HEAT LOSS If the conservatory is not heated from the main heating system or it has an external quality door fitted i.e. double glazed patio or similar then it should be ignored and not included in the RdSAP, then the heat loss perimeter will be measured straight across the wall were the conservatory is located. If the conservatory is heated from the main heating and has not got an external grade door then the heat loss perimeter will be measured around the outside walls of the conservatory.

CONSERVATORIES To be classed as a conservatory 75% of the roof must be glazed or have a translucent type sheeting and 50% of the walls must be glazed. If the structure does not meet this criteria then it is not a conservatory for RdSAP purposes.

FLOOR AREA If the conservatory is to be included in the RdSAP then the floor area will have to be measured and the measurements included within for the ground floor calculations.

Measuring the height of a conservatory The height of a conservatory is measured in stories from 1-3

1 storey height

1 ½ stories high

2 stories high

2 ½ stories high

3 stories high

ALTERNATIVE WALLS. An alternative wall is an area of the property wall that is thermally different to either the main property or any extension’s. RdSAP recognizes 7 types of walls. Stone, granite or whinestone. Sandstone. Solid brick. Cavity. Timber frame. System built. Cob wall

ALTERNATIVE WALLS To be included in the calculations for RdSAP the area of construction of an alternative wall must be a minimum of 10% off the total area of the building.

Alternative walls Granite Cob wall Timber frame sandstone

Room in a roof For the purpose of RdSAP The rooms must be accessed from a fixed stair case and heated from the main heating system of the property. When measuring properties that have had rooms built in loft space, the height of the intersection of the wall and the roof is the measurement that will determine if the space is a loft conversion or a room in a roof.

Loft conversions. To be classed as a loft conversion the height at the intersection of the wall and roof must be a minimum of 1.8m. If the measurement is 1.8m or above then the floor area along with the heat loss perimeter will have to be calculated for this property.

Loft conversion Height at intersection is higher than 1.8m.

Dormer roof

Room in a roof To be classed as a room in a roof the height at the intersection of the wall and roof must be a maximum of 1.5m if this is the case then only the floor area will have to be calculated.

Room in a roof. Height at intersection is lower than 1.5m.