Here you'll find some details on building effects.
It brings food everyday. As all mushrooms chambers are neat and tidy on Antzzz, there's no risk for your anthill ;)
Improves carrying capacity by 1% for robberies and 5% for trade per level.
Improves experience gained from a fight by 10% per level.
Speeds up the laying by 10% for each level
Give access to researches.
Reduces by 10% research times for each level
Unlock more powerful units
They give you defense bonus when you're attacked.
Dome bonus : 10% + 5% for each level.
Nest bonus : 30% + 15% for each level.
Each building level gives you 1 point, then add all together.