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Water
Calculations from
£49.95 + VAT

Water Usage Calculations

tick Over 17 years experience providing property surveys for all building types.
tick Specialising in Water Calcs, Overheating Calcs and other services for your property.
tick Contact us for free quotes and impartial advice.
Certified by the following organisations EPC Certification Quidos Certification

We provide Water Usage Calculations for every type of building!

Water usage calculations, also known as water efficiency calculations, have been part of building regulations since April 2010; Approved Document G and similar enforcements are part of the government's action plan to ensure the UK is prepared for the future and whatever changes it may bring.

Predictions such as the forecasted increase in average UK summer time temperature and a decrease in rainfall, estimated to be potentially as dramatic as a 3.5°C-5°C increase by 2050, are partially the reason for building regulations including limitations on the usage of water, per person per day, for all newbuilds and conversions built post April 6th 2010.

The regulations state that properties must cap water usage at a maximum of 125L per person per day. Local planning authorities also have permission to reduce this target to 105-110L per person per day. This practice is more common in London and southern areas. Failure to comply with the water usage limits will lead to a failing SAP compliance report, and prevent the development being signed off by Building Control.

It is good practice to have water usage calculations completed prior to commencing work on the construction of your property, as you can determine whether your property will be compliant before spending any money on installing appliances and fittings. This means that if you are not compliant you need only change the plans, not the physical building. Here at Easy EPC we offer a full range of new build and conversion services, so that we can help you stay compliant from the design stage all the way through to completion.

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1 Get your
Free quote

Simply request your quote using our contact form or by phone. Our customer care team will quickly get in touch during opening hours.

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2 Survey
then Payment

We will arrange an appointment with you, carry out the survey, and once completed send you an invoice.

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3 Get Your Water Usage Calculations Instantly

As soon as we receive payment of the invoice, we will email your Water Usage Calculations. We also offer corporate accounts, with survey delivery on completion and monthly billing.

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What do I get with Water Use Calcultions?

What do I get?

Following receipt of all requested information, it will take between 1-5 working days to produce your water usage calculations. Once complete you will receive a clear and easy to understand report, complete with the appropriate tables and the property address, ready to present to your SAP assessor and/or your Building Control officer.

If your property does not conform to the building regulation specifications, then we can advise you on potential adjustments to improve the outcome of the calculations. This is especially helpful advice if you have your water usage calculated prior to construction, as you can make these changes on the plans before spending money and time on potentially unsuitable products.

Properties exempt from needing Water Use Calcultions

Are any properties exempt from water usage calculations?

All new builds and most conversions are required to reach the standards set out in the Building Regulations UK Approved document G, however if your property was built before April 6th 2010 then you do not need to comply. The following scenarios would also mean that your property is currently exempt:

  • Work to build/convert the property physically commenced before 6 April 2010
  • Full plans were approved and conditions cleared by a local authority before 6th April 2010 and the work commenced before April 6th 2011
  • Where full plans were not required, a contract was entered pre April 6th 2010 or work was commenced 1st October 2011
What do Water Use Calcultions involve?
Water Use Calcultion process

What does the survey involve?

Easy EPC has a competent team of assessors who are all highly skilled and have the attention to detail required to complete your water efficiency calculations and reports, ensuring you get the high quality and accurate reports you need for building control.

The water usage calculations are a desk based exercise, so our assessors will be in contact via email and occasionally telephone if they have any queries or need more information.

Factors including washing machine and dishwasher usage, flow rates of taps and showers, and WC flush rates are all taken into consideration during the survey, to ensure you receive a comprehensive report to fully satisfy building control.

Water efficiency calculations are a service that is done at the desk; no site visit required meaning that you do not need to take time out of work/your normal day for an appointment. The calculations are based on the manufacturing info and flow rates from all of the various appliances in the property (ie dishwashers, showers, etc).

What else may I need alongside Water Use Calcultions?

What else may I need

Building control will also request SAP calcs/EPC for your new build or conversion, we offer both “as designed" and “as built" SAP services, meaning that we can help at all stages of your build or conversion!

If your dwelling is a new build rather than a conversion, or if you are converting 10 or more units as part of the same development, then you will probably also need an Air Permeability Test.

Part E of the building regulations require that your new build or conversion property conforms to its Sound Insulation Testing limitations.

In accordance with Approved Document O, your property will also require a Simplified Overheating Assessment, and potentially TM59 Overheating Calculations.

How do I book Water Use Calcultions?
Water Use Calcultions booking process

How do I book?

To get a quote for a Water Usage Calculations for your property simply give us a call on 0800 170 1201, or alternatively fill in our contact form

The basic information we need to be able to provide you with a price for the survey is:

  • Architectural drawings including the plan view, cross sections, and elevations
  • Number of properties to be calculated

Our prices for water usage calculations generally range between £49.95 + VAT - £74.95 + VAT for a single property up to four bedrooms, although if you have a large number of properties (ie a block of flats) to be tested in the same booking, we may be able to offer you a discount! Contact us today to see if you are eligible for a multi property discount.

Once we have provided you with a quote, if you wish to go ahead and book we will also need invoicing details and contact details for whoever will be meeting us on site. We don't charge up-front, but will invoice you for the work on completion, and release the water use calculations to you upon receipt of payment. Our pricing includes use of equipment and travel, so the price we quote you is the total price you will pay.

After you have booked with us one of our new build assessors will contact you with a document clearly detailing all of the information they require for the survey.

Upon receipt of all of the necessary information it takes us between 1-5 working days to produce the report, at which point we will contact you to let you know it's ready and provide you with an invoice. On payment of the invoice we will email your water usage calculations.

Use our online booking tool to quickly get a quote for your Water Usage Calculations.

Our prices start from £49.95 + VAT, depending on size and location of the property.

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Your Questions, Our Answers

Dive into Our FAQ Section for Help and Guidance

Water calculations calculate the amount of water likely to be used in a home, based on estimated usage and manufacturing information of flow and flush rates. Water calculations are part of UK Building Regulations (Approved Document G) and have been required by Building Control since 2010.

Water Usage Calculations are a desk based exercise, and as such, no on-site survey is required.

We will need information such as the manufacturer and models of fittings such as baths, showers, dishwashers, etc., including:

  • Basic taps (not kitchen or utility)
  • Baths
  • Showers
  • Dishwasher
  • Washing Machine
  • WC's (single flush/dual flush)
  • Kitchen/utility sink taps
  • Water softener
  • Is a waste disposal unit installed
  • Is there any rainwater or greywater recycling installed for internal use? (WC's and/or washing machine)

Any domestic property built since April 6th 2010 are required to comply with water usage legislation.

For the majority of domestic properties, it’s 125L per person per day, however local planning authorities have the permission to reduce the cap to 120L per person per day.

Want to chat to a human?
Call us on 0800 170 1201
Lines Open (Monday - Friday) 9:00AM - 5:30PM

Our prices start from £49.95 + VAT, depending on size and location of the property.

award 17+ Years Industry Experience
message Dedicated customer & tech support
home Easy 3 step booking process

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