The question, asked by the hon. Gentleman is unclear in terms of what model is being referred to. No econometric model of housing stock conditions along the lines of the Treasury model is held by the Department.
The single transfer model (STM) and building cost model (BCM) are accessible to local authorities and used by them to model their assumptions about the value of the stock based on estimates of expenditure on repairs and improvements that need to be carried out over a 30 year period. Local authorities submit these models to the Department as part of either a large scale voluntary transfer or arms length management organisation application respectively.
If the hon. Gentleman is referring to a model of housing stock conditions held by the Department, the condition of the housing stock is monitored through the English House Condition Survey and from social landlords’ own estimates provided through their statistical returns. The English House Condition Survey data collection methods, along with the information on how it is compiled to report results, are published along with the data itself on an annual basis.