Average TER calculation for multiple dwellings in a building

Where a building contains more than one dwelling (such as in a terrace of houses or in a block of flats), an average TER may be calculated for all the dwellings in the building. In such cases, the average TER is the floor area weighted average of all the individual TERs calculated using the following formula – (TER1 x Floor area1) + (TER2 x Floor area2) + … TERav = Floor area1 + Floor area2 + … The area weighted average TER may be compared against the floor area weighted average DER. Block averaging is only permitted for multiple dwellings in the same building. It is not permitted across multiple buildings on the same development.