[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"main-navigation:https:\u002F\u002Fportal.easycompliancetools.com\u002Fux\u002Fget-main-nav":3,"footer-navigation:footer-nav-1":45,"blog-post-when-is-a-part-g-water-efficiency-calculation-required":54,"footer-navigation:footer-nav-2":365,"hub-sidebar":377},{"id":4,"name":5,"slug":6,"is_footer_nav":7,"is_top_nav":8,"is_primary":8,"description":9,"nav_data":10,"created_at":43,"updated_at":44},4,"Simple Main 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Is a Part G Water Efficiency Calculation Required?","A Part G water efficiency calculation is often needed for new homes, flats and certain residential conversion projects to show that the dwelling meets the water efficiency requirements of Building Regulations.",[63],{"name":64,"id":65,"componentName":66,"bgImage":9,"bgColor":9,"margin":9,"parentAlign":67,"padding":9,"classes":9,"colSpan":9,"cols":68,"colsMD":69,"originalModel":70,"bgColorOpacity":78,"bgImageVisibility":79,"bgImageSize":80,"bgImagePosition":81,"bgImageRepeat":82,"bgImageAttachment":83,"bgImageOpacity":78,"bgImageVisibilitySM":9,"bgImageVisibilityMD":9,"bgImageVisibilityLG":9,"bgImageSizeSM":9,"bgImageSizeMD":9,"bgImageSizeLG":9,"bgImagePositionSM":9,"bgImagePositionMD":9,"bgImagePositionLG":9,"borderWidth":9,"borderPosition":9,"borderColor":9,"borderRadius":9,"sticky":7,"stickyTop":94,"stickyDisableSmall":7,"equalHeightRows":7,"fillParentHeight":7,"containerWidth":95},"Full Column Block","ff0d2e86-bf31-45e8-8da0-3a64be195e84","ColContainer","w-full","grid-cols-1","md:grid-cols-12",[71],[72,84],{"classes":73,"customColSpan":7,"id":74,"colSpan":73,"colSpanSM":75,"colSpanMD":76,"colSpanLG":77,"borderWidth":9,"borderPosition":9,"borderColor":9,"borderRadius":9,"bgColorOpacity":78,"bgImage":9,"bgImageVisibility":79,"bgImageSize":80,"bgImagePosition":81,"bgImageRepeat":82,"bgImageAttachment":83,"bgImageOpacity":78,"bgImageVisibilitySM":9,"bgImageVisibilityMD":9,"bgImageVisibilityLG":9,"bgImageSizeSM":9,"bgImageSizeMD":9,"bgImageSizeLG":9,"bgImagePositionSM":9,"bgImagePositionMD":9,"bgImagePositionLG":9},"col-span-1","da58bef1-c5ea-4cd6-899f-55c669acc40b","sm:col-span-12","md:col-span-12","lg:col-span-12",100,"visible","cover","center center","no-repeat","scroll",{"name":85,"componentName":86,"group":87,"margin":9,"padding":9,"classes":9,"bgImage":9,"id":88,"originalModel":89},"WYSIWYG Editor","Wysiwyg","content","70abbaf7-211d-4087-b4bf-e4ce6fa5e610",{"proseEnabled":8,"content":90,"lineHeightClass":91,"trackingClass":92,"spacingClass":93,"margin":9,"marginSM":9,"marginMD":9,"marginLG":9,"marginTop":9,"marginTopSM":9,"marginTopMD":9,"marginTopLG":9,"marginRight":9,"marginRightSM":9,"marginRightMD":9,"marginRightLG":9,"marginBottom":9,"marginBottomSM":9,"marginBottomMD":9,"marginBottomLG":9,"marginLeft":9,"marginLeftSM":9,"marginLeftMD":9,"marginLeftLG":9,"padding":9,"paddingSM":9,"paddingMD":9,"paddingLG":9},"\u003Carticle>\u003Cheader>\n\u003Ch1>When Is a Part G Water Efficiency Calculation Required?\u003C\u002Fh1>\n\u003Cp>A Part G water efficiency calculation is often needed for new homes, flats and certain residential conversion projects to show that the dwelling meets the water efficiency requirements of Building Regulations.\u003C\u002Fp>\n\u003Cp>This guide explains when a Part G calculation is usually required, what Building Control is looking for, when the 125 and 110 litres per person per day targets apply, and what information you need before completing a calculation.\u003C\u002Fp>\n\u003C\u002Fheader>\n\u003Csection>\n\u003Ch2>What is a Part G water efficiency calculation?\u003C\u002Fh2>\n\u003Cp>A Part G water efficiency calculation estimates the expected water use of a new dwelling in litres per person per day. It is used to demonstrate that the design meets the water efficiency requirement in Approved Document G of the Building Regulations.\u003C\u002Fp>\n\u003Cp>The calculation looks at the water use from fittings and fixed appliances such as toilets, taps, showers, baths, dishwashers and washing machines. It may also include water reuse systems such as rainwater harvesting or greywater recycling where they are included in the design.\u003C\u002Fp>\n\u003Cp>Approved Document G explains that the estimated consumption of wholesome water for a new dwelling should be no more than 125 litres per person per day, or 110 litres per person per day where the optional requirement applies. \u003Ca href=\"https:\u002F\u002Fwww.gov.uk\u002Fgovernment\u002Fpublications\u002Fsanitation-hot-water-safety-and-water-efficiency-approved-document-g\" target=\"_blank\" rel=\"noopener noreferrer\" draggable=\"false\">Read Approved Document G on GOV.UK\u003C\u002Fa>.\u003C\u002Fp>\n\u003Cp>You can use our \u003Ca href=\"https:\u002F\u002Feasycompliancetools.com\u002Fwater-efficiency-calculator\" draggable=\"false\">Part G Water Efficiency Calculator\u003C\u002Fa> to complete the calculation online and generate a structured report for Building Control.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>When is a Part G calculation required?\u003C\u002Fh2>\n\u003Cp>A Part G water efficiency calculation is usually required when Building Control needs evidence that a new dwelling meets the water efficiency target.\u003C\u002Fp>\n\u003Cp>This most commonly applies to:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>New-build houses\u003C\u002Fli>\n\u003Cli>New-build flats\u003C\u002Fli>\n\u003Cli>New dwellings created within a block of flats\u003C\u002Fli>\n\u003Cli>Residential developments with multiple plot types\u003C\u002Fli>\n\u003Cli>Certain conversions or material change of use projects that create new dwellings\u003C\u002Fli>\n\u003Cli>Projects where Building Control asks for a water efficiency calculation before completion\u003C\u002Fli>\n\u003Cli>Projects where a planning condition requires the tighter 110 litres per person per day target\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>If you are building or creating a new dwelling, it is sensible to expect Building Control to ask for evidence of Part G water efficiency compliance.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Is it required for every new house or flat?\u003C\u002Fh2>\n\u003Cp>Yes, the water efficiency requirement applies to new dwellings. The dwelling must be designed so that the estimated consumption of wholesome water does not exceed the relevant target.\u003C\u002Fp>\n\u003Cp>For most standard new dwellings, the target is:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>125 litres per person per day\u003C\u002Fstrong>\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Where the optional tighter requirement applies, the target is:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>110 litres per person per day\u003C\u002Fstrong>\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Approved Document G also states that where a building contains more than one dwelling, such as a block of flats, each individual dwelling should be designed so that its estimated water consumption is no greater than the target.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>When does the 110 litres per person per day target apply?\u003C\u002Fh2>\n\u003Cp>The 110 litres per person per day target does not automatically apply to every project.\u003C\u002Fp>\n\u003Cp>Approved Document G explains that the optional requirement applies where it is imposed as part of the planning permission and made a condition that must be complied with.\u003C\u002Fp>\n\u003Cp>In practical terms, check the planning decision notice or planning conditions. If the project has a planning condition requiring reduced water consumption, water neutrality, or a 110 litres per person per day standard, then the calculation should be completed against the 110 target.\u003C\u002Fp>\n\u003Cp>If there is no such condition, the usual target is normally 125 litres per person per day.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>When might Building Control ask for the calculation?\u003C\u002Fh2>\n\u003Cp>Building Control may ask for the water efficiency calculation during plan checking, during the build, or near completion.\u003C\u002Fp>\n\u003Cp>Approved Document G refers to notification of the water efficiency calculation to the Building Control Body. The notice should specify the applicable target and the calculated potential consumption of wholesome water per person per day for the completed dwelling.\u003C\u002Fp>\n\u003Cp>In many cases, this is needed before Building Control will issue the completion certificate or final certificate.\u003C\u002Fp>\n\u003Cp>For that reason, it is better to complete the calculation before fixtures and appliances are finalised, rather than waiting until the end of the project and discovering the specification does not meet the target.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Can you use the fittings approach instead?\u003C\u002Fh2>\n\u003Cp>Approved Document G includes a fittings approach as an alternative to completing the full water efficiency calculator in some cases.\u003C\u002Fp>\n\u003Cp>This means that if all fittings and relevant appliances are within the stated maximum consumption values, the project may be able to state compliance using the fittings approach.\u003C\u002Fp>\n\u003Cp>However, the water efficiency calculator must be completed where the fittings exceed the stated values. Approved Document G also says the calculator must be completed where:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>No shower is provided\u003C\u002Fli>\n\u003Cli>A waste disposal unit is provided\u003C\u002Fli>\n\u003Cli>A water softener is provided\u003C\u002Fli>\n\u003Cli>Water reuse is provided, such as greywater or rainwater systems\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>For many real projects, completing the calculator is the clearer option because it gives a specific litres per person per day result.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>When is a Part G calculation needed for a block of flats?\u003C\u002Fh2>\n\u003Cp>For blocks of flats, the calculation should be considered for each dwelling or each repeated dwelling type.\u003C\u002Fp>\n\u003Cp>If all flats of the same type use the same fittings, fixtures, appliances and water systems, you may be able to calculate by plot type and list the plot numbers or flat numbers covered by that calculation.\u003C\u002Fp>\n\u003Cp>For example, a development might have:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Type A one-bedroom flat\u003C\u002Fli>\n\u003Cli>Type B two-bedroom flat\u003C\u002Fli>\n\u003Cli>Type C three-bedroom flat\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Each type can have its own water efficiency calculation, with the relevant flat numbers recorded against it.\u003C\u002Fp>\n\u003Cp>Our \u003Ca href=\"https:\u002F\u002Feasycompliancetools.com\u002Fwater-efficiency-calculator\" draggable=\"false\">online Part G calculator\u003C\u002Fa> supports multiple plot groups, so you can calculate repeated house or flat types and generate a certificate pack.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Is a Part G calculation required for extensions?\u003C\u002Fh2>\n\u003Cp>A Part G water efficiency calculation is generally about new dwellings, not ordinary domestic extensions to an existing dwelling.\u003C\u002Fp>\n\u003Cp>For example, if you are adding a single-storey extension to an existing house, Building Control may still need to consider plumbing, hot water safety, drainage and sanitary provision, but a new dwelling water efficiency calculation is not usually the relevant requirement unless the work creates a new dwelling.\u003C\u002Fp>\n\u003Cp>If the extension or building work creates a separate new dwelling, flat, annexe or self-contained residential unit, you should check with Building Control whether a Part G water efficiency calculation is required.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Is it required for a conversion or change of use?\u003C\u002Fh2>\n\u003Cp>It can be required where the work creates a new dwelling or changes a building into residential use in a way that brings the water efficiency requirement into scope.\u003C\u002Fp>\n\u003Cp>Examples may include:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Converting an office into flats\u003C\u002Fli>\n\u003Cli>Converting a commercial building into dwellings\u003C\u002Fli>\n\u003Cli>Creating a new flat above a shop\u003C\u002Fli>\n\u003Cli>Subdividing a building into separate residential units\u003C\u002Fli>\n\u003Cli>Changing a building so that it contains new dwellings\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Conversion projects can be more nuanced than new-build plots, so it is sensible to confirm the requirement with the Building Control Body early in the project.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Is a Part G calculation required for existing homes?\u003C\u002Fh2>\n\u003Cp>Not usually, if there is no relevant building work creating a new dwelling or triggering Building Regulations approval for water efficiency.\u003C\u002Fp>\n\u003Cp>For example, you would not normally complete a Part G water efficiency calculation just because someone is selling an existing house, replacing a tap, replacing a shower, or fitting a new washing machine.\u003C\u002Fp>\n\u003Cp>However, if the existing property is being converted, split into flats, rebuilt, or changed in a way that creates a new dwelling, a calculation may be required.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>What information do you need for a Part G calculation?\u003C\u002Fh2>\n\u003Cp>To complete a water efficiency calculation, you need details of the fittings, fixtures, appliances and water systems in the dwelling.\u003C\u002Fp>\n\u003Cp>Typical information includes:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Number of bedrooms\u003C\u002Fli>\n\u003Cli>Target: 125 or 110 litres per person per day\u003C\u002Fli>\n\u003Cli>Number of toilets\u003C\u002Fli>\n\u003Cli>Toilet flush volumes\u003C\u002Fli>\n\u003Cli>Number of wash hand basins\u003C\u002Fli>\n\u003Cli>Basin tap flow rates\u003C\u002Fli>\n\u003Cli>Number of showers\u003C\u002Fli>\n\u003Cli>Shower flow rates\u003C\u002Fli>\n\u003Cli>Number of baths\u003C\u002Fli>\n\u003Cli>Bath capacity in litres\u003C\u002Fli>\n\u003Cli>Kitchen and utility tap flow rates\u003C\u002Fli>\n\u003Cli>Dishwasher water use\u003C\u002Fli>\n\u003Cli>Washing machine water use\u003C\u002Fli>\n\u003Cli>Whether a waste disposal unit is present\u003C\u002Fli>\n\u003Cli>Whether a water softener is present\u003C\u002Fli>\n\u003Cli>Whether greywater recycling is used\u003C\u002Fli>\n\u003Cli>Whether rainwater harvesting is used\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Manufacturer figures are useful where available, especially for sanitaryware, taps, showers and appliances.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>What affects the result most?\u003C\u002Fh2>\n\u003Cp>The final litres per person per day result can be affected by several parts of the specification.\u003C\u002Fp>\n\u003Cp>The most common items that influence the result are:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Shower flow rate\u003C\u002Fstrong> — high-flow showers can increase the result significantly.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Bath capacity\u003C\u002Fstrong> — larger baths increase estimated water use.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Toilet flush volumes\u003C\u002Fstrong> — efficient dual-flush WCs can help reduce consumption.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Tap flow rates\u003C\u002Fstrong> — basin, kitchen and utility taps all contribute.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Appliance values\u003C\u002Fstrong> — dishwashers and washing machines are included where relevant.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Waste disposal units\u003C\u002Fstrong> — these add a fixed allowance where present.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Water softeners\u003C\u002Fstrong> — certain systems can add water use for regeneration.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Rainwater or greywater systems\u003C\u002Fstrong> — these can reduce the final wholesome water consumption where designed properly.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>This is why it is useful to complete the calculation before ordering final sanitaryware and appliances.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>What is the difference between 125 and 110?\u003C\u002Fh2>\n\u003Cp>The 125 litres per person per day target is the standard water efficiency target for new dwellings under Approved Document G.\u003C\u002Fp>\n\u003Cp>The 110 litres per person per day target is the optional tighter requirement. It applies only where imposed through planning permission.\u003C\u002Fp>\n\u003Cp>Meeting 110 litres per person per day usually requires a more efficient specification. This may mean lower-flow showers and taps, smaller bath capacity, efficient WCs, and careful appliance choices.\u003C\u002Fp>\n\u003Cp>If the wrong target is used, the report may not satisfy Building Control or the planning condition, so always check the required target before completing the calculation.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>When should you complete the calculation?\u003C\u002Fh2>\n\u003Cp>Ideally, complete the Part G water efficiency calculation during design or specification, before final fixtures and appliances are ordered.\u003C\u002Fp>\n\u003Cp>This gives you time to adjust the specification if the result is too high.\u003C\u002Fp>\n\u003Cp>Common points to complete the calculation include:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Before submitting detailed Building Control information\u003C\u002Fli>\n\u003Cli>When sanitaryware and appliance specifications are being chosen\u003C\u002Fli>\n\u003Cli>Before completion, when Building Control requests the calculation\u003C\u002Fli>\n\u003Cli>When a planning condition requires the 110 litres per person per day standard\u003C\u002Fli>\n\u003Cli>When a developer needs a certificate pack for several plots or flat types\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>What happens if the calculation fails?\u003C\u002Fh2>\n\u003Cp>If the result is above the target, the dwelling does not demonstrate compliance using the current specification.\u003C\u002Fp>\n\u003Cp>You may need to adjust the design by changing one or more items, such as:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Reducing shower flow rates\u003C\u002Fli>\n\u003Cli>Using lower-flow taps\u003C\u002Fli>\n\u003Cli>Specifying more efficient WCs\u003C\u002Fli>\n\u003Cli>Reducing bath capacity\u003C\u002Fli>\n\u003Cli>Reviewing dishwasher or washing machine values\u003C\u002Fli>\n\u003Cli>Removing or accounting correctly for waste disposal units\u003C\u002Fli>\n\u003Cli>Reviewing water softener assumptions\u003C\u002Fli>\n\u003Cli>Adding or properly specifying rainwater or greywater systems where appropriate\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Once the specification changes, the calculation should be updated so the report reflects the actual design.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>What does Building Control need to see?\u003C\u002Fh2>\n\u003Cp>Building Control generally needs a clear record showing:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>The dwelling or plot type being assessed\u003C\u002Fli>\n\u003Cli>The target used, either 125 or 110 litres per person per day\u003C\u002Fli>\n\u003Cli>The calculated litres per person per day result\u003C\u002Fli>\n\u003Cli>The fittings, fixtures and appliances used in the calculation\u003C\u002Fli>\n\u003Cli>Any water reuse systems included\u003C\u002Fli>\n\u003Cli>Whether the result passes the required target\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Approved Document G says a record of the sanitary appliances and relevant white goods used in the calculation should be provided, along with enough information for building owners or occupiers to maintain the water efficiency of the building.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Common situations where a Part G calculation is requested\u003C\u002Fh2>\n\u003Cp>You may be asked for a Part G water efficiency calculation if you are involved in:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>A new-build house\u003C\u002Fli>\n\u003Cli>A small housing development\u003C\u002Fli>\n\u003Cli>A block of flats\u003C\u002Fli>\n\u003Cli>A barn conversion into a dwelling\u003C\u002Fli>\n\u003Cli>A commercial-to-residential conversion\u003C\u002Fli>\n\u003Cli>A flat conversion\u003C\u002Fli>\n\u003Cli>A project with a 110 litres per person per day planning condition\u003C\u002Fli>\n\u003Cli>A development where Building Control needs a completion document\u003C\u002Fli>\n\u003Cli>A project using rainwater harvesting or greywater recycling\u003C\u002Fli>\n\u003Cli>A dwelling with no shower, a waste disposal unit, or a water softener\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>When a Part G calculation may not be needed\u003C\u002Fh2>\n\u003Cp>A Part G water efficiency calculation is not normally needed for every plumbing change or ordinary domestic improvement.\u003C\u002Fp>\n\u003Cp>It may not be needed for:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>Replacing an existing tap like-for-like\u003C\u002Fli>\n\u003Cli>Replacing a shower in an existing dwelling\u003C\u002Fli>\n\u003Cli>Changing a washing machine or dishwasher in an existing home\u003C\u002Fli>\n\u003Cli>Routine bathroom refurbishment where no new dwelling is created\u003C\u002Fli>\n\u003Cli>Ordinary maintenance or repair work\u003C\u002Fli>\n\u003Cli>Existing homes with no relevant Building Regulations application\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>If you are unsure, ask your Building Control Body before assuming it is not required.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Complete a Part G water efficiency calculation online\u003C\u002Fh2>\n\u003Cp>If you need to provide a calculation for Building Control, our online tool guides you through the required inputs and generates a structured Part G water efficiency report.\u003C\u002Fp>\n\u003Cp>You can use it for single dwellings or multiple plot types, including repeated house types or flat types.\u003C\u002Fp>\n\u003Cp>\u003Ca href=\"https:\u002F\u002Feasycompliancetools.com\u002Fwater-efficiency-calculator\" draggable=\"false\">Start your Part G Water Efficiency Calculation here\u003C\u002Fa>.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Quick checklist: do you need a Part G calculation?\u003C\u002Fh2>\n\u003Ch3>You probably need one if:\u003C\u002Fh3>\n\u003Cul>\n\u003Cli>You are building a new house\u003C\u002Fli>\n\u003Cli>You are building new flats\u003C\u002Fli>\n\u003Cli>You are creating a new dwelling through conversion or change of use\u003C\u002Fli>\n\u003Cli>Building Control has asked for a water efficiency calculation\u003C\u002Fli>\n\u003Cli>A planning condition requires 110 litres per person per day\u003C\u002Fli>\n\u003Cli>You need to notify Building Control of the calculated water consumption\u003C\u002Fli>\n\u003Cli>The dwelling uses water reuse, a waste disposal unit or a water softener\u003C\u002Fli>\n\u003Cli>You need a clear certificate or calculation record for a plot type\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>You may not need one if:\u003C\u002Fh3>\n\u003Cul>\n\u003Cli>You are only working on an existing home\u003C\u002Fli>\n\u003Cli>No new dwelling is being created\u003C\u002Fli>\n\u003Cli>The work is ordinary maintenance or replacement\u003C\u002Fli>\n\u003Cli>Building Control has not requested water efficiency evidence\u003C\u002Fli>\n\u003Cli>The work is not within the scope of a relevant Building Regulations application\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Final advice\u003C\u002Fh2>\n\u003Cp>A Part G water efficiency calculation is mainly about proving that a new dwelling has been designed to avoid excessive water use.\u003C\u002Fp>\n\u003Cp>For most new dwellings, the target is 125 litres per person per day. Where the optional planning condition applies, the target is 110 litres per person per day.\u003C\u002Fp>\n\u003Cp>The safest approach is to complete the calculation early, check the result, and keep a clear record for Building Control.\u003C\u002Fp>\n\u003Cp>If you already know your plot type, bedrooms, target and fixture details, you can \u003Ca href=\"https:\u002F\u002Feasycompliancetools.com\u002Fwater-efficiency-calculator\" draggable=\"false\">complete your Part G calculation online\u003C\u002Fa>.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003Csection>\n\u003Ch2>Frequently asked questions\u003C\u002Fh2>\n\u003Ch3>Is a Part G calculation required for new builds?\u003C\u002Fh3>\n\u003Cp>Yes, new dwellings need to demonstrate compliance with the Part G water efficiency requirement. This is usually done using the water efficiency calculator or, in some cases, the fittings approach.\u003C\u002Fp>\n\u003Ch3>What is the Part G water efficiency target?\u003C\u002Fh3>\n\u003Cp>The standard target is 125 litres per person per day. The optional tighter target is 110 litres per person per day where it is imposed through planning permission.\u003C\u002Fp>\n\u003Ch3>Who asks for the Part G calculation?\u003C\u002Fh3>\n\u003Cp>The Building Control Body will usually require evidence of the calculated water consumption before completion or final certification.\u003C\u002Fp>\n\u003Ch3>Do I need a calculation for a block of flats?\u003C\u002Fh3>\n\u003Cp>Yes, the water efficiency requirement applies to each individual dwelling. Repeated flat types can usually be calculated as plot types if the same specification applies.\u003C\u002Fp>\n\u003Ch3>Do I need a Part G calculation for an extension?\u003C\u002Fh3>\n\u003Cp>Not usually for a normal extension to an existing dwelling. However, if the work creates a new dwelling or separate residential unit, check with Building Control.\u003C\u002Fp>\n\u003Ch3>What happens if my calculation is over 125 or 110?\u003C\u002Fh3>\n\u003Cp>The specification may need to be changed. This could involve lower-flow taps or showers, more efficient WCs, smaller bath capacity, different appliance values, or water reuse measures where appropriate.\u003C\u002Fp>\n\u003Ch3>Can I complete the calculation myself?\u003C\u002Fh3>\n\u003Cp>Yes, if you have the correct fixture, appliance and water system details. The important thing is that the calculation uses the correct target and reflects the actual design or installed specification.\u003C\u002Fp>\n\u003C\u002Fsection>\n\u003C\u002Farticle>","leading-relaxed","tracking-normal","[&_p]:my-0 [&_p+p]:mt-4",0,"max-w-5xl mx-auto","14-07-2026","2026-07-14T16:53:48.000000Z","2026-07-14T19:46:17.000000Z",{"hide_featured_image_on_page":7},{"id":101,"meta_title":60,"meta_description":16,"seoable_id":56,"seoable_type":102,"keyword_focus":103,"search_intent":104,"cornerstone_content":7,"canonical_url":105,"meta_robots":106,"og_title":60,"og_description":9,"og_image":9,"og_type":107,"og_url":105,"twitter_card":108,"twitter_title":60,"twitter_description":9,"twitter_image":9,"schema_markup":109,"extra_meta":9,"ai_field_locks":110,"insights":9,"serp_insights":9,"hreflang_alternates":9,"json_ld":9,"sitemap_changefreq":111,"sitemap_priority":112,"created_at":113,"updated_at":98},27,"Kabaddle\\BlogModule\\Models\\Post","When Is a Part G Water Efficiency 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A suitable fire risk assessment helps you identify how a fire could start, who may be at risk, whether people could escape safely and what improvements are needed.","\u002Fhub\u002Ffire-risk-assessment-for-a-small-shop-complete-uk-guide","19-07-2026",{"title":393,"slug":394,"excerpt":395,"full_url":396,"featured_image":9,"featured_image_alt":9,"publish_date":397},"Inner Rooms in Fire Risk Assessments | Escape Route Guide","inner-rooms-fire-risk-assessment-guide","An inner room is one of those fire risk assessment terms that can confuse people. It sounds technical, but the basic idea is simple: can someone leave the room safely, or do they have to escape through another room first?","\u002Fhub\u002Finner-rooms-fire-risk-assessment-guide","17-07-2026",{"title":399,"slug":400,"excerpt":401,"full_url":402,"featured_image":9,"featured_image_alt":9,"publish_date":403},"Thermostatic Mixing Valves and Legionella: UK Guide","thermostatic-mixing-valves-legionella","This guide explains what a thermostatic mixing valve is, how to recognise one, why its location matters, what maintenance may be required and how temperature checks should be approached.","\u002Fhub\u002Fthermostatic-mixing-valves-legionella","16-07-2026",{"title":405,"slug":406,"excerpt":407,"full_url":408,"featured_image":9,"featured_image_alt":9,"publish_date":96},"When Is a Professional Legionella Risk Assessor Required?","when-is-a-professional-legionella-risk-assessor-required","Not every simple property needs a specialist Legionella consultant, but some water systems and premises do need professional input. This guide explains when a guided Legionella risk assessment may be suitable, and when you should use a competent professional Legionella risk assessor.","\u002Fhub\u002Fwhen-is-a-professional-legionella-risk-assessor-required",{"data":410},[411,416,422,427],{"id":412,"parent_id":9,"slug":413,"title":414,"created_at":415,"updated_at":415,"meta_title":414,"meta_description":9,"active_posts_count":57,"label":414},5,"coshh-assessments","COSHH Assessments","2026-07-20T19:08:28.000000Z",{"id":417,"parent_id":9,"slug":418,"title":419,"created_at":420,"updated_at":420,"meta_title":9,"meta_description":9,"active_posts_count":421,"label":419},2,"fire-risk-assessments","Fire Risk Assessments","2026-07-14T10:25:53.000000Z",3,{"id":57,"parent_id":9,"slug":423,"title":424,"created_at":425,"updated_at":426,"meta_title":9,"meta_description":9,"active_posts_count":421,"label":424},"legionella-risk-assessments","Legionella Risk Assessments","2025-10-17T13:02:34.000000Z","2026-07-14T10:25:44.000000Z",{"id":4,"parent_id":9,"slug":116,"title":117,"created_at":118,"updated_at":118,"meta_title":9,"meta_description":9,"active_posts_count":57,"label":117}]