These are the specific data-items collected by the HI / EA needed to perform the SAP calculation. The building type of the Property e.g. Detached, Semi-Detached, Terrace etc. Together with the Property Type, the Build Form produces a structured description of the property. The estimated banded range (e.g. 0% - 10%) of the total glazed area of the Property that is double glazed. If double glazing is installed then identifies approximately when the double glazing was installed. The number of extensions added to the house. Ranged estimate of the total glazed area of the Habitable Area. Count of the number of habitable rooms within the property. This is the number of Reception Rooms (including Living Rooms, Sitting Rooms, Dining Rooms), Bedrooms, Study and similar rooms but excludes hall, stairs, kitchen, utility rooms, bathrooms, cloakrooms, en-suites and similar rooms. The numbewr of heated rooms in the property if more than half of the abitable rooms are not heated. The percentage of low energy lighting present in the property as a percentage of the total fixed lights in the property. 0% indicates that no low-energy lighting is present. Indicates the type of measurements taken to calculate floor areas e.g. "Internal" or "External" The number of Open Fireplaces in the Property. An Open Fireplace is a fireplace that still allows air to pass between the inside of the Property and the outside. Percentage of photovoltaic area as a percentage of total roof area. 0% indicates that a Photovoltaic Supply is not present in the property. Describes the type of property such as House, Flat, Mansion, Maisonette etc. This is actually the type differentiator for Property but only a limited number of property types, notably Apartment and Apartment Block, have any specific characteristics and warrant their own definition. Indicates whether the heating in the Property is solar powered. Identifies the type of mechanical ventilation the property has. This is required for the RdSAP calculation. Various measurements for each floor that makes up a particular Build-Part. The estimate total heat loss perimeter for the Storey. The heat loss perimeter is any part of the storey that is exposed to the outside world through which heat may escape. Average height of the Storey The total floor area of the storey Structured type for recording the details of the main heating present in nthe property as used in the SAP calculation Details of the significant building parts that comprise the main habitable building in the property. The main habitable area generally consists of a single main building but can over time be extended to include extensions such as new wings and additional storeys. For the purpose of calculating the overall Energy Assessment for the property details of each distinct Building Part, such as its construction, have to be gathered because different materials have different insulation ratings (obviously) which affects the overall rating. A permanent structure that forms part of the Property and is built primarily for human habitation. A Building is usually made up of one or more Storey's and may contain a number of Internal Structural Features. An extension would be a Building Part. Identifier for the Building part - generally only required if there are more that one Building Parts of the same type e.g. "West Wing" and "East Wing" Extensions The value represents the year the property was constructed. Describes the type of insulation present in the wall if any. Describes the material that the roof of the Building Part is constructed from e.g. Tile, Slate etc. The location of the insulation in the roof e.g. between joists, in rafters etc. Average thickness range of the insulation e.g. "100 - 125", "200 - 225" etc. Details of the windows in the building Classifies the type of construction for the Wall e.g. stud-partition, brick etc. Details of the main Electricity supply to the Property. The type of Electricity Meter - taken from a pre-defined list of values. Additional record of Energy Source - selected if Gas Details of the means by which the Main Building is heated. The secondary type of fuel used to power the central heating e.g. Gas, Electricity The type of fuel used to power the central heating e.g. Gas, Electricity The type of fuel used to heat the water e.g. Gas, Electricity Type of Main Control for the Heating System. Type of secondary heating (if any) present in the property. Describes the type of Water Heating present in the Property. The size of the Hot Water Cylinder - taken from a range of standard sizes. the type of insulation surrounding the Hot Water Cylinder Average thickness of the insulation surrounding the Hot Water Cylinder. The type of thermostat installed for the hot water cylinder Indicates the flue type of the heating system. Indicates whether the heating system contains a fan flue. This is required by RdSAP and should be part of the 3-letter codes but isn't. Identifies the means by which the central heating system (if present) emits heat. A conservatory intergrated into the property that is within the heat-loss perimeter and forms part of the habitable area. Indicates whether the conservatory is double glazed The gross floor area of the conservatory The length of the glazed area The average height of the conservatory Identifies the storey within the block that the entrance to the flat is located on The number of Storeys in the Apartment Block. Indicates that the Apartment is located on the Top Storey of the Apartment Block. Indiocates that the flat contained a cossidor through which heat is lost. The tortal length of unheated corridor in the flat. Only popualted if Heat-Loss-Corridor = {Unheated Corridor} Identifies the type of foor through which heat loss occurs.