You could hire an appraiser to do a desktop appraisal of the after construction value. (biggerpockets.com)
The location, age and value of your house as well as the building materials used in its construction (trustedchoice.com)
Construction value added represents 7.4 % of all value added, a concept used to establish the total size of the economy, avoiding counting the inputs into the construction process from other sectors such as manufacturing, real estate, etc.. (politics.co.uk)