1. Types of multi-unit housing
From timber/light-steel apartments to RC condominiums. Rentals (income property) and for-sale differ in focus: rentals on cost efficiency, rent and vacancy, for-sale on product appeal and asset value.
2. Structure — RC wins on fire and acoustics
Urban multi-unit is mostly RC: superior fire resistance, acoustics and durability, suppressing noise between units — so rental value is higher. Cost guide ¥1.2–1.9M/tsubo, lower for rentals with restrained spec (RC cost structure).
3. Shared-housing regulations
Housing many occupants, multi-unit faces stricter rules than houses: per-unit daylight and ventilation, two-way escape, party-wall acoustics and fire, and fire equipment, set by use and size. See fire safety.
4. The yield/investment view
Rental viability turns on gross and net yield, vacancy rate and repair reserves. Beyond build cost, the plan must include local rents and long-term upkeep (investment perspective).
5. Cost guideline
| Structure | Per tsubo (shell) | Character |
|---|---|---|
| Timber apartment | ¥0.7–1.2M | low cost; acoustics need care |
| RC condominium | ¥1.2–1.9M | strong fire/acoustics/durability |
Common pitfalls
| Risk | Prevention |
|---|---|
| Underrated acoustics → noise complaints, move-outs | Design party-wall/floor acoustics from the start |
| Aggressive occupancy assumption breaks the numbers | Judge on net yield including vacancy and repairs |
| Missed shared-housing egress/fire rules | Confirm compliance early from use and size |
| Judging on build cost alone, ignoring upkeep | Plan including repair reserves and renewal cost |
Multi-unit isn't "build and done" — it's an asset that earns rent over time. Designing structure, rules and economics together, with vacancy and repairs allowed for, is what keeps it valuable for the long term.
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