Some IDs really go the extra mile! Apart from the usual design stuff, mine helped me select furniture, even managed to get some custom pieces to fit my tiny 3-room HDB perfectly.
They also did provided a virtual layout to see how everything fits before buying. Cost-wise, got a bit of markup as they are considered more premium kind of ID, but worth it for the hassle-free experience. No harm asking your ID if they offer these extra services.