In real estate, you typically are able to access homes that are listed for sale. That's not always the case, however.
There are 4 types of homes where a buyer wouldn't be able to perform a showing prior to an offer on a regular basis:
Buyer Unavailable Before Offer Deadline
Buyer Unavailable Within Narrow Timeframe
Agent Unavailable for Showing
Showings Only After Contract Ratification
Showings Only After Closing
What to do when a home won't allow showings or when a showing is unfeasible:
The answer to this question depends highly on the scenario (i.e. 1-4 above) and the buyer.
Determine if there's any option for showing.
Determine your risk tolerance.
Can you get an appraisal?
Further assessments
Perform heavy online research
Use a buyer's agent with gadgets for imagery, especially a drone.
Know the state law on right of rescission period.
Where do you find homes that don't allow showings?
Related: