Expand square footage - rent later?

[Kevin Jorgensen]

Hello I've been away playing the crypto market for fun but am now back with a new question. My home currently would sell for ~225-250/sqft But it doesn't really pay to be a landlord where I'm at (Beaverton, OR). Instead of selling and buying a new home, i recently am considering expanding the sqft of my home (over the garage / in the crawl space). Depending on the crawl space in looking at a 20 to 40% increase in sqft......as I see it, as long as the total construction costs are less than 225/sqft I add instant equity....am I wrong? I figure that since I'm not expanding the foundation of the home then costs shouldn't be a nightmare. But I'm inexperienced here. Plan would then be to hold the house as primary until a later date when using it as a rental made better financial sense. In the meantime I could put other after tax investment cash into crowdsourced REI. Thoughts?