Planning Advice Note 1/2020: Assessing the extent of the 5 year supply of effective housing land
To calculate the 5 year supply of effective housing land required, the housing land requirement set out in the adopted development plan should be divided by the plan projection period (i.e. the plan period) (years), in order to identify an annual figure.
This annual figure should then be multiplied by 5.
5 year supply of effective land requirement = (development plan housing land requirement / plan period) x 5
This figure should then be compared with the 5 year supply of effective housing land, based on information collected as part of the housing land audit process, to establish whether or not there is a shortfall or surplus.