This guide will show you how to have more builders running around your settlement.
Simply press the P key on your keyboard. This will bring up the “Professions” screen. Here you can manage your citizens professions.
Before you increase the number of builders, I suggest you have enough laborers to spare.
Once you have a few laborers to spare, on the top right corner of the “Professions” screen you will see the “Builders” bar.
To increase the number of active builders, just press the + button.
That is all.