hi
the reason i didnt block up the garage door was that I wanted a fully darkrned room as this si to be nothing but a cinema room.
Also from the outside my house still looks the same with the 2 garage doors etc and I wanted a fixed screen with velvet curtains each side, an old type of cinema .
With regards to building regs, not that hard really but im a building surveyor so easier for me than most.
Basically you need to produce the drawings and submit to your local authority for there approval. You have to meet the new insualatioon requirements of the building regs, for me it meant using rockwool flexi bats at 100mm thick, 250mm of insualtion in the loft and 75mm in the floating floor

I used a company called lafarge for the boarding, and rockwooll for most of the insulation.
But id advise anybody thats going to spend a large chunk of cash to go down this route, if you do not and you say have a fire or get burgled then youll only be insured as a garage with the standardish £1000 worth of cover, which wouldnt pay for 1/2 me projector let alone the rest of the av gear.
Also if you sell you have a habitable room to sell with the house, cricky who parks there car in the garage anyhows.
On the progress front painted the walls tonight a deep red colour and put on the first coat of screen goo, starting to look really good now
8 days until AV install so need to keep the pressure on, having the ballanced inline fan scheme installed next week, ballances intake and exhaust and its acoustic ducts as well should be nice as it'll be well stuffy otherwise without a window