The Building Services Portal Water Efficiency Calculator
The Building Services Portal water efficiency calculator is a spreadsheet template used for demonstrating compliance to the Building Regulations Part G requirements for new dwellings. The spreadsheet is extremely simple to use with accompanying instruction to guide you through the process. Get started straight away and try the free embedded spreadsheet below (desktop and tablet only).

Please be patient as the spreadsheet loads..
Tips…
The cells that require you to enter values are highlighted in yellow. The sheet automatically calculates the relevant totals. Embedded above is table A1, there are further tables required for more complex systems, these are included in the premium excel version. Further instructions and useful tips are contained within the premium version.
Water Efficiency Calcualtor options
Premium
£ 49 (incl. VAT)

All features of the basic version plus…
- Features your company logo and watermark removed for professional presentation of your calculations, ideal for Building Regulation Part G compliance submission.
- Sent to you in Excel format.
- Clear easy to follow instructions included.
- Building Services Portal general guidance tips included.
- Personalised spreadsheets sent out same day.
- Customer support- Our team of Chartered Engineers respond to all product related questions within 1 working day
Design Pack
£ 199 (incl. VAT)

Premium Design Pack Includes…
- The Premium Building Services Portal Water Efficiency Calculator
- The Premium Building Services Portal Pump sizer spreadsheet
- The Premium Building Services Portal Fan sizer spreadsheet
- Personalised spreadsheets sent out same day
- 90-Day money back guarantee
Further water efficiency calculator details...
Free Embedded Version
Easy to Use
The Building Services Portal Water Efficiency Calculator is the easy way to carry out the required Building Regulation Part G Water Efficiency Calculations for new build residential properties.
Simply enter the relevant product data for the properties sanitaryware and appliances then calculator will do the rest. The total water consumption per person/ per day, is calculated using the Building Regulation Part G methods, from entering the below information;
- WC flushing volumes
- Tap flow rates
- Bath capacities
- Shower flow rates
- Sink tap flow rates
- Washing machine/ dishwasher/ waste disposal units and water softener information
There is no need for carrying out complex calculations, all required values are calculated automatically!


Premium version
Present your calculations professionally
The Premium version is ideal for professionally presenting your calculations. The Premium version includes your company logo which makes it ideal for presenting calculations to clients and for Building Control submission. Your logo will be in place of the Building Services Portal logo. Personalised spreadsheets sent out same day.
The premium version includes detailed instruction and the Building Services Portal helpful guidance.
Various tables for calculating situations with multiple types of each sanitaryware items are included. The calculator also includes all calculations required for rainwater and greywater harvesting systems. Simply click on the relevant tab at the bottom of the page to display the different sheets which all contain helpful guidance.
The Premium version comes with the added benefit of customer support. Our team of Chartered Engineers will respond to any questions related to the water efficiency calculator within 1 working day.
We are confident you will be happy with your purchase but offer a no quibble 90-day money back guarantee.
Building Services Portal- Premium Design Pack
The Premium Design Pack includes the following;
- The Building Services Portal Water Efficiency Calculator
- The Building Services Portal Premium Pump Sizer
- The Building Services Portal Premium Fan Sizer
- Personalised spreadsheets sent out same day
- Customer Support
- 90-Day Money Back Guarantee
Premium Design Pack- £199 (incl. VAT)