Brief definition
Under VOB (especially VOB/C), quantities in the bill of quantities (BoQ) underpin pricing and settlement. They must be determined per the reference rules of the service description and documented in a traceable manner.
Requirements for QA and planning
- Unambiguous reference dimensions (m, m², m³, pcs)
- Demonstrable derivation from design documents
- No “estimated” quantities without a documented source under review
Normraum relevance
VOB requires quantities with a demonstrable derivation. Normraum calculates areas from the as-built plan deterministically – same input, same result – and links every item to its source reference in the plan; the check log documents confidence score and norm reference. Settlement and the VOB/C reference rules remain professional application. Old plans do not replace a survey; Normraum flags where one is needed.