Every single end source of the plumbing should comply with Part G, so this means that baths, tap flow, shower flow, toilet flush and many kitchen appliances are included. It is also worth noting that grey water and rain water harvesting are factored into the calculation, should facilities for this have been installed in the new development. There is a calculation to work out the compliance of each of these areas, but the basic requirement is that, when combined, the new build should not use more than 125 litres of water per day, per person in the building.
It is important to note that this 125 litres is per person and not per appliance or bath, for example. This means that it does not matter whether there are 20 baths or 1 bath in the building – the number will stay the same. After all, one person can only use one bath at the same time! There is not a huge reason to worry though, as if fittings are used that have standard flow rates, the chances are a building will easily comply with Part G and therefore developers don’t need to be overly concerned.
It is worth noting that there are a few things that are exempt from Part G, for the obvious reasons that, by their nature, they use much more water than would otherwise be allowed. These three things are indoor swimming pools, saunas and Jacuzzis. So, if you are building these into a new development, there is absolutely no need to factor them into your calculations. If you have any queries though, a professional SAP assessment company will be able to advise on the impact of each fitting in a new home or development.