in a stick frame market and one of the cheapest markets to build we build with margin at $190 or so a square foot. that will go up over time about 5% or 10% a year to keep up with new build price increases. we are buidling a 3 story walk up and source some of the lowest priced crews.

Having a person answer the phone costs the PM company substantially more than operating a support button with a delayed response.

Hi there,I'm trying to determine the best way to live in and eventually acquire a property as an inheritance while maximizing cost-effectiveness.

Debt is not only the easiest to originate but also recognized as the  cheapest form of capital.

Plans for what you're building will be key - it's too vague and open right now for someone to advise you on potential cost. 

Perform a cost seg study on JUST the ADU.

Can you speak on how you source granite slabs cost effectively?

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!

Here's an article with additional FAQs on cost segregation studies that you may find helpful.

The big issue is building a single small residential unit is the most expensive residential development.Here is a list of why adding a single ADU in single family zoned areas in my CA market is typically a poor RE investment:1) The value added by the ADU addition is often significantly less than the cost of adding the ADU.