Hi Shiftcontrol,
We've been to the Tucan and loved our vacation there. I'm sure you will too. By the way, we were in room 1142 and loved the location.
To answer your question, we were at the sister IB* Paraiso del Mar/Beach in 2003 when they were building the Lindo next door. And we were at the Barceló in 2005 when they were building the Colonial/Tropical and earlier this year when they were building the Palace
The construction never bothered us during any of those vacations. Yes, we heard the odd noise, but it was never very loud or for very long. I think you will be surprised at how little you will notice.
By the way, I have pictures from the Tucan/Quetzal in my galleries at the link below if you are interested.
Hope this helps