Knowledge: terms from as-built surveys, areas and CAFM
The terms that appear in bills of quantities and tenders – one page each, each with the definition first. Intended for reference before the meeting to discuss a quote.
All entries
01
DIN 277
The standard by which floor areas in building construction are classified: BGF, KGF, NRF, NUF, TF and VF.
02
DIN 277 vs. WoFlV
Two area concepts, two results for the same building. Which one applies in the lease and which in operation.
04
Georeferencing
Why a survey needs an official spatial reference: ETRS89 for position, DHHN2016 for height.
05
MF-GIF
The guideline by which commercial rental areas are calculated — where DIN 277 says nothing about who pays for what. Since 2023 it combines MF/G, MF/V and MF/W.
07
LOD 200, 250, 300
The levels of detail of an as-built model. Without an agreed level, the scope of delivery remains an open question.
08
Mobile mapping vs. terrestrial
When capture is done on foot and when from a tripod — and what that means for accuracy.
09
Level of information need (LOIN)
The information need comes from the purpose, not from the level of detail. The specification that makes quotes comparable.
10
IFC
The vendor-neutral model format according to ISO 16739. What it carries and what is lost on export.
11
DIN 276 and cost group 400
Cost group 400 classifies the technical installations. DIN 277 describes the areas, DIN 276 the building services.
12
CAFM Connect
The standard with which a data handover to the CAFM system can be tendered and accepted.
13
DIN 18202
The permissible deviations in building construction. Without a tolerance, a measured value is not a finding.
14
COBie
Room and equipment data as a set of spreadsheets. Required above all where tenders are international.
16
GEFMA 444
The certification of CAFM software. It shows which structures a receiving system demonstrably processes.
If a term is missing
This directory grows with the questions we are asked. If a term from your tender is missing, write to us – we will add it and answer it for you in advance.