Brief definition
Cost group 300 (KG 300) under DIN 276 comprises the building structures of a project — from foundations and structural frame to non-load-bearing interior and exterior components, insofar as assigned to KG 300.
Relevance for quantity take-off and BoQ
In early design and tendering, quantities from drawings (areas, lengths, counts) are assigned to this cost group. A traceable geometry source (PDF → calibrated take-off) is a prerequisite for verifiable bills of quantities.
Normraum relevance
For KG 300, Normraum supplies the geometry source from the as-built plan: rooms with area under DIN 277, plus the detected walls, doors and windows – every item with its source reference in the plan and a confidence score. Assignment to the cost group and the level of tender detail stay with the planner. Uncertain detections are flagged in the check log; Normraum does not replace a survey of the existing building.