In order to edit the bedroom/bathroom count, square footage, and other home facts, you must first claim ownership of your home's property page. If you have not already claimed your home on Zillow, please follow these steps.
Once you have claimed your home you can select Correct home facts from the More dropdown menu.
The next screen allows you to edit various details including home type, bedroom/bathroom count, and finished square feet.
When you are finished making changes, click the Save Changes button at the bottom of the page.
For information on updating your home's photos, please see How do I add or remove photos of my home?