Complete Guide to Prefab Construction Cost Estimation
The Prefab Cost Calculator helps builders, developers, and homeowners estimate modular homes, panelized systems, or bathroom/kitchen pods. It includes factory build, transport, crane, foundation, and assembly. Our free tool uses industry rates for accurate budgeting vs traditional stick-built.
What is Prefab Cost Calculation?
Prefab cost includes factory construction (60–70% of total), transport, crane setup, foundation, and on-site finish. Average $100–$250 per sq ft installed. Our Prefab Cost Calculator breaks down each component.
Why Choose Prefab Construction?
Benefits include:
- Speed: 50% faster than site-built.
- Quality: Factory-controlled environment.
- Waste Reduction: 30% less material waste.
- Cost Predictability: Fewer change orders.
Pair with Foundation Cost and Home Addition Cost for full project.
How to Calculate Prefab Cost
Step-by-step:
- Factory Build: $80–$160/sq ft for modular.
- Transport: $3–$10/sq ft per 100 miles.
- Crane: $2,000–$10,000 per lift.
- Foundation: $5–$60/sq ft.
- Assembly: $20–$40/sq ft.
Example: 1500 sq ft modular home = $180,000–$350,000 total.
Average Prefab Costs by Type
| Type | Factory Cost | Total Installed |
|---|---|---|
| Modular Home | $80–$160/sq ft | $150–$300/sq ft |
| Panelized Walls | $50–$100/sq ft | $100–$200/sq ft |
| Bathroom Pod | $8,000–$25,000/unit | $12,000–$35,000 |
| Kitchen Module | $15,000–$40,000/unit | $20,000–$55,000 |
Key Factors Affecting Cost
- Distance: Over 200 miles adds permits.
- Site Access: Crane reach and soil.
- Customization: Standard vs custom.
- Local Codes: Seismic or hurricane zones.
Practical Applications
Used for:
- ADUs: Granny flats with modular.
- Multi-Family: Stacked bathroom pods.
- Remote Sites: Panelized for access.
- Renovations: Drop-in kitchens.
Tips to Save on Prefab
- Standard Designs: Avoid custom changes.
- Local Factory: Minimize transport.
- Bundle Modules: Volume discounts.
- Early Planning: Site prep before delivery.
Common Mistakes
- No Site Prep: Delays crane.
- Wrong Foundation: Mismatch with modules.
- Permit Delays: Prefab needs early approval.
- Utility Hookup: Forgotten in budget.
Advanced Considerations
- Net-Zero Prefab: With solar integration.
- Volumetric Modular: Full rooms shipped.
- BIM Modeling: Clash detection pre-factory.
- Contingency: Add 10% via Contingency Calculator.
Conclusion
Prefab construction offers speed, quality, and cost control. Our Prefab Cost Calculator delivers instant estimates with full breakdown. Combine with Foundation, Total Project Cost, or Home Addition tools for complete off-site planning. Build smarter with 1000 Calculators.