1. Climate and site
Orientation, wind, sun, rain, topography and risks condition design choices.
2. Energy
Reducing demand comes before sizing generation equipment.
3. Water
Consumption, storage, drainage, rainwater and sanitation should form a coherent system.
4. Materials
Durability, origin, production energy, repairability and reuse complement purchase price.
5. Comfort and health
Ventilation, light, heat, humidity and noise influence actual building use.
6. Maintenance
Performance must remain achievable with available skills, parts and operating budgets.