# Space (Area Requirements) — Notes

## Provenance

- Source: **CORENET X Code of Practice v3.1**, Section 4 (BIM Data Representation — IFC+SG), pages 111–127.
- Source link: [CORENET X — IFC-SG Glossary of Identified Components ↗](https://info.corenet.gov.sg/ifc-sg/bim-data-(ifc-sg)/glossary-of-identified-components?id=90e8de0a-0a5d-4152-bac1-587eb8b593cc)
- Discipline: **ARC**  ·  Authorities: **URA**
- 5 IFC binding(s), 23 parameter(s).

## IFC binding breakdown

- `IfcSpace` — subtypes: AREA_GFA — 8 param(s), table format `ura`.
- `IfcSpace` — subtypes: AREA_GFA — 4 param(s), table format `ura`.
- `IfcSpace` — subtypes: AREA_GFA — 7 param(s), table format `ura`.
- `IfcSpace` — subtypes: AREA_GFA — 3 param(s), table format `ura`.
- `IfcSpace` — subtypes: AREA_GFA — 1 param(s), table format `ura`.

## Property prefix groups (IFC-SG Glossary)

Source: "Space (Area Requirements) property prefix" section on the CORENET X glossary
page under the parent **Space** component (`id=d0d2f5c7-f7dc-4c76-89dd-610e553e42c9`),
retrieved 2026-07-10. The 23 parameters split into 5 prefix families:

| Prefix | Purpose | Params |
| --- | --- | --- |
| **AVF** | Verifying GFA to be included/excluded | 1 |
| **AGF** | GFA information (development intensity, planning controls, GFA exemption/bonus) | 8 |
| **AST** | Strata information (ownership) | 4 |
| **ALS** | Landscape information (LRA / LUSH assessment) | 3 |
| **ACN** | Connectivity information (pedestrian/cyclist access, POPS) | 7 |

### ⚑ Mandatory inputs (explicitly stated on the glossary page)

- **`AVF_IncludeAsGFA`** — *"must be checked for all areas that are proposed to be
  included as GFA"*. Only property with the AVF prefix.
- **`AGF_DevelopmentUse`** — *"must be keyed in for all areas in relation to GFA
  evaluation"*.

### ◆ Key (not phrased as "must")

- **`AST_AreaType`** — the glossary calls this *"a key property"* for the strata layer:
  it decides whether a space is private strata, strata (communal) or common area.

### Membership by prefix

- **AVF (1):** AVF_IncludeAsGFA ⚑
- **AGF (8):** AGF_DevelopmentUse ⚑, AGF_Name, AGF_UnitNumber, AGF_BonusGFAType,
  AGF_Note (required if AGF_Name = "Others"), AGF_UseQuantum, AGF_BuildingTypology,
  AGF_SupportingFacility
- **AST (4):** AST_AreaType ◆, AST_LegalArea, AST_Prop_StrataLotNumber,
  AST_Extg_StrataLotNumber
- **ALS (3):** ALS_LandscapeType, ALS_GreeneryFeatures, ALS_Species
- **ACN (7):** ACN_ConnectivityType, ACN_ActivityGeneratingUseType,
  ACN_IsPavingSpecified, ACN_PavingSpecification, ACN_IsOpen24HoursToPublic,
  ACN_OpenTime, ACN_CloseTime

> Note: this prefix section is newer than the CoP v3.1 extraction and the 2026-06-13
> glossary scrape — it exists only on the live glossary page.