It depends on how you fix it. If it is economical and practical, it will cost about180,000 to build three two-and-a-half-story rooms without doors and windows. Three small rooms, depending on the size, one room is about 10 thousand. As for the seismic column, it is definitely necessary, depending on the economic situation. You'd better find someone who knows the design and will supervise it for you, so you can save a lot of money.