SUSTAINABLE CONSTRUCTION Design of the buildings incorporating architectural and constructive criteria, with the aim of achieving maximum comfort inside for free, minimizing the contributions of conventional energy. 1. Shape and design criteria 1a. Compact design of the building to minimize heat losses 1b. Insulation around all the building skin 1c. Favorable position respect the prevailing winds 1d. Recyclable, reusable, ecological and biodegradable materials 1e. Industrialized construction to reduce waste in the construction process 2. Efficient management of energy 2a. High airtight and reduction of thermal bridges 2b. Preheating and pre-cooling of air through geothermal 2c. Flexible solar protection depending on the incidence of the sun 2d Use of solar energy 2e. Natural cross ventilation 3. Efficient water management 3a. Rainwater harvesting systems 3b.