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Group of authors
Statybų Ekonominiai Skaičiavimai
(Economical Calculations for Construction)

Rimvydas Mikalauskas
Butrimonių st. 5-209, LT50203 Kaunas
Phone/Fax. (+370 37) 313 420

Saulius Mikalauskas
Butrimonių st. 5-209, LT50203 Kaunas
Phone/Fax. (+370 5) 270 16 44
Cellular (+370 686) 201 96

RU - LT - EN


SAS – Automated construction estimating system, based on building information modelling concept, interconnects structural design, estimating and time shedulling. This is a result of co-operation of „IN RE“ Ltd., „Constructus“ Ltd. and SES, started in 2002 year.


The main purpose of SAS is to automate the economic part of design at the maximum, providing user (designer, contractor or investor) with effective tools to evaluate economic expenditures at any stage of a project - from the design stage to finished construction. Just-one-click tools enable user to get an estimate (expenditures of resources, supposed operations, cost calculations) with no need to calculate quantities, select work normative, evaluate conditions: everything is obtained automatically from information model of a construction. An estimate is obtained in a file format of SES2004, and can be edited using the widest functionality of this application and largest databases of wok norms and construction resources (materials, labour, and machinery). As there are references between structural elements (in the model) and estimate, one can acquire any cost-related and expenditure-related information for each such element. Changes in a design can automatically regenerate associated estimate. All information about operations and resources from estimate can be passed to time scheduling applications, such as Microsoft Project. All information is stored in a general database, so feedback is widely possible.


According to carried calculations, this system can save up to 40 percents of the time, required for design and economic-technologic calculations, including preparation of drawings, estimates, and schedules analysing a number of alternative versions of a project.


  • All means of modelling and design tools using MicroStation TriForma;
  • All duilding elements are actually intelligent, and have not only quantitative information (for example, volume, height, quantity), but qualitative too (colour, type, composition), as BIM concept prescribes;
  • SAS module in MicroStation TriForma provides special tools for description of building elements, their assembly or production (for example, „Brick wall, “Loadbearing wall“) and a set of qualitative properties (for example, brick type, means of delivery, additional reinforcement, joints, etc.);
  • Qualitative properties may be set for each element separately or for entire group. Any element can hold more than one description (for example, brick wall itself, it’s daubing, painting, etc.);
  • Geometry parameters (volume, area, height, etc.) are acquired automatically and can de passed to estimate;
  • After any change of constructional element in a model, estimate can be regenerated (for example, for the purpose of alternative solutions).

Parameterisation of Building elements:

  • SAS Database of typical building elements (DTBE) is aimed to typical up-today solutions and technologies in construction;
  • The basis of DTBE database is Classificatory of typical building elements (CTBE),  which arranges typical elements into classes, groups and subgroups according to technological processes;
  • Each description of typical element contains code, name, set of parameters, fragment of estimate and a macro which process fragment depending on parameters (for example, chooses appropriate norms, calculates quantitative information, etc.);
  • On purpose to ease the setting of parameters most of values can be picked from a list, along with numerical parameters, DTBE provides proper versatility;
  • Fragments of estimates for typical elements are based on norms, certified by governmental institutions of Lithuania and Russian Federation;
  • DTBE database can be easily updated by new elements, adapted to any company or/and technology.


  • Estimate, crated automatically by SAS, can be processed further, using SES2004 functionality – one can insert additional norms and resources, valuate costs of resources, etc.;
  • Parameters of constructional elements can be edited directly in estimate, and saved in general database of model. Thus estimator can directly interfere the process of design, setting the parameters according to his competence;
  • All versions of model and enclosed estimates can be later analysed for differences between stages of project – from sketch to finished building;
  • SES2004 provides the possibility to pass all required information (works, operations, expenditures of materials) to scheduling applications, such as Microsoft Project;
  • The information from the estimate, created automatically by SAS, is used to compile the whole set of bidding, execution and analysis documentation.

About the project:

This solution is designed for construction and design companies, real estate agencies and investors.


For now, SAS is application for Bentley MicroStation TriForma, SES2004 and Microsoft Project. Total cost of integrated package is about 17.000 Euros. Future plans include compatibility with other design applications.


Future SAS development plans:

  • Constantly extend the database of constructional elements (new technology);
  • Expanding the functionality of SAS software;
  • Development of Russian and English versions, distributing them abroad the Lithuania;
  • Further correlation of estimate and time schedule.


SAS is already introduced to several construction companies of Lithuania, most of potential users know it already from different seminars, exhibitions, science conferences and publications in magazines „Naujoji statyba“, „Statyba ir architektūra“ and other.


A lot of specialists participated in development of SAS, but there is left some uncovered areas, open problems. We invite all companies to partake in this project and share their experience.