That's exactly what the government is working on right now. Do your homework before chiming in: http://business.financialpost.com/personal-finance/mortgages-real-estate/massive-effort-underway-to-create-database-that-will-shed-light-on-canadas-housing-market/wcm/7b6aff4d-0bff-4223-a2cc-bc0207ff9e89