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)
From 1 October 2015 Compliance England Building Regulations Part G    
From 1 October 2015 Compliance England Building Regulations Part G    
Up to 30 September 2015 Code for England & Wales Sustainable Homes Level 1/2    
Up to 30 September 2015 Code for England & Wales Sustainable Homes Level 3/4    
Up to 30 September 2015 Code for England & Wales 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.