Stepping up to the "Platinum" IMAX home theatre for about $1 million gets you a much larger screening room with space for up to 40 people.
According to Hanley Wood and their "Remodeling" magazine the average home theater addition in a new room added to the home, finished with drywall, functional doors and windows, and soundproofing will cost $82,756 (16 foot by 25 foot room). The resale value of this update would hold at $54,051, or a roughly 65% return on investment.
The above figures place the home theater addition at $207 per square foot. This pricing structure assumes that carpenters charge an average of $70 per hour, electricians between $65 to $85 per hour, and painters between $20 and $35 per hour.
Elegant home theater systems has a range of prices for different levels of home theater.
For a dedicated Private Home Theater or Cinema using high end professional equipment, including construction of a rear seating stage and a front speaker wall designed to conceal speakers, acoustical wall panels on all walls, remote lighting control, AV equipment rack installed in wall, RF remote control system, audio and video calibration, all labor and training of your family to us the theater.
For a Media Room the cost starts at $13,000 (No Acoustical Panels or Seating Stage)
For a Private Home Theater the cost starts at $30,000
For a Private Cinema the cost starts at $40,000
(16W x 20L x 9H room examples)
Houzz.com has various home theater designs.