1. What defines warehouse/factory builds
They need large column-free spans, high ceilings and routes for big vehicles. So light, long-spanning steel (S) structure dominates, and system-building for short schedules and cost optimisation is common.
2. Zoning and location
Factories face strong locational limits by industrial / exclusive-industrial / quasi-industrial zoning. For logistics warehouses, access to expressway interchanges and arterials drives value. Confirm permitted use and size first (building regulations).
3. Structure — steel and long spans
Steel suits big spaces; span, loading (storage, forklifts) and ceiling height are designed to the use. Factories with heavy goods or cranes need careful floor loading and structural calculation.
4. Fire and hazardous materials
By use, warehouses/factories face strict fire equipment (alarms, sprinklers, fire compartments); handling flammables/chemicals makes it a hazardous-materials warehouse under the Fire Service Act. Confirm fire consent and hazmat handling early (fire safety).
5. Cost and schedule guideline
| Use | Per tsubo (guide) | Schedule (guide) |
|---|---|---|
| Warehouse (standard) | approx. ¥0.3–0.6M | 6–12 months by scale |
| Factory (with equipment) | approx. ¥0.4–0.8M | longer with plant |
Insulation, HVAC and special equipment swing this a lot; office annexes and energy requirements push it up.
Common pitfalls
| Risk | Prevention |
|---|---|
| Plan unviable for unchecked zoning | Confirm zoning and coverage/FAR of the site first |
| Floor load/ceiling height mismatched to use | Design back from operations (loads, vehicles, cranes) |
| Missed hazmat/fire rules delay opening | Confirm fire and hazmat handling early |
| Cheapest quote wins; insulation/equipment short | Compare like-for-like including performance |
A warehouse or factory isn't a "box" — it's a machine that shapes operating efficiency. Pinning down zoning, structure, fire and operational flow first is what reconciles a long-usable facility with cost optimisation.
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