Can't build floors in certain rooms in Sims Mobile

[planker2000]

Please help me, I can't build any type of flooring in certain rooms of my house. Am I doing something wrong or is it a glitch?

[chippich]

Hi ..I'm new to sims4..I hope you figured it out, and I was hoping you can answer a question for me.

How do I recover the floor after accidentally deleting it? 

I didnt noticed I had till well after I had drawn a bunch of stuff so I didnt know how far back I deleted the floors and didnt want to back track and lose everything else...please help

Thanks