This is Results of a survey conducted by 100Agent  real estate in the United Kingdom found 10 Value added of most common home improvements.
1) Loft Conversions – £ 22,000
Two) New Expansion – 19,000 GBP
3) New kitchen set – £ 10,000
4) New Conservatory – £ 9,000
5) New Windows – £ 6,000
6) Central Heating – £ 5,000
7) [...]