Brief definition
Gross floor area (BGF) under WoFlV is the floor area of all room and functional areas including the walls and internal components that bound those areas — measured at finished floor level of each storey.
Distinction
| Metric | Brief |
|---|---|
| BGF | Gross, incl. bounding components |
| NRF | Usable floor area, excluding certain ancillary areas |
| Living area | Specific calculation per WoFlV parts |
AIGO relevance
AIGO determines room areas and perimeters deterministically from floor plans. Norm-compliant derivation of BGF/NRF/living area requires regulatory logic (WoFlV). AIGO provides the verifiable geometry basis and supports standards queries with source citations.