Yes there would be coverage. It would either be covered under Dwelling or Other structures depending weather the garage is attached to the house or not.
Review your other structures to confirm that you have enough coverage. Examples of other structures include your fence, garage, shed, gazebo, barn, & possibly your pool.
Your personal property would also be covered if damaged, as a result of the collapse.
You may not be covered by your homeowners policy if the garage is used for business. In this case you would need commercial coverage for the building and property. We handle both types of insurance. Should you need more information we are only a call away.