Ana Sayfa / Code Reference / Shelter Regulation
Turkish Shelter Regulation — Clause Reference
Exemption thresholds, occupant count and required shelter area, with clause numbers. Tables are read live from the calculation engine.
Many sources online still show 12. This page and the calculation tool use the current value; a test case separately checks that 12 units comes out as mandatory, so a return to the superseded threshold is prevented.
1. Shelter types — Clauses 5-6
Blast shelters protect against the immediate and residual effects of nuclear weapons, conventional weapons and chemical and biological agents. They are built by the State and are not the building owner's obligation.
Fallout shelters protect against radioactive fallout. In private and public buildings they are located preferably in the lowest basement storey. The calculations on this page concern fallout shelters.
2. Exemption thresholds — Clause 7
A fallout shelter is not required in the cases below. The obligation arises the moment the threshold is exceeded.
| Building type | Exemption limit | Once exceeded |
|---|---|---|
| loading… | ||
3. Occupant count — Clause 8
The occupant count is found in four different ways depending on building type:
| Building type | Occupant count |
|---|---|
| Dwellings | 2 persons for a one-room unit · 3 for two rooms · 4 for three or more rooms |
| Accommodation | the bed count in the approved project, increased by 20% |
| Other buildings and facilities | gross floor area ÷ 20 |
| Stadium / indoor sports facility | at least 3% of spectator capacity |
4. Area and construction requirements
| Requirement | Value |
|---|---|
| loading… | |
Shelters built entirely below ground are excluded from site coverage and floor area ratio (2025 provision).
5. Why the thresholds are cliffs
The shelter obligation does not grow proportionally. One step below the threshold the required area is zero; one step above it jumps straight to a substantial value.
| Building type | Below threshold | At threshold | Jump |
|---|---|---|---|
| loading… | |||
The shelter threshold simulation shows this jump as a curve; you can change the building type and size and compare both sides of the threshold live.