Housing Density: Any guidance for homeowners who want to build multi family housing on their lot?

Paging housing policy nerds here.

I’m excited to see that new neighborhood residential zoning may allow up to six housing units on previously single family lots.

Does anyone have any guidance for single family homeowners who want to build multi family housing on their lots without selling everything? Or guidance on splitting up the lot?

I’m lucky enough to co-own a place to live in Seattle. It’s a really small and crappy house on a lot larger than we need.

We would like to stay on our land, but have no attachment whatsoever to the house and would love to build multi family housing and just live in one of the units. We’ve always wanted to build a DADU, but are not the kind of people who have $300k laying around to do so, or could handle an extra $5k a month in loan payments on top of our existing mortgage.

Does anyone with more housing policy/ home building experience have funding advice? Is there any hope for us, or is increasing density just a job for major housing developers? I don’t want to sign everything over to developers, but if I did, how would that even happen? How do you engage with them besides just putting your house up for sale?

Details that could help or harm us:

My partner and co-owner of the land is an enrolled tribal citizen and we have a section 184 mortgage.

We would be interested in making at least two of the units affordable housing (though how does designating units affordable even work?)

We are neither low income nor millionaires.