Modelbased quantity takeoff and Cost Calculation (Building Design and Construction)
Management Summary
The objective of this working group is to create IDM (Information Delivery Manual) and MVD (Model View Definition) for LoDK 100500 for model delivery from authoring systems into programs for cost/quantity calculation/calculation (Architectural Model→ Cost, Architectural Model→ Contractor).
Use Case Description
For modelbased quantity takeoff and cost determination, building models must contain a minimum amount of information. The authoring systems should output models according to the MVD LoDK 300, for example. On the other hand, a program can use the MVD to check whether all required properties are included. The IFC4 schema (IFC4 Add2 TC1) serves as the basis for data and information exchange and attribution.
This use case is currently being developed by the buildingSMARTWorking Group Construction2 "Digital Collaboration and Data Exchange in Construction" together with Working Group "QTo & Cost Calculation".
Purpose and scope
 Quantities can be comprehensibly derived from the model
 The traceability of quantity approaches to the corresponding model is possible
 Changes to the quantity structure can be easily documented
 Updates can be incorporated more quickly and are less errorprone
 The interpretation of the model quantities becomes much more precise for the evaluating systems
 The exchange data contains costrelevant descriptive characteristics
 Improved traceability of the quantities for service descriptions (which component quantities are contained in a service item)
Life Cycle Stages
HOAI
BIM objectives / benefits
 The quantities for the cost calculations and service descriptions can be derived directly from the model.
 All model elements contain the information required according to the respective level of detail.
 Faster determination of quantities through direct derivation from the BIM model
 Less effort for subsequent or even renewed modeling for quotation costing at construction companies
 Quantity evaluations
 Cost calculations, e.g. according to DIN 276 or standard service areas
Delimitation
 Modelbased quantity and cost calculation (LoDK 300) Construction of Buildings
 Cost calculation
 Preparation of the tender
 Architect: Basis for preliminary quotation requests
 Construction company: Quantities for quotation costing
 It's NOT a Modelbased Billing
Prerequisite / framework conditions
The detailing of the model required in each case is based on the level of development for the cost calculation according to VDI 2552 Sheet 3.
LoDK 100  
Figure 1 Model LoDK 100 (source: Allplan) 
Quote VDI 2552 Example of a quantity that can be determined from a cost element with LoDK 100: planned usable area from room schedule in m2. 
LoDK 200  
Figure 2 Model LoDK 200 (Source: Graphisoft) 
Quote VDI 2552 Example of a quantity that can be determined from a cost element with LoDK 200: planned area of building plot (FBG in m2), planned gross floor area (BGF in m2), planned gross volume (in m3). 
LoDK 300  
Figure 3 LoDK 300 model (source: Graphisoft) Figure 4 LoDK 300 model (source: Graphisoft) 
The model consists of simple rough elements, such as walls, ceilings incl. floor structures, rooms, roofs. Quote VDI 2552 Example of a quantity that can be determined from a cost element with LoDK 300: planned exterior wall area of building in m2, planned cleaning area of building facade in m2.

LoDK 400 and LoDK 500  
Figure 5 Model LoDK 400/500 (Source: Graphisoft)
Figure 6 Model LoDK 400/500 (Source: Graphisoft) 
The 400 LoDK model contains multilayer superstructures with detailing from a building permit application / approval planning. The 500 LoDK model matches the modeling approaches to the model in LoDK 400, but contains detailed construction and more information. LoDK 400 Model elements that allow the determination of quantities of individual construction elements with classification according to 3rd level DIN 276 or comparable as well as an allocation of services according to STLB Bau or comparable. The information status of the model elements corresponds at least to the execution planning. Example of a quantity that can be determined from a cost element with LoDK 400: planned area of a wall panel in m2,2planned cleaning area of a window in m LoDK 500 Example of a quantity that can be determined from a cost element with LoDK 500: created volume of a floor slab in m3, cleaned floor area in m2 
Distinctive feature of model delivery from planner to contractor: For a calculation on the contractor's side, remodeling is required for some components, depending on their manufacture. The construction of a wall with an opening serves as an example here. Depending on the requirements, this could be constructed differently and thus calculated differently (e.g. precast element with opening, castinplace concrete with recess, construction from beams and columns, etc.).
Abbreviations
LoDK (Level of Development for Cost Calculations)
Units of measure
For the processing of quantities the following units are:
cm² 
Square centimeter 
mh 
Meter x hour 
d 
Day 
md 
Meters x days 
dam³ 
Cubic decameter (1000m³) 
mWo 
Meters x weeks 
h 
Hour 
mMt 
Meters x months 
a 
Year 
m²d 
Square meter x days 
kg 
Kilogram 
m²Wo 
Square meters x weeks 
km 
Kilometer 
m²Mt 
Square meters x months 
km² 
Square kilometer 
m³d 
Cubic meters x days 
l 
Liter 
m³Wo 
Cubic meters x weeks 
cm 
Centimeter 
m³Mt 
Cubic meters x months 
m 
Meter 
m³km 
Cubic meters x kilometers 
m² 
Square meter 
Sth 
Piece x hours 
m³ 
Cubic meters 
Std 
Piece x days 
Mt 
Month 
StWo 
Piece x weeks 
psch 
flat rate / lump sum 
StMt 
Piece x months 
St 
Piece 
St/M 
Piece per month 
t 
Ton 
St/J 
Piece per year 
Wo 
Week 
tMt 
Tons x months

Project Group
 Haffa, Andreas (SOFTTECH AG)
 Kreienbrink, Holger (Graphisoft Deutschland GmbH)
 buildingSMARTWorking Group Construction2 "Digital collaboration and data exchange in construction" and Working Group "QTo & Cost Calculation":
 The List of Group Members will follow soon.
 IFC4 support by Mirbek Bekboliev (buildingSMART Germany) and MVD expertise by Klaus Linhard (iabi).
Copyright
buildingSMART Deutschland e. V.
All dokuments are licensed as a Creative Commons AttributionNonCommercialShareAlike 4.0 International License
(AttributionNonCommercialShareAlike 4.0). Further information can be found at
Handling
The documents reflect the current best practice and do not claim to be complete. They should not to be understood in the sense of a generally valid recommendation or guideline from a legal point of view. The documents are intended to support appointing and appointed parties in the application of the BIM method. The documents must be adapted to the specific project requirements in each case. The examples listed do not claim to be complete. Its information is based on findings from practical experience and is accordingly to be understood as best practice and not universally applicable. Since we are in a phase in which definitions are only emerging, the publisher cannot guarantee the correctness of individual contents.
 Document Type : Use Case
 GUID : A25D875690B4432297ADDCE04AC695BF
 Identifier : 
 Life Cycle Stage : HOAI
 Revision : 
 Project Status : WIP
 Maturity level : Outlook
 Published on: Aug 12, 2022
 Last change: Aug 12, 2022
 Publisher: buildingSMART Germany
 Author:
Not registered yet?
Register for the Use Case Management Service for free to access the entire document.
Registered users can use the download area and the comment functions.