Support and Resources for the Domestic Energy Advisor

Occasionally the energy assessor may find that the dwelling being assessed has two or more different ceiling heights, and these should be averaged for the RdSAP data entry.

If you consider that the dwelling is equally divided then you may make a simple calculation to determine the average ceiling heights.

On occasion, however,the dwelling ,may have ‘add-ons’ for example, with different ceiling heights that make it impossible to accurately determine the average height using a simple calculation and here we can help.

The floor plans below help to describe the situation that you may be faced with.

This1910 property was built with an attached ‘out-house’ and later extended to form a new bathroom and utility area.
Although we can assess the bathroom and utility areas as an extension under RdSAP, the existing ‘out-house’ should be included in the data for the main dwelling.

Unfortunately for the assessor, on the ground floor the main ceiling height is measured as 2.400m and the ‘out-house’ ceiling height is measured as 2.120m. Therefore a more detailed calculation should be processed.

The data we require for this calculation is as below:

Rooms

FloorAreas

CeilingHeights

Volume

A

B

C

D( B x C )

E

F( D x E )

Living area

4.490

7.080

31.789

2.400

76.294

Kitchen

2.300

2.760

6.348

2.120

13.458

Totals

38.137

89.752

Average Ceiling Height ( F / D )

2.353

The calculator will let you make the necessary data entries and present you with the corrected average ceiling height. There is the option for three separated areas, but if you only use two ( which is probably the norm ), just place a ‘0’ in the remaining boxes.