Please could anyone with knoweledge (sure many have had the experience) give me some pointers as to where I can get info on what to look out for to add an extra room above garage to a 3 bedroom detached house. Basically any advice on what procedures will have to be followed, tips on selecting good building companies etc. Also (if I can manage to talk my way into it) tips on having this room made into a good setup for a front projection setup (panasonic ae300 maybe). Already have 5.1m mission cinema 7 with kef sub. Thanks.