We are currently using Posh, and I am looking for alternatives.

He has given me a line item quote that includes phasing, budget for materials, etc.

What's the alternative? 

In my area not including paint that's about a $5k job including materials.

Alternatively, you could DM him.

Before we go full in house, we are really trying to dial in the quoting process, specifically with putting material lists together.

Since you're not planning to remove the stair or lay down carpet, your focus should be on closing off air gaps, adding dense materials to block airborne sound, and absorbing reverberations inside the stairwell.One of the most effective ways to reduce airborne sound is to add mass and sealing to the underside of the staircase.

Are there any alternatives to review?

For investors or homeowners building to rent, it’s a great alternative to conventional financing—especially when traditional banks decline due to asset type or age.If your goal is to rent out the ADU, we could structure it as:A short-term bridge loan during constructionThen refi into a 30-year DSCR loan once it's complete and rentedThis way you get both the construction funding and a permanent loan without going through a full doc conventional process.Happy to run the numbers if you'd like to see what leverage or rate options might look like.

In CA an unlicensed handyman can only do $1000 (labor & materials)Only a licensed c39 contractor can do roofing and must carry workers comp insurance on himself and employees.