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"House Rebuilding Cost Assessments for Insurance Purposes

Most domestic house insurance policies require that the sum assured
is the full rebuilding cost of the property. It is the responsibility
of the insured to get this figure right. BCIS is commissioned by the
Association of British Insurers (ABI) to provide guidance figures for
the rebuilding cost of a home. The information in this section gives
a general indication of rebuilding costs for many common properties
within the UK, but it should be noted that it is not appropriate for
all houses."

http://www.bcis.co.uk/costass.html