To start your calculation please select which criteria from the list below you want your project to meet:

Performance target   Maximum consumption of potable water (litres / person / day)
17.K Compliance (Building Regulations Part G)    
Code for Sustainable Homes (Level 1/2)    
Code for Sustainable Homes (Level 3/4)    
Code for Sustainable Homes (Level 5/6)    
Your own defined level    
 
Choose a name for this project  
 

The performance target and project name can be changed later. Cookies and JavaScript must be enabled in your browser. Your browser will store your most recent calculation for two weeks. Once you've finished, you can print your results and/or save them to our database.