Brief definition
Cost group 420 (KG 420) under DIN 276 comprises heat supply installations — generation, distribution, and transfer of heat in the building (e.g. heating, heat distribution).
Relevance for quantity take-off and BoQ
Quantities include pipe lengths, counts of radiators/sub-distributors, and areas in plant rooms. Design documents must clearly show pipe routes and component schedules.
Normraum relevance
Radiators, distributors and pipe routes for KG 420 are not detected by Normraum – symbols and pipework are not part of the component detection. From the as-built plan, Normraum supplies the rooms with use and area under DIN 277 plus doors and windows with source reference: the room structure on which sizing and component schedules build, with a confidence score in the check log.