Would changing all floors in a property be worth it financially?

[Dale Viljoen]

I have been doing a lot of property scouting and found a area that I believe would be great for capital growth. However, a few of the houses I am looking at have really bad floors: 

Would it financially make sense to change those to tiles (raises the houses value more then the cost of installation and materials) or would it be better of leaving them?

All help is appreciated as always, I believe many more questions are to come :)