. $2-4 per sf.Rigid Core Vinyl: This material is available in SPC (stone polymer composite) and WPC (wood polymer composite) types.

A builder’s risk policy is also worth exploring, as it can protect the property, materials, and equipment during your restoration work. 

Quote from @Davin Manfredi: This is a construction material on the remodel or work done on the home, so I would say it would fall on you.

Ask them to explain.2) They should provide you with the materials receipt, which you'll need for the warranty!

Quote from @Conrad Tillman: Quote from @Jay Hinrichs: LOL  its kind of like 50 ways to leave your lover.And its very much dependent on your jurisdiction. however I will list the stuff I have gone through the last decade or so through about 200 new builds in 4 markets.1. material price fluctuations. rarely down almost always up pretty much annually. 2. as we all know labor  scarce  and or unqualified and do poor work..

I reported someone sometime back that was blatantly self promoting and using fake account to ask a question so they can answer it with their service pitch.

Leverage the Airbnb new listing promotional feature. 

If you will be purchasing materials those cards offer some discounts and in addition you can get pro discounted pricing on larger orders as well.

3- what is the cost of materials?

This will result in inspection results that more accurately indicate property conditions and promote better living conditions for residents.