The cost of this wall is under $6.00/sqft including labor.
The acoustic ratings of individual materials cannot be added to existing walls. No special training or labor is required, since it installs just like drywall. Labor is about $0.60/sqft. Vinyl installation is labor intensive. Resilient channels is also an older soundproofing technique, dating back to 1963. The addition of a vinyl layer does little to change this since the outer gypsum will be nailed or screwed directly through the vinyl into the stud. Room-to-room noise reduction is rated in terms of sound transmission class (STC). As are soundproof drywall tests (on the Quiet Solution site). Low cost soundproof drywall today runs about $1.20/sqft (and is available at local dealers). If one is not doing the work themselves, subcontractors charge $1.00 to $2.10 per square foot for installation. This is considered poor, as conversation can be easily heard.