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It is very important to separate the shell costs from the finishes costs when working with appropriate construction technologies.

The system separates each particular item giving a sub-total within each sheet and general totals at the end of the system.

1 Shell
This section comprises the principal parts of the construction: foundations, structure, floors, roofs and walls. The most important economies can be achieved on these construction components, specially when local materials are used.

2 Finishes
In this section all the final finishes only contribute to a minimal cost-saving using appropriate technologies. Nevertheless separate analysis of these items an evaluation determining maximum cost-saving possibilities.