Part G Water Calculations

We provide Part G Water Calculations to show that the water usage of a new dwelling meets the requirements of Part G. Currently the Building Regulations require a maximum water consumption of 125 litres/person/day (125 litres per per person per day) in order to comply.

125 l/p/d is fairly easy to achieve with modern sanitaryware but can become tricky where large baths or powerful showers are being used – In these cases it is necessary to offset high usage in one area with low usage in another, or use alternative water sources to offset high usage (e.g. rainwater or greywater harvesting).