Water Efficiency Calculations
We provide Water Efficiency Calculations that enable developments to meet their Building Regulations requirements for sustainable water use. These calculations can also play a crucial role in the preparation of Energy Statements for Planning, ensuring that all water usage complies with the relevant planning policy targets.
An assessment calculates the predicted internal water consumption using approved methodologies to demonstrate compliance with Part G of the Building Regulations and, where necessary, stricter local planning policy targets. This includes evaluating fittings and fixtures such as taps, showers, toilets, and appliances, ensuring the design meets the essential litres per person per day benchmarks.
A practical, solution-focused approach is adopted to identify compliant, cost-effective specifications without compromising performance or usability.
What are Water Efficiency Calculations?
Water efficiency calculations, also known as water consumption assessments, are evaluations used to estimate the amount of water a dwelling will consume based on the specifications of fixtures and fittings such as taps, showers, toilets, and appliances.
This process includes calculating the expected daily water use per person and comparing it to the Building Regulations water targets, which can range from 125 litres per person per day down to 110 litres per person per day. These targets are established to promote more efficient water use and to minimise unnecessary waste.
How Can We Assist?
- Fully accredited and vastly experienced
- Nationwide Coverage
- Advice on the development of a specification for fixtures and fittings such as taps, showers, toilets, and appliances
- Support from planning through to Building Control sign-off
- Competitive pricing and fast turnaround times
Initial Assessment
Provide your drawings along with a specification of fixtures and fittings. If you are unsure about these details at the Design Stage, don’t worry; we can help you to develop a fully compliant specification that meets Building Regulations water consumption targets.
All water consuming fixtures and fittings within the property, such as taps, showers, baths, toilets, and appliances like dishwashers or washing machines, are assigned a consumption value based on their flow rates or capacity. These values are then combined using a standard calculation method as part of the Part G Water Efficiency Calculations to estimate the total daily water use per person, expressed in litres per person per day. This figure is then compared against the regulatory target, which is typically 125 litres per person per day, or lower if local planning policies apply.
Practical & Cost Effective Solutions
If the calculated water consumption assessments indicate that usage exceeds the target, adjustments will be made to the specification, such as opting for more efficient fixtures or restricting flow rates, to ensure compliance is achieved.
The final results will be documented in a short report, confirming that the development meets Part G requirements and encourages responsible water use.
Related services
Supporting compliance across the project
Related services include Overheating Risk Assessments, SAP Calculations and SBEM Calculations.
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