Create a folder calles "schematics" inside your .minecraft folder, then put the schematic file in it. Ingame type "//load noble_house2" /this will load the schematic) and then "//paste", then you will hopefully stand infront of the door ;-)

Of course you need singleplayer commands for this http://www.minecraftforum.net/topic/94310-166-single-player-commands-v29-1-new-update/

To paste it on a server ask the server admin to put the file in the servers schematic folder