In the one I’m doing now I’ve demoed a few walls and layed 1/4” over other parts.

Majority of the property is demolished and rebuilt via a partial demo with an Alt-CO filing with DOB.

Basically I got the house demoed, new roof, new gutters, misc. materials and other minor labor completed for $15k.  

I am beginning renovations on a single family home in West Seattle soon, and the demo and trash generated will be pretty extensive.

Dont forget the permit fee, time, and cost of demo and hauling all the material away.

I don't know them but for that price, it's worth checking out a demo I think. https://coachmatix.com/5.

When you get your demos, ask about data sharing and make them be specific.

There is a garage in the back that is not in a good shape, so I am considering demoing it and making it a parking pad.

That being said, if it's not disturbed, you don't need to worry about it (but this will add to the demo costs when you gut / rebuild.

Be sure to ask for very specific scenarios, locations, and property types that you are interested in since their canned demos only show CoStar in its best light and none of its missing holes.