Often times as a sprayfoam insulation contractor, we are asked to provide insulation bids from a set of blueprints. When doing so, I recommend stating that the proposal you are submitting is for budget purposes and is not a binding agreement to perform the insulation services for that price.
Plans often change during the framing process and sometimes things can be missed on a set of plans that are easily visible when you actually walk the project and take measurements.
If you would like to have a third party company take a look at the blueprints and provide you with the complete take off with a detailed description of where the insulation will need to go, how many board feet of material you will need and a suggested sales price, we can provide this for you. Plans can be emailed to our blueprint services partner and a 48 hour turnaround time is given.
This service costs $60 per set of plans and covers plans up to 10,000 square feet. Here is a link to an example of a take off that was performed for us: