Apply Multiple Builder Resources to 1 building project

Would this be possible? say you have 2-3 builders and you're upgrading higher level buildings which take around a week, apply more than 1 builder and get a larger discount on the time spent to upgrade. the only accelerate options at present involve spending lots of gold balls
Was hoping this was the case when I went from 1 builder to 2/3 builders, brilliant idea when your levels isn't maxes