I don't see why not? As you said, its a starting point, at least. I'm not sure I would use TS4 as a "base", though. As has been said, its restrictive and also quite limited when it comes to colours and patterns. I'd use TS3 instead, where you actually CAN create your own patterns in any colours. Like if you have a specific wallpaper in mind for your new home, you can just add it. Sure, its not like in real life, but it will at least show the designer/architect/builder what you are after.
Of course, you'd need technical drawings/floorplan as well.
