You created value when you made the room suitable for someone else’s use rather than your own.

The "Value" of the room was created when it was constructed and taxed. The "additional value" of a remodel will be reflected in the tax statements and property value (which is usually a return when sold). The room always had value, just not as a business asset which you want. These comments and the ones below are some of the craziest mental gymnastics I've seen this year. "but the landlord is my hero and stopped me from freezing by charging me 150% on the only place I can afford because all the real mean landlords took all the other houses". It's a scam, a con. A lord and serf arrangement carried on through centuries of oppression. It's a grift, has been since it's inception. Which came first, a house or a landlord? Which one was necessary and which one was created with excess capital that was distributed unequally?