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Modular design is the second desirable feature of sound, lifetime design. Modular means that the object can be modified. This is particularly desirable, as needs change over a lifetime. The Center for Maximum Potential Building Systems in Texas has designed Green Forms – a modular building system based on xyz-corner bolted post and beam construction. A sample building beam with predrilled holes is shown. There are functional indoor modules, such as a bathroom or entertainment module, that can be fitted into the rooms.

It is important to note that lifecycle costs of products, such as buildings, occur mostly not in the original purchase price, but all the modifications that are made over the lifetime, as shown in the illegible graph in the middle. The up-front cost is about one third of the lifecycle cost. To keep the lifecycle costs down, modular design is desirable.