Hi the house is worth 385K and there is no mortgage, the house is owned out right by my mother in law.
He put in some drainage in the garden, a small drive way (which didn't have planning permission and subsequently has had to be put back as a pedestrian pathway). He put new cupboard doors on the kitchen cupboards and installed a shower in the downstairs bathroom. All of which was funded by my mother in law and was carried out over 7 years ago and has since been redone in order to sell the house. He paid rent during the time he lived there which barely covered living expenses.
mum paid for the price of all materials, the drainage was actually put for free by a friend of his that owed a favour. Its hard to estimate a value that has been added to the house as the work was shoddy. The shower probably added a few hundred pounds value at best. The drainage has since been redone again!