Hi Sarah_1′
Normally the Builder would remove any furniture, pots etc needed to do the work. However maybe the Builder on viewing the site wrote in the quote that all furniture etc needed to be removed?
The bottom line is that the OC would have the right to request that you temporally remove the furniture, pots etc that you may own. The rest which I assume belongs to the unit Owner is up to them to remove.
Keep a balance approach on this as its to your benefit to have the repairs done. Give the Agent a call or talk to your EC committee members, a team approach would seem to be the answer to me.