Does the executor have sole decision capabilities when agreeing on the sale price of an estate?

Question

or do the beneficiaries have any say in the decision?

Answer 1

The executor's obligation is to get the best price for any sizeable properties to be sold.  In the case of real estate, that usually means obtaining a professional appraisal & then listing the property for least that amount.    If ALL the beneficiaries agree to sell for less or waive an appraisal they may do so.

Answer 2

The beneficiaries should have a say, because they are the ones who are directly involved and they stand to benefit or lose the most.  The executor is only an overseerer, to see that things get done.