If your home is vacant more than 30 days - with the exception of seasonal & secondary residences - regular homeowners policies will not extend coverage. A common circumstance we see often is when a family home in inherited. Until the home is sold or occupied, it would need a special policy to accommodate the vacancy status.
Vacant policies will cover the structure and liability coverages and can be written for short term or long term in 1 month increments up to 12 months.
Worried you aren’t completely covered? Consider an umbrella insurance policy that extends your coverage.