If you dont know im doing the work myself :)

Learn Sketch Up.

Thanks! I've tried it before and i'ts really complicated but theirs many other online places i could learn i just would have to find them ;)

Depending how detailed and extensive this renovation is you may want to try Softplan Studio.

If you don’t have the patience to learn something that isn’t that hard, and that is free, then forget anything else. Hire an actual designer. They can visualize in their heads and don’t need software to fake it.

Thank you! :D