Here I am attaching the floor plan. Look for the bed 2 which i would like to convert into theatre room.

It is probably a bit narrow for a theatre room. The area that will let it down is from a sound perspective. Placement of speakers is crucial to getting the effect of surround sound. Putting it very simply, too close together and the sound will blend in together. Too far apart and you will get a dead spot. If they're not angled appropriately you will get phasing issues which will cancel out certain sounds. For that depth of room, i would probably recommend about 4.5m wide. On a slightly different not, i find the placement of the laundry rather odd. You will get the noise and vibrations from a washing machine/dryer in the two rooms that you probably least want it in. The other consideration you may want to look at is keeping the rooms that have plumbing on the same side of the house or at least as close together as practical. Keeps building costs down.

Hi, Are you going to be concerned about noise attenuation coming from the games / home theatre room to the rest of the house? As solid core doors will work better than hollow core when closed at reducing the sound transmission. Sealing the door frames and adding ceiling baffles will help further but would need to be considered at the design stage not as an after thought. The solid doors by themselves over hollow doors may drop the STC rating by 6 to 8dB which is noticeable. Andrew

I would look at installing the floor to ceiling bookshelves with the television in the same shelving. This shelving to be situated on the left hand wall, when looking at your plans. Another suggestion is to close the gap between the living and tv room in the left hand bottom corner, and have the same bookshelf/television set up along the bottom wall. Chairs and sofas are personal choice. It depends if you want to lie on the lounge or sit in comfortable single chairs with a footrest, then add a sofa for friends and family.