.
- Good seismic behavior when the structure is properly designed, anchored, and braced.
- Cleaner “dry” construction with less dust, debris, and water use.
- Flexible layouts; modules can be reconfigured or extended later.
- Energy efficiency possible with the right insulation and airtight detailing.
- Consistent quality thanks to factory manufacturing and repeatable specifications.
- Minimal disruption at the site—useful in dense neighborhoods or institutions.
Disadvantages
- Design freedom is not unlimited; extreme custom shapes or spans may be costly.
- Performance depends heavily on installer skill and detailing (moisture, flashing, joints).
- Thermal/acoustic comfort varies by spec; low-grade panels may underperform.
- Transport and site access constraints (narrow roads, steep approaches) can add cost/time.
- Perception issues: some buyers still prefer “solid” masonry; resale may require education.
- Local approval/permit processes may require extra documentation of specs and tests.
- Future modifications (openings, heavy fixtures) must respect structural members and services.
