natural mechanical ventilation without heat recovery (MV) mechanical extract, decentralised (MEV dc) mechanical extract, centralised (MEV c) mechanical ventilation with heat recovery (MVHR) positive input from loft positive input from outside not radiators or underfloor radiators underfloor fan coil units both radiators and underfloor England and Wales: before 1900; Scotland: before 1919; Northern Ireland: before 1919 England and Wales: 1900-1929; Scotland: 1919-1929; Northern Ireland: 1919-1929 England and Wales: 1930-1949; Scotland: 1930-1949; Northern Ireland: 1930-1949 England and Wales: 1950-1966; Scotland: 1950-1964; Northern Ireland: 1950-1973 England and Wales: 1967-1975; Scotland: 1965-1975; Northern Ireland: 1974-1977 England and Wales: 1976-1982; Scotland: 1976-1983; Northern Ireland: 1978-1985 England and Wales: 1983-1990; Scotland: 1984-1991; Northern Ireland: 1986-1991 England and Wales: 1991-1995; Scotland: 1992-1998; Northern Ireland: 1992-1999 England and Wales: 1996-2002; Scotland: 1999-2002; Northern Ireland: 2000-2006 England and Wales: 2003-2006; Scotland: 2003-2007; Northern Ireland: not applicable England and Wales: 2007-2011; Scotland: 2008-2011; Northern Ireland: 2007-2013 England and Wales: 2012-2021; Scotland: 2012-2022; Northern Ireland: 2014 onwards England and Wales: 2022 onwards; Scotland: 2023 onwards (TBA); Northern Ireland: 2014 onwards (TBA) Not applicable Not recorded double glazing installed before 2002 in EAW, 2003 in SCT, 2006 NI double glazing installed between 2002-2022 in EAW, 2003-2023 in SCT, 2006-2022 NI double glazing, unknown install date secondary glazing, unknown data single glazing triple glazing, unknown install date double, known data triple, known data not defined triple glazing, installed between 2002-2022 in EAW, 2003-2023 in SCT, 2006-2022 NI triple glazing, installed before 2002 in EAW, 2003 in SCT, 2006 NI secondary glazing, normal emissivity secondary glazing, low emissivity double glazing, installed during or after 2022 in EAW, 2023 in SCT, 2022 NI triple glazing, installed during or after 2022 in EAW, 2023 in SCT, 2022 NI Normal More Than Typical Less Than Typical Much More Than Typical Much Less Than Typical Not Defined external filled cavity internal as built unknown filled cavity + external filled cavity + internal unknown None 12mm 25mm 50mm 75mm 100mm 125mm 150mm 175mm 200mm 225mm 250mm 270mm 300mm 350mm 400mm or more Not Defined exposed party Sheltered connected or adjacent to heated space Other mineral wool or EPS slab PUR or PIR Rafters Joists No access.. This is retained for backwards compatibility only and should not be used. No access is covered by enum 5 of RoofTypeCode Unknown None; applicable only when Roof-Construction is 4, 5 or 6 Flat roof insulation Sloping ceiling insulation Not Defined Code which indicates the type of solar collector. unglazed flat panel evacuated tube Code which indicates the source of solar collector data. default declared values dual Single Unknown dual (24 hour) off-peak 18 hour off-peak 10 hour 0mm 12mm 25 mm 38 mm 50 mm 80 mm 120mm 160mm lowest occupied lowest+1 lowest+2 lowest+3 lowest+4 lowest+5 lowest+6 roof rooms not recorded None factory-applied loose jacket No Access No Cylinder Normal - up to 130 litres Medium - between 131 and 170 litres Large - greater than 170 litres. actual size included in Solar-Water-Heating-Details Exact cylinder volume if known Dual Single not applicable A SAP Heating Code is a code specified in the RD/SAP specification to identify characteristics of the heating system. They are a numerical codes selected from a standard list detailed in the specification. Detached Semi-Detached End-Terrace Mid-Terrace Enclosed End-Terrace Enclosed Mid-Terrace Not Recorded Main Property 1st Extension 2nd Extension 3rd Extension 4th Extension Codes indicating average height of a room, storey or building part 1 storey 1.5 storey 2 storey 2.5 storey 3 storey no corridor heated corridor unheated corridor Voluntary (No legal requirement for an EPC). exposed floor semi-exposed upper floor to unheated space semi-exposed upper floor to partially heated space Other flat below Ground floor same dwelling below open room-sealed auto-ignition permanent pilot light window roof-window External wall type 1 Alternative wall 1 Alternative wall 2 Roof of Room in Roof gable wall 1. gable wall 2. common wall 1 Only include for RR Type 2. common wall 2 Only include for RR Type 2. database SAP Table Code which indicates an improvement measure for a property. Loft Insulation Flat roof insulation Room-in-roof insulation Cavity wall insulation Party wall insulation Hot water cylinder insulation Draughtproofing Low energy lights Cylinder thermostat Heating controls for wet central heating system Heating controls for warm air system Upgrade boiler, same fuel Biomass boiler Biomass boiler as alternative improvement Biomass room heater with boiler New or replacement fan-assisted storage heaters New or replacement high heat retention storage heaters Replacement warm-air unit Solar water heating Replacement double glazed windows Replacement double glazing units Secondary glazing Solid wall insulation External insulation with cavity wall insulation Condensing oil boiler Change heating to Band A gas condensing boiler (no fuel switch) Change heating to Band A gas condensing boiler (fuel switch) Flue gas heat recovery Photovoltaics Wind turbine (roof mounted) Wind turbine (on mast) Floor insulation; for backwards compatibility only, do not use Insulation of suspended floor Insulation of solid ground floor Insulated doors Instantaneous waste water heat recovery Storage waste water heat recovery Air or ground source heat pump Air or ground source heat pump with underfloor heating Micro-CHP Not recorded 0.04 0.03 0.025 none boiler with radiators or underfloor heating micro-cogeneration heat pump with radiators or underfloor heating heat pump with warm air distribution community heating system electric storage heaters electric underfloor heating warm air system (not heat pump) room heaters other system not recorded Code which indicates the type of terrain. urban suburban rural not recorded Code which indicates the type of conservatory. no conservatory separated unheated conservatory separated heated conservatory not separated not recorded - this is for backwards compatibility only and should not be used Code which indicates the type of floor construction. unknown solid suspended timber suspended (not timber) basement floor Code which indicates whether a pressure test has been done, or whether an assumed value is used. no test, SAP algorithm used yes - measured at 50 Pa yes - measured at 4 Pa RR1 Type RR2 Type unknown as built retro-fitted Enumerations 3, 4, 5, 6 and NI relate to insulation of the roof other than of flat ceilings of the roof rooms. When enumerations 2, 3, 4, 5, 6 or NI apply, Roof-Insulation-Thickness must be included to indicate the insulation of flat ceilings of roof rooms. insulation thickness unknown not determined as built (applies to whole roof room) unknown none; for backwards compatibility only, do not use flat ceiling only all elements 50mm all elements 100mm all elements 150mm all elements as built Code which indicates a particular low or zero carbon energy source. Biomass main heating Biomass community heating Biomass community heating for some of heat generation Biomass secondary heating Geothermal heat source Community combined heat and power Ground source heat pump Water source heat pump Air source heat pump Solar water heating Solar photovoltaics Wind turbine Community heat pump Hydro-electric generation Micro-CHP Exhaust air heat pump Solar-assisted heat pump SAP 2005 version 9.80, dated October 2005 SAP version 9.81, dated January 2008 SAP version 9.82, dated Jun 2008 SAP version 9.83, dated Jun 2009 SAP version 9.90, dated March 2010 SAP version 9.91, dated January 2012 SAP version 9.92, dated Oct 2013 SAP version 9.93, dated Jun 2017 SAP version 9.94, dated Feb 2019 SAP version 10.2, dated April 2023 Codes which indicates where a flat is located within a building. basement ground floor mid floor top floor for backward compatibility only, do not use. insulation thickness unknown as built 12mm 25mm 50mm 75mm 100mm 125mm 125mm 150mm 175mm 200mm 225mm 250mm 270mm 300mm 350mm 400+mm insulation thickness unknown as built 12mm 25mm 50mm 75mm 100mm 125mm 125mm 150mm 175mm 200mm 225mm 250mm 270mm 300mm 350mm 400+mm insulation thickness unknown as built Code which indicates the compass direction. Like SAP-OrientationCode, but without the "unknown" and "horizontal" options. North North East East South East South South West West North West To be used when the pitch is horizontal Code which indicates the vertical pitch (angle). horizontal 30 degrees 45 degrees 60 degrees vertical Code which indicates the amount of solar collector overshading. none or very little modest significant heavy severe manufacturer data BFRC data Code which indicates the compass direction. unknown or unspecified North North East East South East South South West West North West Horizontal (windows and roof windows only) unknown 10 mm 25 mm 50 mm 75 mm 100 mm 125 mm 150 mm 175 mm 200mm if wall insulation thickness is provided with precise measurement unknown 25mm 50mm 75mm 100mm 125mm 150mm 175mm 200mm unknown electrically powered PV powered Extension of a Decimal value for use with monetary values where a currency code needs to be specified. The currency code is actually metadata about the value so, in line with good XML practice, the Currency Code is declared as an XML-Attribute of the Money datatype rather than as a separate XML-Element. The currency attribute should then include a list of valid currencies codes that are supported. A count of the number of occurrences of something - must therefore be >=0. This is the functional equivalent of the XML nonNegativeInteger datatype. A measurement of something such as a length or area. All measurements are to 2 decimal places and must be positive. A string containing a unique identifier for something. The underlying assumption is that each instance of a class or entity will have a unique identifier assigned to it which can then be assigned to any referencing entity as a reference to the entity instance. This is a very similar concept to XML ID datatype but is locally defined because of the need to extend the datatype with domain specific attributes. The Boolean datatype is a redefinition of the XML Schema defined "Boolean". The XSD version is a logical True / False datatype whereas from a data processing perspective it is more likely to be a string based Y/N value. This could be seen as an Enumerated Domain but "Boolean" is so common that it makes more sense to be a base datatype. Yes No An extended boolean type that also allows 'unknown' as a value. English Welsh Identifies the language that the sentence is recorded in. Types of roof that a Property may have. None Flat Pitched. This is retained for backwards compatibility only and should not be used. A pitched roof should be 4, 5, 6 or 8 Another dwelling above Pitched (slates or tiles), access to loft Pitched (slates or tiles), no access to loft Pitched (thatch) Same dwelling above Pitched roof with sloping ceiling Non residential/unheated space Not recorded Basement Ground 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th 15th 16th 17th 18th 19th 20th 21st or above stone (granite or whinstone) stone (sandstone or limestone) solid brick cavity timber frame basement wall curtain wall system built cob wall park home wall Internal External House Bungalow Flat Maisonette Park home Code which indicates the type of heating fuel, as defined in SAP table 12. To be used only when there is no heating/hot-water system or data is from a community network mains gas - this is for backwards compatibility only and should not be used LPG - this is for backwards compatibility only and should not be used bottled LPG oil - this is for backwards compatibility only and should not be used anthracite wood logs bulk wood pellets wood chips dual fuel - mineral + wood electricity - this is for backwards compatibility only and should not be used waste combustion - this is for backwards compatibility only and should not be used biomass - this is for backwards compatibility only and should not be used biogas - landfill - this is for backwards compatibility only and should not be used house coal - this is for backwards compatibility only and should not be used smokeless coal wood pellets in bags for secondary heating LPG special condition B30K (not community) bioethanol mains gas (community) LPG (community) oil (community) B30D (community) coal (community) electricity (community) mains gas (not community) LPG (not community) oil (not community) electricity (not community) waste combustion (community) biomass (community) biogas (community) house coal (not community) biodiesel from any biomass source biodiesel from used cooking oil only biodiesel from vegetable oil only (not community) appliances able to use mineral oil or liquid biofuel biogas (not community) heat from boilers that can use mineral oil or biodiesel (community) heat from boilers using biodiesel from any biomass source (community) biodiesel from vegetable oil only (community) from heat network data (community) boiler community heating storage heaters warm air heat pump - wet system heat pump - dry system electric ceiling heating electric underfloor heating room heater Code which indicates the type of heating distribution system. calculated unknown Two adjoining dwellings Code which indicates the CHP Electricity generation option (table 12f). New CHP, export only. New CHP, flexible operation. New CHP, standard. Existing CHP (2015+), export only. Existing CHP (2015+), flexible operation. Existing CHP (2015+),standard. Existing CHP (pre-2015), export only. Existing CHP (pre-2015), flexible operation. Existing CHP (pre-2015), standard. unknown over 45°C over 35°C and less than or equal to 45°C less than or equal to 35°C not applicable for the heating system unknown boilers CHP and boilers heat pump unknown 2012 or earlier 2013 or later not applicable (FGHRS or no PV) not connected to dwelling’s electricity meter connected to dwelling’s electricity meter not recorded; for backwards compatibility only, do not use unknown – for backward compatibility only, do not use non-electric shower(s) only electric shower(s) only both electric and non-electric showers no shower none Instantaneous WWHRS 1 Instantaneous WWHRS 2 Storage WWHRS space and water heating space heating only water heating only unable to determine solid masonry, timber frame or system built cavity masonry, unfilled cavity masonry, filled cavity masonry, filled and sealed not applicable (detached property or no party wall in this building part) no information - pre-9.92 survey 6mm 12mm 16mm or more mains gas available in the property mains gas not available in the property not recorded; for backwards compatibility only, do not use Confirm a check for the existence of an EPC before carrying out another energy assessment not recorded; for backwards compatibility only, do not use A previous EPC exists A previous EPC does not exist not recorded; for backwards compatibility only, do not use EPC has expired Building fabric and/or services has changed since the last EPC assessment and a new EPC has been commissioned for that building Assessor instructed to produce a new EPC upon request from building owner/tenant/landlord after confirming to the requestor that a valid EPC already exists Duplicate EPC produced by systematic or human error Replacement of an erroneous EPC where the original EPC has been marked 'not for issue' Replacement of an erroneous EPC where the original EPC has not been marked 'not for issue' Green Deal Advice Report: existing EPC pre-dates 1 April 2012 Green Deal Advice Report: previous EPC is inaccurate Renewable Heat Incentive (RHI): existing EPC is more than 24 months old on the date of RHI application Feed-In-Tariff: householder has chosen to undertake energy efficiency measures to improve the previous EPC rating before installing solar panels and applying for FITs Rental purposes: existing EPC is more than 10 years old or is below an E rating A valid EPC is required to demonstrate that the building has an EPC rating of E, F or G to determine if the householder is eligible for Energy Company Obligation scheme measures A valid EPC is required to demonstrate that the building has an EPC rating of D to determine if the householder is eligible for Energy Company Obligation scheme innovation measures A valid EPC is required to demonstrate that the building has an EPC rating of E, F or G to determine if the social housing tenant is eligible for the Energy Company Obligation scheme First Time Central Heating measures A valid EPC less than 12 weeks old is needed to support production of a Home Report for the marketed sale of the dwelling