Ok you need 220 cc (construction coins) then you go to the house you want to add the second floor to go to the furniture store thing then click on the house button then click on the house click the check mark yes and if you wanna add stairs click on the button where it takes you to the second floor then click on the add room button while on the second floor then after you add the rooms click on the button that takes you down one floor then you're stairs cost at least 10 cc so go get that then go back to that house go to the first floor then add your stairs where ever it doesnt say red, it wont say red if you put it under the rooms you just built on the second floor!. We build our dream house with unlimited simoleons and in-game currency in The Sims Mobile at Gamescom 2017, and share more about the game! SIMS MOBILE . The sims mobile guide how to move furniture end party level up fast improve lifestyle tips i think the selection of objects is very limited but worst part that you .