As part of economising on the earth's resources and to be sustainable we exercise Frugality in Architecture:

Using sensitive and innovative design principles and building techniques, frugality in usage of energy and building materials is practised, causing the project to be cost effective.

Sustainable Architecture
Using, by choice, local and indigenous renewable building materials that are easily accessible as well as the fact that they can be reused. This extends to include the use of re-cycled building materials.