Thanks for the quick reply Dennis! Can you elaborate on why? It would help in convincing my wife lol
You are not extending the basement! You are extending the house so the pantry and laundry area will be more functional, convenient, and provide more cabinet/storage space in the house. (Clearly you haven't been married very long nor taken a course in wife negotiations.
There is a long and significant list of acoustical reasons; but, let's focus on wifey reasons.
- 16' wide will accommodate a nice sized screen; but, 16' of depth will not support seating distances for two rows of seats with a "nice sized screen".
- With the short depth, your back row will be against the back wall (bad for acoustics). With recliners your seating platform will force your front row to 10' away from the front wall. With a screen wall, that screen will have to be at least 2' to 3' in front of the front wall putting the screen 7' to 8' away from the front row (your screen width (max) would be 7' to 8' wide). Way too close for a big screen.
- With two rows, the room will look to be "overstuffed", cramped and not at all an inviting space to plop in for two hours.
- You'll have a big 16' wide wall with a dinky white spot in the middle called a screen.
HVAC...make certain your HVAC contractor installs both a supply and return in the room. Don't let them argue with you ... you want, will have either both a supply and return in the room or you will have a different HVAC contractor. Don't let them run duct work below the joists down the middle of the space ... it must be run next to the walls.
Avoid plumbing that will be below the joists...if there is no other choice, it should run adjacent to the walls.
The entry door should not be in the front or rear but on a side wall approximately 1/3rd the length of the wall from the front. If you have no choice but a rear entry, do not put the door in the middle of the back wall.
With only two rows, I (me personally) would not spend the money to increase the ceiling height.