Main principles

   1. Project is a system of geometric, quantitative and qualitative rooms features.
   2. Room is a three-dimensional segment, bounded from the rest space by three surfaces:
   - walls;
   - floor;
   - ceiling.
   3. Each surface has to be finished.
   4. Finish of each surface consists of some layers.
   5. Each layer is made of some material and there are man expenses on creating it.

Terms description

   Project
   Each separate closed room has its own number unique on the project.

   Rooms
   1. All geometric characteristics has its measurement unit:
   - linear, coordinates - meter or foot-inch;
   - areas - square meter or square foot;
   - volumes - cubic meter or cubic foot.
   2. All figures connected with money are calculated in conventional units.
No other measurement units are used in the program.

   Surface finishing
   While entering the room finishing parameters have to be specified for each of three room surfaces.

   Finishing layers
   In general any of three surfaces for all layers can be classified as:
   - final finishing layers, they are for esthetic perception of interior (architect-constructor is most interested in);
   - leveling layers, to make vertical surfaces strictly vertical and strictly horizontal due to visual perception or make them with regular slope or curvature;
   - additional layers perform functions of bordered surface: thermal and water proofing, acoustic insulation, etc.

   Expanses calculation for each layer
   While creating layer two prices are to be defined: 1 m² (or 1 sq. ft.) of layer materials and 1 m² (or 1 sq. ft.) of works.
   It will not be easy if you, for example, include the cost of zinc-covered drywall accessories or cost of mixture affix tiles, but finishing professionals are skilled in this area. They are able to calculate the price of 1 m² (or 1 sq. ft.) for each of non-system units of items applied for finishing (plasterboard, pail of lute, sack of mixture, etc.) through normalized expanses of material per 1 m² (or per 1 sq. ft.) of finishing area. If you expand certain time to perform such calculations you would be able to introduce it to your customer and find out special parameters and characteristics:
   - floor price of 1 m²/sq.ft. (of all layers including works on creating each of layer);
   - wall price of 1 m²/sq.ft. (including leveling, preparing surface, etc. to final finishing with cost of work);
   - ceiling price of 1 m²/sq.ft. (price of all materials and works) for all rooms.
   So, there is the most effective method to calculate precise and total price of finishing materials and works. It will be like a draft of future expenses that is more convincing and evident for your customer in comparison with other methods because expanses become obvious. While calculating the unaccounted by project, unanticipated expanses will be more explained. One of the goals is to reduce efforts and time to "draw such scheme".

Details related to finishing

   Rooms openings
   Frequently, there are various walls openings in the room, such as doors and windows. They can be divided into internal and external:
   - external connects room area with infinite space;
   - internal connects different rooms, one internal opening binds two rooms.
   Openings are also can be finished and information about finishing materials price, the price of opening setup should be calculated.

   Additional elements
   If consider only three surfaces and openings not all 100% of finishing materials will be calculated. For example there are elements that are not a part of room perimeter (e.g. column) or elements less than room height ("apron" from Dutch tile, partition less than room height) or some another elements. To include the expanses of material on such elements there is a special term named "Additional elements".
   For each additional element it is necessary to specify its measurement unit type: quantitative, linear, square or cubic.

   Correction factors
   Side of not finished surface of supporting or filler constructions can be with lugs (e.g. beam) or technological bays, which have to be hidden in the thickness of finish. The side of final finishing surface also can be with lugs or bays (decorative or functional). To calculate all of this surface peculiarities you should use correction factors.