28/03/2016
Property Value Addition
Extra Bathroom = 4.9%
10% Extra Floor Area = 5.1%
Extension or Loft Conversion = 22%
https://uk.finance.yahoo.com/news/home-extension-loft-conversion-add-060006670.html
Extending your home or adding a loft conversion can add more than £42,000 to the value of an average property, while an extra bathroom could boost its worth by nearly £10,000, a report has found.