I start my reno before the lunar 7th month and will end during early part of the month. My father already grumble a lot on this. But I feel that reno start before 7th month and end during that month is ok lah. After all during the building of the flat, it already gone through a few 7th months. Just don't shift in during the 7th month especially if you are going to bring in God and ancestor. Btw, I wander should we pray a bit at the new house even we have not shift in yet?