According to :
The bottom line is that there is usually almost nothing you can do to increase
the sale price of a house enough to offset the cost of the work. All you can
really do is make it easier to sell.

I've been told that, aside from cleaning/painting existing stuff, about
the only larger-ticket items that can possibly have a return-on-investment
are landscaping and certain mostly-cosmetic upgrades in bathrooms.

Certain _not_ pools, kitchens, or finishing basements.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.