Cost of Building an Accessory Dwelling Unit - ADU in Los Angeles

[David W.]

I am seeing that businesses are quoting approx $150 to $160 per sqft and $170 per sqft for bathroom/kitchen areas. I would LOVE to be a part of building it (I have re roofed, general plumbing repairs, drywall etc) to offset the cost.

Can someone point me in the right direction? How do I lower the cost as I was hoping to do a 1000 sqft inlaw aka ADU 1 bed 1 bath in the back of my house (yes I have the space) as an additional source of income for $50k-$60k. I would literally build it myself if I knew how.

Thank you!

David