Brief definition
- DIN 277 governs areas of buildings (gross/net floor areas, usable areas by use type).
- DIN 276 structures costs into cost groups for fees and cost planning.
Both standards are used in parallel in early design — they answer different questions.
Practice for planners and estimators
| Question | Standard |
|---|---|
| What is the building area? | DIN 277 |
| Which cost group does a component belong to? | DIN 276 |
| WoFlV living / usable area? | WoFlV (supplementary) |
Normraum relevance
Normraum answers the first question in the table: area per room under DIN 277 – or WoFlV – from the as-built plan, calculated deterministically, with confidence score and source reference in the check log. For the second question, which DIN 276 cost group a component belongs to, the room book supplies the area basis and the detected walls, doors and windows; the assignment stays with the planner.