anxiousmom-my parents feel the same.
They've discussed their only redecorating plans (getting a smaller desk...my queen-sized hand-me-down bed takes up a lot of the space in my room and I won't need the extra desk space anymore) with me and gotten my approval, and I doubt that they'll change anything else without talking to me first.
I have a cousin that is having trouble standing on her own two feet, and my dad suggested she move into my room when I leave. My mom FLIPPED and goes, "D needs her room when she comes home! She is NOT sleeping on the couch!" It was great.