Water Efficiency Calculations for New Dwellings
We provide Water Efficiency Calculations for architects, developers, housebuilders and contractors, helping project teams assess proposed sanitary fittings and appliances and provide the calculations and documentation required for Building Regulations compliance.
Whether you’re working on a single new home, apartment scheme, supported accommodation or larger residential development, we provide clear calculations and practical support throughout the design process.
A Water Efficiency Calculation assesses the estimated whole-house potable water consumption of a new dwelling using the methodology set out in Approved Document G.
The calculation considers the water consumption of fittings and appliances such as:
• WCs, taps, showers and baths
• Dishwashers and washing machines
• Water-consuming appliances and fittings
• Rainwater or greywater systems, where applicable
The calculation uses manufacturer product information to estimate water consumption and produces a figure in litres per person per day.
For new dwellings in England, the standard maximum calculated consumption is currently 125 litres per person per day. Where the optional requirement applies, the target is 110 litres per person per day.
Water efficiency is an important part of the design of new homes, helping reduce water consumption and demonstrate compliance with Building Regulations.
A Water Efficiency Calculation can help you:
• Demonstrate compliance with Building Regulations Part G
• Check proposed fittings meet the required water-efficiency target
• Identify potential issues before products are specified or installed
• Support planning requirements where higher water-efficiency standards apply
• Provide the documentation required for Building Control
Carrying out the calculation early gives the design team more opportunity to adjust fittings and appliances if the proposed specification does not meet the required target.
We work with architects, developers, contractors, housebuilders and construction professionals, providing design and build compliance services across residential and commercial projects.
From SAP Calculations and SBEM Assessments to air pressure testing, acoustic testing, ventilation and thermal performance assessments, we provide the technical compliance services your project needs at different stages of design and construction.
With one company and one point of contact, we make it easier to manage multiple compliance requirements from design through to completion, helping your project stay on track and meet applicable Building Regulations.
Water Efficiency Calculations for new dwellings in England are carried out in accordance with Building Regulations 2010, Regulation 36 and Approved Document G.
Our calculations are based on:
• Building Regulations 2010 – Part G
• Regulation 36 – Water efficiency of new dwellings
• Approved Document G – Sanitation, hot water safety and water efficiency
• Water efficiency calculation methodology in Approved Document G
Whether you require an Water Efficiency Calculation on its own or alongside other compliance services, we’ll help coordinate the process through one trusted provider, making property compliance simpler to manage.
Our competent surveyors carry out Water Efficiency Calculation across a wide range of commercial and residential properties, ensuring each survey is appropriate for the building and its intended use.
Based in Manchester with a particular focus on Greater Manchester and the wider North West. But our team supports clients across the UK, so wherever your properties are located, we’re ready to help.
Our compliance reports are written in plain English, with clear findings, practical recommendations and documentation that’s ready to use. No unnecessary jargon, just reports that help you act quickly and stay compliant.
From your first enquiry to your final report and beyond, we’re committed to clear communication, prompt responses and proactive recommendations and reminders to help you stay compliant without the stress.
We coordinate your compliance services in one place, reducing administration, saving time and making property compliance easier to manage, so you can focus on supporting your residents.
Working with the Compliance Company is always great, they produce their work in a timely and professional manner.
Communication is always top notch too, which is really appreciated. They are our go to consultants for anything Part L or SBEM related.
Very happy with their prompt noise survey and report. All done smoothly and within the timescales communicated during quotation. Highly recommended!
Ryan was exceedingly helpful. A wealth of guidance, advice, and wisdom. Very personable, professional, and honest. He answered all my questions promptly and thoroughly.
It’s very refreshing when you don’t have to chase people! Really cannot recommend Ryan enough. He and his business are top-notch
We provide Energy Statements across the UK, supporting commercial property owners, landlords, housing providers, managing agents, contractors and organisations responsible for maintaining safe, compliant buildings.
Our surveyors regularly work across:
• Greater Manchester (Manchester, Salford, Bolton, Stockport, Oldham, Rochdale, Bury, Tameside, Trafford, Wigan)
• Merseyside (Liverpool, Wirral, St Helens, Southport, Knowsley, Sefton)
• Cheshire (Chester, Warrington, Crewe, Macclesfield, Northwich, Ellesmere Port, Wilmslow)
• Lancashire (Preston, Blackburn, Blackpool, Burnley, Accrington, Rossendale, Chorley, Lancaster)
• West Yorkshire (Leeds, Bradford, Wakefield, Huddersfield, Halifax, Dewsbury, Batley)
• South Yorkshire (Sheffield, Doncaster, Rotherham, Barnsley)
• North Yorkshire (York, Harrogate, Scarborough, Ripon, Selby, Skipton)
• East Midlands (Derby, Nottingham, Leicester, Derbyshire, Nottinghamshire, Leicestershire)
• Staffordshire (Stoke-on-Trent, Stafford, Tamworth, Newcastle-under-Lyme, Burton upon Trent)
• West Midlands (Birmingham, Coventry, Wolverhampton, Solihull, Walsall, Dudley, Sandwell)
• North East (Newcastle, Sunderland, Gateshead, Middlesbrough, Darlington, Durham)
• East Anglia (Cambridge, Norwich, Ipswich, Peterborough)
• Greater London (Central, North, South, East, West London)
• Kent (Maidstone, Canterbury, Medway, Ashford, Dartford, Tunbridge Wells)
• Surrey (Guildford, Woking, Reigate, Epsom, Redhill)
• Essex (Chelmsford, Colchester, Basildon, Southend-on-Sea, Harlow)
• South Coast (Hampshire, Sussex, Portsmouth, Southampton, Brighton, Eastbourne)
• South West (Bristol, Devon, Cornwall, Somerset, Gloucestershire, Plymouth, Exeter, Bath, Gloucester, Cheltenham, Taunton)
• South Wales (Cardiff, Newport, Swansea, Bridgend, Merthyr Tydfil)
• Scotland (Glasgow, Edinburgh, Aberdeen, Dundee, Stirling, Perth)
For new dwellings in England, Regulation 36 requires the potential consumption of wholesome water to meet the applicable water-efficiency standard. The assessment is carried out using the methodology in Approved Document G.
The current standard is 125 litres per person per day. An optional higher standard of 110 litres per person per day applies where the planning permission specifies that requirement.
The calculation can include water-consuming fittings and appliances such as WCs, taps, showers, baths, washing machines and dishwashers. Manufacturer product information is used to determine the relevant water consumption.
It should ideally be carried out during the design stage, before sanitary fittings and water-consuming appliances are finalised. This makes it easier to change the specification if the proposed products do not meet the required target.
Yes. We can carry out Water Efficiency Calculations for individual dwellings and larger residential developments, including apartment schemes and other multi-unit projects.
New homes need to demonstrate compliance with the energy efficiency requirements of Part L of the Building Regulations. SAP calculations assess the energy performance of a dwelling and help determine whether the proposed design meets the required standards.
We provide SAP calculations for new-build and conversion projects, assessing energy performance, carbon emissions and key building specifications, and provide the reports needed for Building Control and compliance.
Non-domestic buildings need to demonstrate compliance with the energy efficiency requirements of Part L of the Building Regulations. SBEM assesses the energy performance of buildings such as offices, retail units and commercial spaces against the required standards.
We provide SBEM assessments for new-build and commercial projects, modelling energy performance, carbon emissions and building specifications, and providing the reports needed for Building Control and compliance.
Overheating can affect comfort, health and the performance of new homes. Under Part O of the Building Regulations, new residential buildings must be designed to reduce the risk of overheating and provide adequate means of removing excess heat.
We carry out Part O overheating assessments using the Simplified Method or Dynamic Thermal Modelling, providing clear results and compliance documentation for your project.
Whether you’re managing a residential property, supported accommodation, office, school or commercial premises, an EPC provides an A–G energy efficiency rating and recommendations for improvement.
EPC requirements apply to many properties when they are constructed, sold or rented, with Minimum Energy Efficiency Standards (MEES) also applying to certain rented properties.
We carry out EPC assessments and provide the certification and information you need to understand your property’s energy performance and meet applicable requirements.
Energy performance needs to be considered early in the design process, particularly where planning requirements call for a clear strategy for reducing energy use and carbon emissions.
We prepare energy statements for residential and commercial developments, assessing energy demand, efficiency measures and low-carbon technologies to demonstrate how a project meets its energy and sustainability targets.
Default thermal bridging values can be conservative, potentially leading to higher insulation requirements and unnecessary costs. Bespoke PSI values provide a more accurate picture of how heat moves through your building’s junctions and support compliance with Part L of the Building Regulations.
We calculate bespoke thermal bridging values for your project, helping improve SAP accuracy, optimise your specification and demonstrate compliance without over-specifying materials.
Air leakage can affect a building’s energy performance and its compliance with Part L of the Building Regulations. For new dwellings, air pressure testing is an important part of demonstrating that the required standards for air permeability have been met.
We carry out accurate air pressure tests, identify air leakage and provide the certification and reporting needed for building control.
Poor sound insulation can affect comfort, privacy and compliance in residential developments. Under Part E of the Building Regulations, buildings must provide appropriate resistance to the passage of sound.
We carry out airborne and impact sound testing to assess acoustic performance, identify issues and provide the test results and reporting needed for building control.
Is the ventilation system actually delivering the airflow it was designed for? Our testing checks MEV, MVHR and other mechanical ventilation systems at individual terminals, helping identify performance issues before they hold up sign-off.
We provide accurate flow-rate results and the certification needed to demonstrate compliance with Part F of the Building Regulations.
Compliance in supported housing is a different beast.
It has stricter frameworks, sector-specific requirements and a very different set of responsibilities.
We have a specialist division built entirely for it. Same one-stop-shop approach, built specifically for housing providers, care organisations and nominated individuals managing property compliance.
